Model HTA4200 User Manual
Contents
1. PACER INSTRUMENTS By Miltronics Mfg Inc Phone 603 352 0187 95 Krif Road Fax 603 352 1036 Keene NH 03431 USA sales pacer instruments com PACER INSTRUMENTS Pacer Instruments by Miltronics 95 Krif Road Keene New Hampshire 03431 USA 800 283 1141 603 352 0187 Fax 603 352 1036 sales pacer instruments com www pacer instruments com Copyright 2008 Pacer Instruments Inc Pacer Pacer Instruments HTA4200 AP275 AP100 HTP201 and the Pacer Instruments logo are trademarks of Pacer Instruments Inc HTA4200 User Manual Pacer Instruments Rev 2 0 15 May 2009 www pacer instruments com Copyright 2008 Pacer Instruments Inc Page 20 of 20 PACER INSTRUMENTS By Miltronics Mfg Inc Phone 603 352 0187 95 Krif Road Fax 603 352 1036 Keene NH 03431 USA sales pacer instruments com PACER INSTRUMENTS Model HTA4200 DIGITAL HYGRO THERMOMETER ANEMOMETER DATALOGGER User Manual HTA4200 User Manual Pacer Instruments Rev 2 0 15 May 2009 www pacer instruments com Copyright 2008 Pacer Instruments Inc Page 1 of 20 PACER INSTRUMENTS By Miltronics Mfg Inc Phone 603 352 0187 95 Krif Road Fax 603 352 1036 Keene NH 03431 USA sales pacer instruments com INTRODUCTION Pacer s model HTA4200 digital hygro thermometer anemometer is a versatile instrument for measuring and logging air velocity relative humidity and temperature of airflo2. 352 1036 Keene NH 03431 USA sales pacer instruments com APPENDIX G ANALOG OUTPUTS TEMPERATURE Range 148 to 572 F 100 to 300 C Scale 360 F V 200 C V Offset 0 4111V for F 0 5V for C Example For Vout 1V F temp is 1 0 4111 V x 360 F V 212 F C temp is 1 0 5 V x 200 C V 100 C RELATIVE HUMIDITY Range 0 to 100 RH Scale 50 RH V Example For Vout 1V RH is 1V x 50 RH V 50 RH AIR VELOCITY Range 0 to 7935 FPM 0 to 40 31 MPS Scale 3967 5FPM V 20 155 MPS V Example For Vout 1V Velocity in FPM 1V x 3967 5FPM V 3967 5FPM Velocity in MPS 1V x 20 1S5SMPS V 20 155MPS NOTES HTA4200 User Manual Pacer Instruments Rev 2 0 15 May 2009 www pacer instruments com Copyright 2008 Pacer Instruments Inc Page 16 of 20 PACER INSTRUMENTS By Miltronics Mfg Inc 95 Krif Road Keene NH 03431 USA Battery check Display HTP201 RH probe Options Available Additional velocity probe Extension cables Specify length Extra extension rod Sinter filter for RH probe Included 1 Air Velocity Probe 1 RH Probe Phone 603 352 0187 Fax 603 352 1036 sales pacer instruments com Automatic low battery display 0 5 LCD 4 digits Data acquisition Storage capacity up to 999 triple measurements of humidity temperature and air velocity with manual SAVE Data link Standard RS 232C at 1200 baud including handshake signals CT
3. LF line feed At the end of transmission the instrument generates an EOF end of file character The PC can then return to the OS HTA4200 User Manual Pacer Instruments Rev 2 0 15 May 2009 www pacer instruments com Copyright 2008 Pacer Instruments Inc Page 15 of 20 PACER INSTRUMENTS By Miltronics Mfg Inc Phone 603 352 0187 95 Krif Road Fax 603 352 1036 Keene NH 03431 USA sales pacer instruments com APPENDIX D AIRFLOW VOLUME CALCULATIONS To calculate cubic feet per minute CFM from a measured air velocity FPM you need the calculated cross sectional area of the air flow stream Volume Flow CFM Velocity FPM X Area sq ft In a rectangular duct this cross sectional area equals the Width times the Height 0 W x H A cross sectional area In a circular duct this cross section area equals the radius squared times n 3 14 OG R x R x 3 14 A cross sectional area To convert an area calculated in square inches to an area calculated in square feet which is required for the Volume Flow equation above divide by 144 area in sq in 144 area in sq ft Example The air duct is rectangular the width is 24 in and the height is 12 in The air velocity reading through the duct is 450 FPM Calculate the Volume Flow Step 1 Cross sectional area 24 in x 12 in 288 sq in Step 2 288 sq in 144 2 sq ft Step 3 Volume flow Air Velocity x Area therefore Volume flow r
4. Pressing AVG key sets measurement period to sixteen seconds The display will show HTA4200 User Manual Pacer Instruments Rev 2 0 15 May 2009 www pacer instruments com Copyright 2008 Pacer Instruments Inc Page 7 of 20 PACER INSTRUMENTS By Miltronics Mfg Inc Phone 603 352 0187 95 Krif Road Fax 603 352 1036 Keene NH 03431 USA sales pacer instruments com 16 S for 16 sec then a measurement value It will update every two seconds with average of the preceding sixteen seconds Press RESET to return to normal 2 second averaging period RESET Pressing RESET key will switch the unit back to normal measurements after using the Max Min Datalog Average or Dew Point modes SAVE Pressing SAVE during a measurement mode will store a data triple consisting of the RH temperature and air velocity values being measured at that instant for a maximum of 999 data triples MAX MIN Pressing MAX MIN key displays the highest reading since turn on for the parameter being measured independent of any SAVED values Pressing key again will display lowest reading since turn on See APPENDIX C for description of algorithm that determines MAX and MIN NOTE Press RESET to return to measuring DATALOG Pressing the DATALOG key while still in MAX MIN mode see above will display the maximum or minimum of the SAVED data points if any EXAMPLE After pressing key view H
5. TERMINATED ead eoren FOR ATTACHING TO INSTRUMENT S2orien 6 09 inch i 23 5 mm 155 mm HTA4200 User Manual Pacer Instruments Rev 2 0 15 May 2009 www pacer instruments com Copyright 2008 Pacer Instruments Inc Page 6 of 20 PACER INSTRUMENTS By Miltronics Mfg Inc Phone 603 352 0187 95 Krif Road Fax 603 352 1036 Keene NH 03431 USA sales pacer instruments com APPENDIX E RS 232C CABLE PINOUTS RS 232C SERIAL CABLE PIN OUT COLOR CODE PIN no SIGNAL COLOR PIN SUBD 4 POLE FEM 5 1 GND GRN 2 2 TXD BRN 7 3 CTS GRA 8 4 RTS WHT APPENDIX F DATA COMMUNICATIONS The instrument provides an RS 232 data output The voltage levels are plus and minus 9V A voltage of 9V represents a space logical 0 A voltage of 9V represents a mark logical 1 The protocol is 1 start bit 7 data bits 1 odd parity bit 1 stop bit ASCII data format 1200 baud Sample data items 001 34 7 RH 76 9 dgF 2385 FPM 002 34 7 RH 24 9 dgC 12 12 MPS RS 232 Data Pin out Connections Signal 4P Female 9 pin Printer Gnd 1 5 7 Transmit TXD 2 2 2 Clear send CTS 3 7 5 Ready send RTS 4 8 4 After pressing the DUMP key an RTS 1 appears on the RS 232 cable The PC or printer must respond with a CTS 0 within 1 second if not an E 04 shows and DUMP mode ends If hand shaking occurs ASCII data transfers at 1200 baud Each data line record is terminated with a CR carriage return and
6. DES K 02 Data logger is filled to maximum capacity of 999 SAVED measurements E 03 Storage is empty No measurements have been SAVED since last time memory was cleared K 04 No communication is occurring through the RS232 data link with the printer or PC E 06 Relative humidity is below range lt 3 0 RH E 07 Relative humidity is above range gt 97 0 RH E 08 Temperature is below range lt 99 9 C or F E 09 Temperature is above range gt 300 0 C or gt 575 F E 10 Relative humidity is not within the range of 3 0 to 97 0 RH necessary for calculating dew point K 11 Temperature is not within the range of 5 to 175 F or 20 to 80 C necessary for calculating dew point E XX Error codes of 50 or higher are internal errors In this case contact the manufacturer HTA4200 User Manual Pacer Instruments Rev 2 0 15 May 2009 www pacer instruments com Copyright 2008 Pacer Instruments Inc Page 12 of 20 PACER INSTRUMENTS By Miltronics Mfg Inc Phone 603 352 0187 95 Krif Road Fax 603 352 1036 Keene NH 03431 USA sales pacer instruments com SECTION 3 OPERATIONAL NOTES NOTE Unit should be OFF before changing batteries or attaching cables 1 Remove battery compartment lid and insert battery replace lid 2 Attach the probe cable s by aligning the keyway s inserting connector s and turning collar s to tighten You ma
7. S and RTS Weight 24 4 ounces with probe Dimensions Instrument 7 5 x 3 2 x 1 2 APT275 probe 2 34 diameter APT100 probe 1 diameter 7 length x 1 diameter APT100 1 or APT275 2 3 4 PN 3831 air velocity probes PN 3833 HTP201 probe PN 5001 rigid PN 5002 flexible PN 3901 for harsh environments Choice APT100 or APT275 PN HTP201 3 pieces PN 5001 Rigid Extension Rod 1 piece PN 5002 Flexible Extension Rod 1 piece PN 3830 5 Air Velocity Cable piece PN 3843 5 RS 232C Cable 1 piece PN 3839 5 Analog Output Cable 1 piece 9V Alkaline Battery 1 piece PN 3894 Hard shell Harrying Hase 1 set PN 3895 Foam Case Insert 1 piece Operation Manual HTA4200 User Manual Rev 2 0 15 May 2009 Copyright 2008 Pacer Instruments Inc Pacer Instruments www pacer instruments com Page 5 of 20 PACER INSTRUMENTS By Miltronics Mfg Inc Phone 603 352 0187 95 Krif Road Fax 603 352 1036 Keene NH 03431 USA sales pacer instruments com Dimensions MOUNTING BOSS WITH 02 75 INCH 3 8 16 UNC TAPPED HOLE APT275 PROBE 70MM 750 INCH DEEP ELECTRICAL CONNECTOR 875 INCH 22 MM 4 9 INCH n 1 7 010 INCH 124 MM APT100 PROBE 3 8 16 TAPPED HOLE Eee 0 75 INCH DEEP 61 0 inch smm fe A WZ e q O 1 1 inch Pee a 28 mm E 5 5 inches X 140 mm a HTP201 PROBE
8. ate 450 FPM x 2 sq ft 900 CFM HTA4200 User Manual Pacer Instruments Rev 2 0 15 May 2009 www pacer instruments com Copyright 2008 Pacer Instruments Inc Page 14 of 20 PACER INSTRUMENTS By Miltronics Mfg Inc Phone 603 352 0187 95 Krif Road Fax 603 352 1036 Keene NH 03431 USA sales pacer instruments com SECTION 2 SWITCH FUNCTIONS MODEL HTA4200 DIGITAL HYGRO THERMOMETER ANEMOMETER DATALOGGER DEW PNT REL HUM AIRFLOW fee f max on CLS LS 8 Cas ON OFF Pressing ON OFF key switches unit ON Pressing the key a second time turns it OFF FPM MPS Pressing FPM MPS key toggles unit from FPM 1 FPM resolution to MPS 0 01 MPS resolution both with average of 2 second measurement period FPC Pressing the FPC key displays temperature in degrees Fahrenheit F pressing key a second time changes display to Celsius C Readings are updated 2 5 times second NOTE The small slide switch at top chooses probe from which temperature is read RH Pressing RH key displays relative humidity with 0 1 RH resolution updated 2 5 times second DEW PNT Pressing DEW PNT key displays calculated dew point in F with 0 1 F resolution Pressing the key a second time displays dew point in C with 0 1 C resolution NOTE To shift directly to temperature from dew point press RESET before pressing FPC AVG Applies only to air velocity
9. cer products both personally and through our literature it is still the total responsibility of the customer to determine the suitability of the product for use in their application This manual is provided by Pacer Instruments without any kind of warranty Precautions have been taken in accurately preparing this manual however we neither assume responsibility for any omissions or errors that may appear nor assume liability for any damages that result from the use of the products in accordance with the information contained in the manual HTA4200 User Manual Pacer Instruments Rev 2 0 15 May 2009 www pacer instruments com Copyright 2008 Pacer Instruments Inc Page 3 of 20 PACER INSTRUMENTS By Miltronics Mfg Inc Phone 603 352 0187 95 Krif Road Fax 603 352 1036 Keene NH 03431 USA sales pacer instruments com SECTION 1 SPECIFICATIONS Ranges Air Probe APT275 40 to 7800 ft min feet per minute 0 2 to 40 00 m sec meters per second Air Probe APT 100 60 to 6800 ft min 0 3 to 35 00 m sec Relative Humidity RH 5 0 to 95 0 RH Temperature using combination HTP201 probe 4 to 176 F 20 to 80 C 22 to 212 F 30 to 100 C Temperature using Air Probes Accuracy Air Velocity with APT275 1 0 of reading 1 digit Air Velocity with APT100 1 0 of reading 1 digit Relative Humidity 2 0 RH Temperature 0 3 C 0 2 of reading in C Temperature accuracy exa
10. e Transfer menu 5 Select Stop 6 The data is now in the file named in step E2 H Select Exit under the File menu 1 Note message You are currently connected Are you sure you want to disconnect now 2 Click Yes 3 If the message Do you want to Save Session appears click Yes 4 Your data is now downloaded and saved I Instructions for moving transferred data into an Excel spread sheet 1 Find and open the data file created in G above 2 The Open With window should appear 3 Select Notepad and open the file 4 Select any amount of data and execute Copy 5 Open a new Excel spreadsheet execute Paste 6 The A column now contains the data J Split data into temperature humidity and air velocity 1 Under Data menu select Text to columns and click Next in the open window 2 Use the directions to place column breaks After the column breaks are in place click Finish HTA4200 User Manual Pacer Instruments Rev 2 0 15 May 2009 www pacer instruments com Copyright 2008 Pacer Instruments Inc Page 11 of 20
11. elocity increases C This 2 higher MAX at C will register as the velocity decreases replacing 1 MAX D This 2 MIN at D is higher than the MIN already registered and will be ignored E This 4 MIN at E is lower than the Ist MIN registered at B and will replace it The zero crossing at F does not form a MIN and will be ignored This protects against false MIN readings when the probe is withdrawn from the air stream HTA4200 User Manual Pacer Instruments Rev 2 0 15 May 2009 www pacer instruments com Copyright 2008 Pacer Instruments Inc Page 13 of 20 PACER INSTRUMENTS By Miltronics Mfg Inc Phone 603 352 0187 95 Krif Road Fax 603 352 1036 Keene NH 03431 USA sales pacer instruments com APPENDIX A CONNECTOR OUTPUTS Connector Pinouts Vire Code top view kawar shield GND AIR VELOCI 4 6 3 o ae O 0 0 o O 3 2 4 0 2 ROF 3 2 ANALOG RH 3 RS 232 OUT PROBE TEMP SWITCH OUT ANALOG OUT CABLE RH PROBE AIR VELOCITY CABLE RS 232 CABLE PIN 1 GND BLK PIN1RTD1a GRN PIN 1 S L PRB GRA PIN1 GND GRN PIN2 TEMP OUT GRN PIN2GND BRN PIN2PULSEQUTWHT PIN2TXD BRN PIN 3 RH OUT GRA PIN3 RHINGRA PIN3 V RED PIN3CTS GRA PIN 4 VELOCITY OUT WHT PIN 4 V WHT PIN 4 DIG GND BLK PIN4 RTS WHT PINS RTD2a YEL PINS RTD1a BRN PIN 6 RTD2a YEL PIN 7 RTD2b BLU NOTE Slide TEMP SWITCH toward the RH PROBE or AIR VELOCITY PROBE connector to display temperature from that probe respectively APPENDIX B ERROR CO
12. followed by value 1056 followed by sample number P038 which contains that value NOTE You will see only the value referring to the parameter you are currently measuring air velocity in above example If you want the SAVED max min for say temperature you need to press RESET FPC MAX MIN and DATALOG to read the sample number and value of the highest or lowest stored temperature DUMP Pressing the DUMP key will transfer the SAVED measurements to a connected printer or PC Measurements will be retained for at least 1 year or until memory is cleared by holding the DUMP key when turning unit on ANALOG OUTPUT Analog outputs for temperature RH and airspeed provide 0 2V FS See APPENDIX G for details HTA4200 User Manual Pacer Instruments Rev 2 0 15 May 2009 www pacer instruments com Copyright 2008 Pacer Instruments Inc Page 8 of 20 PACER INSTRUMENTS By Miltronics Mfg Inc Phone 603 352 0187 95 Krif Road Fax 603 352 1036 Keene NH 03431 USA sales pacer instruments com APPENDIX C MIN MAX CALCULATIONS 1800 2ND MAX HIGHEST MAX R 1600 1400 1 1200 1000 800 500 1ST MIN 400 T 200 ZERO CROSSING NOT ATH MIN Y REFLECTED IN MIN READING LOWEST MIN 0 F 0 2 4 6 8 101214 1618202224 26 28 ELAPSED TIME A 1 MAX reading also first minimum reading to be replaced at B B 1 MIN at B is the lowest yet and will be registered as v
13. mples 0 3 C at 20 C 0 5 F at 68 F Resolution Air Velocity 1 ft min or 0 01 m sec Relative Humidity 0 1 RH Temperature 0 1 F or 0 1 C 1 F below 99 0 F Operating Temperature Instrument 32 to 125 F 0 to 50 C Air Probes 22 to 212 F 30 to 100 C HTP202 Probe 4 to 176 F 20 to 80 C Power Supply 9V Alkaline Battery Optional 9V Wall Transformer Power Battery Life Approx 30 hours HTA4200 User Manual Rev 2 0 15 May 2009 Copyright 2008 Pacer Instruments Inc Pacer Instruments www pacer instruments com Page 4 of 20 PACER INSTRUMENTS By Miltronics Mfg Inc Phone 603 352 0187 95 Krif Road Keene NH 03431 Fax 603 352 1036 USA sales pacer instruments com APPENDIX H LOOK UP TABLES FOR PROBES Probe Output Hz HTA4200 User Manual Rev 2 0 15 May 2009 Copyright 2008 Airspeed Airspeed Airspeed AP100 Probe AP275 Probe FPM MPS FPM 115 2 058 996 1773 090 1628 Ooo S y S S po 9B po S d BOBA ee U L 73S Pacer Instruments Inc Airspeed MPS 0 26 0 34 0 50 0 82 0 98 1 14 1 30 1 46 1 62 1 78 3 39 4 99 8 20 9 81 11 41 13 02 14 62 16 23 17 83 19 44 21 04 22 65 24 25 25 86 27 46 29 07 30 67 32 28 33 88 35 49 37 09 37 90 Pacer Instruments www pacer instruments com Page 17 of 20 PACER INSTRUMENTS By Miltronics Mfg Inc Phone 603 352 0187 95 Krif Road Fax 603
14. s Rev 2 0 15 May 2009 www pacer instruments com Copyright 2008 Pacer Instruments Inc Page 9 of 20 PACER INSTRUMENTS By Miltronics Mfg Inc Phone 603 352 0187 95 Krif Road Fax 603 352 1036 Keene NH 03431 USA sales pacer instruments com 7 To get maximum readings since turn on press MAX MIN key to get minimum readings press MAX MIN key a second time For explanation of the displayed views see MAX MIN paragraph in SECTION 2 For explanation of algorithm which calculates MAX and MIN see APPENDIX C 8 To SAVE the displayed reading see SAVE in SECTION 2 press the SAVE key To dump data to a PC see SECTION 4 SECTION 4 INSTRUCTIONS FOR DUMPING MEMORY For use with Win 95 98 NT4 2000 and Win XP computers using resident HyperTerminal See APPENDIX F for data explanation A Open HT If a configured HT file already exists open it and go to E 1 Click Start button on task bar 2 Open Programs window 3 Open Accessories window 4 Open Communications window HyperTerminal folder Win 95 5 Start HyperTerminal program B The Connection Description window comes up 1 Under Name type Pacer Terminal 2 Choose an icon or accept default 3 Click OK C The Connect To or Phone Number Win 95 window comes up 1 In Connect using box select the Com port you will use probably Com1 if not o
15. t back to us for calibration each year beginning one year after purchase Our calibration services include ensuring the instrument performs within its accuracy tolerance making any necessary adjustments and inspecting all aspects of the instrument s functionality so that you ll have another year of dependable service NIST Traceable multi point calibration is also available from the factory We can offer precise calibration tailored to your specific measurement needs using our state of the art facilities and calibration equipment Please contact us or visit our website for the latest information on calibrating your instrument HTA4200 User Manual Pacer Instruments Rev 2 0 15 May 2009 www pacer instruments com Copyright 2008 Pacer Instruments Inc Page 18 of 20 PACER INSTRUMENTS By Miltronics Mfg Inc Phone 603 352 0187 95 Krif Road Fax 603 352 1036 Keene NH 03431 USA sales pacer instruments com Warranty This product is fully warranted against defective materials and or workmanship for a period of one year after purchase provided it was not improperly used For your protection please use this product as soon as possible If returned it must be securely wrapped sent prepaid and insured to Pacer Instruments by Miltronics 95 Krif Road Keene New Hampshire 03431 USA Please include a note with name address telephone number and description of the problem Although we provide assistance on Pa
16. therwise in use 2 Click OK D The Com Properties window comes up 1 Set Bit per second to 1200 2 Set Data bits to 7 3 Set Parity to odd 4 Set Stop bits to 1 5 Set Flow control to Hardware click Apply and OK 6 Under File menu click Properties 7 In Pacer Terminal Properties window click Settings tab 8 Click ASCH Setup box at bottom right HTA4200 User Manual Pacer Instruments Rev 2 0 15 May 2009 www pacer instruments com Copyright 2008 Pacer Instruments Inc Page 10 of 20 PACER INSTRUMENTS By Miltronics Mfg Inc Phone 603 352 0187 95 Krif Road Fax 603 352 1036 Keene NH 03431 USA sales pacer instruments com 9 Check Force incoming data to 7 bit ASCII under ASCII Receiving 10 Click OK in Properties windows then click Save under File menu E Under the Transfer menu select Capture Text 1 The Capture Text window appears 2 Type in a name for the data file you re creating 3 Click Start F Connect the cable from the HTA4200 1 Connect the RS232 cable to the serial port 2 Turn on the HTA4200 G Transfer the data 1 Press the FPC and Dump keys 2 The flowing data will now appear in the Pacer Terminal window 3 Wait until the data has finished transferring 4 Highlight Capture Text under th
17. w from HVAC ducts or process air flow Included are an RS232C output port with 9 pin serial cable and an analog output with cable Temperature is selectable from either the air velocity probe or the RH probe The heavy all metal air velocity probe can be used for airstreams which have a wide range of humidity temperature and contaminants without compromising accuracy Temperature sensors are platinum resistance elements RTD and the humidity sensor is a fast accurate capacitive thin film ceramic model Features of the air velocity probe include choice of diameters custom cable lengths tolerance of temperatures up to 210 F 98 9 C and durability A sintered metallic filter is available for the RH probe to protect it from dust HTA4200 User Manual Pacer Instruments Rev 2 0 15 May 2009 www pacer instruments com Copyright 2008 Pacer Instruments Inc Page 2 of 20 PACER INSTRUMENTS By Miltronics Mfg Inc Phone 603 352 0187 95 Krif Road Fax 603 352 1036 Keene NH 03431 USA sales pacer instruments com Notes HTA4200 User Manual Pacer Instruments Rev 2 0 15 May 2009 www pacer instruments com Copyright 2008 Pacer Instruments Inc Page 19 of 20 PACER INSTRUMENTS By Miltronics Mfg Inc Phone 603 352 0187 95 Krif Road Fax 603 352 1036 Keene NH 03431 USA sales pacer instruments com CALIBRATION To maintain your instrument in top working order we recommend that you send i
18. y use either probe by itself or both simultaneously If no RH probe is attached unit will display error codes for temperature or RH when pressing those keys See APPENDIX A for unit s connector wiring diagram 3 Press the ON OFF key to turn unit ON The display will show all elements followed by the remaining battery capacity 8 2 means the battery is at 8 2V followed by P and a 3 digits 1 e P025 which means 24 data points are stored If the DUMP key in held when pressing ON OFF key at turn on the data point memory will be cleared NOTE If the battery drops below 6V during use an L will be displayed in the leftmost digit 4 To view airspeed press FPM MPS key to display desired units Place probe in the air stream with the axis or direction arrow if present in the direction of airflow To calculate volume flow rate see APPENDIX D 5 To correctly measure the air velocity from a large duct set unit to AVG mode and move probe about the area of the opening After 16 seconds the unit will display the velocity for the preceding 16 seconds updating after that every 2 seconds by adding the latest 2 second measurement and dropping the oldest 2 second measurement 6 To view temperature or RH press F C or RH keys respectively and place probe in area to be measured See APPENDIX B if E xx error xx is displayed HTA4200 User Manual Pacer Instrument
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