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DM32 manual

1. cccccccseccccsscccceeccccescscenecseeneceeeeeeeeeceeeuecseeueceeeeeees 20 2 6 6 Capture and apply a Baseline using SEttiNgS cccccssccccessecccesseceeceeeceeeeecesseeeceeeeeeeeeeas 20 2 7 Gauge compensates for sensor drift with Auto Zero cececccccccccsseesseeccccceseeeeseseccecesssuaasseeeeeess 20 3 Get Results directly from the SaUge ccsccscscsccsccccsceccscsccccsccscsceccscsseccece 22 3 1 Connect Speed Control Cable between the gauge and fan cccccccssseccccssececeeeseceeeeseceseeeceeeenes 22 3 2 Connect pressure TUDES to Palle eis us assada a OL aC Ad E aa 22 3 3 Control the test and read Results on the Home screen ccccccccsssessseeecececeeaaeseeecceesssaaaeeseeeess 22 3 3 1 Tap Range Device to match Range on Device in USC cccceseeeeceeccesseeeeeeseceeesseeuuueeeeees 22 3 3 2 Tap Range Device gt Change Device to change Device in USC cceeeeseeeeeeseeeeeeeessseeess 22 R33 Tap Set Speed to run the fan at a particular SPCOd cccccccssseccceesececeeeecceeeesecesseneceeeeens 23 3 3 4 Tap Jog keys to adjust speed up or down 5 esssssseeesssresesrresssreresrresssrerssrresssrereserereseerese 23 3 3 5 Tap Set Pressure to achieve a particular enclosure pressure cceccceseseccseceseececeneeeeeness 24 3 3 1 Tap Set Pressure 0 to achieve Zero Flow Hood PreSSUre ccccccssssccssseeeeececeeceeeeeseeuess 25 3 32 Tap Jog keys to adj
2. Equivalent Leakage Area at 10 Pa 42 4 f Pa Equivalent Leakage Area at 10 Pa None Taken 93 sq m x 804 7 Settings CFM 28 cu m A None Taken STOP 5 seconds 1 000 sq ft Pressure Pa 1000 cu ft 5 seconds Flow CFM Figure 46 Tap Settings to change Result being displayed 3 Tap the selected Result continuously to cycle through different units available for the Result Flow normalized by area Flow normalized by Air changes per hour Air changes per ho Equivalent Leakage Area at 10 Pa Equivalent Leakage q Flow normalized by area Aw changes per hou Equivalent Leakage Area Flow normalized by are Air changes per hour Flow normalized by area Equivalent Leakage Are Air changes per hour Equivalent Leakage Area at 10 Pa Figure 47 Change Result units For details on Pressure extrapolation to display the Result a particular pressure see section 2 6 4 Page 42 of 96 Retrotec Inc 2014 4 8 Set up Network if using Ethernet connection 1 From the Home screen tap Settings and then the key to get to the second Settings screen Tap the Network key to enter the Network Settings menu From the Network settings screen tap the Status key to cycle through different connection types available between the gauge and the computer e Disabled neither wired Ethernet nor WiFi network being used e Wired Ethernet cable connected to the gauge
3. Touch the screen to continue NA NANA LA Figure 51 Tap each red dot as they are presented to re calibrate touchscreen If your gauge touchscreen is not responding at all so you cannot navigate to the Settings menu use the DM32 Configurator software to re calibrate the touchscreen see the DM32 Configurator manual 4 11 Reset button If the touchscreen is frozen or your gauge is not functioning as normal you can reset your gauge 1 Use a paperclip to push the Reset button on the bottom of the gauge shown in Figure 3 2 The gauge screen will go blank while the gauge resets itself 3 Once the gauge is reset the splash screen will appear If pushing the Reset button on the gauge fails to reset the gauge try charging the gauge using the AC adapter first since the batteries may be out of power Page 46 of 96 Retrotec Inc 2014 5 Remotely run tests and save results with Retrotec software It is advantageous to connect the gauge to a computer directly or through a network since a computer or other device can be used to control gauge functions and collect measurements using software and save the results for later analysis and reporting Retrotec has a number of software packages designed to remotely run tests and gather results from the testing using your computer and to generate customized reports from the automatically collected data including an App that runs on a mobile phone The following list briefly describes the avai
4. A common term used to describe air flow at a pressure by equating it to an equivalent size hole in an elliptical nozzle that would pass the same air flow at the same test pressure It is usually taken at 4 Pa and incorporates a 1 0 discharge coefficient It is typically about half the size of an equivalent leakage area that describes the same air flow rate See ASTM E779 10 eq 5 effective leakage area The surface bounding a volume which is connected to outdoors directly For example an apartment whose only access to outdoors was through a doorway that leads directly outdoors Or a building with a series of apartments or offices whose only access to the outdoors is through a common hallway then the enclosure would be the volume that bounds all of the apartments or offices Page 94 of 96 Retrotec Inc 2014 E Term Envelope The surfaces composed of floor and walls and floors that separate the test volume from volume surrounding the test volume Also see enclosure In layman s terms the ELA is the size of hole we d have if all the building s cracks and holes could somehow be brought together Also called Whole Room Leakage and includes leaks through the ceiling and below the ceiling BCLA In CA2001 we measure this in units of sq ft or sqm at a reference pressure in Pascals Pa In Engineer s terms the equivalent size of hole required in a flat plate to give the same flow rate having a discharge coefficient of 0 61
5. Firmware version check serial number ceeccceeessceeececeeceeeeeeeeeeeees 44 410 Re calibrat thne touchscreen salsa antir Abade os CUL a Eae 45 ATi Reset DUTON gran ua a E E 46 5 Remotely run tests and save results with Retrotec software cccsscssseeses 47 5 1 Connectine caules to a COMPpULer sue siena ancora si iara dba EE EEE 47 5 2 Connect single gauge to a computer with Ethernet Cable sessssssssesreesreserrrssrersrresrrresrresrrrserreens 47 5 3 Connect multiple gauges to a computer via Wired network ccccccccescccceecsceecsceeceeeeseeeness 49 5 4 Connect computer or phone to the DM32 WiFi Hotspot cess ceeeccceeecceeecsceeeceeeueceeeeeeeeenees 51 5 5 Make the DM32 join an existing WIFI NETWOFK cccccessccccessececcesecceeeeseceeseecesseeeceeseuaeeetanseess 53 5 5 1 Set secure wireless credentials using DM32 Configurator SOftWALEC cccccecsseceeeeeeeeeees 54 5 5 2 On DM32 verify wireless credentials after updating seseseeseensesserssrrrsssreresrreresreresereseseere 54 6 Update gauge with new features cccccscsccscsssccsccccsccccscsccccsccccscescscsseccece 56 6 1 Connect the gauge to a computer via USB eR Re ee eR Er 56 7 Verify your gauge accuracy between factory Calibrations csccscsssseseceee 58 8 What to do if you have trouble with the gauge csccscscsscscsccsccccsceccscees 61 8 1 Re calibrate touchscreen if keys
6. When using set speed or set pressure the AutoZero interval is three Page 20 of 96 Retrotec Inc 2014 minutes This interval seconds can be changed using the DM32 Configurator software on a PC See Retrotec s Manual Software DM32 Configurator for details Page 21 of 96 Retrotec Inc 2014 3 Get Results directly from the gauge 3 1 Connect Speed Control Cable between the gauge and fan Refer to section 2 1 which describes the connection ports from the gauge to a device such as a Retrotec calibrated fan The connections for pressure tubing between a DM32 and a device are the same as the connections between a DM 2 gauge and that device Refer to Retrotec s Manual Door Fan Operation for detailed illustrations on these connections depending on what kind of test is to be performed 3 2 Connect pressure tubes to gauge 3 3 Control the test and read Results on the Home screen e Tap Range Device to select the Range Configuration in use e Ifthe Range Configurations associated with the Device in use do not appear tap Change Device to change the Device first e Tap Settings to display gauge settings that can be changed e Ifthe Area or Volume key appears tap to enter a value for conditioned area or volume which will be used to compute the result displayed on Channel B e Tap Set Speed to run the fan at a particular speed e Tap Set Pressure to achieve a particular enclosure pressure e Tap Channel A
7. connected to the Configurator click Copy to All Gauges 11 Itis now safe to disconnect the DM32 gauge s from the PC and verify the connection 5 5 2 On DM32 verify wireless credentials after updating If using DHCP addressing verify the gauge has obtained a network address by checking the white text on the IP address key for an IP address that is valid on your network Page 54 of 96 ORetrotec Inc 2014 You should also see the Network name SSID that you entered directly or in the DM32 Configurator showing up in Setttings gt Network gt Wireless settings If using Static IP addressing and you have entered the values directly using the IP address Subnet mask and Gateway keys or if you have entered them using the DM32 Configurator software you should see the values you entered displayed in Setttings gt Network Page 55 of 96 Retrotec Inc 2014 6 Update gauge with new features New features are occasionally released for the gauge in the same way that new features are released for your smartphone To check for updates you must use the DM32 Configurator software on a computer connected to the Internet The DM32 Configurator offers a wizard type procedure to guide you through updating the gauge firmware For detailed instructions refer to Retrotec s Manual Software DM32 Configurator DM32 Configurator 0 9 4 14 Connected gauges will be automatically added to this list Click the but
8. 0 940 0936 0 931 0 927 0 923 0 919 40 0 964 0959 0954 0 950 0945 0941 0936 0932 0 928 45 0973 0968 0964 0959 0955 0950 0 946 0 941 0 937 50 0 983 0978 0973 0 969 0964 0 960 0 955 0 951 0 946 55 0 992 0988 0983 0 978 0974 0969 0 964 0 960 0 956 60 1 002 0997 0992 0 988 0983 0978 0 974 0 969 0 965 65 1012 1007 1002 0997 0992 0988 0983 0979 0 974 80 1041 1036 1031 1 026 1021 1016 1 01 1007 1002 85 1 050 1045 1040 1 035 1030 1025 1 021 1016 1 011 90 1 060 1055 1050 1 045 1040 1035 1 030 1 025 1021 95 1070 1064 1059 1 054 1049 1044 1 039 1 035 1030 100 1 079 1074 1069 1 064 1059 1054 1 049 1 044 1039 105 1 089 1084 1078 1 073 1068 1063 1 058 1053 1048 10 1 098 1093 1088 1 083 1078 1073 1 068 1 063 1058 LL Nm OU ho ho O z H 2 o O Page 89 of 96 Retrotec Inc 2014 Table 15 Temperature correction factors for enclosure PRESSURIZATION P onside Temperature F OZS o 5 55 co es vo 75 eof 85 oo 20 1058 1069 1079 1089 1100 1110 1120 113 1141 15 1 052 1062 1073 1 083 1093 1 104 1 114 1 124 1 135 10 1 046 1057 1067 1 077 1087 1098 1 108 1118 1 128 5 1 041 1051 1061 1 071 1081 1092 1 102 1112 1 122 O 1 035 1045 1055 1 065 1 075 1086 109 1 106 1 116 5 1020 1039 1049 1060 1070 1080 1
9. Door Panel and lay the end down out of the way of any air flow from the fan The Retrotec gauge can be connected to fans from other manufacturers such as the Minneapolis Model 3 and Model 4 fans To connect the gauge to a Minneapolis Model 3 or Model 4 Fan 1 Using the included Retrotec Umbilical cable connect the yellow pressure tube from the yellow port of the gauge to the open port on the fan Page 76 of 96 Retrotec Inc 2014 2 Some newer versions of the Model 3 and 4 contain an additional Reference port If available connect the green tube in the Umbilical cable from the green port on the gauge to the Reference port on the fan 3 The power and Control Cables included in a Retrotec Umbilical cannot be used when using a 3rd party fan Make sure the batteries are fully charged prior to beginning testing To conduct a basic pressure test and ensure your gauge is working Turn the gauge on by pressing On Off Check the battery power before beginning a test to ensure the gauge has enough power to complete the test Plug the gauge in or recharge batteries if needed 3 Select the appropriate device to which the gauge is connected by tapping Range Device gt ChangeDevice Select the Range Configuration installed in the fan by tapping on its picture 5 Tap Channel B to select the required results to display Note that the result displayed can be changed at any point during the test 6 Select an appropriate time averaging
10. If WiFi is enabled on your DM32 you will also see choices for e WiFi Create to turn on the WiFi hotspot for phones and computers to find e WiFi Join to let the DM32 join an existing network For information about using the gauge with a Network and for detailed instructions about further settings required refer to Section 5 The Status should be set as Disabled if the gauge will be connected to the computer with a USB cable since this direct connection does not involve a network If the USB cable is just being used for charging the battery the Network settings do not need to be changed Page 43 of 96 Retrotec Inc 2014 Baseline E None Taken Disabled 1 000 sq ft Volume 1000 cu ft Time averaging 5 seconds ort 4 Misis y A CE ja dd Result to De d JUCTS U C Juse U O Subnet mask Flow CFM l 255 255 0 0 Set Set Set Pressure Pressure Speed Settings Figure 48 Choose Disabled or Wired for the gauge Network connection 4 9 View and update the Firmware version check serial number Firmware is the underlying software installed on the gauge To find out what version of the firmware is installed tap the Firmware key Settings Settings Version 1 Build 1 123456 None Taken 1 000 sq ft 1000 cu ft 5 seconds Flow CFM Figure 49 Gauge serial number and firmware version are shown on the third settings screen Page 44 of 96 ORetrotec Inc 2014 The
11. Settings gt Result to be displayed gt Pressure until the desired units are displayed U e The Channel A Reading will be negative if there is a higher pressure on the red pressure port e The Channel A Reading will be positive if there is a higher pressure on the blue pressure port The Channel A Reading is also a key when it is tapped the Channel A and Channel B displays are frozen This feature is convenient for jotting down test data HOLD will be displayed in the Top Bar to indicate the readings have been frozen 2 6 2 Channel B Pressure Reading or Result The Channel B display can show the pressure difference between the yellow pressure port ref B and the green pressure port input B If the pressure tubes are connected as illustrated in Retrotec s Door Fan Operation manual Channel B shows the Fan Pressure U e The Channel B pressure will be negative if there is a higher pressure on the yellow pressure port e The Channel B pressure will be positive if there is a higher pressure on the green pressure port The gauge can also use the pressure on Channel B to calculate and display different results for the Channel B Result such as e Pressure Pa psf or in WC e Flow CFM L s cu m s cu m h e Flow Area Permeability CFM sq ft CFM 100 sq ft CFM 1000sq ft cu m h sq m L s sg m Page 16 of 96 Retrotec Inc 2014 e Air changes p
12. a gauge and computer over USB connection requires the USB Device Driver to be installed on the computer that is to connect to the gauge s This driver is installed automatically when the DM32 Software Suite any of the individual Retrotec software or a new version of FanTestic is installed To update the firmware version on the gauge it is mandatory to connect via USB and use the DM32 Configurator software i e updating firmware version on the gauge will not work if connected via an Ethernet Cable It is possible but not recommended to connect the gauge to a computer via USB and use FanTestic or the Virtual Gauge software to control its functions Normally the gauge should be connected to a computer using the Network port and an Ethernet cable since this form of connection is more stable less susceptible to interference and can run longer distances Retrotec software FanTestic Virtual Gauge Data Logger should be able to detect the gauge s shortly after they are connected to the computer via USB Page 57 of 96 Retrotec Inc 2014 7 Verify your gauge accuracy between factory calibrations Recommended calibration interval for the DM32 series is 5 years The question is when did the gauge go out of calibration Last week or last year What is needed is a quick field check to check your gauge regularly and before any important test Moreover gauge calibration where errors are typically a few are not as freque
13. and taken at the Reference Pressure This ELA is sometimes called the EgLA or Canadian ELA because it was first used in the Canadian GSB air leakage standard for houses This ELA enjoys worldwide acceptance by most testers even in the US This ELA should not be confused with another ELA that is often called the EfLA or Effective Leakage Area It is very unfortunate that both these ELA s have the same acronym of ELA The EfLA was developed for the US ASTM Standard and is smaller than the EqLA by at least a factor of 0 61 because it uses a discharge coefficient of 1 0 This EfLA is sometimes called the LBL or Lawrence Berkley Labs ELA because it was developed there and is used in the LBL natural air change model that enjoys wide usage apart from that usage the EfLA is not used very much but the existence of both can create huge problems When it is taken at a reference pressure of 75 Pa it is often referred to as EqLA75 EqLA is typically about twice the size of an effective leakage area that describes the same air flow rate See ASTM E779 10 eq 5 The pressure difference between inside the door fan and the surrounding air This pressure can be read as PrB from Channel B on the gauge It is used by the computer to calculate the air flow rate through the Door Fan This is the same as Leakage but expressed in sq ft or sq m ween Nationa Fire Protection Association Pascal Pa A very small metric unit of pressure There are 249
14. don t respond well to taps cceeccccsssececeesececeeeeceeseeseeeeeeeeees 61 8 2 Gauge may get stuck running Re calibrate touchscreen if the battery gets into a low state 62 8 3 Reset if you need to clear the gauge to base SELtINGS cccccccssecccceseccecesececseeceeeeeeceeseeneeeteuneses 62 8 4 Flashing screen may appear as gauge recovers from deep discharge ccccccescccesscseeeeseeeneeeeees 62 8 5 Pressing power button may not turn gauge On if battery is fully discharged 62 8 6 Gauge will not reset run splash screen while gauge is plugged into POWET ccccccceesseeeeeeees 62 8 7 Flashing yellow LED on front means gauge had an internal malfunction cceeeeceeeseeeeeeeeeees 62 Page 5 of 96 Retrotec Inc 2014 8 8 Calculated Result will be wrong if the Range and Device installed on fan are different than those Selec dome CANDEIAS O Ad RU e 63 8 9 Moving tubes might cause fluctuating pressure readings cccccccesseccceessecceeesececeeeecceseuseeeseuaeees 63 8 10 Fans with a single tube have results adjusted by gauge cccccsseccceesececeescceceesececeeeceeeeneceesenes 64 8 11 Pressure can overshoot when using the Set Pressure Key ccsccccssseccceesscceeeescceeeuecetseneceeeeees 64 8 12 Check if large fixed errors are caused by pinched tubeS cceeccccesseccceesecceeeseceeeeseceeseeceeeeees 65 8 13 Check if large fixed errors are caused by water in th
15. easily be eliminated by taping or tying down the tube Next a large and steady pressure of 10 to 70 Pa will appear if the tube end has touched water and a drop has sealed off the end Stepping on the tube or pinching the tube will induce a Bias pressure so ensure that tubes are not pinched and are located away from walkways If air inside the exterior heats up due to the Sun shining on it and if the tube end is above or below the point where it leaves the enclosure a stack pressure will build up inside the tube that will create a steady pressure that may increase as the tube gets hotter Page 73 of 96 Retrotec Inc 2014 Managing fluctuating pressures created by wind There are two types of pressure that wind creates stagnation pressure and velocity pressure Stagnation pressure is felt over a large area in the windward side and for several feet from the building and is a result of the air stacking up due to the wind velocity The wind s velocity is converted to a pressure Stagnation pressures are reduced by moving the outdoor pickup point about 15 feet from the building or away from any object that the wind will strike Place the tube at ground level with a flat plate covering the tube The pressure field around the building changes from side to side and because the wind direction varies Somewhat using two pickup points at least 20 feet apart will reduce these fluctuations Velocity pressure is caused by the velocity impinging in the en
16. on the gauge then the following tables can be used to determine the correct flow as long as the fan was blowing Away from the operator which is depressurizing from the inside or pressurizing from the outside The gauge converts the fan pressure to CFM based on the Range Configuration selected on the gauge If you realize that you have recorded results while the selected Range Configuration is different than what was installed in the fan look up the recorded flow on the Flow Conversion tables for the Device and read across to the correct range column to determine what the result would have been if you have put the gauge on the correct Range Use the Flow Conversion Chart for your fan to locate the correct results as follows In this example you were testing with a DU200 DucTester with Range Device on the gauge set to Mid Later you remembered your DucTester actually had the Low Range Ring attached You recorded 33 CFM Find the 33 CFM you recorded under the Mid column for Range on the Flow Conversion Table Then just move over to read the correct result under the Low column for Range In this case it will be 7 1 CFM Fan Pressure Pa Open Mid Low 10 100 4 2 12 110 4 7 14 119 o 5 1 16 127 27 5 6 18 135 28 6 0 20 142 30 6 3 22 150 32 6 7 r CE 26 163 39 7 4 28 169 36 7 8 30 175 37 8 1 32 181 39 8 4 Here is where to find those tables depending on the type of system you are using For Blower Doors see Door
17. or registered trademarks of their respective owners Wireless communication is certified under Wi Fi 802 11 with ASD Model Test Plan with Test Engine for IEEE 802 11a b and g Devices Version 1 0 This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to part 15 of the FCC Rules These limits provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures e Reorient or relocate the receiving antenna e Increase the separation between the equipment and receiver e Connect the equipment into an outlet on a circuit different from that to which the receiver is connected e Consult the dealer or an experienced radio TV technician for help Caution To satisfy FCC RF Exposure requirements for mobile and base station transmission devices a separation distance of 20 cm or more should be maintained between the antenna of this device and persons during opera
18. other documents standards used in the industry Cubic feet per minute the units of volumetric flow Control Cable An Control Cable used to control Retrotec fans Control port Control port on a Retrotec fan labeled Control The process of creating a negative pressure in the enclosure by blowing air out ofit Airis drawn in from outside to replace it showing up as geysers when checked with an air current tester digital gauge A gauge with an electronic pressure sensor and digital display that is capable of reading in tenths of a Pascal Door Fan A test instrument that fits into an open doorway in order to pressurize or depressurize an enclosure Itis a calibrated fan capable of measuring air flow and is used while mounting it into a doorway A Door Fan is often called a Blower Door or an Infiltrometer Door Panel A solid or flexible panel used to temporarily seal off a door way while allowing for the installation of a fan for the purpose of blowing air into the building in order to measure the air leakage rate or to provide a pressure to assist in the location of air leaks Retrotec s duct testing system is named the DucTester air leakage Pertains to how leaky an enclosure may be The movement flow of air through the building Envelope which is driven by either or both positive infiltration or negative exfiltration pressure differences or test pressures across the building Envelope Depressurization
19. out to the user but can change over time If you end up not being able to get the gauge to respond to your taps at all for instance if you tap in the wrong location during the Re calibrate touchscreen routine and confuse the gauge you will have to connect the DM32 to a computer and run the DM32 Configurator software the Settngs tab has a button you can click which will cause the connected DM32 to run the Re calibrate touchscreen procedure Page 61 of 96 Retrotec Inc 2014 8 2 Gauge may get stuck running Re calibrate touchscreen if the battery gets into a low state If your gauge runs the Re calibrate touchscreen procedure when you turn it on it may have discharged to a too low battery state To recover from this error plug the gauge into mains AC power and leave for at least a half an hour The charging should bring the gauge up to a minimum power level needed to maintain the touchscreen calibration This anomaly has been averted in gauge firmware 2 1 7 or later 1 1 7 for first generation gauges in the red case 8 3 Reset if you need to clear the gauge to base settings If you want to return the gauge to its base settings as if it just came off the assembly line you can reset it using a paper clip First turn the gauge OFF using the power key on the front if possible Next poke the end of the paperclip into the small hole marked Reset next to the USB connector on the bottom of the gauge The splash sc
20. press for 2 seconds cceccccesscccececeececeecseeueceeeeseeeueceseuesseeneseeens 12 2 4 Read Results and control the gauge from the Home SCIEN cccecccesesccesecceeecseeeeceeeueceeeneeeeens 12 2 5 Observe icons on Top Bar to monitor gauge status eccceeeseccccessececeeececceecceeeeseceeaueceeeeneceesenes 14 2 5 1 What speed is being sent to the fan on the Fan Speed output cssieees 14 25 2 Over what time period is the Result being averaged csscccccssecceceeseceeeeseceeeeeceeeeeeeeeeas 14 2 5 3 Result display can be frozen to write down values cccccceeeccceeececenececeececeeeceseueceeeueceeenses 14 2 5 4 Is the gauge connected to a Network cescccccssccecssececeeeceeeeescceceusecesseeeceeseuecessuecetseges 14 2 5 5 HOW MUCH battery e remalhs Pais ca ns a rnn Das so aba DS EAD ee eae 15 2 6 Use keys on the Home screen to control gauge operation ccccceeseccccesseccceesececeeeceesaeseeeseeaeees 16 2 6 1 Channel A Pressure Reading asas diGasiADiaG asas la bri sda a at ho O nba Du DCE aise ieie 16 2 6 2 Channel B Pressure Reading or Result ccccccseccceeecceeeeccesceceeeceeeecseeeceseeeceseueceeeneceeensss 16 2 6 3 Set the Range Device connected to the ZaUGE cccececssssssseeeeeeeecececscsseeeeseeueeeeenseeeeees 17 2 6 4 Estimate Results WITH Pressure aniier GURI EG CS CEI GUS 19 2 6 5 n value for Pressure Extrapolation
21. pressure and then use the Jog key to increase the set point in smaller steps The speed control in the gauge has been optimized to achieve the desired pressure as quickly as possible and to remove the overshoot would force the user to wait much longer Pressures can also overshoot when the range is set incorrectly Ranges should always be selected so the fan runs at the fastest possible speed in order to achieve the lowest desired test pressure To mitigate pressure overshoot when using the FanTestic software enter the list of pressures in order of pressure with the lowest first For example set pressure range from 10 to 60 Pa rather than 60 to 10 Pa To experience the overshoot and understand how to avoid it perform the following test on the Retrotec simulator or on a tight room where the leakage can be adjusted For an example using a 1000 fan set Device to 1000 range to C1 time averaging to 10 seconds Set the leakage area on an enclosure by adjusting the size of the hole When using the Retrotec simulator use the sliding panels to adjust the size of the hole Optionally measure the leakage area with a Door Fan using Page 64 of 96 Retrotec Inc 2014 EqLA10 which you can access using the Channel B key Watch the gauge carefully to detect the peak pressure reading on Channel A and the peak percent speed on the bottom right hand of the display Device 1000 2000 3000 1000 1000 1000 1000 1000 1000 1000 Repete qu ja qa quo ja
22. stiffness 2 Cuta2 x 2 square hole in the center of the other side of the box again where the cardboard is only one layer thick This is the flow measuring hole For accuracy the small hole should be at least 1 5 inches from the edge of the box and its area should be less than half the area of the end of the box 3 Tape any cracks in the other sides of the box to prevent air from leaking Figure 73 Exhaust fan flow Punch a 0 25 inch diameter hole near a corner of the open end of the box mee for the pressure tube Insert a tube in the hole 5 Connect the tube to the ref B yellow and input A blue ports of the gauge using a T connector 6 Fit the box over the exhaust fan grille while it is running and seal in place around the box edges 7 Observe the pressure in the box on A The same pressure will show on B if displaying pressure on B 8 Increase the size of the flow measuring hole in the box until the pressure is between 2 and 8 Pa 9 The gauge will calculate the exhaust fan flow if you Change Device and choose Hole Flow from the Generic Device screen of choices 10 Enter the area of the hole into the gauge when prompted by the gauge 11 Read the Exhaust Flow in CFM directly from the gauge on B The Hole Flow function calculates airflow rates through a hole using the following equation Flow Hole Area vPrB x 1 0755 Where Flow is in units of CFM Hole Area is in unit
23. that the air would not be turbulent but rather would go through the holes as laminar flow This means that when pressure is quadrupled the flow will also be quadrupled flow Pressure flow Pressure 4 x flow 4x Pressure Page 85 of 96 ORetrotec Inc 2014 Houses and ducts have many holes that will have both turbulent and laminar flow going through them Duct holes tend to be slightly larger whereas houses have more prevalent long tiny cracks and therefore tend to have lower n values These n values can be measured simply by doing a multi point Blower Door or Duct Test The result will be ann and aC coefficient so flow at any pressure can then be calculated by using the equation flow Pressure x C The gauge uses the n value to extrapolate for flows at other pressures Because the extrapolation function is a ratio of two flows from the same fan the C value cancels out For example If we guess at the n value of a duct as being 0 6 and measure 100 CFM at 20 Pa by accident or by design then the DM 2 will complete the following calculation to estimate the flow at 25 Pa flow 20 Pa 200 6 If the test pressure 20 in this case is close to the desired reference pressure 25 Pa in this case then the correction is small and the value of n does not play as large a role However if the test pressure is much higher or lower than the reference pressure the error can be greater flow 25 Pa 25 x The Pressure fea
24. the fan while the fan pressure pickup is on the opposite inlet side The exhaust side is the side on which the room pressure is being induced by the fan Readings on Channel A in this case will always be positive measuring the induced pressure in the room Because the gauge which has the green input B port is in the room with the induced pressure the pressure difference measured on Channel B will include the induced room pressure as well as the actual Fan Pressure across the inlet Channel B will thus show a pressure difference that is larger than the actual fan pressure larger by an amount equal to the induced room pressure being measured on Channel A Any time the gauge sees a positive pressure on Channel A it automatically subtracts the value on Channel A from the value on Channel B before calculating flow and other results The value displayed for B is left as the raw measured value and does not have the Channel A value already subtracted If using a raw measured value read from Channel B on a Retrotec gauge use the following equation to adjust the Fan Pressure and calculate the flow Flow Toward Operator CFM FP RP RPXK1 x K FP RP x K3 x K4 Where FP is the fan pressure from Channel B displayed on gauge RP is the room pressure from Channel A displayed on gauge Case 3 Self Referencing Fan Self referencing fans can be identified because they have ports for two pressure measuring tubes o
25. to Hold results being displayed e Tap Channel B to change the Result to be displayed e Tap Pressure to estimate a Channel B Result at the set pressure To jump to screen illustrations showing how to use each function click on the hyperlink in the above list 3 3 1 Tap Range Device to match Range on Device in use 0 0 speed l 5s avg Select Range for 200 S 0 0 Figure 13 Change Range for selected Device 3 3 2 Tap Range Device gt Change Device to change Device in use Page 22 of 96 ORetrotec Inc 2014 0 0 speed 5savg Figure 14 Change Device in use 3 3 3 Tap Set Speed to run the fan at a particular speed The gauge can automatically control the fan speed on Retrotec systems to achieve a specific fan speed entered by the user 0 0 speed 5 s avg Figure 15 Set gauge speed control output Fans manufactured by TEC such as the DuctBlaster or Minneapolis Model 3 or 4 can also be controlled if an optional Retrotec TEC speed control Adapter is connected between the gauge and the TEC fan in the Speed Control cable as shown in Figure 12 Pressure tubing needs to be attached to the gauge using the Retrotec conventions described in the Retrotec literature 3 3 4 Tap Jog keys to adjust speed up or down 5 Page 23 of 96 Retrotec Inc 2014 220 speed 3 5 avg o 424 804 7 3000SR el be 45 0 speed ES e ds Figure 16 Adjust speed up or down 5 using Jog
26. turn extrapolation off e Tapping STOP will also turn extrapolation off and make it unavailable as long as HOLD is not being used to freeze the Result display 6927 6 CFM 75 Figure 32 Turn O Pressure off leaves fan running Page 32 of 96 ORetrotec Inc 2014 100 0 speed 5 5 avg e o 68 1 Pa Figure 33 Stopping fan disables and turns O Pressure off Page 33 of 96 ORetrotec Inc 2014 4 Change Settings for gauge operating parameters Tapping Settings from the Home screen will bring up a menu that lists gauge settings There are three Settings screens each displaying a number of gauge operating parameters that can be changed settings ettings Settings None Taken Disabled Version 1 Build 1 123456 1 000 sq ft 50 Pa 1000 cu ft 1 Hour 5 seconds Enabled Flow CFM n 0 65 Figure 34 Settings can be changed on the gauge and are remembered when the gauge is turned back on More specifically the Settings allows a user to e acquire and apply bias pressure correction by tapping Baseline gt Capture Baseline e enter the conditioned Area or Volume sometimes needed by Result to be displayed e enter the number of seconds for Time averaging e change the type of and units for the Result to be displayed e tap Network then tap Status to toggle connection types and edit network credentials e seta Default O Pressure for Result ext
27. up to 55 Pa and down to 45 Pa making it very difficult to take a reading 8 15 1 Use the Pressure Key to reduce the effects of wind Variable readings caused by changing input pressures can be rectified by using the Pressure key which will extrapolate the reading to the desired pressure regardless of the actual pressure being experienced at the moment This does not solve the problem completely but it does make it easier to take a reading 8 15 2 Use Time Averaging feature to reduce the effects of wind Variable readings caused by changing input pressures can be rectified by increasing the Time Averaging to 20 seconds or more Quadrupling the Time Averaging typically halves the pressure variation due to the effects of wind Be aware that if the fan is increasing or decreasing in speed it will take 20 seconds at least for the gauge to register its reading For example if during the initial 10 seconds there was no building pressure whatsoever and during the second 10 seconds there was 50 Pa then the gauge will average that to 25 Pa The rule of thumb here is to wait for at least double the time average period before a reading is taken Time Avg exercise to practice reducing the effects of wind 1 Use a fan to create an air stream 2 Set Time Averaging to 1 s 3 Place a tube connected to the positive port in the path of the air stream 4 The gauge will display a pressure that fluctuates Adjust the wind speed until t
28. value for the test conditions by tapping Settings Time Average and choosing a value 7 Tap Settings Baseline gt Begin Capture to begin acquiring a baseline pressure reading Tap End Capture after 60 seconds to set the baseline reading 8 Either press Set Speed to set the fan speed to a particular percentage OR press Set Pressure to control the fan to a particular building pressure 9 To view estimated flow at the exact target pressure use the O Pressure function 10 Tap Channel A to Hold the results on the display to make them easier to copy down The gauge calculates Flow based on Pressure readings from the fan The air flow being produced by the calibrated fan is a value that can be calculated based on the pressure developed by the air moving across the inlet side of the fan towards the exhaust Because the fan is calibrated there are known values describing the mathematical relationship between the fan pressure which is measured across the fan inlet and the resulting air flow through the fan The Fan Pressure needed to calculate the fan flow is the difference between the pressure at the pickup and the pressure in the vicinity of the inlet side of the fan The fan pressure pickup is located inside the fan near the inlet side of the fan Self referencing fans have the reference port built in and it is placed to measure the ambient pressure in the vicinity of the inlet side of the fan Fan Pressure FP is determi
29. 0 Retrotec Blower Door 200 300 1000 2000 3000 3000SR 4000 5000 and 6000 and TEC Devices MN 3 amp MN 4 No extrapolation can used when set pressure is zero 2 6 6 Capture and apply a Baseline using Settings Some buildings have an initial pressure imbalance between the indoors and outdoors prior to any testing This pressure imbalance is called the Baseline pressure bias pressure or static pressure The Baseline function allows the user to capture the Baseline pressure under the existing test conditions See Section 4 1 for illustrations of how to capture a Baseline Once captured the gauge will automatically subtract the Baseline pressure from all subsequently measured pressure readings and will display only the adjusted pressures on the screen The gauge averages Baseline pressure for a user defined duration Tip A 30 second Baseline acquisition is typically enough to establish an accurate baseline measurement If the building conditions change during the test the baseline should be cleared and a new measurement should be taken Zl Gauge compensates for sensor drift with Auto Zero Over time the pressure readings on Channel A and Channel B can start to drift away slowly from the true pressure value The longer the gauge remains on the larger this error could become The Auto Zero is a feature on the gauge that will automatically correct these errors at regular intervals By default Auto Zero occurs every 30 seconds
30. 000 0 020 ra 0 0160 Retrotec 0 5050 61 3000 0 054 0 0040 1000 2090 0 5077 42 0000 0 009 0 0009 3000 3000SR 0 5200 22 0000 oa os eon fio fa 0 0010 E a u fosso 40005 0003 10 fo 12 osoo 2068 000 os o u 0425 rte 0x0 Jos sa LR E a beue la xi Lason fason Jum fue oo a DuctBlaster ging2 05064 15200 0900 10 00 1o Ring3 0540 5800 090 10 oo 10 open 04879 so6800 000 10 00 10 a Joss 1501000 oo 10 00 fio Mn Modela B 04955 60 6700 000 10 00 1o ov c Josi 213700 oo 10 00 J o o oa 7260 ooo 10 00 J o E tosa famo toso 10 foo las Open 0458 498 9000 090 10 o J o Mn Modela A 04889 190100 0900 10 o io 230V fome fasmo faao fiolo fa oss 20400 ooo 10 o lis Page 79 of 96 Retrotec Inc 2014 10 pa O w l 0 5022 6 8700 0 000 0 5139 2 8170 0 000 0 4848 438 7000 0 000 e je Je O IO JO 0 4968 48 0800 0 000 e JJe O O 0 5157 11 3600 0 000 pa O Mn Model 4 0 5032 7 2460 0 000 0 5166 2 8020 0 000 0 5000 43 7300 0 000 230 V 0 5000 20 7200 0 000 e je je O IO JO 0 5000 10 0700 0 000 H 1 3 3 me fat 05000 5000 1150000 0000 0000 000 Flow pa O Range n k a 0 4952 160 8000 0 000 e je oo cj je jp eee vila O O JO JO JO JO JO JO JO JO JO JO JO e je Je je Je je je e IN IN N je Je O O lo lo lo MU qn JA jO A n ju e e O IO Table 9 N and K coefficients for all gauge supported fan
31. 090 1100 1110 10 1 024 1084 1044 1 054 1064 1074 1 084 1 094 1 104 15 1018 1028 1038 1 048 1058 1068 1 078 1 088 1098 20 1013 1023 1033 1 043 1053 1063 1 073 1083 1093 25 1 008 1018 1028 1 087 1047 1057 1 067 1077 1087 30 1 003 10193 1022 1 032 1042 1052 1 062 1072 1081 35 0 998 1007 1017 1 027 1087 1047 1 056 1 066 1076 40 0 993 1002 1012 1 022 1082 104 1 051 1061 1070 45 0 988 0997 1007 1 017 1026 1036 1 046 1055 1065 50 0 983 0992 1002 1 012 1021 1031 1 041 1 050 1060 55 0 978 0988 0997 1 007 1016 1026 1 036 1 045 1055 60 0973 0983 0992 1 002 101 1021 1 031 1 040 1050 65 0 969 0978 0988 0997 1007 1016 1 026 1035 1045 80 0 955 0964 0974 0 983 0993 1002 1 011 1021 1030 85 0 951 0960 0 969 0 979 0988 0997 1 007 1016 1025 90 0 946 0956 0965 0974 0983 0993 1002 101 1021 95 0 942 0951 0961 0970 0979 0988 0 998 1007 1016 100 0 938 0947 0956 0 965 0975 0984 0 998 1002 1011 105 0934 0943 0952 0 961 0 970 0980 0989 0 998 1 007 10 0 930 0939 0948 0957 0966 0975 0984 0 993 1 003 LL Na OU Bm _ O E p OU p2 p O Page 90 of 96 Retrotec Inc 2014 Appendix F Tables to correct Flow if range selected did not match the installed range If the range installed was different than the range selected
32. 254 1 1 Wired 169 254 1 1 Static 0 0 0 0 Not connected 255 255 0 0 0 0 255 255 0 0 255 255 Set Subnet Mask 255 255 0 0 Figure 55 Numeric entry keypads to enter values for Static mode Network settings 5 3 Connect multiple gauges to a computer via Wired network When connecting multiple gauges to a computer the most reliable connection is the Wired Network Most computers only have a single Ethernet network connector so in order to connect multiple gauges a powered Ethernet switch or router must be used to group the gauges and feed a single Ethernet cable to the computer carrying information from all of the gauges as shown in Figure 56 Page 49 of 96 Retrotec Inc 2014 Figure 56 Connect multiple gauges to a wired network using a powered Ethernet Switch Each gauge can be located up to 328 feet 100 m from the switch router used to group the gauges and that switch router can be similarly up to 328 feet 100 m from the computer so the switch router also provides a way to extend the distance between the gauge and your computer There are a number of ways to connect gauges to a computer or other device using networking as shown in Figure 57 and Figure 58 If more than one gauge is to be connected to a computer the customer must supply the switch router networking devices shown in the diagram The Router Creates a network The other devices then Join the network that has been created by the Rou
33. 50 Pa if gauge n 0 65 differs from actual n Actual Flow Exponent n of Enclosure 055 0 60 065 0 70 075 Achieved FR E E lom am ame iai so fax Jum fom oox om am If the n value on the gauge is set to 0 60 and the enclosure n is different an error as shown in Table 13 will result if the Pressure function is used at the Achieved Pressure to estimate result at 50 Pa Table 13 Errors in Estimated Flow at 50 Pa if gauge 0 60 differs from actual n Actual Flow Exponent n of Enclosure 050 oss 060 oes 0 70 075 Achieved pote fo Jim fos om om rex 27 Achieved pressure is the actual maximum pressure achieved in the enclosure during the test Pressure of I n Assumed n Emor di Achieved Pressure Page 87 of 96 Retrotec Inc 2014 In the tables the Pressure of Interest is 50Pa and Assumed n is 0 65 or 0 60 The actual flow exponent n for an enclosure can be calculated by measuring building leakage at multiple pressure differences from 10 to 50 Pa and determining the slope of the line Flow C xPressure The graph of pressure versus flow will be linear if graphed on a log log scale and the slope will be n Page 88 of 96 Retrotec Inc 2014 Appendix E Tables to adjust Flow values for temperature difference Temperature correction is only required when there is a temperature difference between the area under test inside and the area used as referen
34. Baseline 0 3 Pa 0 3 Pa 93 sq m 28 cu m 5 seconds Pressure Pa lt None Taken 93 sqm 28 cum 5 seconds Pressure Pa Figure 36 Clear a Baseline 4 2 Set Area if using a Result per Area Dimensions are required for the gauge to calculate some of the results that are available to be displayed on Channel B Page 35 of 96 Retrotec Inc 2014 The area is required for the calculation of any of the results that are divided by an area normalized leakage area and permeability results When required the Area key appears on the Home screen 0 0 speed 5s avg Set area 0 0 speed 5 5 avg 0 1 1000 sq ft 0 1 Pawith0 3 Baseline Pawith0 3 Baseline 2 1000 ar E EM E 53 c8 CFM sq ft 1 000 sq fi Figure 37 Set the Area needed for per Area type Results from the Home screen The Area key on the Settings menu provides another way to enter the area of the enclosure or building under test The key on the Settings menu operates exactly the same as the Area key on the Home screen but allows the user to enter the area without changing the Result to be displayed to one of the normalized or permeability results to make the Home screen Area key appear Settings set area Settings 0 3 Pa 1000 sq ft 0 3 Pa 4 844 sq ft 2 1 000 sq ft 9258 cu ft gt 2925 cu ft 5 seconds 5 seconds Flow Area CFM sq ft 5 Flow Area CFM sq ft Figure 38 Set the Area needed for per A
35. Fan Operation Manual Appendix D Flow Conversion Tables Manual Door FanOperation pdf For DucTesters see DucTester Operation amp Testing Manual Appendix C Flow Tables Manual DucTester Operation amp Testing pdf Watch this quick video on choosing the wrong range and how to recognize it Video image http www youtube com watch v JP1RsL3pm8E amp list UUr qgIDfAh9wq88Pye4vE8w amp index 48 amp feature plpp video Page 91 of 96 Retrotec Inc 2014 Appendix G Measure Supply or Exhaust flow with a gauge and box The Retrotec gauge can be used to measure the amount of air flowing through a hole This feature enables the gauge to be used as an Exhaust Fan Flow Meter by simply cutting a couple of holes in a cardboard box The open end of the flow box should have rough dimensions which are at least two times the register dimensions and the depth of the box should be at least the average of the other two dimensions Because flow through a known size hole depends on pressure across the hole and air flow into an enclosed space will cause pressure we can use a box with a hole in it to measure the system air flow This method partially blocks the flow from the air handler so readings are not exact especially if pressures in the box are above 8 Pa To create an Exhaust Fan Flow Meter 1 Cuta hole in one side of a medium sized cardboard box where it is only one layer thick and leaving about one inch of cardboard around the edge for
36. Pascals in 1 inch Water Column the pressure required to push water 1 inch up in a tube of a water filled manometer One Pascal 0 000145 psi Pressurization The process of creating a positive pressure in the house by blowing air into the enclosure Air is pushed out through all the leaks causing the smoke to move away from the operator when checked with an air current tester Range configuration The Open Range the Range Plate or Range Ring that is used on the fan during a Door Fan test See Retrotec s Range Configuration QuickGuide Range Plate The Range attachment on the Retrotec Door which holds Ranges C8 C6 C4 C3 C2 C1 L4 L2 and L1 See Retrotec s Range Configuration QuickGuide Range Ring The plastic Range attachments on the Retrotec Door which include Range A and Range B See Retrotec s Range Configuration QuickGuide reading A set of simultaneous Room Pressure and Fan Pressure readings Sometimes referred to as a data set or test point because it is plotted as one point on a graph The pressure at which the ELA or ACH is calculated usually at the test pressure tom See Enclosure Page 95 of 96 Retrotec Inc 2014 Equivalent Leakage Area ELA or EqLA E Term room pressure The pressure difference created by the Door Fan between inside and outside of the enclosure This pressure is Commonly measured by Channel A on the gauge Speed Control port Output Control port on the gauge to control fan speed la
37. at which point it will stabilize If the pressure becomes positive the fan will slow down Set Time Averaging to 5 seconds unless readings waver more than 5 at which point increase time averaging The resolution of the control is 0 1 Pa Pressure pickup must be four pressure taps equally spaced and away from the airstream with a piezometric averaging ring configuration 3 3 2 Tap Jog keys to adjust pressure up or down 5 Pa Gy is Off 247210 2 75 1 MEDO amp 2633 4 Seeking 75 00 Pa Visco A 5 Pa 5 Pa Seeking 80 00 Pa Figure 18 Adjust pressure up or down 5 Pa using Jog keys 3 3 3 Tap Area or Volume to enter dimension for particular Results The Area key only appears on the Home screen if one of the permeability results requiring an input of area for the calculation is selected as the Result to be displayed on Channel B Page 25 of 96 Retrotec Inc 2014 0 0 speed set area 0 0 speed 5 s avg 0 1 1000saf 0 1 Pawith0 3 Baseline Pawith0 3 Baseline CFM sq ft CFM sq ft Figure 19 Enter an Area if the Result to be displayed is calculated with an Area The Area key from the Home screen opens the same screen as the Settings Area key combination The Volume key only appears on the Home screen if ACH Air Changes per hour is selected as the Result to be displayed on Channel B 0 0 speed 5 s avg 0 4 2925 cu 0 3 Pawith0 3 Baseline Pawith0 3 Baseline 0 0 spee
38. be and the negative side of the gauge Disconnect the Blue and connect the Green from the Green port to the Red Port to check that tube and the negative versus positive calibration of the gauge Page 58 of 96 Retrotec Inc 2014 Figure 64 Yellow tube between Channel A amp B Blue tube check of positive ports Green from negative to positive ports If the readings are different either one tube is blocked or the gauge is faulty Try another tube to see if it s the tube or the gauge Check each tube separately If differences on the gauge persist with different tubes connected repeat the test against another gauge Only then should a gauge return be considered The gauge does not really need calibration until the difference between the channels is 2 or more If you do see a difference greater than 2 make sure the Time Average is set to 4 seconds and that there is no Baseline reading in the label for Channel A Only if you see a huge problem should send your gauge back for factory calibration Pressure dropping to zero in 10 seconds indicates a leak somewhere try another tube and try the same tube on a different port to see which piece is faulty If the tube end is damaged slice 1 8 inch off the tube and try again To verify the gauge itself now that you know the tubes are in working order To verify the calibration of a gauge the easiest method is the cross port check shown in Figure 65 which compares the readings of one chan
39. beled Speed Control time averaging Refers to the digital gauge display that must have an adjustable averaging from 1 second to 1 minute for the purpose of averaging fluctuating pressure signals Averaging can be block averages that will update for the length of the average or rolling moving averages that will update continuously by displaying the average over the past time period Page 96 of 96 ORetrotec Inc 2014
40. ce for the test outside To use the tables determine if you are pressurizing or pressurizing When pressurizing the air flow of the fan will be toward the inside and when depressurizing the air flow will be toward the outside Choose the correction factor from Table 14 for the depressurize case or Table 15 for the pressurize case based on the current inside and outside temperatures Multiply the flow you measured by the factor to get the air flow corrected for temperature difference Retrotec s FanTestic software automatically corrects flow values for any temperature difference when inside and outside temperatures are entered into the software Table 14 Temperature correction factors for enclosure DEPRESSURIZATION pf onside Temperature F O O Z o 5 ss co es vo 75 eof 8 oo 20 0848 0844 0840 0 836 0832 0828 0824 0820 0816 15 0 857 10 0 867 0863 0 859 0 855 0851 0847 0 843 0 839 0 835 5 0877 0872 0 868 0 864 0860 0 856 0 852 0 848 0 844 OJ 0 886 0882 087 8 0 874 0869 0865 0861 0857 0 854 5 oss 0802 o8s7 0883 0 879 0875 0871 0867 0863 10 0 906 0901 0 897 0 893 0888 0884 0 880 0 876 0 872 15 0915 0911 0906 0 902 0898 0894 0 890 0 885 0 881 20 0 925 0920 0916 0912 0907 0903 0 899 0895 0 891 25 0 985 0930 0926 0921 0 917 0912 0908 0 904 0 900 30 0 944 0940 0935 0931 0926 092 0918 0913 0 909 35 0 954 0949 0945
41. conveniently control the speed of fans that create flow such as Blower Door Fans DucTesters and other flow devices It will also calculate the flow rate going through these devices as well as many passive devices such as flow grids Results can be displayed in any series of units used anywhere worldwide Words in square brackets indicate keys that must be tapped on the touchscreen to operate the gauge The ON OFF key must be pressed and held for two seconds in order to actuate while all other Touch Screen functions are Tap and Release to actuate EN speed ERES A o 50 2 7 2 A ACH 50 0 ex stop 5 Pa Seeking 50 00 Pa Figure 1 DM32 digital gauge has been turned on and is ready for action Page 9 of 96 Retrotec Inc 2014 2 Gauge overview The front of the gauge has a resistive touchscreen a touch sensitive Home button and a battery charge indicator light Because the screen is resistive it can be operated when the user is wearing gloves and in most environmental conditions The top of the gauge has four color coded pressure tube ports and a Control output port for fan speed The bottom of the gauge has an Ethernet network port for gauge computer communications a USB port mainly for battery charging and a Reset button recessed accessible using a paper clip The touchscreen serves as both the information display and the keypad for the gauge The information displayed depends on
42. d 5 s avg 1000 cu ft Figure 20 Enter a Volume if Result to be displayed is ACH The Volume key from the Home screen opens the same screen as the Settings gt Volume key combination 3 3 4 Tap Channel A to Hold readings and results Channel A also acts as a key so by tapping here the results can be frozen at the value in place when the key is tapped called Hold When active you will see Hold displayed and flashing in the Top Bar Hold allows the user to copy results down without them changing and flashing Changing the Result is even available when display is frozen using HOLD Page 26 of 96 Retrotec Inc 2014 55 0 speed HOLD 55 0 speed Ssavg lt A F 42 4 55 0 spe d 42 4 804 7 _ 42 4 3 m 5 c8 Y cso 5 5 STOP Figure 21 HOLD Result on display by tapping Channel A To remove HOLD and release the display tap again on Channel A or hit a Jog key D 550 speed E 42 4 ra Ty 4 e 804 7 E E 806 4 5 stop 5 ese HOLD 42 4 is Off Pa 804 7 3000SR Y so A 5 5 c8 Figure 22 Remove HOLD by tapping Channel A or a Jog key 3 3 5 Tap Channel B or Settings to change Result or units to be displayed Channel B acts as a key so by tapping it you can change the Result to be displayed at Channel B The Result to be displayed can al
43. d be 169 254 1 1 If so leave it and if not tap the Setttings gt Network IP Address key and use the numeric entry keypad to enter 169 254 1 1 iii For each subsequent gauge tap Setttings gt Network gt IP Address and use the numeric entry keypad to enter 169 254 1 2 then 169 254 1 3 and so on so that each gauge has a unique IP Address iv For all the gauges the Setttings gt Network gt Gateway default should be 0 0 0 0 If so leave it and if not tap the Setttings gt Network gt Gateway key and use the numeric entry keypad to enter 255 255 0 0 V For all the gauges the Setttings gt Network gt Subnet mask default should be 255 255 0 0 If so leave it and if not tap the Setttings gt Network gt Subnet mask key and use the numeric entry keypad to enter 255 255 0 0 Retrotec software FanTestic Virtual Gauge or Data Logger should be able to detect the gauges shortly after they are connected to the computer via Ethernet cable and the appropriate Network settings are chosen on the gauge If the white text on the Network key on the second Settings screen shows Not connected check that your settings are correct and then power the gauge off and back on 5 4 Connect computer or phone to the DM32 WiFi Hotspot The model DM32 can have a WiFi hotspot module included The gauge itself will generate a WiFi hotspot and act as a Rout
44. d of the tube and converting itself into a pressure at the tube end Wind velocity is always lower on the leeward side of the building Moving pickup points away from the windward side reduces the magnitude of wind induced pressures Wind velocity increases with height from the ground so placing our pickup points at ground level reduces the magnitude of fluctuations Covering the end of the tube without blocking it helps because the static pressure is reduced Pop bottles or other containers help Some testers dig holes to place the tube in All these methods work Flat plates on the ground work best because the openings face all directions and the pickup point is low down AT works well too Combining these methods gives a list you can go by if Baseline pressures are above 2 Pa or you simply want to increase repeatability Your outdoor pressure pickup tube should 1 Be 15 feet from the building 2 TerminateinaT 3 Have 2 pickup points at least 20 feet apart attached to either side of the T 4 Each point should be covered with a flat plate or box These steps will reduce the magnitude and variation of the Baseline pressures your gauge will see After that time averaging or long Baseline recordings will reduce the impact of these wind pressures Reduce uncertainty in results by taking lots of readings Table 7 shows tests with approximate uncertainties that can result from applying various number of Baseline points Baseline times and Tim
45. displayed white text indicates the firmware version first then the serial number of the gauge after the dash A computer with Retrotec s DM32 Configurator software installed is required to update the firmware version on the gauge For instructions see Retrotec s Manual Software DM32 Configurator 4 10 Re calibrate the touchscreen The re calibration process resets the internal mapping of the touchscreen to physical areas on the screen Re calibration thus ensures the correct functions will be activated when a user touches the screen in the area of the keys Each display varies slightly so the touch screen is calibrated at the factory before being sent out to the user but can change over time If you find that odd things are happening when you touch an area of the screen try re calibration You will need a stylus or some tool with a tip in order to tap with the most precision on the re calibration screens Version 1 Build 1 123456 None Taken Disabled 1 000 sq ft 1000 cu ft 5 seconds Flow CFM Figure 50 Start the re calibrate touchscreen process from the third Settings screen If the touchscreen does not seem to be responding properly to the user touch the screen calibration may need to be adjusted The Re calibrate touchscreen key allows the user to establish new points for touchscreen response coordinates as shown in Figure 51 Page 45 of 96 ORetrotec Inc 2014 settings Version 1 Build 1 123456 DM32
46. dle of a plastic dinner plate or smaller plate Tape the T to the concave surface of the plate which is the one that would normally be facing up Invert the plate on the ground so the plate covers the tube This will prevent the velocity from impinging on the end of the tube If further wind damping is required connect a T connector to the end of the outdoor tube and connect two other 15 foot tubes and then repeat the step of covering the tube ends with the plate This should work well and cost nothing Let us know what the result is Page 69 of 96 Retrotec Inc 2014 9 Technical Specifications l Channel Output dBm Dimensions I x WwW x h 14 7 x 9 2 x 3 5 cm p 5 79 x 3 62 x 1 38 in ET e ISM Band 2 400 to 2 484 GHz operation e Channels 1 11 e Application throughput 4500 kbps e 95 dBm Typical sensitivity at 1 Mbps e 18 dBm Typical 802 11b TX power with control e 16 dBm Typical 802 11g TX power with control FCC Certification Radio regulation certification for United States FCC Canada IC and Europe ETSI CE Certifications e EN 61010 1 2010 e EN 61326 1 Battery 4200 mAh LiPoly rechargeable Current draw WiFi DISABLED 371 mA and will last approx 11 hours on a single charge Current draw WiFi ENABLED 430 mA and will last approx 9 hours on a single charge Display Size Type 3 2 inch 8 2 cm QVGA touch screen display with backlight Microcontroller 32 bit Channels Sensor Type Di
47. e Averaging when taking induced pressures As the number of Baseline points the Baseline time and Time Averaging used for induced pressure readings increase the uncertainties decrease For example repeating the test using the same fan reduces the uncertainty by 5 in each case Typical uncertainties would be less than half of the values shown however the table exaggerates the uncertainty trend assuming there are errors while testing with different fans gauges and test conditions Table 7 Test result uncertainties vary by changing the number of baseline points the baseline time and Time Averaging for induced pressures Gauge Baseline Baseline Baseline Time Averaging for Uncertainty oe points time variation induced pressure 5 1 5S 1 5 Pa 5S 22 1 1 5 Pa 10s 8 6 1 5 30 10s 1 5 Pa 10s 7 9 1 Page 74 of 96 Retrotec Inc 2014 Page 75 of 96 Retrotec Inc 2014 Appendix B Flow Equations used with Devices The gauge can be used for testing either on its own or connected to a specialized calibrated fan which is identified on the gauge as a Device Read the Retrotec Manual Door Fan Operation which might also be called the Blower Door Operation Manual available at Retrotec s website for how to properly use Blower Door Test Fans as Devices Select the proper Device and Range in order to obtain the correct results The Device set on the gauge must match the Device in use for the test and the Range set on th
48. e gauge must match the Range Ring and Plate installed on the Device Refer to section 3 3 2 for instructions on how to select the proper Device and select the proper Range The gauge can be used with a Retrotec calibrated fan and other similar devices produced by other manufacturers The Retrotec Umbilical cable includes all necessary tubes and cable connections The pressure tubes in the Umbilical cable are color coded The pressure and hardware connection ports are also clearly labeled on the top of the gauge To connect the gauge to a Retrotec fan or variable speed fan drive 1 Locate the end of the Umbilical cable this is the bundle of pressure tubing and Control Cable with the shortest length of exposed pressure tubes and Control Cable Plug the yellow Control Cable into the Fan Speed Control port on the gauge 2 Plug colored tubes into the matching color coded pressure ports on the top side of the gauge Ensure the tubes are snugly connected to the ports Depending on the system Umbilical cable can contain red yellow green and or blue tubes 3 From the other end of the Umbilical cable plug the yellow Control Cable into the port labeled Control on the fan 4 Attach the yellow pressure tube to the yellow bulkhead fitting labeled Ref B fan on the fan If available the green pressure tube should be attached to the green bulkhead fitting labeled B on the fan 5 Pass the red pressure tube through the
49. e many holes that will have both turbulent and laminar flow going through them Duct holes tend to be slightly larger whereas houses have more prevalent long tiny cracks and therefore tend to have lower n values The Flow target Pa equation is used in the gauge Pressure function based on the values set for n in Settings gt gt Enclosure gt gt Enclosure Type and the Set Pressure target value in the gauge By using the O Pressure function the gauge performs the extrapolation for you if you are in the situation where you need a flow at a test pressure that cannot quite be reached The Pressure values should only be used if the pressure achieved is within 10 Pa of the required test pressure unless you have measured the actual n value for the building using a multiple point test and have entered that n in the gauge Page 84 of 96 ORetrotec Inc 2014 For example If we guess at the n value of a duct as being 0 6 and measure 100 CFM at 20 Pa by accident or by design then the gauge will complete the following calculation to estimate the flow at 25 Pa flow 20 Pa 200 6 If the test pressure 20 in this case is close to the desired reference pressure 25 Pa in this case then the correction is small and the value of n does not play as large a role However if the test pressure is much higher or lower than the reference pressure the error can be greater flow 25 Pa 25 x The Pressure feature is very
50. e re calibrate the touchscreen of the gauge if the touchscreen is not responding and the user cannot get to the Settings gt gt Re calibrate touchscreen option e change the gauge Auto Zero period Auto Zero period is set to 30 seconds by default e set the WiFi Join network name and password to join an existing secure network See Retrotec s Manual Software DM32 Configurator for details 5 1 Connecting gauges to a computer The Network connector on the gauge provides the most reliable connection from the gauge to a computer Up to 328 feet 100 m of Cat5e 6 Ethernet cable can be used for the connection between gauge and computer When the Network connector on the gauge is used the connection is called a Wired Network connection Connecting gauges to a computer via Wired network is recommended when e performing Automatic Tests using Retrotec FanTestic software e logging pressure data with the Data Logger software e controlling the gauge with the Virtual Gauge software 5 2 Connect single gauge to a computer with Ethernet cable Page 47 of 96 Retrotec Inc 2014 Computer reads and controls gauge using FanTestic Virtual Gauge or Data Logger software from Retrotec Figure 52 Use Network connector to connect a single gauge to a computer The Network connector on the gauge provides the most reliable connection from the gauge to a computer so this connector is recommended for connecting even a single
51. e tube cece ccesecccessecceeesseceeeeseceeeeneceeseees 66 8 14 Check if large fixed errors are caused by sun heating the tubes ccccesecccesssececeeseceeeeeeceeeeees 67 8 15 Check if wind is CAUSING fluctuating pressure inrer n 67 8 15 1 Use the Pressure key to reduce the effects Of wind cccecccceseceeeessceeececeeceeeneeeeeness 67 8 15 2 Use Time Averaging feature to reduce the effects of WIN ccccceeecccsessceecsceeceeeeseeenees 67 8 15 3 Let Time Averaging take effect before making readings cccccccssseccceesecceeeseceeeeeceeeeees 67 8 15 4 Use Baseline feature to reduce the effects of a constant wind cccccccsssseseseeeeceeseaeeeeees 68 8 15 5 In extreme cases you can use a Wind Damping Kit designed to reduce wind related TIRIGTUARIONS meat cias A a A a Ra a ANOR 68 9 Technical SOCCITICATIONS assess cessa sava sa Saca san 0H aaasdo dana di sines aan dss asa nis snoin eat 70 Appendix A Understanding Pressures on the Gauge ccccscsssscsssccsccccscescsceees 72 Diferential PrES ULG css ainda Gn ni is dy SD EPA EO Da DS 72 POSITIVE VS Negative Pre SULE setas is dna O sa SE opala 72 Why static and fluctuating pressures occur CAUSING DIAS ccccccccsseccccessececausececseeeceeeeeeceeseusecesseneceesenes 73 Managing fluctuating pressures created by WING ccccescccccssseccceesececeeececeeeecceseeecessunecesseeeceesensecetsuneses 74 Reduce uncertaint
52. each Pressure Cannot reach achieved 50 factor achieved 50 factor 1 00 1 57 1 01 1 03 1 04 Page 82 of 96 ORetrotec Inc 2014 Cannot Reach 25 Pa Factors Rather than using the equation in the situation where the 25 Pa test pressure cannot be achieved you can use tables with the factors already calculated and the following procedure Take a flow CFM reading at the pressure achieved and multiply by the Cannot reach 25 Pa factor from Table 11 to get an estimate of the flow that would result at 25 Pa For example if you read 600 CFM at a building pressure of 19 Pa the Cannot reach 25 Pa factor from the table is 1 18 Make the following calculation 600 CFM x 1 18 708 CFM Thus the estimated result for CFM at 25 Pa will be 708 CFM The factors depend on the n value chosen and Table 13 is for n of 0 6 which is typical for duct systems Table 11 Factors for when a building pressure of 25 Pa cannot be reached n value of 0 6 Pressure Cannot reach achieved 25 factor 25 1 00 4 1 02 1 05 1 08 1 11 1 14 1 18 1 22 1 26 1 31 1 36 1 42 1 48 1 55 1 64 1 73 Page 83 of 96 Retrotec Inc 2014 Appendix D Details about the Pressure extrapolation function There is a way to estimate the flow at a target pressure based on the measured pressure and flow you did achieve This procedure is the one the gauge uses to extrapolate flows with the Pressure key The following equation describes the relation
53. eed to be done manually A digital gauge therefore can save a lot of testing time with proper use of its functions Differential Pressure Each gauge contains two pressure transducers which each measure the difference in pressure between two ports The most common units of measurement are Pascals Pa but inches of water column in WC and pounds per square foot psf are also available Inches of water column is the easiest to visualize because one inch water column 1 in WC is the amount of pressure required to suck water up a straw toa height of one inch One inch of water column in WC 249 Pa 5 2 psf To measure a pressure Connect a pressure tube to the blue port of the gauge Press On Place the end of the tube into a glass of water slightly more than 1 inch below the surface The gauge will display around 1 00 in WC or 249 Pa or 5 2 psf depending on the units being displayed a LS o Units can be easily changed by tapping Settings gt gt Result to be displayed and tapping Pressure to change pressure units between Pa in WC and psf DM32 Dual Channel Digital Gauge 0 0 speed 250 5 0 3 Figure 71 Gauge displaying 250 5 Pa or 1 in WC Positive vs Negative Pressure The gauge will display pressures from 1250 Pa to 1250 Pa Page 72 of 96 ORetrotec Inc 2014 A higher pressure on the positive input port than on the negative ref port displays a positive pressure on the gauge Alte
54. er hour h e Equivalent leakage area extrapolated to 10 Pa EqLA10 sq ft sq in sq cm e Equivalent leakage area EqLA sq ft sq in sq cm e Effective leakage area EfLA sq ft sq in sq cm e Effective leakage area extrapolated to 4 Pa EfLA4 sq ft sq in sq cm e Equivalent leakage area per enclosure area at 10 Pa EqlLA10 area sq in sq ft sq cm sq m e Effective leakage area per enclosure area at 4 Pa EfLA4 area sq in sq ft sq in 100sq ft sq ft sq ft sq cm sq m The Channel B display is also a key when tapped the Result to display on Channel B will change In the list that shows up tapping a Result to highlight it in brighter red will select it as the displayed Channel B Result of choice Once highlighted the Result can be tapped repeatedly to cycle through all the different units available for display of that Result Refer to Retrotec s Residential amp Commercial Airtightness Requirements document for Results required according to various standards codes and regions 2 6 3 Set the Range Device connected to the gauge Device refers to the calibrated fan or other device being used to conduct the current test in conjunction with the gauge It is important to make sure that the correct Device is selected because the calculation for each of the Results is based on equations that are different for each Device Range or Range Configurations are the r
55. er performance from a single tube system Retrotec offers two wind damping kits specifically designed to reduce the pressure fluctuations due to wind The basic wind damping kit consists of a dual tube pressure averaging system and will work in wind conditions up to about 10 mph The deluxe wind damping kit our Wild Wind Tamer consists of a four tube engineered damping system that will provide damping results in winds up to 20 mph 1 Set up the house room gauge and red tube as normal Page 68 of 96 Retrotec Inc 2014 2 Connect the open end to the T connection on the basic wind damping kit connect the open tube to the output port on the deluxe wind damping kit 3 Place the wind damping tubes away from the building to avoid the pressure pulse that gets created when the wind hits the wall 4 Cover the end of the tubes with sheet material a box to stop the wind if required Figure 70 Wind damping kits basic left and deluxe right No cost wind damping procedure Overall what works best is to have one tube run to the outdoors with a T connector in the outdoor end connected to two equal length tubes that are placed as far away from the building as possible Place the outdoor pickup tube at least ten feet away from the building s wall and at ground level This will eliminate the stagnation pressure developed when the wind hits the wall If pressure is still too high place a T on the end of the tube and tape it to the mid
56. er so another device can connect to the gauge The gauge acts as a Router and Creates an unsecure WiFi hotspot wireless network with the Network name DM32 4xxxxx where 4xxxxxx is the gauge serial number The computer or smartphone then Joins the network that has been created by the gauge and the device can then talk to the gauge over the network The Retrotec GaugeRemote App runs on Android and iOS phones and can connect to the DM32 WiFi hotspot and control the gauge Details of the GaugeRemote App are found in the DM32 WiFi GaugeRemote manual Similarly a PC can connect to the WiFi hotspot being generated by the DM32 and if running the Virtual Gauge or Data Logger software or FanTestic can control and monitor the gauge Page 51 of 96 Retrotec Inc 2014 DM32W Gauge creates WiFi hotspot Computers and smartphones join connect to the hotspot DM32W Figure 58 DM32 creates WiFi hotspot for computer or phone to join To set up the DM32 to generate the WiFi hotspot 1 Tap Setttings gt Network gt Status until you see WiFi Create 2 Tap the Setttings gt Network gt Mode key until you see DHCP 3 Go back to the Home screen and you should see the WiFi icon in the Top Bar Figure 59 Disabled 0 0 speed 5 s avg Figure 59 Choosing WiFi Create or WiFi Join in Network Settings sets the Wireless icon in the Top Bar Not connected aiii Connections are available Wweless Network Connect
57. essure as displayed in Figure 69 Point the tube upward and the water drop falls back into the tube creating a positive pressure F DM32 Dual Channel Digital Gauge 0 0 speed 5 s avg 190 7 0 1 Figure 69 Water in the reference tube left high fixed pressure due to water right To fix this problem Page 66 of 96 Retrotec Inc 2014 e Whip the end of the tube around to remove excess water e If this doesn t work in extreme cases water can be blown out from the other end Be sure to not have the gauge connected when blowing water from the tube 8 14 Check if large fixed errors are caused by sun heating the tubes If air inside the exterior heats up due to the Sun shining on it and if the tube end is above or below the point where it leaves the enclosure a stack pressure will build up inside the tube that will create a steady pressure that may increase as the tube gets hotter 8 15 Check if wind is causing fluctuating pressure Wind blowing across the tip of a tube can cause significant error even if the tube is not moving High fluctuations of bias baseline pressures on the gauge greater than 2 Pa are a good indication that wind may be a large source of error Another thing to notice when the wind is blowing is that it is very difficult to establish the test pressure In windy conditions the house room gauge will fluctuate For example when trying to establish 50 Pa the wind will cause that pressure to go
58. gauge to a computer The gauge can be located up to 328 feet 100 m from the computer and the connector clip locks into the gauge so it is less likely to come loose Figure 53 Ethernet cable goes into Network connector on gauge for a Wired Network In order for the computer to find the gauge on its network the gauge Network settings must be configured To connect directly to a computer use the following Network settings e Status Wired e Mode Static e P Address 169 254 1 1 or your computer specific loop back address e Gateway 0 0 0 0 is actually ignored in this instance e Subnet mask 255 255 0 0 so only the bottom two values of the IP Address are used If you have not changed the Network settings from the default values then the required settings for direct connection to your computer will already be in the gauge as soon as you choose Network gt gt Status Wired as shown in Figure 54 Otherwise you will need to use the numeric entry keypads to enter the m tt values for each of IP Address Gateway and Subnet mask as shown in Figure 55 Page 48 of 96 Retrotec Inc 2014 Caddoom ro settings Disabled h Network settings Network settings Wired Wired DHCP Static Enabled Not connecte 169 254 1 1 0 0 255 255 0 0 0 0 0 0 255 255 255 255 0 0 Figure 54 Default Network Settings for direct connection to computer 169
59. ge so will not charge the battery When the gauge is plugged into mains power on a completely depleted battery it may take a few minutes to gain sufficient charge to have enough power to show the splash screen If you press the power button and the screen flashes without showing the splash screen this indicates the gauge is still in the process of gaining enough charge and will start shortly the gauge may also repeatedly run the Re calibrate touchscreen procedure when battery is too low Plugging the gauge into the computer when the battery is depleted will not provide enough power to restore the gauge it must be plugged into mains power The Lithium Polymer rechargeable battery provided with the gauge can last up to 3 years Once the battery becomes unable to hold a charge it must be changed Changing the battery will require return to the factory conveniently at about the same time that the gauge will need a factory re calibration 2 6 Use Keys on the Home screen to control gauge operation 2 6 1 Channel A Pressure Reading The Channel A display always shows the pressure difference between the blue pressure port input A and the red pressure port ref A If the pressure tubes are connected as illustrated in Retrotec s Door Fan Operation manual Channel A shows the building pressure The pressure units can be displayed in units of Pa psf or in WC To change the units for the Channel A Reading from the Home screen tap
60. gital Pressure Range 5 in WC 1244 Pa 0 1 Pa 0 0004 in WC 0 002 psf Pressure Resolution RoHS Compliant Temperature Battery life between charges compensated 0 C to 50 C Current draw WiFi DISABLED 371 mA and will last operating approx 11 hours on a single charge 40 C to 85C storage o g 40 C to 85C Current draw WiFi ENABLED 430 mA and will last humidity 0 to 95 RH approx 9 hours on a single charge Overpressure 150 in WC or 37 kPa Burst Pressure 150 in WC or 37 kPa Calibration interval 5 years Integrated WiFi Create Hotspot DM32W or Join DM32 Integrated Ethernet Yes Static IP or DHCP Serial Connection RS 232 via USB Pressure measurement rate 16 samples second RF EMISSIONS STANDARDS TESTED Test Method 4 3 1 Maximum Transmit Power 5 7 2 EN 300 328 V1 7 1 2006 10 4 3 2 Maximum EIRP Spectral Density 5 7 3 EN 300 328 V1 7 1 2006 10 4 3 3 Frequency Range 5 7 4 EN 300 328 V1 7 1 2006 10 4 3 6 Transmitter Spurious Emissions 5 7 5 EN 300 328 V1 7 1 2006 10 Page 70 of 96 Retrotec Inc 2014 4 3 7 Receiver Spurious Emissions 5 7 6 EN 300 328 V1 7 1 2006 10 Page 71 of 96 ORetrotec Inc 2014 Appendix A Understanding Pressures on the Gauge A high performance digital differential pressure gauge offers a number of advantages over analog counterparts e Easy to read e Pressure sensors have greater sensitivity e Performs calculations that would otherwise n
61. he gauge is reading between 2 and 5 Pa 5 Adjust Time Averaging to 20 seconds 6 Notice that after 20 seconds the gauge reading fluctuates significantly less 8 15 3 Let Time Averaging take effect before making readings While the Time Averaging feature is useful to help minimize the effects of wind it can also cause problems if not used correctly Whenever Time Averaging is on it is important to wait at least twice the time averaging period before taking a reading Page 67 of 96 Retrotec Inc 2014 To learn how Time Averaging can cause error 1 Create a pressure on the positive port of Channel A Input Set Time Averaging to one minute Wait until the pressure reading becomes stable After one minute Channel A should display the created pressure Remove the tube from Channel A eliminating the pressure 5 Notice that the gauge continues to display a pressure on Channel A which slowly decreases After one minute the gauge should display no pressure difference If a reading is taken from the gauge before the full time averaging period has passed then the displayed pressure may not be accurate 8 15 4 Use Baseline feature to reduce the effects of a constant wind The Baseline feature can be used to minimize the effects of Bias Pressures including that caused by wind if the wind is relatively constant This will reduce remove the bias caused by constant wind from the measurements but will not help with the fluctuating nat
62. her value for time averaging in seconds can be entered manually For details on time averaging see section 2 5 2 settings None Taken 1 000 sq ft 1000 cu ft 5 seconds Flow CFM 0 0 speed 5 s avg settings 0 a 2 None Taken Pa 1 000 sq ft 1000 cu ft 8 seconds Flow CFM Figure 44 Change time averaging depending on wind conditions Page 40 of 96 Retrotec Inc 2014 4 7 Change Result and units to be displayed 1 Tap Pressure to change the units of pressure displayed for Channel A and Channel B pressure readings All pressure result displays are converted to the chosen pressure units including the Baseline and Default Pressure Settings Disabled 1 044 psf Resulttr e displayed 1 Hour Enabled 0 0 speed 5 savi N N 35 wae 07 Flow normalized by area Psfwith 0 006 Baseline a sal Air changes per hour Flow normalized Equivalent Leakage Area at 10 Pa Air changes per h f Equivalent Leakag Flow normalized by area q Air changes per hour Equivalent Leakage Area at 10 Pa q Figure 45 Choose units of Pressure to display Pa psf in WC 2 Tap any other Result to select it for display on Channel B The Result to be displayed can also be changed by tapping the Channel B display on the Home screen See section 3 3 5 Page 41 of 96 ORetrotec Inc 2014 Flow normalized by area Flow normalized by area Air changes per hour Air changes per hour
63. ices do not require reference tubing the green tube for accurate results Whenever the gauge measures a positive pressure the fan flow is towards the greater pressure and the gauge makes the necessary deductions from the B Fan Pressure before calculating other results When showing pressure on B the value shown on the gauge for B is the actual measured pressure on channel B without deductions See Appendix C for more details Fans with two pressure tube connections yellow and green such as the Model 3000SR fans and the DU200 DucTester are self referenced and include a connection point for the green tube which must be connected Because these fans are self referenced the gauge does not make any adjustments to the Fan Pressure reading before calculating the other results It is important that the correct Device selected on the gauge since the chosen Device determines whether the gauge has to do any adjusting If a self referenced model fan such as the 3350SR series or the DU200 DucTester is in use the gauge knows not to adjust the fan pressure before calculating other results 8 11 Pressure can overshoot when using the Set Pressure key When Set Pressure is used to establish 60 Pa for example the fan can overshoot and reach up to 90 Pa for a few seconds before it settles back to the desired 60 Pa depending on the response time of the fan attached to the gauge If this is a concern start the fan on Set Speed or set to a lower
64. ine training and or reading all manuals and guides Failure to follow these instructions carefully may result in bodily injury damage to property and or equipment failure Failing to operate equipment as intended may void warranty and compliance with CE mark and other listings Page 8 of 96 Retrotec Inc 2014 1 Introducing the Retrotec DM32 series of digital gauge The DM32 is the next generation digital manometer with touchscreen and two digital pressure sensors It is a small lightweight dual channel pressure gauge with computer control options via USB or over a network via Ethernet The DM32 series utilizes the latest in microcontroller technology allowing the unit to support a rich set of capabilities including full color touchscreen display pre calibrated digital pressure sensors high capacity rechargeable Lithium Polymer battery onboard charging and power management USB connectivity and wired and optional wireless WiFi networking capabilities The DM32 includes a suite of software to maximize your use of the gauge The DM32 Software Suite for PC includes a Data Logger Virtual Gauge for remote control and the DM32 Configurator DM32 gauge internal software can be updated with new features as they get developed from time to time using the DM32 Configurator software and the USB connection on the DM32 WiFi enabled gauges also include the GaugeRemote App for Android and iOS based smart phones and devices The gauge will
65. ing a pressure in the building but in fact the results are way off If the gauge begins to display an unusually high or unexplained pressure check the tubing to ensure that it has not been compressed in any way e Be careful that no one steps on the tubes or creates a kink in any of the lines while performing a test If this happens wait a few seconds for the effects to subside before taking any readings from the gauge e Use the metal tube provided with the gauge to pass tubes through tight spaces such as under closed doors to prevent pinching 8 13 Check if large fixed errors are caused by water in the tube Water can also cause significant errors if a drop is pulled into the pressure tubes It is very easy to geta water drop inside the end of a tube Simply drag it over a shallow puddle of water and a drop of water will get pulled into the tube by capillary action Notice in the Figure 69 how one drop of water in the end of the tube is creating 190 Pascal pressure It is possible to complete a Blower Door test with a water drop in the end of the tube It will appear as if the fan is creating a pressure in the building but in fact the results are way off Particularly unusual behavior in the gauge could mean that there is water in the end of the tube Water can cause either a positive or a negative pressure based on which way the drop of water is pulling If a drop of water is facing downward it pulls out of the tube creating a negative pr
66. ings or plates installed on a calibrated fan to limit the air flow through it so that the fan can achieve a measurable Fan Pressure even when moving only a small amount of air for more information see Retrotec s Manual Door Fan Operation Select the Range that matches the Range Ring or Plate that is installed on the fan to ensure that the gauge performs accurate calculations and displays correct results Table 4 List of devices compatible with the DM32 Device Device displayed Description Manufacturer DucTester ae curves as 1000 Door Fan Same curves as 1000 self referencing have green tube 4000 Model 4000 systems with 2 1 5 hp fans in injection molded shells 5000 Model 5000 systems with 0 75 hp fans in injection molded shells and flow plates 6000 Model 6000 systems with 1 5 hp fans in injection molded shells and flow plates 0 75 hp black wheel rim style fan Page 17 of 96 Retrotec Inc 2014 Device Device displayed Description Manufacturer Exhaust Exhaust Fan Flow Meter measures air flow through residential exhaust fans between 10 and 124 CFM True Flow Grid measures flow through a residential air handler Hole Flow Plate with a hole of a known size Retrotec calibrated fans connected to the gauge with a Speed Control Cable can have their speed of operation controlled by the gauge through the Fan Speed control output Fans manufactured by TEC such as the DuctBlaster or Minneapoli
67. ion Open Network and Sharing Center 300 PM 11 23 2009 amp A E Figure 60 See the WiFi hotspot generated by the DM32 in the Wireless Network Connection panel on a PC To use the WiFi hotspot generated by the gauge Page 52 of 96 ORetrotec Inc 2014 1 Click on your PC desktop wireless icon to get a list of available WiFi networks the PC can join as shown in Figure 60 or follow the process on your phone to see all the available WiFi networks the phone can join Select DM32 4xxxxx where 4xxxxx is the serial number of the gauge 3 Connect to DM32 xxxxxxx Run the software you wanted to use with the WiFi connection to the gauge If your phone or computer cannot see the gauge hotspot as a choice of network ensure that the gauge has been set to WiFi Create in the Network settings and that the gauge and computer are not too far apart If your phone or computer can see the gauge hotspot in the list but cannot connect to the gauge ensure that no other device is connected to the gauge Ensure that there are no other DM32 gauges with Network settings set to WiFi Join and joining the hotspot in the vicinity if they are plugged in to USB mains or PC power the WiFi will be working as they will automatically join the hotspot and could prevent another device from connecting 5 9 Make the DM32 join an existing WiFi network Another possibility for the operation of the WiFi is to have the DM32 co
68. iting wind related fluctuations What does seem to work is taking the outdoor pressure pickup tube 25 feet away from the building and setting it in a flat area Cover the end of the tube with a heavy flat sheet of half inch plywood or place the tube into a box for example to reduce wind fluctuations It s never a good idea to leave a tube hanging in the air either between two points or out of a window The pressure tube should sit securely on the ground and be kept still as much as possible The effects of a moving tube are very similar to the effects of wind on a tube which is described below To see the effect of a moving tube Connect a pressure tube 10 feet or longer to the blue port of the gauge Set Time Averaging to one second Wave the end of the tube through the air Notice the fluctuations NP Hold the end of the tube still and swing the middle of the tube Notice the fluctuations Page 63 of 96 Retrotec Inc 2014 DM32 Dual Channel Digital Gauge 0 0 speed 5 s avg 5 9 0 3 Figure 67 The effect of a moving tube on pressure readings 8 10 Fans with a single tube have results adjusted by gauge When the gauge is connected to a fan with only a single pressure tube connection such as the Model 1000 2000 or 3000 fan fan pressures are adjusted in the gauge to compensate for the back pressure on the fan before being used to calculate flow or other results Since this adjustment is done by the gauge these dev
69. keys 3 3 5 Tap Set Pressure to achieve a particular enclosure pressure The gauge can achieve a target enclosure pressure entered by the user The gauge controls pressure by automatically adjusting the speed control output based on the pressure reading on Channel A Retrotec fans can be controlled directly from the gauge 0 0 speed 5 s avg 500 speed 5 s avg o 75 3 is Off 2472 1 AB Open v STOP 5 Pa Seeking 75 00 Pa Figure 17 Set gauge to achieve target pressure Fans manufactured by TEC can also be controlled if the optional Retrotec TEC speed control Adapter is connected between the gauge and the TEC fan as shown in Figure 12 Pressure tubing needs to be attached to the gauge using the Retrotec conventions described in the Retrotec literature Page 24 of 96 Retrotec Inc 2014 3 3 1 Tap Set Pressure 0 to achieve Zero Flow Hood pressure The gauge can achieve a target enclosure pressure or a flow hood pressure of zero The gauge controls to O pressure based on the pressure reading on Channel A If the pressure seen by the gauge is positive when Set Pressure to Zero is initiated then the Test Fan will speed up until the pressure is zero at which point it will stabilize If the pressure becomes negative the fan will slow down until it reaches zero If the pressure seen by the gauge is negative when Set Pressure to Zero is initiated then the Test Fan will speed up until that negative pressure is zero
70. lable software for PC e FanTestic software directs gauges to perform multi point pressure tests automatically in accordance to residential and commercial airtightness standard requirements or custom user settings while recording readings and calculating results FanTestic can also generate reports in Microsoft Word format based on a template that the user can customize See Retrotec s Manual Software FanTestic for details and download the software demo version e DM32 Software Suite includes the Data Logger Virtual Gauge and DM32 Configurator and can be downloaded e Data Logger software can be used to record Channel A and Channel B pressure readings to a spreadsheet file in real time Logging software can be used to record pressure values directly for research or analytical work See Retrotec s Manual Software Data Logger for details e Virtual Gauge software mimics the screens of the gauge on the computer or device and can be used to control the gauge functions from the connected device in the same way that the gauge would be controlled by tapping on its screen Virtual Gauge thus offers users a way to remote control a gauge from a computer tablet or phone using the same interface as provided on the gauge touchscreen See Retrotec s Manual Software Virtual Gauge for details e DM32 Configurator software can be used to e update the internal gauge software called firmware to get new features
71. lose to the target pressure As a rule of thumb extrapolation can be used if the actual enclosure pressure reaches at least 80 of the target pressure If 80 cannot be reached more fans are needed to complete the test See Retrotec s Manual Lge Multi Fan Testing Example 1 Inaccuracy A 50 Pa building pressure is desired but only 20 Pa can be reached due to severe leakiness In this instance the extrapolated results for flow 50 Pa do not represent the reality of the testing conditions and might be highly inaccurate In the same situation a 45 Pa building pressure is achieved The extrapolated 50 Pa pressure is now much more accurate and provides an acceptable result 2 6 5 n value for Pressure extrapolation The n value is a number set between 0 5 and 1 0 that is used in the calculation when extrapolating Channel B results to a pressure that is not the pressure read on Channel A It is pre set to 0 65 for houses and 0 60 for ductwork It is set by Model number Equipment designed for ducts is set to 0 60 except for the Model 451 which is set to 0 65 to conform to commercial duct Standards houses and buildings are 0 65 and open holes are 0 5 which is fully turbulent flow Devices with n 0 5 are Hole Flow Pitot Tube TEC Exhaust Fan Flow Meter and True Flow Grid Models with n 0 60 are Retrotec DucTesters 240 340 350 and TEC Devices DB Series 2 Models with n 0 65 are Retrotec DucTester 45
72. n the fan itself If a self referencing fan is the chosen Device then the fan includes a green port as well as the yellow port and the Fan Pressure signal sent to the gauge is always the correct value and never needs adjusting Setting the Device on the gauge to 3000SR or DU200 tells the gauge not to subtract the room pressure from the pressure value from Channel B before calculating flow Flow Self Referenced CFM FP RP x K1 x K FP x K3 x K4 Where FP is the fan pressure from Channel B displayed on gauge RP is the room pressure from Channel A displayed on gauge In all cases Page 78 of 96 Retrotec Inc 2014 The absolute value of FP must be greater than the minimum fan pressure MF shown in Table 8 and greater than the calculated factor using the K2 value from the table as follows FP gt RP x K2 To determine the flow for a particular fan pressure FP Check that the measured value for FP meets the two conditions based on MF and K2 If so find the N K K1 and K3 values in Table xxx based on the type of fan and the Range Configuration being used enter those values along with the values measured for FP and RP into the Flow equation stated above and calculate the result Table mae N and K rango for all gauge supported fans Es pw __ m fel oo a fr ee joao foma omo joz foo fe 10 osas sora 0000 os oo 10 38 PEETA eee AA a Josmo 264959 005 10 00 10 r q ae la 0 5000 78 5
73. ned by setting the gauge to display pressure on Channel B and reading the resulting pressure on the gauge when the room is at the test pressure Each fan and range combination has a different flow equation For each fan and range combination available the variables needed to calculate flow are listed in Table 8 The form of the flow equation depends on where the pickup for the Fan Pressure connected to the yellow ref B port on the gauge is located with respect to the green input B port of the gauge Case 1 Flow Away from Operator Page 77 of 96 Retrotec Inc 2014 If the flow of the fan is away from the operator holding the gauge then the gauge and the operator are on the inlet side of the fan Readings on Channel A in this case will always be negative measuring the induced pressure in the room Since both the fan pressure pickup and the reference for the fan pressure yellow port on the fan and green port on the gauge are on the inlet side of the fan Channel B will show the correctly referenced fan pressure and can be used directly as the fan pressure FP value in the following flow equation Flow Away from Operator CFM FP RP x K1 x K FP x K3 x K4 Where FP is the fan pressure from Channel B displayed on gauge RP is the room pressure from Channel A displayed on gauge Case 2 Flow Toward Operator If the flow of the fan is toward the operator holding the gauge then the gauge is on the exhaust side of
74. nel with respect to the other channel If the pressures are equal then it is likely the gauge is accurate because the chance of both channels being out of calibration by the same amount is very small Figure 65 Gauge field check configuration Cross port check input ports left and reference ports right To perform a cross port check Page 59 of 96 Retrotec Inc 2014 1 Set both channels to measure pressure in Pascals Pa Connect the Input port of Channel A to the Input port of Channel B using any tubing that you know is not blocked or pinched The measured pressure on both channels should be within 2 of each other 3 Disconnect the tubing and then connect the Reference ports of both channels using the same piece of tubing The measured pressure on both channels should be within 2 of each other The same procedure can be followed to compare two gauges Connect the tube between corresponding ports on two gauges as shown in Figure 66 The reading on both gauges should be the same eee e p Fan GIO Speed j Figure 66 Gauge field check configuration Cross gauge check When performing a gauge calibration with two gauges if one gauge is known to be calibrated accurately it can be used as a reference for the second gauge In that case the measured pressure on the tested gauge should be within 2 of the measured pressure on the calibrated gauge Page 60 of 96 Retrotec Inc 2014 8 What to do if you have t
75. nnect to the same wireless network to which the computer is connected described here as WiFi Join This connection requires a router or hotspot separately generated to which both the computer and DM32 can connect Disabled 75 Pa 1 Hour DHCP Enabled To use 3 S ture network connect the Not connected gauge to a PC via USB and run the DM32 Configurator software n 0 65 0 0 255 255 In the software choose the type of security enter the password and save settings to gauge 0 0 255 255 Set Setttings gt Network gt Status to WiFi Join Set Setttings gt Network gt Mode to DHCP Tap on the WiFi icon on the bottom right in the Network Settings Tap on Network Name SSID and enter the name of the network to join If the wireless network is not secure i e network does not need a password tap on Secure network to toggle the label to No and the settings are now complete If the wireless network is secure i e the network needs a password tap on Secure network to toggle the label to Yes and then the network password must be set into the gauge using a computer connected to Page 53 of 96 ORetrotec Inc 2014 the gauge via USB with the DM32 Configurator software on the computer For instructions on setting network password into the DM32 see section 5 5 1 The Static IP parameters for use with a wireless network are set up in the same manner as for a wired network de
76. nt a cause of problems when compared to blocked leaking or pinched tubes that happen more often and can yield errors of 10 to 90 Sending your gauge in for calibration does not address those problems but regularly carrying out this field check will Here is how to check the tubes to be sure they are not blocked pinched or leaking Checking each tube for blockage leaks or pinching and checking gauge calibration should be done weekly It only takes a few seconds Connect one tube between Channel A and B If the pressure readings displayed on Channel A and Channel B match within 2 both that tube and the gauge ports used are OK To perform a tubing check 1 Display pressure for Channel B see section 3 3 5 2 Tap Settings gt Baseline Clear Baseline to remove any captured Baseline 3 Tap Settings Time Averaging and choose 5s 4 Connect a tube between Channel A and B on the gauge e g yellow and red pressure tube ports 5 Check that the readings are within 2 6 Repeat with each tube between other ports as shown in Figure 64 7 Connect the yellow tube from the yellow to the red port on the gauge which should be set to Pressure on Channel B If the readings are within two percent and don t drop rapidly you have confirmed the yellow tube does not leak the tube and gauge is not blocked and the gauge has a 99 9 chance of being accurate Disconnect the yellow and connect the Blue tube from Blue to Green to check that tu
77. or read the gauge measurements via the computer Connect the USB A Micro B cable to a PC or the supplied AC power adapter in order to 2 USB cable port charge the internal battery of the gauge Connect the USB to a computer to update the software internal to the gauge firmware a Rese Press a paper clip into the hole to reset the gauge forces the gauge to turn off and back 3 on again 2 2 Charge the battery in the gauge The gauge is charged at the factory but you can plug it in to ensure a full charge before each test Connect the USB cable to the AC power adapter to charge the gauge battery Charging using the AC power adapter is the only way to fully charge the gauge Plugging the gauge into a computer USB port will extend the length of the charge but the gauge will eventually need to be recharged using the AC power adapter With the AC adapter a full charge will be completed in about four hours A fully charged gauge will last for approximately 8 hours without a recharge For details see 2 5 5 Warning The gauge may not operate properly when connected to a computer using USB if the gauge is not completely charged Computers and tablets can supply enough power to keep the gauge working but will not completely charge the gauge Page 11 of 96 Retrotec Inc 2014 Figure 4 Red light shows that gauge battery is charging When connected to the computer USB port the gauge still discharges very slowly Connection to
78. p mode Turning the gauge back On brings it out of sleep mode back to the Home screen In order to perform a hard reset and have the gauge run the splash screen requires the user to remove the USB cable from the gauge before pressing the power On Off key Situations where the user may need the hard restart include a recovering from an App failure where the gauge touchscreen has been Locked by the App or b changing between the Network types 8 7 Flashing yellow LED on front means gauge had an internal malfunction When the gauge is first powered on it will go through a self diagnostic check and check for any problems with any of the internal hardware modules of the gauge If an error is discovered in any module a flashing yellow LED will display instead of the red for charging or nothing for charged Details about the Page 62 of 96 Retrotec Inc 2014 malfunction may be displayed on the Diagnostic Screen and the gauge will not show the Home Screen when the gauge starts up If this happens have the gauge with the Diagnostic Screen showing malfunction details in front of you and call Retrotec at 1 360 738 9835 and ask for Technical Support to get help 8 8 Calculated Result will be wrong if the Range and Device installed on fan are different than those selected on the gauge If the results just don t make sense check to make sure the Range and Device selected on the gauge are the same as the Range and Device being
79. pe will be n The Flow equation is used in the gauge Pressure function based on the values set for n and the Set Pressure target value in the gauge By using the Pressure function the gauge performs the extrapolation for you if you are in the situation where you need a flow at a test pressure that cannot quite be reached The Pressure values should only be used if the pressure achieved is within 10 Pa of the required test pressure unless you have measured the actual n value for the building using a multiple point test and have entered that n in the gauge Page 81 of 96 Retrotec Inc 2014 Cannot Reach 50 Pa Factors Rather than using the equation in the situation where the 50 Pa test pressure cannot be achieved you can use tables with the factors already calculated and the following procedure Take a flow CFM reading at the pressure achieved and multiply by the Cannot reach 50 factor from Table 10 to get an estimate of the flow at 50 Pa For example if you read 1000 CFM at a building pressure of 30 Pa the Cannot reach 50 factor from the table is 1 36 Make the following calculation 1000 CFM x 1 39 1390 CFM Thus the estimated result for CFM at 50 Pa will be 1390 CFM The factors depend on the n value chosen and Table 10 is for n of 0 65 which is typical for houses Table 10 Factors for when a building pressure of 50 Pa cannot be reached n value of 0 65 Pressure Cannot r
80. quo ja Time averaging seconds A CA O A E ee 8 sq in 12 sq in 16 sq in 20 sq in 24 sq in 28 sq in 32 sq in Actual leakage area as measured 60Pa 60Pa 60Pa 60Pa 60Pa 60Pa 60Pa Press Set Pressure 92Pa 83Pa 71Pa 60Pa 60Pa 60Pa 60Pa Read peak pressure from gauge 34 33 32 37 49 61 76 Read peak speed from gauge 15 18 27 37 49 61 76 Read final speed from gauge If you believe you have a more severe problem with overshoot fill out the table below and send it to tech support Device 000 2000 30001 5 SSS SSS Rangetewcncn TSS Time averaging seconds Actualieakage area asmeasured PressisetPressuel Read peak ressurefomeaue Read peak speed from gauge Read final speed from gauge Set the correct Device on your gauge because it will calculate different results depending on which Device is selected 8 12 Check if large fixed errors are caused by pinched tubes A pinched pressure tube can create a very high reading on the gauge which is erroneous In other cases a pinched tube will prevent the pressure measurement from reaching the gauge at all In cases where tubes get stepped on they are seldom sealed off completely but will still cause the gauge readings to jump around Page 65 of 96 Retrotec Inc 2014 Figure 68 Errors in pressure reading from a pinched tube It is possible to complete a Blower Door test with a pinched tube It will appear as if the fan is creat
81. r hour Flow normalized by area Equivalent Leakage Are Air changes per hour Equivalent Leakage Area at 10 Pa Figure 25 Change Flow result units from CFM to cu m h 3 3 6 Tap Pressure to estimate Result at a different pressure When the gauge is controlling to a speed or pressure so that fan speed is not at 0 the gauge can extrapolate the Result and show a value for the Result that would have been achieved if the pressure on Channel A had reached a different value The different value mentioned is called the extrapolation pressure or O Pressure If setting speed the extrapolation pressure will be the Default Pressure the user can enter in the second Settings screen If setting pressure the extrapolation pressure will be exactly the target pressure If setting target pressure to zero then the gauge does not allow pressure extrapolation to be used For mathematical details on Pressure extrapolation see Appendix D For practical information on extrapolation see 2 6 4 Page 29 of 96 ORetrotec Inc 2014 Figure 26 Turn O Pressure on 55 0 speed 5 s avg 55 0 speed 5 s avg 42 4 gt 42 4 100 1 5 804 7 O e ee Y cso A 5 5 Figure 27 Pressure is not available when Pressure is the Result on Channel B 0 0 speed 4 S5savg 0 4 Figure 28 Pressure is not available when the gauge is not actively controlling a fan If Set Press
82. rapolation when Set Speed is used e select the inactivity time 15 min 30 min 1 h 2h Off after which the gauge powers itself down Power down time The gauge will not power itself down if Off is chosen e enable or disable Sound feedback upon key press e set an appropriate n value a slope for result extrapolation with Ducts 0 6 House 0 65 e update gauge firmware by tapping Firmware gt Update Firmware requires the DM32 Configurator software refer to section 6 e Reset touchscreen sensitivity with Re calibrate touchscreen For screen illustrations on using a function click the hyperlinks in the above list 4 1 Capture Baseline Pressure Measure and remove bias Baseline pressures due to wind or stack that are present before test pressures are applied The captured Baseline is subtracted from the pressure reading on Channel A 1 Tap Capture Baseline to begin sampling 2 Tap End Capture after 30 to 60 seconds The displayed Baseline pressure is now subtracted from all future readings on Channel A Page 34 of 96 Retrotec Inc 2014 0 0 speed 5 s avg 0 4 Settings Acquire Baseline Acquiring Baseline Pa 1 2 Pa None Taken 1 000 sq ft 1000 cu ft 5 seconds 30 seconds Flow CFM 1 000 sq ft 1000 cu ft 5 seconds Flow CFM Figure 35 Capture a Baseline 3 Tap Settings Baseline gt Clear Baseline at any time to clear the Baseline _0 0 speed Ssavg Acquire
83. re e Additionally this function is useful since the measured Channel A pressure will usually be slightly over or under the desired set pressure making it difficult to report results that exactly at the specified pressure Tapping Pressure will toggle the extrapolation function on or off The label under Channel B display will change to indicate whether O Pressure is On e g CFMO25 0Pa or is Off e g CFM Details of how the gauge calculates the flow at exactly the target pressure when Channel A has not reached exactly the set target pressure can be found in Appendix D e If the Set Speed function is used O Pressure extrapolates the Channel B result to the Pressure using the Default Pressure chosen in Settings using the n value associated with the Device selected Page 19 of 96 Retrotec Inc 2014 e lf the Set Pressure function is used O Pressure extrapolates the Channel B result to the pressure entered for Set Pressure using the n value associated with the Device selected The Pressure function provides unique advantages over non extrapolated results e There is no need to achieve an exact Channel A pressure e g to a precision of 0 1 Pa e Channel B Results can be obtained even if the test pressure cannot be reached Although the gauge can extrapolate results to any pressure it is more accurate when the actual enclosure pressure read on Channel A is c
84. rea type Results from Settings 4 3 Set Volume if using ACH The volume of the enclosure or building under test is required for the calculation of ACH Air Changes per Hour The Volume key will appear on the Home screen if ACH is chosen as the Result to be displayed Page 36 of 96 Retrotec Inc 2014 0 0 speed 55 avg 0 0 speed 55 avg Set volume 0 4 2925 cuft 0 3 Pawith0 3 Baseline Pawith0 3 Baseline 30005R 2 2 o 4000 cuft Figure 39 Set the Volume needed for ACH Result from Home screen The Volume key on the Settings menu provides another way to enter the volume of the enclosure or building under test Set volume Settings 0 3 Pa 29275 cu ft 0 3Pa 1 000 sq f 1 000 sq ft 1000 cu ft 2925 cu ft 5 seconds ACH Figure 40 Set the Volume needed for ACH Result from Settings The key on the Settings menu operates exactly the same as the Volume key on the Home screen but allows the user to enter the volume without changing the Result to be displayed to ACH to make the Home screen Volume key appear 4 4 Use metric units for dimensions The gauge determines if the user prefers entry of the dimensions using metric or imperial units based on the choice of units for Flow or permeability results If the Result to be displayed is Flow in CFM or any of the permeability results with imperial units then the dimensions need to be entered in imperial
85. reen will show as the device restarts Firmware versions prior to 1 1 7 ran the Re calibrate touchscreen procedure when the Reset was pressed but that was discontinued as it contributed to the problem discussed in Section 8 2 8 4 Flashing screen may appear as gauge recovers from deep discharge When the gauge is first plugged into power after the battery has been fully discharged it may take a few minutes to charge sufficiently to be able to show the splash screen If you press the power button and the screen flashes without showing the splash screen it means the gauge is busy charging and will start and show the splash screen shortly 8 5 Pressing power button may not turn gauge On if battery is fully discharged When the gauge is fully discharged pressing the power button will not start the gauge It is necessary to plug the gauge in to mains power using the USB cable and AC power adapter When the gauge is being charged a red light on the front of the gauge bottom right corner will be on solidly not flashing Once the light goes off the gauge is fully charged From the fully discharged state plugging USB into a computer will not provide enough current to charge the gauge must be plugged into mains power to re charge 8 6 Gauge will not reset run splash screen while gauge is plugged into power When the gauge is plugged in to power either mains or computer USB turning the gauge Off is actually just putting it into a slee
86. rev 2015 03 16 Pressure Gauge Operation Manual For Model DM32 retro Retrotec Inc Made by Retrotec Inc 1060 East Pole Road Everson WA USA 98247 For support Call 1 888 330 1345 in USA 1 360 738 9835 outside USA support retrotec com or Fax 1 300 647 7724 rev 2015 03 16 Set to zero added Section on n updated since no longer in Settings Page 2 of 96 ORetrotec Inc 2014 Copyright 2012 2014 Retrotec Inc All rights reserved This document contains materials protected under International and Federal Copyright Laws This book contains material protected under International and Federal Copyright Laws and Treaties Any unauthorized reprint or use of this material is prohibited No part of this book may be reproduced or transmitted in any form or by any means electronic or mechanical including photocopying recording or by any information storage and retrieval system without acknowledging Retrotec Inc as the original source Retrotec makes no warranties with respect to this documentation and disclaims any implied warranties of merchantability quality or fitness for any particular purpose The information in this document is subject to change without notice Retrotec reserves the right to revise this publication without obligation to notify any person or entity of any such changes Infiltrometer FanTestic and DucTester are Trademarks of Retrotec Inc Other Trademarks or brand names mentioned herein are trademarks
87. rnatively a higher pressure on the negative ref port than on the positive input port displays a negative pressure Measure a negative pressure 1 Connect a pressure tube to the red negative Reference port of the gauge Place the end of the tube into a glass of water about 1 inch below the surface The gauge will display around 1 00 in WC or 249 Pa or 5 2 psf Notice the negative sign DM32 Dual Channel Digital Gauge 0 0 speed 5 250 6 0 2 Figure 72 The gauge displaying a negative pressure 250 6 Pa Why static and fluctuating pressures occur causing bias Wind blowing across the tip of a tube will cause a significant pressure to appear on the gauge High fluctuations of bias baseline pressures on the gauge greater than 2 Pa are a good indication that wind may be a large source of error Another thing to notice when the wind is blowing is that it s very difficult to establish and maintain the test pressure In windy conditions the readings on the house room gauge will fluctuate For example when trying to establish 50 Pa the wind will cause that pressure to go up to 55 Pa and down to 45 Pa making it very difficult to take a reading There are other reasons a large Bias or Baseline pressure can appear on the gauge and these should be eliminated first before assuming wind is causing the problem If the tube is being moved by the wind a large rapidly fluctuating pressure will appear but can
88. rouble with the gauge Knowing the common causes of erroneous readings will increase your confidence in the results It is often assumed the gauge must be regularly calibrated in order to get accurate readings but this thought obscures the fact that most gauge problems do not result from incorrect calibrations The following list provides approximate percent probabilities based on our experience for certain types of gauge problems Notice that gauge calibration is one of the smallest and even that can usually be eliminated by following the gauge check procedures in section 7 this manual Table 6 Causes of common problems with gauges Error frequenc Error range Comments Problem caused by ee a ee Tub dehur 5 25 to 90 Usually noticeable because gauge does not move but the BPs Jere deen blockage may be partial which could cause an erroneous result Wisteria cabin 10 75 90 Possible only in wet areas If gauges sent in to be RES repaired or calibrated the water evaporates and the user never discovers the cause ne 20 to 90 Not common because the wrong Range Configuration Improper Device selected choices will likely be noticed on the gauge 5 to _ 50 Very common unless gauges checked before and after Improper Range Configuration each measurement to ensure the right Range is in use selected 5 25 Pressurization is seldom used but if the technician is Improper use of reference tube for an improperly trained they may not set the equipmen
89. s which are now Obsolete and not included in the gauge 39 4840 3 0110 1 1290 0 5280 372 5200 0 5000 104 6800 Retrotec 0 5000 54 0300 600 700 0 5000 24 1250 0 5000 8 2400 0 5000 4 0700 311 5000 366 8000 144 5500 97 4100 Retrotec 51 5800 800 900 30 4200 27 7100 17 2600 12 7100 5 7700 Page 80 of 96 Retrotec Inc 2014 Appendix C Manually estimate Flow if required test pressure cannot be reached If you have a situation where you cannot reach the required 25 or 50 Pa during the test there is a way to estimate the flow at that pressure based on the measured pressure and flow you did achieve This procedure is the same one the gauge uses to extrapolate flows with the Pressure key The following equation describes the relationship between the desired flow at 25 Pa and the measured values 25 Pa Flow 25 Pa Flow at measured pressure md rea measured pressure n 25 CFM CFMp For most ducts the n value is usually 0 60 For most houses the n value is usually 0 65 For large buildings the n value is usually 0 55 In the above equation substitute 50 for 25 if 50 Pa is the required test pressure The actual flow exponent n for an enclosure can be calculated by measuring building leakage at multiple pressure differences from 10 to 50 Pa and determining the slope of the line Flow K xPressure The graph of pressure versus flow will be linear if graphed on a log log scale and the slo
90. s Model 3 or 4 can be controlled by the gauge Fan Speed control output if an optional Retrotec TEC Fan speed control Adapter is connected between the gauge and the TEC fan in line with the Speed Control cable as shown in Figure 12 The Minneapolis fan speed control must have the cruise input Connecting the pressure tubing to your TEC fan as described in Retrotec literature allows the gauge to correctly calculate results AA Figure 12 Control a TEC fan using the gauge and Fan Speed Control Adapter part FN275 produced by Retrotec Table 5 Images of devices compatible with the gauge Biki 200 1000 yellow tube only 2000 yellow tube only Page 18 of 96 Retrotec Inc 2014 3000 yellow tube only 3000SR yellow and green tube LS lt e gt S Minneapolis go Duct Blaster Po MN BD3 amp 4 Exhaust Fan Flow Meter TrueFlow 2 6 4 Estimate Results with O Pressure The pressure key enables the gauge to calculate and display the estimated Channel B Result that would be achieved as if the target pressure was reached also known as extrapolation The Pressure key only appears on the Home screen if Set Speed or Set Pressure functions are used and the gauge is measuring pressures on Channel A and B e This function is useful in situations when the fan has reached 100 speed and the enclosure pressure still has not reached the target pressu
91. s of in PrB is the Channel B pressure is in units of Pa Page 92 of 96 Retrotec Inc 2014 Tip Box pressure of 8 Pa or less is recommended because higher pressures will decrease the exhaust fan flow rate Box pressures below 3 Pa are less accurate because small fluctuations in pressure will affect the flow a lot One Paisa practical limit for measuring flow below which readings cannot be taken Try the same fan with different holes to see the different results Page 93 of 96 Retrotec Inc 2014 Glossary E Term Neutrally buoyant smoke manufactured by Retrotec Inc used to locate leakage locations and to observe the direction of air flow or to see if pressure neutralization between two zones is reached Air Current Tester background pressure See Baseline pressure Baseline pressure Pressure that exists when the enclosure has been prepared for the test but before the fan is activated There is always some Baseline pressure due to stack wind flues and active HVAC systems There are two components of Baseline pressure A fixed Baseline offset usually due to stack or HVAC and a fluctuating pressure usually due to wind or elevator operation A method determining baseline pressure is by having a digital gauge accumulate readings over an adjustable time period Note The terms static pressure bias pressure and zero Fan Pressure difference are used interchangeably with the term baseline pressure in
92. scribed in section 5 2 Once the secure wireless network credentials have been set into the gauge using DM32 Configurator software the user should verify these credentials on the DM32 itself as described in section 5 5 2 5 5 1 Set secure wireless credentials using DM32 Configurator software DM32 Configurator 1 1 3 1 gauges will automatically appear Status WiFi Mac Address below WiFi Settings Network Name SSID Hostname Secure Network Password Advanced Security Firmware Version Calibration Date On Settings Firmware Update Figure 61 Use Gauge Configurator software to change wireless networking parameters Install the USB Device Driver if not already installed Connect the DM32 to a Windows based computer via USB cable Start DM32 Configurator software The DM32 gauge serial number should show up on list automatically and you should highlight the gauge s you want to configure Click the Network button one of the buttons along the bottom Choose WiFi as the Network Status Enter your WiFi router s Network Name SSID in the WiFi Settings section If secure click on Secure Network and enter your WiFi router s Password If necessary click Advanced and select your WiFi router s security type from the drop down choices default is fine in almost every case oa Se isa 10 Click Save to Gauge Ifyou want the same parameters entered into all gauges currently
93. selections a user makes by tapping on the touch sensitive areas on the screen called keys in this manual and shown in square brackets Zl Make connections to the gauge Physical connections from the gauge to a calibrated fan are on top of the gauge Physical connections to a computer or power adapter are on the bottom of the gauge An Ethernet style cable from the fan speed output control port connects to a calibrated fan to control its speed The cable supplied for this purpose with Retrotec systems is yellow Pressure tube ports on the top of the gauge are color coded to distinguish where pressure tubes are connected Retrotec has a specially designed pressure tube port that grips pressure tubes well but releases them without tearing after long term use This exclusive connector is designed by Retrotec to make contact with the both tube internally and externally with a shallow taper 2 6 9 6 ONO ma e Figure 2 Connect tubes and Speed Control Cable Table 1 Physical connections from gauge to fan are on top of gauge gauge port connection Fan Speed control cable port Connect the yellow Retrotec proprietary Speed Control Cable Bidepressure por pic Often has no pressure tube connected For duct testing a blue pressure tube 2 p part P leads from the gauge into the ducts u Connect the red pressure tube from the gauge through the Door Panel to the 3 Red pressure port ref B outdoors Yellow pres
94. ship between the desired flow at the target pressure and the measured values n target Pa Flow target Pa Flow at measured pressure measured pressure target CFMtarget CFMp The actual flow exponent n for an enclosure can be calculated by measuring building leakage at multiple pressure differences for instance from 10 to 50 Pa and determining the slope of the line Flow C xPressure The graph of pressure versus flow will be linear if graphed on a log log scale and the slope will be n The gauge uses the n value to extrapolate for flows at other pressures Because the extrapolation function is a ratio of two flows from the same fan the C value cancels out The n value is generally set to 0 65 for houses and 0 60 for ductwork Set to 0 5 for tests on the simulator air handler flow and any large hole that is not composed of long thin cracks A wide open hole has an n of 0 5 meaning that when the pressure is quadrupled the flow doubles That is due to completely turbulent flow going through that hole flow square root of pressure a constant for that particular hole flow Pressure An n value of 1 0 represents tiny little holes so small that the air would not be turbulent but rather would go through the holes as laminar flow This means that when pressure is quadrupled the flow will also be quadrupled flow Pressure flow Pressure 4 x flow 4x Pressure Houses and ducts hav
95. so be changed by tapping on Settings Page 27 of 96 Retrotec Inc 2014 55 0 speed Ssavg 42 4 Result to be displayed Result to be displayed Pa Equivalent Leakeage Area Effective Leakage Area Flow normalized by area Effective Leakage Area at 4 Pa Air changes per hour Normalized EqLA at 10 Pa Equivalent Leakage Area at 10 Pa Normalized EfLA at 4 Pa _0 0 speed 5 s avg Figure 23 Change Result to be displayed during operation Changing the Result to be displayed can occur even while the fan is running during Set Pressure or Set Speed so user can see multiple results for one fan speed setting Changing the Result is even available when display is frozen using HOLD 55 0 speed 5 s avg Result to be displaveor Resu to be displayed Flow normalized by area Flow normalized by area Air changes per hour Air changes per hour Equivalent Leakage Area at 10 Pa 55 0 speed Ss avg J 42 4 804 7 CFM A 5 Equivalent Leakage Area at 10 Pa Figure 24 Tap Channel B to change Result being displayed Each of the available results can be displayed with the user s choice of units Page 28 of 96 Retrotec Inc 2014 Flow normalized by area Flow normalized by Air changes per hour Air changes per ho Equivalent Leakage Area at 10 Pa Equivalent Leakage Flow normalized by area Air changes per hou Equivalent Leakage Area Flow normalized by are Air changes pe
96. sure port ref A Connect the yellow pressure tube from gauge to yellow port on a Retrotec fan Connect green pressure tube to green port on Retrotec fan if applicable No Green pressure port input A p P P pressure tube will be here if Retrotec fan does not have a green pressure port Pressure tubes should be clean and not stretched in order to make a proper connection If a pressure tube is damaged simply slice a short piece of tube off the end to ensure a clean fit Tubing can crack in cold weather but can Page 10 of 96 Retrotec Inc 2014 be heated in hot water before being handled Be careful to dry all water from the tubing prior to connecting since water in the tube is a major source of measurement error Connections on the bottom of the gauge provide a USB charging input and remote control port as well as an Ethernet remote control port An Ethernet cable of type Cat5e or Cat6 from the Network port can connect the gauge directly to a PC to an Ethernet switch or to a router Ethernet cables have a maximum length of 328 ft 100 m over longer lengths signal strength may be compromised Figure 3 Connect charger or remote computer control Table 2 Physical connections from gauge to a computer or charger are on the bottom of gauge i gauge port connection A Cat5e or Cat6 Ethernet cable can connect the gauge to a computer a switch or a router 1 Network cable port in order to control fan and
97. t pressure Page 13 of 96 Retrotec Inc 2014 2 5 Observe icons on Top Bar to monitor gauge status Icons on the Top Bar indicate the current status and various settings on the gauge 83 0 speed 55 ave Cd Figure 9 Top Bar 2 5 1 What speed is being sent to the fan on the Fan Speed output The Speed indicates the percentage of the fan s total speed capacity that the gauge is directing the fan to achieve 85 Fan Speed shown in the example above 2 5 2 Over what time period is the Result being averaged When Time Averaging is active the gauge will display the time that the Channel A and Channel B Readings are averaged over 5 second Time Averaging is shown in Figure 9 Regardless of the time averaging setting the display will update every second Time Averaging periods of 1s 5s 10s 30s can be selected directly or another time to spend averaging can be entered manually Tip When changing the fan speed set pressure or taking a reading after making any other changes wait for twice the Time Averaging period to elapse before taking a reading Taking a reading too quickly can lead to recording incorrect results 2 5 3 Result display can be frozen to write down values When the Channel A Reading is tapped HOLD will instead be displayed and flashes in place of the Time Averaging value to indicate Channel A and Channel B display values are frozen to the values that were present when the display was
98. t up pressuniza properly for this test 25 5 to 10 If the gauge is fluctuating too much it will be difficult to Time averaging set too high or too aaa read If the time averaging is too high the pressure may ov have changed but that change is not reflected in the reading Wind 10 These errors can be eliminated by long term averaging or di by multiple pressure pickups ni 1 50 Gauges can go out of calibration in a week or may take 10 Out of calibration E years It is impossible to tell unless the readings seem unreasonable 0 5 1 2 Regular gauge checks can eliminate most of the Out of calibration with regular Na calibration problems by identifying large errors checks immediately and before erroneous test results can be taken It is unlikely that errors in excess of 2 would occur if the gauges checked before each use Proper training can eliminate almost all of the above errors 8 1 Re calibrate touchscreen if keys don t respond well to taps If the soft keys on the touch screen seem not to be responding to the user touch the screen calibration may need to be adjusted The Re calibrate touchscreen key allows the user to enter new corner points for the touch screen to re calibrate the screen The calibration process can ensure the correct functions are being activated when a user touches the screen in the area of the keys Each display varies slightly so the touch screen is calibrated at the factory before being sent
99. tapped HOLD Figure 10 Tapping Channel A display area will HOLD the Result 2 5 4 Is the gauge connected to a Network The wired network icon 9 appears when the network Status is set to Wired Settings gt Network gt Status Set Wired when an Ethernet cable is connected to the Network cable port on the bottom of the gauge For a DM32 with WiFi capability enabled the WiFi icon appears when the network Status is set to one of the WiFi choices and the gauge successfully connects to the associated wireless network Set WiFi Create to have the gauge generate a WiFi hotspot to which a phone or computer can connect or set WiFi Join to have the gauge connect to an existing WiFi network See section 5 4 for full instructions on connecting your DM32 to a WiFi network Gauges with serial numbers starting with 4 have WiFi capability which can be enabled if the WiFi module is purchased Warning The gauge may not operate properly when connected to a computer using USB if the gauge is not completely charged Computers and tablets can supply enough power to keep the gauge working but will not completely charge the gauge Page 14 of 96 ORetrotec Inc 2014 2 5 5 How much battery life remains The battery life indicator shows how much life is left in the rechargeable battery inside the gauge A fully charged battery will last approximately 8 hours before needing recharging Gauges will discharge fas
100. ter Customer supplied Router s create Network s DM32 or DM32W Gauges join the Network wired connection Computers join connect to the Wired or Wireless Network Wireless Wired Network Wireless Switch The customer supplied Switches group gauges so they can be connected via a single wire to the router or computer Figure 57 Multiple gauge connection and networking possibilities with the DM32 To connect the gauges to a computer via Wired network 6 1 Connect one end of a Cat5e or Cat6 Ethernet cable to the Network port on the gauge 2 Repeat for each gauge 3 Connect the other end of each of the Ethernet cables to its own port on the switch router 4 Connect a Cat5e or Cat6 Ethernet cable from the switch router to the Ethernet port on the computer Page 50 of 96 Retrotec Inc 2014 5 On each gauge tap Setttings Network gt Status until you see Wired Setttings gt Network gt Mode depends on whether the network device is a Router or a Switch a If using a Router Tap the Setttings gt Network gt Mode key until you see DHCP This is all the network configuration required since the Router will provide the other values shown in the Network settings screen b If using a Switch i Tap the Setttings Network gt Mode key until you see Static on each gauge ii For the first gauge the Setttings gt Network gt IP Address default shoul
101. ter if WiFi is being used To extend battery life choose a Network setting of Disabled The gauge battery is charged via the USB cable port on the gauge The fastest way to charge the gauge is to plug the USB cable into the provided USB to mains AC power adapter as the mains adapter will provide maximum current Plugging the USB cable into a USB port on your computer will also charge the gauge but at a much slower rate and will only extend the length of time before needing to use the AC adapter the draw can be higher than what most computers normally provide on the USB output Figure 11 AC Adapter provided to charge battery via USB connector Table 3 Gauge battery life indications Battery life Electrical Battery life L i ee remaining Potential indicator icon aa DM32 is Charging USB from DM32 is connected to power Page 15 of 96 Retrotec Inc 2014 When the battery is charging a red light on the front of the gauge bottom right corner will be on solidly not flashing Once the light goes off the gauge is fully charged Additionally the battery life indicator on the Top Bar will be blue when the battery is being charged and the gauge is powered on With the gauge plugged into the wall outlet the battery charges at 1A and will take approximately 4 2 hours to fully charge a depleted battery With the gauge plugged into the USB port of a computer it charges at around 500mA not enough to maintain the gau
102. th calibrated fans and calculate results for air leakage testing In this manual words that are in square brackets indicate keys that can be tapped to change something on the gauge Page 12 of 96 ORetrotec Inc 2014 Network Connection type Disabled None Wired el o wir Es Set Pressure change speed control signal until pressure on A reaches the target pressure Area or Volume key disappears when not available Settings change parameters in gauge retrieved even after gauge has been powered off Message Display Area Home tap to return to this screen or press to turn gauge on or off DM32 Dual Channel Digital G2uge Figure 7 Home screen keys when the gauge is idle not controlling a fan Fan Speed indicator Time averaging setting or HOLD DM32 Dual Channel Digital Gauge Network Connection type Disable None Wired 5 or WiFi Battery life indicator Pressure key disappears when not available Channel A label showing units of pressure and if a Baseline is being applied to all readings Channel B Tap to change the Result to be displayed even during a test Jog Down Change speed control output to seek a lower speed or pressure Stop Stop attached device by setting speed control output to zero Jog Up Change speed control output to seek a lower speed or pressure Message Display Area Home or press to turn gauge on or off Figure 8 Home screen keys when gauge is seeking a targe
103. the computer USB is just a way to extend the time available on a charge so that you can run longer tests if you have a computer nearby 2 3 Power the gauge on and off press for 2 seconds Warning Gauge does not turn on immediately You don t need to press the screen overly hard You may break the glass DM32 Figure 5 Gauge Home key and power on off key Press the power on off key and remove your finger After two seconds you will hear a click as the gauge starts up then the Splash Screen will be displayed Press on off for 2 seconds to power off Touch the screen to continue The Splash Screen is visible until the user taps anywhere on the screen or until the gauge self check sequence finishes and automatically displays the Home screen Figure 6 DM32 splash screen shows while gauge starts up Information displayed on the Splash Screen during start up includes e Internal gauge software Firmware Build and Version Number e Gauge Serial Number Upon gauge start up the Home screen will display the Device Range and Result to be displayed settings that were set on the gauge before it was last powered off so the user can immediately start testing if they are using the same equipment 2 4 Read Results and control the gauge from the Home screen The Home screen is the main display that allows a user to control the gauge The gauge includes convenience functions to support operation of pressure measurement systems wi
104. tion To ensure compliance operation at closer than this distance is not recommended The antenna s used for this transmitter must not be co located or operating in conjunction with any other antenna or transmitter This device complies with Industry Canada license exempt RSS standard s Operation is subject to the following two conditions 1 this device may not cause interference and 2 this device must accept any interference including interference that may cause undesired operation of the device Le pr sent appareil est conforme aux CNR d Industrie Canada applicables aux appareils radio exempts de licence L exploitation est autoris e aux deux conditions suivantes 1 l appareil ne doit pas produire de brouillage et 2 l utilisateur de l appareil doit accepter tout brouillage radio lectrique subi m me si le brouillage est susceptible d en compromettre le fonctionnement Page 3 of 96 Retrotec Inc 2014 Table of Contents Important equipment related SAFEQUAFS cccccccsssecccesecccceseccceeescceceusececsuseceeeeeecceseuecessenecesseneceeseneeeetas 8 1 Introducing the Retrotec DM32 series of digital gauge csccccsceccscecsscsees 9 2 GAUSS OVOIVIEW orons osn Gta s asia sd renas andas iss anais iai ins soca nan acaso 10 2 1 Make connections to the DANDO apos nais Oi a 10 2 2 Charge the battery in tne Sau e Cx sixiccstcateGarsac accel cite ineaace AR salto ohio wane 11 2 3 Power the gauge on and off
105. ton below to check for firmware update and download if available Firmware Version Calibration Date Network Firmware Update Figure 62 Use Gauge Configurator software to update the firmware in the gauge 6 1 Connect the gauge to a computer via USB lt Using the USB connection to connect the gauge to a computer is necessary when e updating the internal gauge software called firmware to get new features e changing gauge settings for the Auto Zero interval e re calibrating the touchscreen if the gauge touchscreen is inoperable Connect the gauge to a Windows based computer directly via USB cable between the USB port of the gauge and the USB port of the computer A USB hub can be used if you are using more gauges than there are number of USB ports on the computer Tip Only four levels of nesting are allowed with USB so if you are connecting a large number of gauges with multiple hubs you may need a hub with a larger number of ports to prevent chaining more than 3 hubs Page 56 of 96 ORetrotec Inc 2014 settings Disabled Enabled Figure 63 Disable Network connection if using USB connection to a computer Settings Network gt Status must be set to Disabled if the gauge will be connected to the computer with a USB cable since this direct connection does not involve a network When Network is Disabled the gauge will not show a network connection icon on the Home screen Communication between
106. ture is very useful for ensuring that results taken when the pressure was not adjusted perfectly are still accurate To continue the above example The flow at 20 Pa is 100 CFM Actual n is 0 7 but this is unknown Instead 0 6 will be used The gauge would calculate Flow 25 Pa 25 x CFM OW a 201 2506 x 100 Flow 25 Pa 2006 Flow 25 Pa 114 CFM However if it was known that n was 0 7 the flow at 25 should have been 25 x 100 209 7 Flow 25 Pa 117 CFM Flow 25 Pa This value is less than 3 off from what it should be If the test pressure was within 1 or 2 Pa of the reference pressure of 25 Pa the Pressure reading would be exact Errors occur in estimated flow if gauge and actual n don t match If a gauge has the extrapolation or flow exponent n set to an assumed value but the actual exponent a true measured exponent value for the building differs the flow values estimated by the gauge when using the Pressure feature will be off by an error amount The tables below show the percent error that can result from entering an incorrect exponent value in the gauge and using the Pressure function If the n value on the gauge is set to 0 65 and the actual enclosure n is different a small error as shown in Table 12 will result if the Pressure function is used at the Achieved Pressure to estimate result at 50 Pa Page 86 of 96 Retrotec Inc 2014 Table 12 Errors in Estimated Flow at
107. uipment is used in a manner that does not follow the information provided in this manual safety to the operator and equipment performance may be impaired The risk of fire electric shock and injury to persons may result during cleaning of the gauge To avoid these risks unplug or disconnect the gauge from the electrical power supply and turn the gauge off before cleaning Clean only by wiping with a soft dry cloth There are no user serviceable parts on the gauge To protect against the risk of fire electric shock and injury to persons during gauge operation Do not operate any gauge with a damaged electrical cord Discard gauge or return to an authorized service facility for examination and or repair Do not run power cord under carpeting Do not cover cord with throw rugs runners or similar coverings Do not route cord under furniture or appliances Arrange cord away from traffic and where it will not be tripped over Do not place this equipment or power cord in water or other liquid Use only the included power plug to charge and or operate the gauge Turn the unit off and unplug the charger if in use from electrical outlet before moving For use under indoor conditions only where there is no exposure to water or dusty substances or explosive materials or flammable materials Do not use equipment for other than its intended use Equipment is intended for diagnostic testing and the operator must be qualified by taking Retrotec onl
108. units If the Result to be displayed is Flow in metric units or any of the permeability results with metric units then the dimensions need to be entered in metric units Page 37 of 96 Retrotec Inc 2014 Settings 0 3 Pa 450 sq m 262 cum l 262 cu m 5 seconds 5 seconds Flow Area cu mihj sq m Flow Area cu m hj sq m Figure 41 Set Area using metric units when Result is displayed in metric units The choice of metric or imperial for Volume units follows the last chosen Flow or other Result using area 0 0 speed 35 avg 0 1 Pawith0 3 Baseline Pawith0 3 Baseline Figure 42 Set Volume using metric units when other Results are displayed in metric units 4 5 Set the Default Pressure If the Set Speed function is used and Pressure is On the Default Pressure that is chosen with this Setting will be the reference pressure for the Result displayed on Channel B that is extrapolated and displayed see section 3 3 6 Page 38 of 96 Retrotec Inc 2014 Settings None Taken Disabled 1 000 sq ft 50 Pa 1000 cu ft 1 Hour 5 seconds nabled Flow CFM n 0 65 0 0 speed Disabled 25 Pa 1 Hour Enabled n 0 65 Figure 43 Set the default pressure to be used as extrapolation pressure during set speed operation Page 39 of 96 Retrotec Inc 2014 4 6 Set Time averaging period Time averaging of 1s 5s 10s 30s can be selected directly or anot
109. ure function is used e Tapping Pressure so that it is On extrapolates the Channel B Result to the Set Pressure target entered using the n value specified in the second Settings screen e Tapping a Jog key so that target pressure changes causes the Pressure label to change as well Page 30 of 96 Retrotec Inc 2014 5 s avg 68 3 6508 6 3000SR Open Y so A 5 Pa 5 Pa Seeking 75 00 Pa Li 100 0 speed 55s avg o 68 1 is On 6927 6 Open CFM 75 bA STOP 3 Pa Seeking 75 00 Pa Disabled 50 Pa 1 Hour Enabled n 0 65 Figure 29 Pressure extrapolates to the target pressure when a pressure is set seeking 73 00 Pa 100 0 speed 35 avg Figure 30 Jogging pressure while using Pressure changes target and pressure label If Set Speed function is used e Tapping Pressure so that it is On extrapolates the Channel B Result to the Default Pressure using the n value both set in the second Settings screen Page 31 of 96 Retrotec Inc 2014 10008 sed a 100 0 speed 35 avg 42 3 j Pa is On is off HIS 6466 9 Open 7201 5 Open CFM 50 f MOO Settings MARS ro 5 5 5 Disable 50 Pa 1 Hour Enabled n 0 65 Figure 31 Pressure extrapolates to Default Pressure when a speed is set e Tapping O Pressure so that it is Off will
110. ure of wind which is the biggest issue Baseline exercise to practice minimizing the effects of wind Use a fan to create an air stream that causes between 2 and 5 Pa pressure Set Time Averaging to one second Place a tube connected to the positive port in the path of the air stream Establish a Baseline pressure Ch ae ee Notice that once a Baseline pressure is taken the measured pressure drops closer to zero negating the effects of the wind on the actual measured pressure Stop the fan 7 Notice now that the measured pressure is negative even though no pressure is being received gt by the gauge With the Baseline feature still active the gauge is compensating for a pressure that does not exist Clear the baseline reading to eliminate this error 8 15 5 In extreme cases you can use a Wind Damping Kit designed to reduce wind related fluctuations In extreme cases wind damping kits split the main pressure pickup point into either two or four directions which will average the fluctuation across the building Recent experience has shown that longer time averaging on a digital gauge is almost as effective as the four tube wind damping kit When the time taken to set up the kit is taken into account increasing the time averaging will actually save time A wind damping system averages out pressure fluctuations created by the wind yielding a more stable pressure reading In addition to a number of suggestions for obtaining bett
111. used Each Device and Range configuration has its own individual parameters that are used to convert Fan Pressure into flow and the other results selected for display on the gauge If a test is completed with the incorrect Range selected it is possible to salvage the data by using the customized flow charts provided in Appendix F To determine correct flow if Range selected was different than the actual Range used Select the Fan Pressure reading for which a corrected flow value is needed Find this Fan Pressure value in the left column of the flow conversion tables in Appendix F Move across the row and record the flow value beneath the column heading with the actual Range that was used Note Retrotec 1000 2000 and 3000 series fans have the same flow curves 8 9 Moving tubes might cause fluctuating pressure readings lf the measured values on Channel A or B are fluctuating back and forth in a way that doesn t correspond with any of the current testing conditions it s possible that the pressure tube is moving A moving tube can cause a Significant error For instance a tube that is attached both to the gauge and to the fan but is in the path of the fan s air flow can swing back and forth This swinging motion can easily cause fluctuations in the measured pressure Outdoor pressure tubes need to be sheltered from the wind In spite of standards that require tubes be attached to walls this strategy does not work particularly well for lim
112. useful for ensuring that results taken when the pressure was not adjusted perfectly are still accurate To continue the above example The flow at 20 Pais 100 CFM Actual n is 0 7 but this is unknown Instead 0 6 will be used The gauge would calculate Flow 25 Pa 22 XCEM OW a 201 259 6 x 100 Flow 25 Pa 2006 Flow 25 Pa 114 CFM However if it was known that n was 0 7 the flow at 25 should have been 25 x 100 2094 Flow 25 Pa 117 CFM Flow 25 Pa This value is less than 3 off from what it should be If the test pressure was within 1 or 2 Pa of the reference pressure of 25 Pa the Pressure reading would be exact n value for Pressure extrapolation The n value is a number set between 0 5 and 1 0 that is used to extrapolate Channel B results to a pressure that is not the pressure read on Channel A It can be changed by tapping Settings gt Ducts 0 6 House 0 65 Set it to 0 65 for houses and 0 60 for ductwork Set to 0 5 for tests using the Retrotec House or duct simulator air handler flow and any large hole that is not composed of long thin cracks A wide open hole has an n of 0 5 meaning that when the pressure is quadrupled the flow doubles That is due to completely turbulent flow going through that hole flow square root of pressure a constant for that particular hole flow Pressure flow Pressure An n value of 1 0 represents tiny little holes so small
113. ust pressure UP OF down 5 Pa ou eeccccessscccceeseccceeeceeeeecceeeusececeeneceesenes 25 3 3 3 Tap Area or Volume to enter dimension for particular RESUItS cccccceeccceeeseeeeeseeeeees 25 Page 4 of 96 Retrotec Inc 2014 3 3 4 Tap Channel A to Hold readings and results cccccccscccesecceceececeneceeeeceseeecsseueseeeeeeeeuses 26 3 3 5 Tap Channel B or Settings to change Result or units to be displayed 27 3 3 6 Tap O Pressure to estimate Result at a different pressure cccccccceececeeececeeeseeeneseeenees 29 4 Change Settings for gauge operating ParaMeters cccccsccccssssceccsccccecceces 34 4 1 Capture Baseline PRESSURE sais ato Lose io Sina S Da a Si tala 34 4 2 Set Area if using a Result per ATES gas sisssa lost fio lsdeisio bia alas diacaeasadeidevebsdeasbanndeanbbecgastaaneadaradooes 35 4 3 Set Volume 1 usine ACH ess sata o a ates wien sd ouetoniae N 36 4 4 Use metriciunitS TOF dIMENSIONS assiste ada isto os Rai ato Sd a 37 4 5 Set TNE Del AU Pressure suas os IDR A Ra do 38 4 6 Set Time ia Vera ing DEO nesso teat denaltdeanat cab edancin asain Calva tiualh A 40 4 7 Change Result and units to be diSplayed cccccsssccceesseccccesecccceesececeeececeeeeceeeeeeecessuaecessueceeseees 41 4 8 Set up Network if using Ethernet connection cccccceeeccceececeeececeecsceecseeeeeeeeceseueceteneceneneeees 43 4 9 View and update the
114. y in results by taking lots Of readings cccccceesccesecceeeececeecseeeceeenesseenceeeueceesueeeeeness 74 Appendix B Flow Equations used with DeVICES ccccccsssssscscsscsccccsceccscescsceees 76 Appendix C Manually estimate Flow if required test pressure cannot be reached BRR SAR RR SUE e IE DRE SE ER NUDE E SAR DDD E MPR E PR qe DREAM A DOR RESP ERR SO TER E SU 81 Cannot Reach SO Pa FAC CONS nas a e da a Sa 82 Cannot Reach2 a Factors sadia saia E pl add a EE 83 Appendix D Details about the Pressure extrapolation function 84 nValue for O Pressure extrapolatioN cisaieesscncsconciagiees cave obed A Ra Daian A a 85 Errors occur in estimated flow if gauge and actual n don t Match eeecccsssseccceeseceeeeecceeaenececeeneces 86 Appendix E Tables to adjust Flow values for temperature difference 89 Appendix F Tables to correct Flow if range selected did not match the installed ANE amis nina E aan irreais AAE E A E A E 91 Appendix G Measure Supply or Exhaust flow with a gauge and box 92 Page 6 of 96 Retrotec Inc 2014 GOSS ANY wicca niscviaceancewetsatnicase aan varevaassenncuanecacauiesosnadaaiatesesedeseancanasecmesveresieewaeeuneanes DA Page 7 of 96 Retrotec Inc 2014 Important equipment related safeguards Read and save these instructions When using electrical appliances basic safety precautions should always be followed If Retrotec eq

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