Digital Thermometers Instruction Manual MODELS 868 and
Contents
1. 0 00385 4 WIRE TEMPERATURE ACCURACY RANGE SPAN RESOLUTION 65 to 82 F 1 Year 200 F 100 0 to 199 9 0 1 0 4 F 199 9 to 100 1 0 1 1 0 F 1100 F 100 to 1100 1 2 F 360 to 101 1 4 F ACCURACY Includes DIN 43 760 ITS 90 conformity repeatability temperature coefficient 65 to 82 F time stability 1 year and errors with up to 50 ohms of lead resistance each lead Excludes probe errors however probe errors around 32 F may be compensated by an internal adjustment REPEAT ABILITY 0 2 F typical for 1 week at constant ambient temperature TEMPERATURE COEFFICIENT 65 to 82 F included in accuracy specification From 14 to 65 and 82 to 122 F less than 0 015 F F MAXIMUM LEAD RESISTANCE each lead 4 Wire 50 ohms 3 Wire 10 ohms SENSOR CURRENT 500uA maximum MODEL 869 SPECIFICATIONS TEMPERATURE SENSOR TYPE 3 wire or 4 wire 100 Ohm Platinum RTD alpha 0 00385 4 WIRE TEMPERATURE ACCURACY RANGE SPAN RESOLUTION 18 to 28 C 1 Year 200 C 100 0 to 199 9 0 1 0 3 C 199 9 to 100 1 0 1 1 5 C 630 C 100 to 630 1 1 C 220 to 101 1 2 C ACCURACY Includes DIN 43 760 ITS 90 conformity repeatabilitiy temperature coefficient 18 to 28 C time stability 1 year and errors with up to 50 ohms of lead resistance each lead Excludes probe errors however probe errors around 0 C may be compensated by an internal adjustment REPEATABILITY 0 1 C2. The reading is in F Model 868 or C Model 869 A leading minus sign indicates a negative temperature reading An over range a 1 followed by blanked digits may indicate the need to switch to a higher range or show that the temperature is outside the measuring range of the instrument or that the probe is open 6 When the measurement is complete place the on off range switch in the OFF posi tion to conserve the battery ACCURACY CONSI DERATI ON Model 868 basic accuracy is specified as on page 1 Similarily Model 869 basic accuracy is also specified on page 1 Keep in mind that these accuracy figures are for 4 wire probe operation with a lead resistance of less than 50Q each lead Thus 4 wire probes should be used whenever possible to maintain the highest accuracy Accurate readings can also be made with the instrument in the 3 wire mode with a suit able 3 wire probe For best accuracy however lead resistance should be no more than 100 per lead Also readings made in the 3 wire mode are sensitive to variations caused by changes in lead resistance as well as to differences in lead resistance For example a difference of only 38mQ 0 03890 in lead resistance will cause a change of 0 1 C around O C Four wire readings are not affected by these lead resistance variations Accuracy figures do not include possible probe errors which could affect overall mea surement accuracy Probe errors near 32 F for the Model 868 and n
3. center is located The customer shall be responsible for paying all shipping duties taxes and additional costs if the product is transported to any other locations Repaired products are warranted for the remaining balance of the original warranty or 90 days whichever period is longer Warranty Limitations The TEGAM Inc warranty does not apply to defects resulting from unauthorized modification or misuse of the product or any part This warranty does not apply to fuses batteries or damage to the instrument caused by battery leakage The foregoing warranty of TEGAM is in lieu of all other warranties expressed or implied TEGAM specifically disclaims any implied warranties of merchantability or fitness for a particular purpose In no event will TEGAM be liable for special or consequential damages Purchaser s sole and exclusive remedy in the event any item fails to comply with the foregoing express warranty of TEGAM shall be to return the item to TEGAM shipping charges prepaid and at the option of TEGAM obtain a replacement item or a refund of the purchase price Statement of Calibration This instrument has been inspected and tested in accordance with specifications published by TEGAM Inc The accuracy and calibration of this instrument are traceable to the National Institute of Standards and Technology through equipment which is calibrated at planned intervals by comparison to certified standards maintained in the Laboratories of TEGAM I
4. the instrument Make sure the two case halves line up properly now secure the rear cover with the screws that were removed earlier TEAM EENENSSSSSSSSSSSSSNNNNNNNNNNNNE OPERATION Figure 1 shows the general control layout including display nomenclature for your digital thermometer The following paragraphs contain information on probe connection 3 and 4 wire selection range selection and basic temperature measuring procedures Probe Input Connector Low Battery I ndicator Shows when less than 10 of battery Minus Sign Indicates Negative Temperature 1999 Count Display Over range indicated by 1 followed by blanked digits ON OFF Range Switch IOO ELANNON RID ENKE 360 F to 1100 F AE Model 868 Model 869 Figure 1 Control and Display Nomenclature Connect a temperature probe to the input connector on the top of the instrument Use one of the probes described in the accessories section or install a 4 wire connector on any 100 ohm platinum RTD probe using the information in Figure 2 2 Make sure the instrument is set for 3 wire or 4 wire operation according to probe type in use The unit is set for 4 wire operation at the factory but the mode of operation may be changed as follows A Remove the rear cover as described in the Battery Installation Replacement section of this manual B Place the 3 wire 4 wire jumper see Figure 3 in the desired position 6 TEGAM C Re install th
5. the probe tip rests at the center of the ice water bath 4 Allow 20 minutes for the test fixture temperature to stabilize With the Model 868 on the 200 F range adjust R104 for a reading of 32 0 on the display For the Model 869 R104 should be adjusted for a reading of 00 0 with the instrument on the 200 C range NOTE Using this method of probe calibration will uncalibrate the instrument slightly when used with other probes 14 Pca Warranty TEGAM Inc warrants this product to be free from defects in material and workmanship for a period of one year from the date of shipment During this warranty period if a product proves to be defective TEGAM Inc at its option will either repair the defective product without charge for parts and labor or exchange any product that proves to be defective TEGAM Inc warrants the calibration of this product for a period of one year from date of shipment During this period TEGAM Inc will recalibrate any product which does not conform to the published accuracy specifications In order to exercise this warranty TEGAM Inc must be notified of the defective product before the expiration of the warranty period The customer shall be responsible for packaging and shipping the product to the designated TEGAM service center with shipping charges prepaid TEGAM Inc shall pay for the return of the product to the customer if the shipment is to a location within the country in which the TEGAM service
6. typical for 1 week at constant ambient temperature TEMPERATURE COEFFICIENT 18 to 28 C included in accuracy specification From 10 to 18 and 28 to 50 C less than 0 015 C C MAXI MUM LEAD RESI STANCE each lead 4 Wire 50 ohms 3 Wire 10 ohms SENSOR CURRENT 500A maximum MODEL 868 and 869 GENERAL SPECIFI CATI ONS unless specified DISPLAY 3 1 2 digit LCD 13mm 0 5 height Polarity and decimal point indication CONVERSION RATE 1 5 readings per second OVERRANGE AND OPEN SENSOR INDICATION 3 least significant digits blanked 1 Pca MAXI MUM COMMON MODE VOLTAGE 30VDC 42V peak AC COMMON MODE REJ ECTI ON Less than 0 001 volt at DC 50 Hz and 60 Hz 1000 unblance LO driven ENVIRONMENTAL LI MITS FOR OPERATI NG 10 to 50 C 14 to 122 F less than 80 relative humidity up to 35 C 95 F Reduce R H Limit by 3 from 35 to 50 C 1 7 R H F from 95 to 122 F ENVIRONMENTAL LI MITS FOR STORAGE 35 to 60 C 30 to 140 F less than 90 relative humidity up to 35 C 95 F Reduce R H Limit by 3 C from 35 to 60 C 1 7 R H F from 95 to 140 F INPUT CONNECTION 4 pin miniature instrumentation connector POWER 9V alkaline or carbon zinc battery BATTERY LIFE CONTINUOUS 500 hours typical with alkaline battery 300 hours typical with carbon zinc battery BATTERY INDICATOR Display indicates LO BAT when less than 10 of life remains DI MENSIONS WEIGHT 160mm lo
7. Digital Thermometers Instruction Manual MODELS 868 and 869 Instruction Manual PN 869 901 01CD Publication Date March 2011 REV F NOTE This User s Manual was as current as possible when this product was manufactured However products are constantly being updated and improved To ensure you have the latest documentation refer to www tegam com A M1 0000000 SPECIFICATIONS wii sscnessesscte 1 GENERALINFORMATION cn 3 MANUAL ADDENDA eC 3 OPTIONAL ACCESSORIES 2 osicceiitss coat 3 dud Wngdediopndyi c c 4 BATTERY INSTALLATION REPLACEM ENT sse ener inneren rnit neni nr ennt neni nr nnns tn nene seiner tener treten nens nnne 5 OPERATION m HR 6 SAFETY ad Telscr pug 9 Misuisie surenideredolgi 10 CALIBRATION oorr teo Eon UE dunientatedees inmitten sts ead edet t ceu ete eed 12 GENERAL INSTRUMENT CALIBRATION sees enne nnnn nnns inttr en tese inns sans sn NEEE AKA AEAEE E TEREE EO ENN EeNNN 13 lues 15 Warranty NTon e Terr 15 Statement of Calibration erarnan an aeaa raO E EA E ET EEEE EEE EK E EEEE EEEa 15 TEAM EENENSSSSSSSSSSSSSSSSSNNNNNNNNNNN SPEC IHC ATIONS MODEL 868 SPECIFICATIONS TEMPERATURE SENSOR TYPE 3 wire or 4 wire 100 Ohm Platinum RTD alpha
8. Potentiometer locations are shown in Figure 5 6 If probe compensation is required proceed to the next paragraph otherwise dismantle the test fixture set the 3 WIRE 4 WIRE jumper to the correct position and replace the back cover Table 2 Calibration Procedure MODEL 868 Step Adjustment Potentiometer Range Calibration Resistor Value Desired Reading 1 R104 200 F 93 03 Q 00 00 2 R105 200 F 134 92 Q 195 0 3 R103 1100 F 311 560 1100 MODEL 869 Step Adjustment Potentiometer Range Calibration Resistor Value Desired Reading 1 R104 200 C 100 00 Q 00 00 2 R105 200 C 174 01 Q 195 0 3 R103 630 C 313 710 600 PROBE COMPENSATION CALIBRATION 13 Fca The procedure outlined in the last paragraph provides accurate absolute instrument calibration but it cannot compensate for probe inaccuracy Probe errors near 0 C 32 F can be minimized by using the following procedure 1 Make up an ice water bath by firmly pacing a Dewar flask or thermos with pea size ice cubes made of distilled water and then filling the container with distilled water Replace melted ice with new ice while removing excess water during the calibration procedure 2 Connect the probe to be compensated to the instrument 3 Drill a hole in the flask or thermos cap just large enough to accommodate the probe Place the cap on the bath container and pass the probe through the hole until
9. e rear cover and tighten the retaining screws REAR VIEW REAR VIEW A 4 TERMINAL es PROBE B 3 we PROBE Figure 2 100 Ohm Platinum RTD Connections Pin 1 Source Pin 2 Sense Pin 3 Source Pin 4 Sense NOTE Use only 100Q platinum RTD sensors that conform to the DIN 43 760 standard alpha 0 00385 Other type sensors will give inaccurate results Maximum allowable lead resistance for rated accuracy is 500 per lead 4 wire or 10Q per lead 3 wire 3 WIRE 4 WIRE JUMPER Figure 3 3 Wire 4 Wire Jumper Location NOTE For best accuracy it is recommended that the instrument be used in the 4 wire configuration with a suitable 4 wire probe If 3 wire probes are used with the instrument in the 4 wire mode noisy readings will result the displayed reading will jump around Unlike 4 wire 3 wire reading accuracy is affected by changes in lead resistance and unbalanced lead wire resistance SWITCH COVER siti srirt t _ e a e gt 3 WIRE om Pca 3 Place the temperature range switch in the desired position Use the lower range when possible for best resolution and accuracy Power is automatically turned on when the range is selected 4 Place the probe tip on or in the material to be measured WARNI NG Do not subject the probe to a voltage more than 30V RMS 42V peak above earth ground or a shock hazard may result 5 Take the reading from the display
10. ear O C for the Model 869 can be minimized by recalibrating the instrument for use with a specific probe For probe calibration procedures refer to the calibration section of this manual Pca The operating temperature of the instrument itself can affect accuracy The accuracy figures given above are for an instrument operating in the range of 18 C to 28 C 65 F to 82 F For operating environments between 10 C and 18 C 14 F and 65 F and between 28 C and 50 C 82 F and 122 F a temperature coefficient of less than 0 015 C C 0 015 F F can be expected SAFETY SYMBOLS AND TERMS The baa on the instrument denotes that the user should refer to the operating instructions The WARNING used in this manual explains dangers that should result in personal injury or death The CAUTION used in this manual explains hazards that could damage the instrument WARNI NG A shock hazard exists on the Instrument s input terminals when probes or sensors are exposed to voltage levels greater than 30V rms or 42V peak Pca WARNI NG The information in this section is intended only for qualified service personnel Before removing the back cover to service the instrument disconnect the temperature probe VERIACATION PROCEDURE Performance verification is performed by connecting known precise resistors to the instrument in place of a temperature probe and checking to see that the displayed reading falls within a prescribed ra
11. ic 4 Long Battery Life Because of low power consumption an alkaline battery will typical ly last for 500 hours of continous operation MANUAL ADDENDA Information presented in this manual was believed to be accurate at the time of printing Any changes in the instrument which occur after this manual is printed will be covered separately in an addendum packed with the instrument Be sure to note these changes before attempting to operate or service the instrument OPTIONAL ACCESSORIES Available accessories including recommended temperature probes are listed below Contact any TEGAM Distributor or the factory for information on purchasing accessor ies A M1 Model 8660 Tilt Stand Belt Clip provides a convenient method of elevating the instru ment to a convenient viewing height The Model 8660 also includes a belt clip Model 8668 Soft Carrying Case provides protection for the Model 868 or 869 during transportation or storage Model 8693 General Purpose Immersion Probe is a 4 wire 1000 platinum RTD probe designed for immersion in liquids as well as other general purpose applications The Model 8693 has a basic tolerance of 0 3 C at 0 C The measurement range of the Model 8693 is 220 C to 630 C Model 8695A Surface Probe is a 4 wire 1000 platinum RTD probe designed to measure flat surfaces of solids in the range of 50 C to 260 C The Model 8695A has a basic tolerance of 0 3 C at 0 C Model 8696 Air Gas Probe
12. is a 4 wire 10012 platinum RTD probe with an exposed sensor with an exposed sensor within a protective shroud to measure ambient tempera ture The Model 8696 measures between 50 C and 260 C The basic tolerance of the Model 8696 is 0 3 C at O C PREPARATION FOR USE Carefully unpack the instrument from its shipping carton and inspect for any obvious signs of physical damage Report any damage to the shipping agent at once The fol lowing items are included with every shipment 1 Digital Thermometer 2 CD of Manual 3 9V battery 4 4 wire miniature instrumentation connector mates with probe connector on the in strument NOTE As shipped the instrument is configured for 4 wire probes See the operation section for selection of 3 wire operation Pca BATTERY INSTALLATION REPLAC EMENT A 9V battery is supplied with the unit To install or replace the battery proceed as follows WARNING Turn off the power and disconnect the temperature probe before removing the back cover to install or replace the battery Replace the back cover before resuming use of the instrument 1 Place the unit face down on a cloth covered flat surface 2 Remove the screws in the back cover now remove the back cover by carefully separating the two halves at the top of the instrument 3 Place the 9V battery in the battery compartment as indicated in Figure 3 on page 7 Be sure to observe proper polarity 4 Re install the rear cover on
13. nc 15 Pca TEGAM is a manufacturer of electronic test and measurement equipment for metrology calibration and production test We also provide repair calibration and other support services for a wide variety of test and measurement equipment including RF power sensor calibration systems RF attenuation measurement systems resistance standards ratio transformers arbitrary waveform generators micro ohmmeters LCR meters handheld temperature calibrators thermometers humidity and temperature control devices and more TEGAM also repairs and calibrates test and measurement equipment formerly manufactured by Electro Scientific ESI Gertsch Keithley Instruments Lucas Weinschel and Pragmatic Instruments A complete list can be viewed on our Product Service Directory at www tegam com For more information about TEGAM and our products please visit our website at www tegam com or contact one of our customer service representatives at sales tegam com or 800 666 1010 Contact Information TEGAM INC 10 TEGAM WAY GENEVA OHIO 44041 WEB http www tegam com 16
14. ng x 69mm wide x 31mm thick 6 3 x 2 7 x 1 2 Net weight 210gm 7 5 oz CONSTRUCTION Heavy duty ABS plastic housing ACCESSORIES SUPPLIED Battery instruction manual and mating input connector Specifications subject to change without notice Pca G ENERAL INFORMATION The TEGAM Models 868 and 869 are handheld digital thermometers designed to use 1000 platinum RTD temperature sensors for high accuracy and long term temperature stability The Model 868 has two switch selectable ranges from 199 9 F to 199 9 F with 0 1 F resolution and between 360 F and 1100 with 1 F resolution The Model 869 measures between 199 9 C and 199 9 C with 0 1 C resolution or between 220 C and 630 C with 1 C resolution or between 220 C and 630 C with 1 C reso lution Both instruments are designed for use with probes conforming to the DIN 43 760 standard Model 868 and 869 features include 1 Platinum RTD Based Temperature Measurements A chief advantage of the platinum RTD resistance temperature detector sensor used by the unit is platinum s pre dictable resistance change with temperature resulting in high accuracy 2 Easily selected 3 or 4 Wire Measurements The unit may be used with either 3 wire or 4 wire temperature probes An internal jumper provides a means of easy 3 or 4 wire selection the unit is set for 4 wire operation at the factory 3 Rugged Case The instrument s case is made of high impact ABS plast
15. nge The following procedure should be per formed at an ambient temperature between 18 C and 28 C 65 F and 82 F at a relative humidity of less than 80 If the instrument has been stored outside these limits allow at least 24 hours for operating conditions to stabilize Required Equipment Precision decade resistance 0 01 tolerance Gen Rad Model 1433T or equivalent Female 4 wire instrumentation connector supplied with instrument NOTE The following procedure must be performed with the instrument in the 4 wire mode See Figure 3 for the location of the 3 wire 4 wire jumper which sets the appropriate mode Access to the jumper requires rear cover removal as described in the disassembly instructions Procedure 1 Connect the precision resistance box to the instrumentation connector as shown in Figure 4 Plug the connector into the instrument 2 Turn on the instrument and verify that the LO BAT indicator is not displayed if it is replace the battery before beginning the verification procedure 10 REAR VIEW DECADE RESISTANCE BOX Figure 4 Connections for Performance Verification and Calibration 3 Refer to Table 1 which lists the verification procedure for both in struments covered by this manual To verify instrument perfor mance at each of the points set the resistance box to the required value with the instrument on the prescribed range verify that the displayed reading falls within the neces
16. sary limits 4 If the displayed reading is out of tolerance at any of the points refer to the calibration section for the correct procedure to bring the in strument within tolerance NOTE If the instrument is still under warranty less than 12 months since the date of shipment and it does not meet specifications after calibration contact your TEGAM Dis tributor or the factory to determine the correct course of action Table 1 Performance Verification Procedure Model 868 Allowable Reading Range Resistance Value 65 F to 82 F 1100 F 10 810 364 to 356 200 F 71 00 Q 100 4 to 99 6 200 F 93 03 Q 0 4 to 0 4 200 F 114 68 Q 99 6 to 100 4 200 F 134 92 Q 194 6 to 195 4 1100 F 311 56 Q 1098 to 1102 11 000000000 Table 1 Performance Verification Procedure Cont Model 869 Range Resistance Value Allowable Reading 65 F to 82 F 630 C 9 900 222 to 218 200 C 60 26 Q 100 3 to 99 7 200 C 100 00 Q 0 3 to 0 3 200 C 138 510 99 7 to 100 3 200 C 174 01 Q 194 7 to 195 3 630 C 313 710 599 to 601 CALIBRATION Calibration should be performed yearly or whenever the instrument is known to be out of specification Calibration should be done at an ambient temperature of 23x1 C at a relative humidity of less than 80 Normal instrument calibration is performed by substituting precision resistors of known value for the tempera
17. ture probe and adjusting calibration potentiometers for specified readings on the display The instrument may also be calibrated to compensate for probe errors near 0 C 32 F Both procedures are covered in this section Calibration Equipment Gen Rad precision decade resistor box 0 01 tolerance Model 1433T or equivalent Female 4 wire instrumentation connector supplied with instrument The following items are necessary only for probe compensation Distrilled ice water bath in Dewar flask or thermos Platinum RTD immersion probe Model 8693 or equivalent CALIBRATION ADJ USTMENTS ADJUSTMENT ORDER 1 R104 2 R105 3 R103 12 Pca GENERAL INSTRUMENT CALIBRATION 1 Connect the precision decade resistor box to the instrument as shown in Figure 4 2 Remove the rear cover as described in the battery installation replacement section of this manual Note that it is not necessary to remove the PC board to perform calibration 3 Check to see that the 3 wire 4 wire jumper is in the 4 wire position 4 Turn on the instrument power and verify that the LO BAT indicator is not displayed If it is replace the battery before beginning the calibration procedure 5 Refer to Table 2 Calibration procedures are outlined there Perform each step in the procedure in the order shown by setting the decade box to the precise value listed and then adjusting the associated calbra tion potentiometer for the required reading on the display
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