Model 8720/8722 TH-Calc Manual
Contents
1. Arrow Keys AV The two arrow keys are used to scroll through and select values as needed for TH CALC functions They are also used while in field calibration mode On the Model 8722 pressing either A or Wkey on the start up sequence while baud rate time or barometric pressure are displayed will allow you to change them Use the A or Wkey to adjust and press ENTER to accept Printing Data Using the Optional Portable Printer If the optional Portable Printer is connected the following will be printed while pressing the following keys On the Model 8720 e SAMPLE key SAMPLE TIME time units AVG top line average units AVG bottom line average units e STATISTICS key SAMPLE TIME time units 12 Chapter 3 STATISTICS again AVG top line average units AVG bottom line average units STATISTICS again MAX top line max units MAX bottom line max units STATISTICS again MIN top line min units MIN bottom line min units On the Model 8722 SAMPLE key top line sample sample value units bottom line sample sample value units STATISTICS key AVG top line samples avg value units AVG bottom line samples avg value units STATISTICS again MAX top line samples max value units MAX bottom line samples max value units STATISTICS again MIN top line samples min value units MIN bottom line samples min value units CLEAR and2. Indoor Air Quality Model 8720 8722 TH CaLc Temperature and Humidity Meters Operation and Service Manual 1980397 Revision D July 2006 Model 8722 TSI Model 8720 8722 TH CaLc Temperature and Humidity Meters Operation and Service Manual SHIP MAIL TO TSI Incorporated 500 Cardigan Road Shoreview MN 55126 3996 USA U S Sales and Customer Service 800 874 2811 651 490 2811 Fax 651 490 3824 INTERNATIONAL Sales and Customer Service 001 651 490 2811 Fax 001 651 490 3824 1980397 Revision D July 2006 E mail address answers tsi com Website http www tsi com EUROPE TSI AB 46 8 595 132 30 Fax 46 8 595 132 39 TSI GmbH 49 241 52 30 30 Fax 49 241 52 30 349 TSI Copyright TSI Incorporated 2000 2006 All rights reserved Address TSI Incorporated 500 Cardigan Road Shoreview MN 55126 USA Fax No 651 490 3824 Limitation of Warranty and Liability effective July 2000 Seller warrants the goods sold hereunder under normal use and service as described in the operator s manual shall be free from defects in workmanship and material for twenty four 24 months or the length of time specified in the operator s manual from the date of shipment to the customer This warranty period is inclusive of any statutory warranty This limited warranty is subject to the following exclusions a Hot wire or hot film sensors used with
3. 5 Using the Optional AC Adapter 5 Selecting the Display Units 5 Baud Rale mn ta ee 6 Setting the Real Time Clock 6 Connecting the Optional Portable Printer 7 Connecting to a Computer 8 Data Acquisition Polling 8 3 Operation 11 Keypad Functions 11 ON OFF Key gen 11 Arrow Keys A F 12 Printing Data Using the Optional Portable Printer 12 Model 8720 Functions u 14 SAMPLE Key 14 TEMP HUMIDITY Key 14 STATISTICS Key usesnnnennnen 14 Model 8722 Functions een 15 ENTER Key arosine latas tdi 15 TEMP KY iii 15 DEWPOINT Key coocccococcccccnconocccninnnccnnnnn cnn 16 HUMIDITY Key coccccciococccccoconocicnnonccanininnnnnn 16 WETBULB Key cooocoocccccococicccononcccnananininonnnos 16 OA Percent Outside Air Key SAMPLE INTERVAL Key SAMPLE Key iiie sonl ugenini iae iit Setting Data Storage Options Discrete Data Logging Single Point Measurements nenn Continuous Data Logging Multiple Readings Over Time NEXT TEST clear Key rn STATISTICS review data Key To View Statistics nnen To Review Data eeens Downloading Data to A Computer A Maintenance uuuuu0nunnannnnnnnnnnnnnnnnnnnnn Probe Tip Hase Recalibration at
4. air It also has the ability to data log determine statistics and recall individual data points The TH CALC Model 8722 will retain data even after it is turned off ENTER Key Press the ENTER key to accept a value or condition In start up mode you can also press and hold the ENTER key to skip the start up sequence TEMP Key Press the TEMP key to view the temperature from the resistive temperature device RTD The letters rtd will display on the top line of the display with the temperature from the RTD on the bottom line Press the TEMP key again to read temperature from the permanent probe Note Ifthe RTD becomes unplugged while in RTD mode the display will read over Ifthe RTD is not plugged in and the TEMP key is pressed nothing will happen Operation 15 DEWPOINT Key Press the DEWPOINT key to display the dew point measurement on the top line of the display HUMIDITY Key Press the HUMIDITY key repeatedly to toggle through the available humidity measurements of e relative humidity RH e Absolute humidity Ibs ft or g m e Humidity ratio Ibs Ib or g kg Absolute humidity and humidity ratio will display in scientific notation The top line displays the number value and the bottom line displays the exponent value WETBULB Key Press the WETBULB key to display the wet bulb measurement on the top line of the display OA Percent Outside Air Key The percent of outside air can be calculat
5. TH CALC for more than a month TSI recommends removing the batteries This prevents possible damage due to battery leakage 27 Chapter 5 Troubleshooting Table 5 1 lists the symptoms possible causes and recommended solutions for common problems encountered with the TH CALC If your symptom is not listed or if none of the corrective actions solve your problem please contact TSI Table 5 1 Troubleshooting the TH CALc Possible Symptom Causes ______ Corrective Action No display Unit not Switch on the switched on unit Low or dead Replace the batteries batteries or plug in the AC adapter contacts contacts Battery Batteries are low Replace or symbol is 15 or less life recharge batteries blinking remaining Display Wrong AC Replace with the reads adapter correct AC LO adapter Low AC line Correct the AC voltage line voltage or use batteries Dirty battery Clean the battery contacts contacts 29 Possible Symptom Causes Corrective Action The TH CALC has detected an internal fault A parameter value is too high Display reads CAL Display reads OVER RTD became unplugged while reading RTD temperature Temperature sensor is still adjusting to temperature You are trying to enter more readings than memory can handle Low lithium battery power Temp initially reads high or low Display reads LOG FULL Display flashes Libatt 30 Return to f
6. baud rate press and hold either Aor V keys during power up sequence while baud rate is displayed Release the key when the TH CALC beeps twice Use the Aor Y keys to scroll through the available values of 1200 2400 4800 9600 and 19 200 Press ENTER to set the value that is displayed Setting the Real Time Clock The TH CALC has an internal clock that keeps track of the time the format is HH MM where HH is the hour in 24 hour format and MM is minutes and the date It is very important to set the time and date correctly 6 Chapter 2 otherwise date and time stamping of recorded data will not be correct To set the time and date press and hold either A or Y keys during the power up sequence when the time is displayed Release the keys when the TH CALC beeps twice You will have an opportunity to view and or change the hours minutes year month and day in sequence Use A or Y key to change any settings Use the ENTER key to store each setting and advance to the next one Connecting the Optional Portable Printer To connect the printer to the TH CALC do the following 1 Ensure that the TH CALC and printer are off 2 Locate the printer interface cable and connect the 9 pin end labeled PRINTER to the printer and the other end to the communications port on the TH CALC monitor 3 Turn on the TH CALC then turn on the printer Note Always turn on the TH CALC before turning on the printer If the printer prints
7. released before 0 CLEAR SAMPLE CLEAR and released at 0 CLEAR LOG MEMORY Operation 13 Note In order to print the baud rate on the TH CALC must be set to the same as the printer The default is 1200 The data will print in a format such as 12 345 67 If you desire the TH CALC can print in a format such as 12 345 67 by switching DIP switch 8 ON See Appendix B for DIP Switch Settings Model 8720 Functions SAMPLE Key Press and release the SAMPLE key to start a sample Press the SAMPLE key again to stop taking a sample The number of seconds sampled will be displayed followed by the average AVG and then the TH CALC will return to measuring in real time The minimum sample time is 5 seconds TEMP HUMIDITY Key Press the TEMP HUMIDITY key to toggle from displaying e Temperature and relative humidity RH e Temperature and dew point e Dew point and relative humidity RH STATISTICS Key Press the STATISTICS key to view time sampled in seconds or minutes and average AVG Press the STATISTICS key repeatedly to toggle through the time sampled average maximum and minimum values for the most recently taken sample If 14 Chapter 3 a printer is attached the average maximum and minimum will print out as they are displayed Model 8722 Functions The TH CALC Model 8722 measures temperature and relative humidity and calculates dew point wet bulb absolute humidity humidity ratio and outside
8. research anemometers and certain other components when indicated in specifications are warranted for 90 days from the date of shipment b Parts repaired or replaced as a result of repair services are warranted to be free from defects in workmanship and material under normal use for 90 days from the date of shipment c Seller does not provide any warranty on finished goods manufactured by others or on any fuses batteries or other consumable materials Only the original manufacturer s warranty applies d Unless specifically authorized in a separate writing by Seller Seller makes no warranty with respect to and shall have no liability in connection with goods which are incorporated into other products or equipment or which are modified by any person other than Seller The foregoing is IN LIEU OF all other warranties and is subject to the LIMITATIONS stated herein NO OTHER EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR PARTICULAR PURPOSE OR MERCHANTABILITY IS MADE TO THE EXTENT PERMITTED BY LAW THE EXCLUSIVE REMEDY OF THE USER OR BUYER AND THE LIMIT OF SELLER S LIABILITY FOR ANY AND ALL LOSSES INJURIES OR DAMAGES CONCERNING THE GOODS INCLUDING 111 CLAIMS BASED ON CONTRACT NEGLIGENCE TORT STRICT LIABILITY OR OTHERWISE SHALL BE THE RETURN OF GOODS TO SELLER AND THE REFUND OF THE PURCHASE PRICE OR AT THE OPTION OF SELLER THE REPAIR OR REPLACEMENT OF THE GOODS IN NO EVENT SHALL SELLER BE LIABLE FOR ANY SPECIAL CONSEQ
9. value Use A and Y to change the adjustment number and press ENTER to accept If necessary repeat the above sequence for the other parameters When finished turn the instrument off and flip DIP switch 7 to off 10 Chapter 2 Chapter 3 Operation Keypad Functions When pressing the keys on the front panel the TH CALC will beep to confirm the function If you press a key and the TH CALC does not beep then the TH CALC does not allow that function during the selected mode WARNING Do not expose the sensing probe to excessive heat it can damage the sensors and probe ON OFF Key Press the ON OFF key to turn the TH CALC on and off When the instrument is first turned on it goes through a preprogrammed power up sequence that includes an internal self check when all displayable items are shown The TH CALC begins by displaying percentage of battery life remaining accurate for alkaline batteries only At this point the Model 8720 will start measuring temperature and relative humidity The Model 8722 also displays the percentage of memory available baud rate time HH MM and entered barometric pressure At this point the Model 8722 will start measuring temperature and relative humidity If a problem is detected the display will light CAL to indicate that it should be returned for servicing and calibration Note To skip the start up displays press ENTER at any time during the power up sequence
10. Always leave DIP switch 1 4 and 7 in the OFF position 36 Appendix B TSI TSI Incorporated 500 Cardigan Road Shoreview MN 55126 U S A Tel 1 651 490 2811 Toll Free 1 800 874 2811 E mail answers tsi com For current information www tsi com P N 1980397 Rev D Copyright 2006 by TSI Incorporated Printed in U S A
11. UENTIAL OR INCIDENTAL DAMAGES SELLER SHALL NOT BE RESPONSIBLE FOR INSTALLATION DISMANTLING OR REINSTALLATION COSTS OR CHARGES No Action regardless of form may be brought against Seller more than 12 months after a cause of action has accrued The goods returned under warranty to Seller s factory shall be at Buyer s risk of loss and will be returned if at all at Seller s risk of loss Buyer and all users are deemed to have accepted this LIMITATION OF WARRANTY AND LIABILITY which contains the complete and exclusive limited warranty of Seller This LIMITATION OF WARRANTY AND LIABILITY may not be amended modified or its terms waived except by writing signed by an Officer of Seller Service Policy Knowing that inoperative or defective instruments are as detrimental to TSI as they are to our customers our service policy is designed to give prompt attention to any problems If any malfunction is discovered please contact your nearest sales office or representative or call TSI s Customer Service Department at 800 874 2811 USA and 1 651 490 2811 International 150 9001 2000 For current information www tsi com iv CONTENTS CHAPTERS 1 Unpacking and Parts Identification 1 Optional Accessories nenn 2 Parts Identification en 3 2 Setting Up nase 5 Supplying Power to the TH CALC 5 Installing the Batteries
12. actory for service Use an alternate method to make measurement Plug in the RTD Allow sufficient time for the temperature to stabilize Read or record the average clear the sample register and proceed Return to TSI for replacement Chapter 5 Appendix A Specifications Specifications are subject to change without notice Specifications in parentheses indicate metric equivalents TEMPERATURE Range 32 to 140 F 0 to 60 C Accuracy 1 0 F 0 6 C Resolution 0 1 F 0 1 C SECONDARY TEMP PROBE optional Sensor Type RTD Range 40 to 248 F 40 to 120 C Accuracy 1 0 F 0 6 C Resolution 0 1 F 0 1 C RELATIVE HUMIDITY Sensor Type Thin film capacitive Range 5 to 95 RH Accuracy 3 0 RH Resolution 0 1 RH DEW POINT Range 5 to 120 F 15 to 49 C Resolution 0 1 F 0 1 C WET BULB Model 8722 Range 40 to 140 F 5 to 60 C Resolution 0 1 F 0 1 C 31 ABSOLUTE HUMIDITY Model 8722 only Range 0 0000151 to 0 00491 lbs moisture ft air 0 24 to 79 0 g moisture m air HUMIDITY RATIO Model 8722 Range 0 00014 to 0 187 Ibs moisture lb dry air 0 14 to 187 g moisture kg dry air OUTSIDE AIR Model 8722 Range 0 to 100 Resolution 0 1 INSTRUMENT TEMPERATURE RANGE Operating 41 to 158 F 5 to 70 C Storage 4 to 158 F 20 to 70 C LOGGING CAPABILITY Model 8722 Memory Up to 14 000
13. ast sample press and hold the NEXT TEST clear key and the display will begin a countdown from 5 to 0 Release the key at any time during the countdown before zero is displayed The display will flash CLEAR SAMPLE 22 Chapter 3 To clear al memory keep holding key during the countdown Release the key while 0 is displayed The display will beep twice and flash CLEAR LOG Note If you release the key after 0 is displayed it will not beep and nothing will be deleted Note Only the last sample recorded can be cleared without clearing the entire memory You cannot go back to a previous test ID and erase any of the values You cannot add data to a previous test ID Sample clear does not work in continuous data logging mode STATISTICS review data Key The STATISTICS review data key has two purposes One is to view the statistics for the currently displayed parameter and the other is to review data for a particular test ID including individual sample values To View Statistics Press STATISTICS review data key to view statistics for the parameter currently shown on the display The test ID number of samples and finally the average will be displayed Press STATISTICS review data again before the average disappears from the display to toggle through maximum and minimum To Review Data Press and hold STATISTICS review data key The TH CALC will beep twice Release the key Operation 23 and the test ID
14. ed according to temperature using the following equation OA Tr Ts Tr To x 100 where OA Percentage of outside air Tr Temperature of return air Ts Temperature of supply air To Temperature of outside air 16 Chapter 3 IMPORTANT Samples should be taken at the Air Handling Unit only since there may be components in the system that change the temperature that are not evident upon initial examination The general procedure is to take a sample in each of the four modes The modes are return air outside air supply air and OA Pressing sample while in 0A mode will store all four samples You may use the A and Y keys to move from mode to mode You may press the OA key at any time to exit back to normal sampling Details on the procedure are as follows Note You may press the OA at any time during the following sequence to exit the OA procedure without saving any data and to return to normal sampling Press the OA key once to put the instrument in return mode In return air mode RETURN will appear on the display The current temperature value will display on the bottom line of the display along with or the last value taken for return air on the top line Press SAMPLE once temperature has stabilized Now the sampled value will display on the top line If the sample is not acceptable or the temperature is not yet stable wait a minute and then take another sample to overwrite t
15. eis rn APPENDIXES A Specifications redia annann B DIP Switch Settings oooomcconsmmmmssmmm vi Chapter 1 Unpacking and Parts Identification Carefully unpack the instrument and accessories from the shipping container Check the individual parts against the list of components in Table 1 1 Ifany are missing or damaged notify TSI or your local distributor immediately Table 1 1 List of Components Be ee a Model 8720 TH CALC and 8720 Carrying Case 1319253 Model 8722 TH CALC and 8722 Carrying Case 1319114 4 AA Alkaline Batteries 1208013 Operation and Service Manual 1980397 Calibration Certificate 1083173 with Model 8722 only with Model 8722 only Optional Accessories The following contains information for optional accessories for the TH CALC Table 1 2 Optional Accessories Item Description Part 1 Optional AC Adapter 115 V NEMA 5 2613033 230 V European CEE 7 16 2613078 230 V Great Britain 800169 240 V Australian 2613106 1 Portable Printer 2 Chapter 1 Parts Identification Figure 1 2 TH CALc Temperature and Humidity Meter Keypad Display Printer Computer Interface Port Temperature and Humidity Probe Battery Access Cover NANA Unpacking and Parts Identification 3 Chapter 2 Setting Up Supplying Power to the TH CALc The TH CALC can be powered in one of two ways four size AA batteries or the optional AC adapter Installing the Batteries Inser
16. eld calibration adjustment available The temperature adjustment can add or subtract a number of degrees The range is 9 99 F 5 55 C Calibration can be done in either F or C mode Humidity adjustment adds or subtracts a constant percentage The range is 12 0 relative humidity The procedure for field adjustment is as follows Turn off the instrument flip DIP switch 7 to ON Turn the TH CALC on again On the Model 8720 press and hold the SAMPLE key to enter calibration mode The display will begin a countdown from 5 to 0 Release the key when 0 is displayed The top line of the display will show the adjustment number and the bottom line will show the actual reading value Use the A and Y keys to change the adjustment number and press SAMPLE key to accept Press the TEMP HUMIDITY key to make corrections on the other parameter When finished turn the instrument off and flip DIP switch 7 to off On the Model 8722 press and hold the TEMP or HUMIDITY key to enter the calibration mode for that parameter To enter the calibration mode for the RTD make sure the RTD is plugged in Press the TEMP key until rtd shows on the display then press and hold the TEMP key The display will begin a countdown from 5 to 0 Release the key when 0 is displayed The top line of the display will show the adjustment number factory setting is 0 0 and the bottom line will show the actual Setting Up 9 reading
17. gh the choices of 5 s 10 s 20s 30s 1m 2 m 5 m 10 m 15 m 20 m 30 m 60 m Press ENTER to accept the choice and return to measuring mode SAMPLE Key Setting Data Storage Options You can set parameters to be stored even ifthey are not displayed when a sample is taken In this section the terms On and OFF are referred to The following brief explanations may help to understand what function is being performed On means that the parameter will record whenever the SAMPLE key is pressed OFF means that the parameter will not be stored Press and hold the SAMPLE key to view enter or change data storage options Use A and Y key to toggle between On and OFF then press 20 Chapter 3 ENTER to accept the setting Continue this procedure for every parameter Discrete Data Logging Single Point Measurements Discrete data logging allows you to record single data points The instrument must first be in discrete data logging mode default See SAMPLE INTERVAL key section above Press the SAMPLE key to take a sample While the sample is being taken SAMPLE will flash on the display along with the sample number on each line for each parameter The sampling will last for 5 seconds Then the TH CALC will display the sample values that were recorded Continuous Data Logging Multiple Readings Over Time Continuous data logging allows you to record samples continuously To get into data loggi
18. he display along with the outside air value To put this OA value and the values from the three other modes into memory press the SAMPLE key Note Err will display if not enough information is available or a negative value is calculated To make changes to one of the other three readings without putting these values to memory yet press the A and Y keys to review the values and press SAMPLE to overwrite the value To exit this procedure completely without putting any values to memory press the OA key To take another outside air measurement make sure you pressed SAMPLE to put the values to memory Then use the A and V keys to review the measurements and take new samples for supply and return If you suspect the outside air temperature has changed you will have to retake that sample as well The process will be the same as outlined except that instead of displaying on the top line your previous sampled values will display Operation 19 SAMPLE INTERVAL Key Press and release the SAMPLE INTERVAL key to view the current mode of either discrete data logging dISC or continuous data logging COnt Use A and Y to toggle from one to the other and press ENTER to accept the choice If you chose dISC the instrument will return to normal operation If you chose continuous data logging LOG will display along with the logging interval choices Use the A and Y keys to scroll throu
19. he value on the top line Operation 17 Once the top line value is acceptable press the A key to advance to outside air In outside air mode OA will appear on the display along with the current temperature on the bottom line and or the last value taken for return air on the top line Once the reading has stabilized press SAMPLE The sampled value for outside air will display on the top line with the current reading on the bottom line If the sample is not acceptable or the temperature is not yet stable wait a minute and then take another sample to overwrite the value on the top line Once the value is acceptable press the A key to advance to supply air mode In supply mode SUPPLY will appear on the display along with the current temperature on the bottom line and or the last value taken for return air on the top line Once the supply air temperature has stabilized press SAMPLE The sampled value for outside air will display on the top line with the current reading on the bottom line If the sample is not acceptable or the temperature is not yet stable wait a minute and then take another sample to overwrite the value on the top line Once the value is acceptable press the A key to advance to OA 18 Chapter 3 Note At any time you may use the A and Y key to move between the 3 modes return outside and supply air to review or change the values OA will appear on t
20. ng mode and to select a logging interval see SAMPLE INTERVAL key section above Pressing the SAMPLE key once begins the sampling process The instrument will display LOG briefly indicating samples will be recorded After one logging interval has passed and whenever a sample is recorded the instrument will display SAMPLE briefly along with the log sample value The instrument continues taking samples until you press the SAMPLE key a second time One sample is taken every logging Operation 21 interval and each sample is an average over the entire sample interval The display will then scroll through the number of samples stored test ID number and sample average for that test ID To see maximum minimum or individual data points please see STATISTICS review data Key section NEXT TEST clear Key Press NEXT TEST clear to advance to the next test ID If the current test ID does not have anything stored it will not advance to the next test ID Note Upper case key functions are the primary key functions Lower case functions are press and hold functions The TH CALC will automatically increment the test ID number under the following conditions e turning off the TH CALC if there is stored data e taking a continuous data logging sample e taking discrete samples after taking continuous sample e taking a OA measurement after a normal sample e taking a normal sample after a OA measurement To clear the l
21. number will be displayed Use the A or A key to select the desired test ID Press ENTER to accept the test ID number Use A to view average maximum minimum total number of samples and individual sample numbers and values for the selected test ID The samples will be displayed in the order that they were taken To view a different test ID press STATISTICS review data again to return to test ID Use A or V key to choose a new test ID then press ENTER to accept the choice and continue as above to review the data To review data of a different measurement type press the desired measurement button while AVG MAX MIN number of samples or individual sample is being displayed For humidity ratio or absolute humidity press the HUMIDITY key to toggle through those parameters For the RTD press the TEMP key If there is no data for that measurement type will be displayed Press another measurement type key to view more data or press ENTER to return to measuring mode Note To view return air supply air or outside air individually you must download it to computer or print out the values OA is reviewable on screen Downloading Data to A Computer LOGDAT is a windows based program from TSI designed to download the data stored in the memory of Chapter 3 the TH CALC to a computer This data includes the test ID measurement unit of measure and logging interval This data is date and time stamped In addition
22. or random characters reset it by turning it off and then on again If necessary refer to the Portable Printer Manual Setting Up f Connecting to a Computer Use the Computer Interface Cable provided with the TH CALC Model 8722 to connect the instrument to a computer for remote polling or for downloading stored data Connect the 9 pin end labeled COMPUTER to the computer COM port and the other end to the data port of the TH CALC A 9 pin to 25 pin adapter will be required if your computer has a 25 pin serial port connector For more information on how to download stored data see Downloading Data to a Computer section in Chapter 3 For polling instructions see the following Data Acquisition Polling section Data Acquisition Polling The TH CALC is designed to allow the user to perform polling through the use of a computer To do this the user s computer must be connected and in terminal mode The baud rate for the computer and the TH CALC must be set to the same value For details on viewing or changing the baud rate see Changing the Baud Rate section in Chapter 2 You then must send an upper case V to the instrument Y ou must write your own routine program to obtain information at specific intervals from the TH CALC The meter will only send information when the SAMPLE key is pressed or after the computer has sent a V command to the TH CALC 8 Chapter 2 Field Calibration Temperature and humidity have a fi
23. samples and 1 000 test id s Intervals 5 sec 10 sec 15 sec 20 sec 30 sec 60 sec 2 min 5 min 10 min 15 min 20 min 30 min 60 min METER DIMENSIONS 3 9 in x 6 6 in x 1 5 in 100 mm x 168 mm x 38 mm METER PROBE DIMENSIONS Probe length 5 81 in 14 5 cm Probe diameter 0 75 in 1 9 cm METER WEIGHT Weight with batteries 1 16 lbs 0 53 kg 32 Appendix A METER DISPLA Y DIMENSIONS Display 2 line 4 digit LCD POWER REQUIREMENTS Four AA size batteries included or AC adapter optional PRINTER INTERFACE Type Serial Baud Rate 1200 For range of 23 to 203 F 5 to 95 C 2 At 77 F 25 C Add uncertainty of 0 03 F 0 05 C away from calibrated temperature Specifications 33 Appendix B DIP Switch Settings To access the DIP switches remove the batteries from the battery compartment On the inside of the battery compartment there is a wndow with eight DIP switches The table below shows the functions for each switch Caution Make certain that power is turned off before changing DIP switch settings DIP SWITCH Figure B 1 DIP Switch Location 35 Table B 1 DIP Switch Settings Switch OFF on 13 MustbeOFF u 4 Notassigned m 6 Buzzer OFF Normal Mode Calibrate Mode American Date European Date Format and Format and 12 345 67 12 345 67 The ON position is away from the batteries and OFF is towards the batteries
24. t four AA batteries as indicated by the diagram located on the inside of the battery compartment TSI ships the unit with alkaline batteries The TH CALC is designed to operate with alkaline batteries Other batteries are not recommended because of short life and the danger of battery acid leakage At 15 battery life remaining the battery light will indicate the batteries need to be changed Using the Optional AC Adapter The optional AC adapter allows you to power the TH CALC from a wall outlet When using the AC adapter the batteries 1f installed will be bypassed The AC adapter is not a battery charger Selecting the Display Units The TH CALC is capable of displaying the measured values in several different measurement units as shown in Table 2 1 Table 2 1 Choices of Measurement Units Temp DIP switch Humidity Ratio and Dew point setting 5 Absolute Humidity Wetbulb_ OFF lbs bandibs A _ F g kg and g m If you wish to change the display units on your TH CALC see Appendix B for DIP Switch location and settings Baud Rate The TH CALC Model 8720 has a set baud rate of 1200 which allows it to communicate with the optional portable printer The Model 8722 has a variable baud rate that is used when downloading or printing data from the instrument By increasing the baud rate the data will download faster The instrument baud rate is displayed during the initial power up sequence To change the
25. the statistics for each test ID are provided The file containing the downloaded data is sorted and tab delimited to allow it to be imported into a spreadsheet for further data analysis To install LogDat software run the SETUP EXE file on the LogDat distribution disc Once you open the program it is self directing and provides all the necessary instructions for downloading data To download data from the TH CALC connect the supplied computer interface cable to the TH CALC and to a computer serial port Any serial port from COMI to COM4 can be used Operation 25 Chapter 4 Maintenance Probe Tip Periodically inspect the probe tip to ensure that it is clean Dust and oil deposits on the sensor may affect the response time of the TH CALC To remove dust blow it off with a gentle stream of air Recalibration To maintain a high degree of accuracy in your measurements TSI recommends that you return your instrument for annual recalibration For a nominal fee we will recalibrate the unit and return it to you with a NIST US National Institute of Standards and Technology traceable certificate This annual checkup assures you of consistently accurate readings it is especially important in applications where strict calibration records must be maintained Cases If the instrument case or storage case needs cleaning wipe it off with a soft cloth and a mild detergent Never submerge the TH CALC Storage When storing the
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