Manual - Keison Products
Contents
1. o O Figure 5 The Microtherm Heat Stress WBGT installed in the fitted carying case Page 12 of 44 00064 MICROTHERM Heat Stress WBGT amp Operation WinHSM Application Software User Manual 2 OPERATION The Microtherm Heat Stress WBGT is a sensitive scientific instrument which should not be exposed to excessive moisture vibration or physical shocks The following steps must be performed before your Microtherm can be used under operating conditions It is suggested that you follow the sequence of sections in this chapter 2 1 Preparation for Use 2 1 1 Power Supply Infrared Interface l 12 V DC RS 232 The Microtherm is powered by Power __ 7 four AA size batteries located in a Gea AD compartment in the underside of the instrument The instrument can also be 00058 Tripod Bush powered continuously using Figure 6 Bottom panel connectors external power applied via the 12 V DC socket Figure 6 Slide Off without the need for internal Lift End batteries to be installed To gain to access to the batteries liftthe Release bottom end of the cover slightly Ver to release it then slide 00021 downwards in the direction of the Figure 7 Removing battery cover arrow mark Figure 7 Warning One cell installed with the wrong polarity may still allow operation but can cause o2. Additional Displayed Information Battery voltage Charger circuit status Memory status Number of runs saved Firmware version User name and details Data Logger Internal memory 512 k RAM with back up battery that provides space for over 49 000 intervals so that when all five temperature and humidity parameters are enabled a total of 245 000 individual results can be saved Logger Interval Adjustable from 30 seconds to 60 min utes Recorded Values Measured levels for the logging interval Maximum minimum and average values for the entire logging period are saved at the end of each logging run Serial Interface RS232 up to 38 400 baud Infrared Interface Future expansion Alarm output 5 V DC when the alarm is activated O V while the alarm is inactive 5 2 WinHSM PC Based Application Software Provides a friendly graphical interface for instrument configuration data download and graphical report presentation Operating System M S Windows M 95 98 ME 2000 and NT compatible Pentium Il or better processor 200 MHz recommended for real time mode Requires 1 44 MB 3 floppy disk drive RS232 serial port 16 MB RAM FDD and HDD Super VGA colour graphics 5 3 Spare Parts Page 43 of 44 Specification MICROTHERM Heat Stress WBGT amp WinHSM Application Software User Manual 107039A Spare Wicks pack of 10 5 4 Optional Accessories 176086B Car Charging Lead 180043B 10 m E
3. MICROTHERM Heat Stress WBGT amp February 2003 WinHSM Application Software User Manual MICROTHERM Heat Stress WBGT And WinHSM Application Software User Manual HB3279 04 COPYRIGHT The copyright in this document which contains proprietary information is vested in CASELLA CEL The contents of this document must not be used for purposes other than that for which it has been supplied or reproduced or disclosed wholly or in part without the prior written permission of CASELLA CEL MICROTHERM Heat Stress WBGT amp WinHSM Application Software User Manual Page 2 of 44 MICROTHERM Heat Stress WBGT amp Warnings WinHSM Application Software User Manual WARNINGS Any attempt to charge non rechargeable cells is hazardous and can result in damage This instrument incorporates an internal fast charger circuit suitable for recharging NiMH cells The charger is enabled disabled via a switch in the battery compartment See Figure 9 in Section 2 1 1 This instrument is delivered with re chargeable nickel cadmium cells and with the CHARGER circuit ENABLED DISABLE the charger circuit before fitting and using non rechargeable cells DISPOSAL OF NiMH BATTERIES Rechargeable batteries contain NiMH and ay must be disposed of in a safe manner In o some countries this may involve specialist aw licensed waste disposal companies Used batteries MUST NEVER be disposed of by placing in a fi
4. WBGT Max c Min c in TWA MTH09 Page 24 of 44 MICROTHERM Heat Stress WBGT amp Operation WinHSM Application Software User Manual A summary screen for the most recent stored run will be displayed 6 Use V or A to select summaries from other runs The run number and total of runs will be indicated the current run will also be available 7 Use lt or gt to display a data screen for the run Run Number 1 24 gt Max c Min c Ave c 25 6 25 5 25 6 25 7 25 7 2527 2545 25 6 WBGT out 25 6 MTH11 Maximum minimum and average values for the whole run are shown 8 When sufficient data has been collected stop logging by returning to the Logger screen and using the Stop Logger option Logging stops and data up to the last completed interval is saved At the end of each logging run i e when logging is stopped or the instrument switched off a summary record will also be saved Each summary record contains the maximum minimum and average values for the whole run together with the start date and time plus the run duration Page 25 of 44 Operation MICROTHERM Heat Stress WBGT amp WinHSM Application Software User Manual Stored data can be downloaded for further manipulation and reporting only by using WinHSM Application Software Page 26 of 44 MICROTHERM Heat Stress WBGT amp Application WinHSM Application Software User Manual Softwa
5. set and the amount of free Mode Stop When full memory space Clear Memory No The time is shown as ddd hh mm ss MTH10 Select logger Intervals Page 22 of 44 MICROTHERM Heat Stress WBGT amp Operation WinHSM Application Software User Manual The logger interval is the time between each recorded data point The following options are available 30 seconds 2 3 4 5 6 10 15 20 30 60 minutes 4 If necessary change the current setting 5 Select logger Mode The logger mode determines what happens when all empty memory locations have been filled with data 6 If necessary change the setting to one of the following alternatives Over Write Run The logger simply carries on recording data so that the oldest records will be overwritten by new ones Stop When Full The logger stops logging when the memory is full 2 5 2 Clearing the Logger Memory The Microtherm has a logging capacity of over 40 000 intervals giving more than 245 000 individual temperature or relative humidity results and 32 runs with the total number of stored runs shown on the Status screen When there is insufficient space remaining in the instrument store for the projected logging run stored data can be deleted All recorded data should be downloaded before clearing the logger s memory as there are no facilities to recover data deleted from the instrument 1 Select and display the Config Logger screen see Sec
6. Winter clothing Water barrier permeable 11 Make a selection to suit the clothing worn for the activity The work rest regimes and the reference WBGT temperatures for the activity and clothing are shown on the dialog 12 Press Add to summary to add the selected values to the summary 13 When OSHA data is already included in the summary press Remove from summary to remove the calculation 3 5 2 Displaying Data as a Table Displaying the information as a table allows you to see the actual values stored together with the date amp time of their occurrence Ml Open the file you want to display as a table as described in Section 3 5 1 Win HSM HSM 001 03 05 08 46 26 hem File Edit Yew Standards Communications Window Help GHP Gxet HDe t O 2 2 HSM 2001 03 05 08 46 26 hem Summary 001 03 05 08 46 mira iiA met A A A A ie For Help press F1 ere 5 5 E Figure 14 Data presented as a table Page 34 of 44 MICROTHERM Heat Stress WBGT amp Application WinHSM Application Software User Manual Software 2 Select Table from the View menu or click E A table that includes all of the records in the file will be displayed as shown in Figure 14 3 Use the vertical scroll bar to move up and down within the table 3 5 3 Displaying Data as a Graph Ts Open the file you want to display as a graph as described in Section 3 5 1 2 Select Graph from the View menu or click 8 The g
7. MTHO5 When the indicated voltage is greater than 4 8 V the batteries are in a fully charged condition If the voltage from rechargeable batteries is lower than 4 2 V more than 80 of the capacity has been used Consider Recharging The battery icon will blink to warn that the internal battery is approaching discharge Then when the batteries become discharged logging is terminated and the instrument will commence an automatic shut down sequence The battery voltage will be shown as 10 V while external power is being applied 2 2 3 Configuring for the Current Measurement The Configuration menu enables all functions for the instrument s current operating mode to be defined fi With the Main menu on display see Section 2 2 2 use V or A to highlight the Configuration option 2 Press to display the Configuration menu Page 17 of 44 Operation MICROTHERM Heat Stress WBGT amp WinHSM Application Software User Manual CONFIGURATION av Back Light Time amp Date Language SerialComm s Units C F Buzzer Alarm MTH12 3 Specify the user language by pressing while highlighting the Language option The following languages are available English Fran aise Deutsch Italiano Espa ol 4 Use V or A to highlight the required language 5 Press to select the language and return to the Configuration screen 6 Specify the display back light function by pressing while
8. and the memory cleared when necessary display the Logger screen Page 23 of 44 Operation MICROTHERM Heat Stress WBGT amp WinHSM Application Software User Manual Logger Start Logger View Runs Config Logger Memory 2 Full Runs 1 32 MTHO6 2 Highlight the Start Logger option and press to start logging 05 32 4dHAV BGTin 24 2 24 0 Dew 23 7 23 8 RH 98 3 22 1 WATERLOW WBGTin TWA MTHO8 The measurement screen displays levels from the current interval 3 Press lt and gt to switch between displays with WBGT indoor and WBGT outdoor values 4 Press A and V to switch between the measurement screen and a graph of one of the parameters 2 3 05 32 MTHO7 24 0 15min Both screens identify the run and show the current interval number Data stored during the current or other runs can be reviewed on the instrument display while it is being collected 5 From the Logger screen select and display the View Runs screen Run Number 1 2 lt gt Date Fri i Dec Start 16 10 57 Duration 1 29 44 WBGT Max c Min c in TWA MTH09 Page 24 of 44 MICROTHERM Heat Stress WBGT amp Operation WinHSM Application Software User Manual A summary screen for the most recent stored run will be displayed 6 Use V or A to select summaries from other runs The run number and total of runs will be indicated the
9. Wait for the Casella CEL welcome screen to be displayed then follow the on screen instructions Once installation is complete a WinHSM icon will be found on your Windows desktop Page 27 of 44 Application MICROTHERM Heat Stress WBGT amp Software WinHSM Application Software User Manual 3 2 Starting WinHSM Application Software Start the WinHSM application software by double clicking on its desktop icon or selecting it from the Start Menu The top level window will be displayed As the cursor is moved to each menu button the relevant function will be displayed on the message line at the bottom left of the display If this is the first time that you open the newly installed software a dialog will be displayed telling you that no profile has been defined and asking you to create and select one before proceeding Your only option is to click OK which displays the Active Profile dialog see Section 3 3 1 3 3 Profiles Profiles are used to identify the unique operating parameters of each instrument or measurement application In situations where multiple instruments are interrogated by one PC the use of profiles provides a convenient way of identifying and managing data from each instrument Profiles are stored in the PC 3 3 1 Creating Editing a Profile s Create a new profile by selecting the Profiles option on the Edit menu or by clicking You will be presented with the Active Profile dialog w
10. 4 05 kg Dimensions Instrument 245 x 95 x 50 mm Sensor Array 90 high x 225 x 69 mm Carrying case 135 x 490 x 370 mm Displayed and Stored Values Wet Bulb Globe Temperature Indoor Wet Bulb Globe Temperature Outdoor Wet Bulb Globe Temperature Indoor Time Weighted Average Wet Bulb Globe Temperature Outdoor Time Weighted Average Ta Dry Bulb Air Tg Globe Tnw Natural Wet Dewpoint calculated Relative Humidity Percent calculated All temperatures levels may be selected for display in C or F The time weighted average TWA values represent the rolling 1 hour average since the instrument was switched on or a logging run was started The TWA value is updated every 30 seconds During the first hour the value is shown as Additional Stored Values Wet Bulb Globe Temperature Indoor Max Min and Average values Wet Bulb Globe Temperature Outdoor Max Min and Average values Wet Bulb Globe Temperature Indoor Time Weighted Average Max and Min values Wet Bulb Globe Temperature Outdoor Time Weighted Average Max and Min values Ta Dry Bulb Air Max Min and Average values Tg Globe Max Min and Average values Tnw Natural Wet Max Min and Average values Time weighted average values represent the average since the instrument was switched on or reset Page 42 of 44 MICROTHERM Heat Stress WBGT amp Specification WinHSM Application Software User Manual
11. 4 in out av WBGTin 24 2 oc Ta 24 0 c Dew 23 7 C 23 8 RH 98 3 22 1 c WATERLOW WBGTinTWA MTHO2 When switched ON the readings may drift a small amount so allow at least one minute for the instrument to settle Press O to switch your Microtherm OFF 2 2 2 Checking Battery Status 8 Firmware Version The internal battery voltage is displayed on a Status screen together with the instrument firmware internal program version T 2 Switch the instrument ON and wait for the measurement screen to be displayed as described in Section 2 2 Press E to display the Main menu Page 16 of 44 MICROTHERM Heat Stress WBGT amp Operation WinHSM Application Software User Manual MAINMENU av View Graph View Measurement Status Logger Configuration MTH04 Use V or A to highlight the Status option Press to display the Status screen 1 Dec 10 25 55 Battery 4 9 volts Charger Off Ignore the displayed voltage Memory 2 Full hen external power is being Runs Version used UserName and Details MTHO5 When the indicated voltage is greater than 4 8 V the batteries are in a fully charged condition If the voltage from rechargeable batteries is lower than 4 2 V more than 80 of the capacity has been used Consider Recharging The battery icon will blink to warn that the internal battery is approaching discharge Then when the ba
12. current run will also be available 7 Use lt or gt to display a data screen for the run Run Number 1 24 gt Max c Min c Ave c 25 6 25 5 25 6 25 7 25 7 2527 2545 25 6 WBGT out 25 6 MTH11 Maximum minimum and average values for the whole run are shown 8 When sufficient data has been collected stop logging by returning to the Logger screen and using the Stop Logger option Logging stops and data up to the last completed interval is saved At the end of each logging run i e when logging is stopped or the instrument switched off a summary record will also be saved Each summary record contains the maximum minimum and average values for the whole run together with the start date and time plus the run duration Page 25 of 44 Operation MICROTHERM Heat Stress WBGT amp WinHSM Application Software User Manual Stored data can be downloaded for further manipulation and reporting only by using WinHSM Application Software Page 26 of 44 MICROTHERM Heat Stress WBGT amp Specification WinHSM Application Software User Manual 5 SPECIFICATION 5 1 Instrument Specification Measurement Sensing technique Ta Dry Bulb Air Tg Globe Tnw Natural Wet Relative Humidity Resolution Platinum Resistance Temperature Detectors 100 Q elements to EN 60751 Class A using 4 wire cable up to 30 m Measuring Range 10 60 C Accuracy 0 5 C Measuri
13. following options are available 30 seconds 2 3 4 5 6 10 15 20 30 60 minutes 4 If necessary change the current setting 5 Select logger Mode The logger mode determines what happens when all empty memory locations have been filled with data 6 If necessary change the setting to one of the following alternatives Over Write Run The logger simply carries on recording data so that the oldest records will be overwritten by new ones Stop When Full The logger stops logging when the memory is full 2 5 2 Clearing the Logger Memory The Microtherm has a logging capacity of over 40 000 intervals giving more than 245 000 individual temperature or relative humidity results and 32 runs with the total number of stored runs shown on the Status screen When there is insufficient space remaining in the instrument store for the projected logging run stored data can be deleted All recorded data should be downloaded before clearing the logger s memory as there are no facilities to recover data deleted from the instrument 1 Select and display the Config Logger screen see Section 2 5 1 2 Highlight the Clear Memory option select YES then press Ge A warning message will be displayed asking for confirmation before the contents of the memory are erased 3 Press to confirm the erase operation ALL stored runs will be DELETED 2 5 3 Start Logging 1 With the logger settings configured as described in Section 2 5 1
14. instrument s internal clock will be reset using the date and time from the PC Ensure the PC s clock is correctly set 3 4 Downloading Data from the Logger Before you can generate graphs and tables from the data recorded by the Microtherm you must download it to your PC l Make sure the instrument is switched on and the communications cable plugged into both the Microtherm and the appropriate serial port on your computer 2 To start downloading select Download from the Comms menu or cor Ae The download sequence can be followed on the PC screen Data from individual sample runs will be saved in separate files Note Although data from uncompleted time intervals is saved in the instrument it will not be included with the downloaded measurement file In the extreme case of a run saved with no completed time intervals the file will not be downloaded 3 5 Presentation of Data Three data presentation options are available summary table and graph When data is displayed using any of these options use Print from the File menu or click to print a hard copy of the current information or graph on a printer attached on line to your PC A o BZ f Use Copy from the Edit menu or click to copy the current information or graph to your PC clipboard from where it may be pasted into other applications Page 30 of 44 MICROTHERM Heat Stress WBGT amp Application WinHSM Application Software User Manual Software
15. to measure three associated ambient temperatures see Figure 2 E The wet temperature sensor is mounted vertically and has a tubular cotton wick sheathing its length 2 The dry temperature sensor has a radiation shield 3 The globe temperature sensor is mounted at the other end of the crossbar from the dry sensor Connect the sensor array by inserting the cable connector into the socket in the top end of the instrument case with the red dot facing the front of the instrument to ensure correct pin location then turn the large knurled ring to tighten the security collet Remember to free the collet before attempting to remove the sensor array In use the sensor array must be maintained with the crossbar horizontal to prevent spillage from the water container during the duration of a typical measurement which should take at least 20 minutes on each station This is best achieved by standing the instrument on its foot on a horizontal surface as shown in Figure 10 mounting the instrument on a tripod available from Casella CEL or by using an extension cable to allow the sensor array to be installed on a tripod Extension cables are available with a standard length of 10 m The maximum distance between sensors and instrument is 50 m Page 14 of 44 MICROTHERM Heat Stress WBGT amp Operation WinHSM Application Software User Manual 1 4 Whitworth 3 Foot Permanently 000
16. 3 5 1 Displaying the Data Summary Before reviewing a data file stored on the PC you must open it as follows a T Select Open from the File menu or click A dialog will be displayed that allows you to select the data file to be opened 2 Select and open the required data file The data summary will be displayed as shown in Figure 11 This is the starting point for accessing all analysis displays available within the WinHSM software It shows maximum minimum and average temperatures plus the dates and times when the run started and ended Once the file is active table and graph displays can also be opened 2 At any time the Summary screen can be recalled to the display by selecting Summary from the View menu or by clicking El One each of ISO metabolic rate reference step 3 and OSHA recom mendation step 9 can be calculated and added to the summary Win HSM HSM 2001 03 05 08 46 26 hsm Fie Edt View Standards Communications Window Help GEFs SG ektHO t O A 2 HSM 2001 03 05 6 by y WBGT Heat Stress Summary Report Report data file C Program Files Casella CEL Ltd HSM HSM 2001 03 05 08 46 26 hsm 08 46 26 3 5 01 08 58 56 3 5 01 Minimum Average 16 5 C 16 8 C 119 125 15 7 16 2 C 0 0 13 8 C 0 0 137 C 9 1 62 8 For Help press F1 Pr EZ Figure 11 The results summary Page 31 of 44 Application MICROTHERM Heat Stress WBGT amp Software WinHSM Application
17. 63 1 4 UNC Tripod Bush Attached Figure 10 The Microtherm standing on a horizontal surface The reservoir cap is a tight push fit with an O ring seal 1 4 2 2 Use only distilled water and fill the reservoir up to the line engraved inside Over filling may cause the water to siphon out of the container Replace the cap after filling Change the cotton wick if it becomes discoloured Use the supplied screwdriver to tease out the fibres enough to allow the wick to be pulled down to the first shoulder on the wet bulb Also use the screwdriver to ease the wick through the hole in the reservoir cap Check that the free end of the wick reaches the bottom of the water reservoir Empty the reservoir after use Preliminary Operations 2 2 1 Switching ON and OFF Warning DO NOT use non rechargeable batteries while the charging circuit is enabled Press O to switch your Microtherm ON Page 15 of 44 Operation MICROTHERM Heat Stress WBGT amp WinHSM Application Software User Manual 2 A welcome screen will be displayed showing the instrument s name Whenever the internal charger circuit has been enabled as described in Section 2 1 1 and Figure 9 and external power is applied i e the charger is actually charging the internal batteries the following warning screen is displayed suggesting that the batteries be checked to make sure they are rechargeable WARNING Battery Charger ON
18. Check NiCadType Batteries Fitted MTHO1 Esc The next screen shows information about the instrument such as battery condition charger switch setting memory capacity and the installed firmware internal software version The charger switch will be shown OFF when no external power is present Finally a measurement screen is displayed 4 in out av WBGTin 24 2 oc Ta 24 0 c Dew 23 7 C 23 8 RH 98 3 22 1 c WATERLOW WBGTinTWA MTHO2 When switched ON the readings may drift a small amount so allow at least one minute for the instrument to settle Press O to switch your Microtherm OFF 2 2 2 Checking Battery Status 8 Firmware Version The internal battery voltage is displayed on a Status screen together with the instrument firmware internal program version T 2 Switch the instrument ON and wait for the measurement screen to be displayed as described in Section 2 2 Press E to display the Main menu Page 16 of 44 MICROTHERM Heat Stress WBGT amp Operation WinHSM Application Software User Manual MAINMENU av View Graph View Measurement Status Logger Configuration MTH04 Use V or A to highlight the Status option Press to display the Status screen 1 Dec 10 25 55 Battery 4 9 volts Charger Off Ignore the displayed voltage Memory 2 Full hen external power is being Runs Version used UserName and Details
19. IFICATION 2 ee eae 41 5a Instrument Specification ooa aa 41 5 2 WinHSM PC Based Application Software 43 5 3 Spare Pant ea Gos e eke Se ate e gy we A ie a E 43 5 4 Optional Accessories 00 20004 44 5 5 CE Comipliane s 4 x28 24 daa sta dae wl oa 44 Page 6 of 44 MICROTHERM Heat Stress WBGT amp Description WinHSM Application Software User Manual 1 DESCRIPTION OF THE MICROTHERM 1 1 Background A person s thermal comfort is mainly related to the thermal balance of their body as a whole This balance is influenced by their physical activity and clothing as well as the environmental parameters of air temperature mean radiant temperature air velocity and air humidity Problems of heat stress are common in workplaces such as foundries steel mills brick glass and ceramic factories power generation plants coke ovens laundries modern glass buildings with inadequate air conditioning mines and many other types of outdoor work in hot climates Whenever heat stress is imposed on the human body there is a resulting strain which may result in physiological reactions such as sweat production increased heart rate and higher core temperature The greater the heat stress the greater heat strain and under certain conditions the latter may attain such magnitude as to cause damage to health Several indices have been designed to integrate the environmental factors contributing
20. Operations 15 2 2 1 Switching ON and OFF 15 2 2 2 Checking Battery Status amp Firmware Version 16 2 2 3 Configuring for the Current Measurement 17 2 3 Calibration 224 04 628 0446 4 bo we GPa ok wg 20 2 4 Measurement 2 02 02 0 5204 20 2 5 DataLogging 20 004 22 2 5 1 Configuring the Logger 22 2 5 2 Clearing the Logger Memory 23 2 5 3 StartLogging 0 0 aa 23 3 WinHSM APPLICATION SOFTWARE 27 3 1 Installation on Windows 95 98 amp Windows NT 27 3 2 Starting WinHSM Application Software 28 3 3 Profiles suc et ee RA we oh Ea awe 28 3 3 1 Creating Editing a Profile 28 3 3 2 Sending a Profile to the Instrument 29 3 4 Downloading Data from the Logger 30 3 5 Presentation of Data 30 3 5 1 Displaying the Data Summary 30 3 5 2 DisplayingDataasaTable 34 3 5 3 DisplayingDataasaGraph 35 3 5 4 Exporting Data to Other Applications 35 3 6 Real Time Display Mode 36 Page 5 of 44 Contents MICROTHERM Heat Stress WBGT amp WinHSM Application Software User Manual TABLE OF CONTENTS Continued 4 SERVICING 2 2 85884 ee 39 4 1 Service Department 0 39 4 2 Fault Finding TIPS as 2 6 a0 Say ae do amp wo med 39 5 SPEC
21. Software User Manual Metabolic class ooo Class 3 High metabolic rate Metabolic rate M range 200 lt M lt 260 Wn Value lo be used for calculation of mean metabolic rate 230 Win Examples Intense arm and trunk work carrying heavy material shoveling sledge hammer work sawing planing or chiseling hard wood hand mowing digging walking at a speed of 5 5 km h to 7 km h Pushing or pulling heavily loaded handcarts or wheelbarrows chipping castings concrete block laying Heat stress index Y Person acclimatised to heat Add to summary Y Sensible ait movement Reference value of WBGT 25 0 T assumming clothing wom is permiable to air and steam with a thermal insulation index Icl 0 6 Clo Figure 12 The ISO metabolic rate calculation dialog 3 Click to select an ISO reference The Metabolic Rate dialog shown in Figure 12 will be displayed The Class field offers the following options 0 Resting 1 Low metabolic rate 2 Moderate metabolic rate 3 High metabolic rate 4 Very high metabolic rate 4 Make a selection based on the examples suggested for the class of work performed 5 If the person is acclimatised to the heat tick the relevant box y 6 Similarly for higher metabolic classes where there is sensible air movement tick the relevant box y The mean metabolic rate and reference WBGT temperature for the class and conditions of work are shown
22. a profile graph of one of the current measurement parameters Page 21 of 44 Operation MICROTHERM Heat Stress WBGT amp WinHSM Application Software User Manual 5 6 2 5 Battery icon that empties as power is drained Current parameter value MTHO3 This graph scrolls across the screen from right to left as samples are collected with the current parameter and value identified Press lt to change the displayed parameter on the graph The options are Ta WBGT out WBGT in Dewpoint Relative Humidity Tg Tnw Press gt to change the time base between 15 30 60 120 minutes Press A or V again to return to the measurement display Data Logging 2 5 1 Configuring the Logger Before storing data the logger should be configured for the proposed measurements ile 3 Display the Logger screen by selecting the Logger option from the Main Menu From the Logger screen select and display the Config Logger screen Config Logger 4bawv Logging time available Intervals Min a depends upon the intervals Log Time 034 03 12 00 set and the amount of free Mode Stop When full memory space Clear Memory No The time is shown as ddd hh mm ss MTH10 Select logger Intervals Page 22 of 44 MICROTHERM Heat Stress WBGT amp Operation WinHSM Application Software User Manual The logger interval is the time between each recorded data point The
23. alibration is not normally required 2 4 Measurement For most consistent measurement stay at least 20 minutes on each station Page 20 of 44 MICROTHERM Heat Stress WBGT amp Operation WinHSM Application Software User Manual 1 If not already on press O to swith ON A welcome screen will be displayed showing the instrument s name This will be followed for a brief period by the status screen 1 Dec 10 25 55 Battery 4 9volts Charger Off Ignore the displayed voltage Memory 2 Full Rune 1 32 hen external power is being Version NN NN N used UserName and Details MTHO5 And finally by the measurement screen 4 in out gt av WBGTin 24 2 oc 24 0 c Dew 23 7 23 8 RH 98 3 Tnw 22 1 WATERLOW WBGTinTWA c MTHO2 This displays the following measured or calculated parameters WBGTin Wet bulb globe temperature indoors Ta Air temperature Tg Globe temperature Tnw Natural wet temperature WBGTin TWA Wet bulb globe temperature indoors time weighted average given as a rolling 60 minute average every 30 seconds Dew Dewpoint temperature RH Relative humidity Press lt or gt to display WBGTout Wet bulb globe temperature outdoor WBGTout TWA Wet bulb globe temperature outdoor time weighted average given as a rolling 60 minute average every 30 seconds This screen may also display a water condition warning Press A or V to display
24. art of the file name for downloaded data You may want to add a hyphen as shown below to separate the date from the prefix The file name will be of the form fileprefix yyyy mm dd hh mm ss hsm for example Site1 2001 02 20 20 14 06 hsm Where the date and time part of the file name refer to when the run was started Make a suitable entry When the default directory is not suitable use the Browse option to select a file path and directory for storing data files The Units dialog specifies whether the temperatures displayed by the PC will be defined in C or F Make a suitable choice Press OK to save the information in the profile Press Accept to accept this as the active profile 3 3 2 Sending a Profile to the Instrument The configuration information contained in an instrument profile must be transferred to the Microtherm Before attempting to send a profile make sure the instrument is switched on and the serial communications cable plugged into both the instrument and the appropriate port on your PC Page 29 of 44 Application MICROTHERM Heat Stress WBGT amp Software WinHSM Application Software User Manual 1 Select Send Profile from the Comms menu or click A message will be displayed warning that this procedure will erase all data in the instrument and asking if you want to continue Ze Start the transfer Any errors will be reported and the transfer aborted During the transfer the
25. ary cells or mains power supply while the high definition liquid crystal display is capable of showing both text and graphical information It also shows instrument configuration details temperature levels logger information and battery condition The instrument uses a membrane keypad for all control functions while a serial RS 232 socket is provided for data transfer to a PC for data manipulation and presentation using Casella WinHSM application software 1 3 The Sensor Array Fill Level Wet Temperature gt ir Temperature Globe Tripod Bush Temperature Connector Figure 2 The Sensor Array 00062 Page 9 Description MICROTHERM Heat Stress WBGT amp WinHSM Application Software User Manual The sensor array is illustrated in Figure 2 It consists of three platinum resistance temperature detectors PRTD to measure three ambient temperatures as follows Wet Temperature Sensor Mounted vertically with a tubular cotton wick over its length and the end of the cotton extending into a water reservoir Always use distilled water Dry Temperature Sensor Oriented at 90 from the wet temperature sensor and fitted with a radiation shield Globe Temperature Sensor A sensor within a black globe monitors temperature increase due to incident heat radiation The complete sensor array can be removed from the control unit and mounted on a tripod for remote oper
26. ata Bits 8 StopBits 1 Parity None MTH16 The Serial Comms screen is displayed where the only setable parameter is Baud Rate Use lt or gt to edit the entry in the Baud Rate field Page 19 of 44 Operation MICROTHERM Heat Stress WBGT amp WinHSM Application Software User Manual 16 17 18 19 20 21 22 2 3 When the entry matches the requirements of your PC also see Section 3 3 1 press to accept the setting Specify whether the measurement units should be C or F by pressing while highlighting the Units C F option on the Configuration menu Use lt or ES to select the required units Press to accept the setting Specify alarm requirements by pressing while highlighting the Buzzer Alarm option on the Configuration menu The Buzzer Alarm screen is displayed Buzzer Alarm 4bav Buzzer Alarm WBGT Threshold 30 0 C 86 0 F MTH18 Choose from the following options Buzzer Disable Enable Alarm WBGT WBGTtwa Disable Ta Threshold 0 0 to 40 0 C in 0 1 steps As the majority of heat stress legislation is written in terms of C threshold alarm settings can be specified only in increments of C However the equivalent F value is also shown Press to accept the settings and return to the Configuration menu Calibration The sensors are manufactured to high standards of accuracy stability and sensitivity so that separate c
27. ation via extension leads up to 50 m long 1 4 The Microtherm Menu Structure The operator interface is based upon a series of menu options organised as shown on the fold out sheet at the back of this book A combination of function keys and navigator keys on the front panel of the instrument are used to move around the menu system and change setup parameters Their functions are as follows A ana V Navigator keys used to move around the current menu options sna Navigator keys used to change the contents of the selected field such as the indicated date time logging interval etc Enter key that accepts the current menu option or highlighted option E Esc Escape key that steps back to a previous menu Press this key several times at any point to obtain a short cut back to the Main menu The Main menu contains all parameters and options relevant to operation and gives access to the two sub menus Configuration menu Allows the instrument parameters to be specified Page 10 of 44 MICROTHERM Heat Stress WBGT amp Description WinHSM Application Software User Manual Logger Allows the logger to be configured and data storage to be started and stopped 1 5 Alarm Output RS 232 Socket An alarm output is available which switches from a logic 0 to 5 V DC whenever the on screen alarm is active Figure 3 shows line usage in the connector while Table 2 identifies the line functions 1 6 Schedule o
28. ds Dew Dewpoint temperature RH Relative humidity Press lt or gt to display WBGTout Wet bulb globe temperature outdoor WBGTout TWA Wet bulb globe temperature outdoor time weighted average given as a rolling 60 minute average every 30 seconds This screen may also display a water condition warning Press A or V to display a profile graph of one of the current measurement parameters Page 21 of 44 Operation MICROTHERM Heat Stress WBGT amp WinHSM Application Software User Manual 5 6 2 5 Battery icon that empties as power is drained Current parameter value MTHO3 This graph scrolls across the screen from right to left as samples are collected with the current parameter and value identified Press lt to change the displayed parameter on the graph The options are Ta WBGT out WBGT in Dewpoint Relative Humidity Tg Tnw Press gt to change the time base between 15 30 60 120 minutes Press A or V again to return to the measurement display Data Logging 2 5 1 Configuring the Logger Before storing data the logger should be configured for the proposed measurements ile 3 Display the Logger screen by selecting the Logger option from the Main Menu From the Logger screen select and display the Config Logger screen Config Logger 4bawv Logging time available Intervals Min a depends upon the intervals Log Time 034 03 12 00
29. eld with dry sensor inside Water reservoir Wet temperature sensor Knurled Cotton wick locking ring Control unit ON OFF Escape Navigator keys MICROTHERM Battery charging Heat Stress WBGT indicator 00061 Enter Figure 1 General layout of the Microtherm Heat Stress WBGT Page 8 of 44 MICROTHERM Heat Stress WBGT amp Description WinHSM Application Software User Manual It is a compact site monitoring instrument intended primarily for tripod mounting but may also be handheld it has the following main features XA LCD graphics display A Real time display A Full datalogging facilities as standard A Low water level warning 4 Built in alarm for WBGT levels A RH and dewpoint calculation amp Automatic calculation of work rest regimes via PC Software A Optional tripod mounting and extension cable O Meets the requirements of ISO 7234 DIN A Ergonomic design The sensor array can be mounted directly on the instrument case or detached and mounted on a tripod with an extension cable to provide remote sensing Accuracy is achieved by using Platinum Resistance Temperature Detectors manufactured to high standards of accuracy stability and sensitivity These sensors conform to the requirements of IEC 751 class A and EN 60751 class A On the sensor array a radiation shield is provided for the dry temperature sensor The instrument will operate from rechargeable batteries prim
30. f Parts Figure 3 Line identities of the Alarm RS 232 socket viewed externally i e also from the solder bucket side of the plug 00018 Table 2 RS 232 Connector line functions Function Pin Number Wire Colour 9 way D Type PC RS 232 Ground 1 Yellow N A Alarm 2 Red N A RS 232 Receive in 3 White 3 TX out RS 232 Transmit out 4 Black 2 RX in Comms ground 5 Blue 5 Grouna 4 DTR 8 CTS 6 DSR Linked together Microtherm Control Unit Sensor Array Carry Case RS 232 Lead and PC Software Water Bottle Wicks pack of 10 User Manual 4 x NiCad Rechargeable Batteries 12 V power supply Mains Plug UK Fitting Mains Plug European Fitting Mains Plug USA Fitting Mains Plug Australian Fitting Page 11 of 44 Description MICROTHERM Heat Stress WBGT amp WinHSM Application Software User Manual Figure 4 shows how the relevant plug adaptor for different local areas is fitted to the power supply unit Figure 5 shows the components of the kit installed in the carry case mn Slide to Unlock ZS e TTT 02055 Figure 4 Fitting plug adaptor 0000 Insert Water Bottle this way round to prevent leakage if the cap is not screwed on tightly
31. geable batteries may be supplied by Casella CEL in a discharged state In order to obtain maximum capacity from new NiCd batteries several charge and discharge cycles may be required Page 13 of 44 Operation MICROTHERM Heat Stress WBGT amp WinHSM Application Software User Manual Warning DO NOT enable the charger circuit while non rechargeable batteries are installed REA Factory The instrument has a built in use only fast charging circuit that uses Serial Number Label DO NOT power applied via the 12 V DC ADJUST socket shown in Figure 6 This allows rechargeable batteries to be Charger recharged in situ Enable When rechargeable batteries are to be charged in situ set the Charger Enable DIP switch to ON as shown in Figure 9 00060 Figure 9 Location of DIP switches Charging will terminate automatically once the batteries are fully charged which takes approxi mately 3 hours for fully discharged batteries 2 1 2 Temperature Sensor Array The detachable sensor array houses three platinum resistance temperature detectors to measure three associated ambient temperatures see Figure 2 E The wet temperature sensor is mounted vertically and has a tubular cotton wick sheathing its length 2 The dry temperature sensor has a radiation shield 3 The globe temperature sensor is mounted at the other end of the crossbar from the dry sensor Connect the sensor arra
32. here the active profile is highlighted 2 Select the name of a profile to edit or press New as appropriate 3 For a new profile enter a suitable name in the Profile Name dialog Four tab Properties dialogs define the basic features of the profile The ID dialog specifies the instrument identity and selects a pre drawn 128 wide by 64 high black and white bitmap bmp for use as a welcome screen 4 Make suitable entries in the fields In addition to normal alpha numeric characters the following may also be used in the messages and SPACE The Communications dialog configures the RS 232 serial interface and specifies Modem details Page 28 of 44 MICROTHERM Heat Stress WBGT amp Application WinHSM Application Software User Manual Software 9 10 The Port Baud Rate and a modem Telephone Number may need to be defined Make entries in the Comms fields to suit the PC and communications port in use If a mouse or some other device is already installed on Com1 then change the entry to another free port Also make sure that both PC and Microtherm instrument are set to the same baud rate The Data Files dialog specifies a file prefix and store location for the data files to be downloaded As the instrument may contain data from many different sampling runs the downloaded data will be split into individual files each one representing a single run The File Prefix defines the first p
33. high lighting the Back Light option VA Choose from the following options Light ON The display is lit as you leave this screen It remains lit until switched off Light OFF Switches the backlight off Keypress ON The display is lit each time a key is pressed while viewing a menu It remains lit for the duration set Duration Sets the duration timer The duration may be set in 1 second steps anywhere between 5 and 30 seconds 8 Press to accept the setting and return to the Configuration menu 9 Specify the time and date by pressing while highlighting the Time amp Date option Page 18 of 44 MICROTHERM Heat Stress WBGT amp Operation WinHSM Application Software User Manual 10 15 The only option on the Time amp Date screen is Set Clock The instrument has an internal real time clock which should be set to the current time and date When data is being logged the measured temperatures and calculated parameters will be recorded against the current date and time However when the instrument is configured by the WinHSM software the time and date on the internal clock are set automatically to the PC s time and date Please refer to Chapter 3 for details Press to display the Set Clock screen SetClock dba v Fri 91 OJO 14 59 26 MTH19 Use V or A to select a time or date field to be edited and lt or gt to edit the entry in the selected field Use A or vy to selec
34. ling Change the cotton wick if it becomes discoloured Use the supplied screwdriver to tease out the fibres enough to allow the wick to be pulled down to the first shoulder on the wet bulb Also use the screwdriver to ease the wick through the hole in the reservoir cap Check that the free end of the wick reaches the bottom of the water reservoir Empty the reservoir after use Preliminary Operations 2 2 1 Switching ON and OFF Warning DO NOT use non rechargeable batteries while the charging circuit is enabled Press O to switch your Microtherm ON Page 15 of 44 Operation MICROTHERM Heat Stress WBGT amp WinHSM Application Software User Manual 2 A welcome screen will be displayed showing the instrument s name Whenever the internal charger circuit has been enabled as described in Section 2 1 1 and Figure 9 and external power is applied i e the charger is actually charging the internal batteries the following warning screen is displayed suggesting that the batteries be checked to make sure they are rechargeable WARNING Battery Charger ON Check NiCadType Batteries Fitted MTHO1 Esc The next screen shows information about the instrument such as battery condition charger switch setting memory capacity and the installed firmware internal software version The charger switch will be shown OFF when no external power is present Finally a measurement screen is displayed
35. mer The duration may be set in 1 second steps anywhere between 5 and 30 seconds 8 Press to accept the setting and return to the Configuration menu 9 Specify the time and date by pressing while highlighting the Time amp Date option Page 18 of 44 MICROTHERM Heat Stress WBGT amp Operation WinHSM Application Software User Manual 10 15 The only option on the Time amp Date screen is Set Clock The instrument has an internal real time clock which should be set to the current time and date When data is being logged the measured temperatures and calculated parameters will be recorded against the current date and time However when the instrument is configured by the WinHSM software the time and date on the internal clock are set automatically to the PC s time and date Please refer to Chapter 3 for details Press to display the Set Clock screen SetClock dba v Fri 91 OJO 14 59 26 MTH19 Use V or A to select a time or date field to be edited and lt or gt to edit the entry in the selected field Use A or vy to select other fields and lt or gt to edit the entries When all entries on the Set Clock screen are correct press to accept the settings and return to the Time amp Date screen Specify the serial communication details by pressing while highlighting the Serial Comm s option on the Configuration menu Serial Comms lt gt Baud Rate DJJ D
36. ng Range 20 120 C Accuracy 20 50 C 0 5 C Accuracy 50 120 C 1 0 C Measuring Range 5 40 C Accuracy 0 5 C Less than 5 from 35 100 RH 0 1 for temperature 0 1 for RH For inside outside measurements with no solar load Use WBGTin 0 7Tnw 0 3Ta For outside measurements with solar load Power Supply Use WBGTout 0 7Tnw 0 2Tg 0 1Ta Instrument Consumption Approx 30 mA Battery Typical operating time Battery Charging Charge Rate Power adaptor 4 x AA MN1500 cells Alkaline or rechargeable NiMH Alkaline Batteries 2700 mAh gt 85 hours Rechargeable NiMH cells 1700 mAh gt 40 hours Internal NiCd fast charger circuitry Charge termination based on Negative delta V detection with additional time out protection The charger must be disabled for dry cell operation Fast charge rate 450 mA Standby charge rate 55 mA approx Universal with input voltage range 100 240 V AC 47 63 Hz Output 12 V DC at 0 8 A Supplied with connectors for UK USA Australian and European mains outlet sockets The instrument may be powered continuously from the power adaptor Page 41 of 44 Specification MICROTHERM Heat Stress WBGT amp WinHSM Application Software User Manual Physical Display 128 x 64 pixel LCD Graphics panel with backlight Keypad 7 key tactile membrane Weight Instrument with sensor array 0 97 kg Complete kit in carrying case
37. ng the real time display facility ensure that your Microtherm is switched on and connected to the appropriate serial port of your PC Figure 16 The real time display Page 36 of 44 MICROTHERM Heat Stress WBGT amp Application WinHSM Application Software User Manual Software 1 Select Real Time from the Comms menu or click E The real time window is displayed Measured profiles for the run will start immediately scrolling from the right as shown in Figure 16 The vertical axis of the graph is scaled automatically to cover the full range of values measured with temperatures shown on the left axis and relative humidity to 100 on the right axis The header for each parameter identifies the trace by colour and also shows the following information Current Value Minna Se lt Colour Code Line Maximum Value Page 37 of 44 Application MICROTHERM Heat Stress WBGT amp Software WinHSM Application Software User Manual 2 Tick the relevant boxes V to display the required parameters 3 Press the Reset button to clear existing values The field to the right of the Graph allows the time scale of the x axis to be switched between 1 2 4 and 10 hours 4 Press a suitable button to select the required time scale Page 38 of 44 MICROTHERM Heat Stress WBGT amp Operation WinHSM Application Software User Manual 2 OPERATION The Microtherm Heat Stress WBGT is a sensitive
38. on the dialog 7 Press Add to summary to add the selected values to the summary Page 32 of 44 MICROTHERM Heat Stress WBGT amp Application WinHSM Application Software User Manual Software Work 10 Activity Standing heavy hand work 230 260 Ww gt WBGTs and recommended work rest regimes Continuous work 247 e 75 work 25 rest each hour 26 0 C 50 work 50 resteachhou 272 C 25 work 75 rest each hour 21 C Add to summary Remove fror Figure 13 The OSHA recommendations calculation dialog When ISO data is already included in the summary press Remove from summary to remove the calculation Click to select an OSHA recommendation The OSHA Recommendations dialog shown in Figure 13 will be displayed The Activity field offers the following options Sitting 95 W Standing 115 W Standing light hand work 160 210 W Standing heavy hand work 210 230 W Standing heavy hand work 230 260 W Walking at 4 km h 260 W Standing light arm work 315 W Work with whole body light 315 W Standing heavy arm work sawing 420 675 W Work with whole body moderate 420 W Work with whole body heavy 560 W Make a selection based on the examples suggested for the activity The Clothing field offers the following options Light summer clothing Cotton overalls Page 33 of 44 Application MICROTHERM Heat Stress WBGT amp Software WinHSM Application Software User Manual
39. raph will be displayed as shown in Figure 15 Both axes of the graph are scaled automatically to cover the full range of values stored and the entire time period contained in the data file The different traces are identified by colour 3 Tick the relevant boxes V to display the required temperature parameters on the graph The graph is redrawn immediately to include the marked parameters GEFs Gwe t amp Dw 12 HSM 2001 03 05 08 46 26 ham Summary KK 0 HSM 2001 03 05 08 46 26 ham Table pi a F E I 1 1 1 I F ARRESTO Excheripren Ei el ed ae Figure 15 Data presented as a graph Page 35 of 44 Application MICROTHERM Heat Stress WBGT amp Software WinHSM Application Software User Manual 3 5 4 Exporting Data to Other Applications WinHSM data files hsm can be imported into other applications Data files created by WinHSM software are saved as comma delimited ASCII text Each set of readings is saved as a single line terminated by a carriage return line feed pair These files are easily imported into many commercial word processor and spreadsheet applications such as Microsoft Word and Excel 3 6 Real Time Display Mode The WinHSM application software is able to provide a real time graphical display of the Microtherm current readings Scrolling real time traces provide a clear indication of changes in temperature or relative humidity as they occur Before usi
40. re 3 WinHSM APPLICATION SOFTWARE WinHSM Application Software supports the data logger facilities offered by the Microtherm Heat Stress WBGT It is specifically written by Casella CEL to simplify the process of instrument configuration downloading and data presentation The application supplied on three 1 44 MB 312 floppy disks is designed to operate within the 32 bit environment of Windows 95 and later or Windows NT 4 and later The instrument communicates with the PC using an RS 232 serial port 3 1 Installation on Windows 95 98 ME Windows NT amp Windows 2000 System Requirements IBM compatible PC with Pentium II or better processor At least 16 MB of free RAM space Microsoft Windows 95 98 Windows NT Hard drive with at least 4 MB of free space RS 232 Serial Communication Port 312 high density 1 44 MB floppy disk drive for program installation Super VGA colour monitor Printer optional Before installation it is recommended that a back up copy be made of the program disks Keep the originals in a safe place and use the copy to install the software The Setup program for WinHSM will install files in the specified Program directory and also in the Windows System directory 1 Start Windows 2 Insert WinHSM Disk 1 into the floppy disk drive 3 Select Start from the task bar then Run 4 Type a setup where a identifies the floppy disk drive then press Enter 5
41. re or incinerator nor must they be punctured crushed or otherwise mutilated or opened up in anyway NiMH MICROTHERM instruments contain no user serviceable components If an electrical fault is suspected the instrument must be returned to Casella CEL Ltd for repair The instrument and sensors contain delicate components They should not be dropped or subjected to mechanical shock Failure to comply will render the warranty invalid Page 3 of 44 Getting Started MICROTHERM Heat Stress WBGT amp WinHSM Application Software User Manual GETTING STARTED It is suggested that you prepare and operate your Microtherm following the sequence of sections in the Operations Chapter Preparation Measurement Logging Page 4 of 44 MICROTHERM Heat Stress WBGT amp Contents WinHSM Application Software User Manual TABLE OF CONTENTS 1 DESCRIPTION OF THE MICROTHERM 7 1 1 Background se s a eR das Gm See Be ee oe a a 7 1 2 DESCHIDIION s s Gb abe Bh ed Uk apri ee he G 8 1 3 The Sensor ATAY e 4602 4 28 ba babe we pe os 9 1 4 The Microtherm Menu Structure 2 10 15 Alarm Output RS 232 Socket aoaaa aaa aa 11 1 6 Schedule OF Parts o e ec sca sed eere he eo os 11 2 OPERATION 2 2 0 ee ee eee te ee 13 2 1 Preparation for Use 0 13 241 Power Supply s lt s sosa 45 462 546 4 oho 4 13 2 1 2 Temperature Sensor Array 2 14 2 2 Preliminary
42. ress legislation is written in terms of C threshold alarm settings can be specified only in increments of C However the equivalent F value is also shown Press to accept the settings and return to the Configuration menu Calibration The sensors are manufactured to high standards of accuracy stability and sensitivity so that separate calibration is not normally required 2 4 Measurement For most consistent measurement stay at least 20 minutes on each station Page 20 of 44 MICROTHERM Heat Stress WBGT amp Operation WinHSM Application Software User Manual 1 If not already on press O to swith ON A welcome screen will be displayed showing the instrument s name This will be followed for a brief period by the status screen 1 Dec 10 25 55 Battery 4 9volts Charger Off Ignore the displayed voltage Memory 2 Full Rune 1 32 hen external power is being Version NN NN N used UserName and Details MTHO5 And finally by the measurement screen 4 in out gt av WBGTin 24 2 oc 24 0 c Dew 23 7 23 8 RH 98 3 Tnw 22 1 WATERLOW WBGTinTWA c MTHO2 This displays the following measured or calculated parameters WBGTin Wet bulb globe temperature indoors Ta Air temperature Tg Globe temperature Tnw Natural wet temperature WBGTin TWA Wet bulb globe temperature indoors time weighted average given as a rolling 60 minute average every 30 secon
43. scientific instrument which should not be exposed to excessive moisture vibration or physical shocks The following steps must be performed before your Microtherm can be used under operating conditions It is suggested that you follow the sequence of sections in this chapter 2 1 Preparation for Use 2 1 1 Power Supply Infrared Interface l 12 V DC RS 232 The Microtherm is powered by Power __ 7 four AA size batteries located in a Gea AD compartment in the underside of the instrument The instrument can also be 00058 Tripod Bush powered continuously using Figure 6 Bottom panel connectors external power applied via the 12 V DC socket Figure 6 Slide Off without the need for internal Lift End batteries to be installed To gain to access to the batteries liftthe Release bottom end of the cover slightly Ver to release it then slide 00021 downwards in the direction of the Figure 7 Removing battery cover arrow mark Figure 7 Warning One cell installed with the wrong polarity may still allow operation but can cause overheating severe enough to rupture a cell and Figure 8 Loading batteries damage the instrument 00015 Load four new batteries AA or equivalent in the orientations shown in Figure 8 Rechargeable nickel cadmium NiCd 1 2 V batteries are recom mended 1 5 volt alkaline and other non rechargeable batteries can also be used Rechar
44. t other fields and lt or gt to edit the entries When all entries on the Set Clock screen are correct press to accept the settings and return to the Time amp Date screen Specify the serial communication details by pressing while highlighting the Serial Comm s option on the Configuration menu Serial Comms lt gt Baud Rate DJJ Data Bits 8 StopBits 1 Parity None MTH16 The Serial Comms screen is displayed where the only setable parameter is Baud Rate Use lt or gt to edit the entry in the Baud Rate field Page 19 of 44 Operation MICROTHERM Heat Stress WBGT amp WinHSM Application Software User Manual 16 17 18 19 20 21 22 2 3 When the entry matches the requirements of your PC also see Section 3 3 1 press to accept the setting Specify whether the measurement units should be C or F by pressing while highlighting the Units C F option on the Configuration menu Use lt or ES to select the required units Press to accept the setting Specify alarm requirements by pressing while highlighting the Buzzer Alarm option on the Configuration menu The Buzzer Alarm screen is displayed Buzzer Alarm 4bav Buzzer Alarm WBGT Threshold 30 0 C 86 0 F MTH18 Choose from the following options Buzzer Disable Enable Alarm WBGT WBGTtwa Disable Ta Threshold 0 0 to 40 0 C in 0 1 steps As the majority of heat st
45. tion 2 5 1 2 Highlight the Clear Memory option select YES then press Ge A warning message will be displayed asking for confirmation before the contents of the memory are erased 3 Press to confirm the erase operation ALL stored runs will be DELETED 2 5 3 Start Logging 1 With the logger settings configured as described in Section 2 5 1 and the memory cleared when necessary display the Logger screen Page 23 of 44 Operation MICROTHERM Heat Stress WBGT amp WinHSM Application Software User Manual Logger Start Logger View Runs Config Logger Memory 2 Full Runs 1 32 MTHO6 2 Highlight the Start Logger option and press to start logging 05 32 4dHAV BGTin 24 2 24 0 Dew 23 7 23 8 RH 98 3 22 1 WATERLOW WBGTin TWA MTHO8 The measurement screen displays levels from the current interval 3 Press lt and gt to switch between displays with WBGT indoor and WBGT outdoor values 4 Press A and V to switch between the measurement screen and a graph of one of the parameters 2 3 05 32 MTHO7 24 0 15min Both screens identify the run and show the current interval number Data stored during the current or other runs can be reviewed on the instrument display while it is being collected 5 From the Logger screen select and display the View Runs screen Run Number 1 2 lt gt Date Fri i Dec Start 16 10 57 Duration 1 29 44
46. to heat stress and one such index is the Wet Bulb Globe Temperature Index The WBGT index was initially developed to provide a simple method for assessment of heat stress among military personnel The Microtherm Heat Stress WBGT determines two WBGT values For inside applications and outside measurements with no solar load the WBGT inside value is used WBGTin 0 7tnw 0 3ta For outside measurements with solar load the WBGT outside value is used WBGTout 0 7tnw 0 2tg 0 1ta Higher exposures to heat than those shown in Table 1 are permissible if the workers have been undergoing medical surveillance and it has been established that they are more tolerant to work in heat than the average worker Workers should not be permitted to continue their work when their deep body temperature exceeds 38 C Page 7 of 44 Description MICROTHERM Heat Stress WBGT amp WinHSM Application Software User Manual Table 1 Permissible Heat Exposure Threshold Limit Values values are given in C WBGT Work Regimen Work Load Light Moderate Heavy Continuous Work 30 0 27 7 25 0 75 Work 30 6 28 0 25 9 25 Rest Each Hour 50 Work 31 4 29 4 27 9 50 Rest Each Hour 25 Work 32 2 31 1 30 0 75 Rest Each Hour 1 2 Description The Casella Microtherm Heat Stress Wet Bulb Globe Temperature WBGT monitor is shown in Figure 1 Sensor array g gt Globe temperature sensor Radiation shi
47. tteries become discharged logging is terminated and the instrument will commence an automatic shut down sequence The battery voltage will be shown as 10 V while external power is being applied 2 2 3 Configuring for the Current Measurement The Configuration menu enables all functions for the instrument s current operating mode to be defined fi With the Main menu on display see Section 2 2 2 use V or A to highlight the Configuration option 2 Press to display the Configuration menu Page 17 of 44 Operation MICROTHERM Heat Stress WBGT amp WinHSM Application Software User Manual CONFIGURATION av Back Light Time amp Date Language SerialComm s Units C F Buzzer Alarm MTH12 3 Specify the user language by pressing while highlighting the Language option The following languages are available English Fran aise Deutsch Italiano Espa ol 4 Use V or A to highlight the required language 5 Press to select the language and return to the Configuration screen 6 Specify the display back light function by pressing while high lighting the Back Light option VA Choose from the following options Light ON The display is lit as you leave this screen It remains lit until switched off Light OFF Switches the backlight off Keypress ON The display is lit each time a key is pressed while viewing a menu It remains lit for the duration set Duration Sets the duration ti
48. verheating severe enough to rupture a cell and Figure 8 Loading batteries damage the instrument 00015 Load four new batteries AA or equivalent in the orientations shown in Figure 8 Rechargeable nickel cadmium NiCd 1 2 V batteries are recom mended 1 5 volt alkaline and other non rechargeable batteries can also be used Rechargeable batteries may be supplied by Casella CEL in a discharged state In order to obtain maximum capacity from new NiCd batteries several charge and discharge cycles may be required Page 13 of 44 Operation MICROTHERM Heat Stress WBGT amp WinHSM Application Software User Manual Warning DO NOT enable the charger circuit while non rechargeable batteries are installed REA Factory The instrument has a built in use only fast charging circuit that uses Serial Number Label DO NOT power applied via the 12 V DC ADJUST socket shown in Figure 6 This allows rechargeable batteries to be Charger recharged in situ Enable When rechargeable batteries are to be charged in situ set the Charger Enable DIP switch to ON as shown in Figure 9 00060 Figure 9 Location of DIP switches Charging will terminate automatically once the batteries are fully charged which takes approxi mately 3 hours for fully discharged batteries 2 1 2 Temperature Sensor Array The detachable sensor array houses three platinum resistance temperature detectors
49. xtension Cable 5 5 CE Compliance The Microtherm Heat Stress WBGT complies with the EMC Directive 89 336 EEC of the European Union It has been tested according to the standard delivery schedule and complies with the following standards EN 50081 1 1992 EN 50081 2 1993 Generic emission standards for resi dential commercial light industry and industrial environments EN 50082 1 1992 EN 50082 2 1995 Generic immunity standards for both RF fields and electrostatic discharge for resi dential commercial light industry and industrial environments EN 61000 4 2 1995 IEC 61000 4 2 1995 Electromagnetic compatability EMC Testing and measurement techniques Electrostatic discharge immunity test Page 44 of 44 Kebon P RODUC T Thank you for reading this data sheet For pricing or for further information please contact us at our UK Office using the details below UK Office Keison Products P O Box 2124 Chelmsford Essex CM1 3UP England Tel 44 0 1245 600560 Fax 44 0 1245 808399 Email sales keison co uk Please note Product designs and specifications are subject to change without notice The user is responsible for determining the suitability of this product
50. y by inserting the cable connector into the socket in the top end of the instrument case with the red dot facing the front of the instrument to ensure correct pin location then turn the large knurled ring to tighten the security collet Remember to free the collet before attempting to remove the sensor array In use the sensor array must be maintained with the crossbar horizontal to prevent spillage from the water container during the duration of a typical measurement which should take at least 20 minutes on each station This is best achieved by standing the instrument on its foot on a horizontal surface as shown in Figure 10 mounting the instrument on a tripod available from Casella CEL or by using an extension cable to allow the sensor array to be installed on a tripod Extension cables are available with a standard length of 10 m The maximum distance between sensors and instrument is 50 m Page 14 of 44 MICROTHERM Heat Stress WBGT amp Operation WinHSM Application Software User Manual 1 4 Whitworth 3 Foot Permanently 00063 1 4 UNC Tripod Bush Attached Figure 10 The Microtherm standing on a horizontal surface The reservoir cap is a tight push fit with an O ring seal 1 4 2 2 Use only distilled water and fill the reservoir up to the line engraved inside Over filling may cause the water to siphon out of the container Replace the cap after fil
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