Fluke Thermometer 80t-150u User's Manual
Contents
1. plugs 4 Grasp one case half in each hand Pull the two halves apart beginning at the end with the banana plugs 5 Remove and replace the battery 6 Reassembie the 80T 150U as follows Mate the two case halves at the end where the cable enters the case then hinge the two halves together Replace the case screw being careful not to pinch the probe cable or battery wires PERFORMANCE TEST Complete the calibration procedure without opening the temperature to voltage converter assembly and without making any calibration adjustments Observe the readings given in brackets Other readings are for calibration only Mercury Thermometer Dewar Flask and Cap Metal or Glass Container Digital Voltmeter Resolution Resolution For application or operation assistance or information on Fluke products call Test Equipment Requirements MINIMUM USE SPECIFICATIONS 0 1 C Resolution 4 Pint Capacity for Ice Bath _ 1 Pint Capacity 100 mV Range with 10 uV 4000 mV Range with 100 nV 800 426 0361 in most of U S A 206 356 5400 from AK Hi and WA 206 356 5500 from other countries CALIBRATION A calibration cycle of one year is recommended to maintain the unit within the specifications given earlier The equipment required for calibration is listed in the table following the calibration procedure NOTE Values given in brackets apply to the Performance Test Perform the fol2. INTRODUCTION The Model 80T 150U Universal Temperature Probe is a self contained temperature to voltageconverter The probe is designed to provide a direct temperature reading when it is connected to any high impedance DMM thatis capable of 1 mV resolution and atleast a 300 count full scaie readout capability Output is mV per degree Celsius or Fahrenheit Two swiich selected temperature output scalings are provided 50 to 150 C or 58 to 302 F The probe will stand off 350V de or peak ac The unit is housed in two separate but attached assemblies a temperature probe and a temperature to voltage converter The probe contains the temperature sensing element and is electrically connected to the temperature to voitage converter through a 46 inch shielded cabie A three position switch on the converter acts as a power switch and is used for selecting Ceisius or Fahrenheit scaling for the output Two banana plugs with standard 0 75 inch spacing are provided for connecting the 80T 150U to the DMM Operating power for the 80T 150U is derived from a standard 9V battery Typically an alkaline battery provides more than 1600 hours of continuous operation before replacement is necessary An OFF switch is provided on the temperature to voltage converter to allow battery conservation when the unitis notin use In addition the OFF position of the power switch ailows the battery condition to be determined via the external DMM Temperature is
3. RES MF 150K 1 AW RES MF 34 8K 1 sW RES MF 6 65K 1 W RES CF 02 44W iC OP AMP BIPOLAR SWITCH SLIDE SP3T CONNECTOR BATTERY PLUG BANANA SCREW PHPO 4 40X Ys SENSING PROBE AND CABLE ASSY 80T 150 7001K CABLE TIE CASE BOTTOM BATTERY NEDA 1604 9V SCREW PHP 4 40X3 16 CASE TOP COVER SW WARRANTY ONE YEAR LIMITED WARRANTY John Fluke Mig Co Fluke warrants your accessory to be free from defects in material and workmanship under normal use and service for 1 year from the date of purchase if you are the original purchaser The warranty does not _ apply to batteries or fuses or when the accessory has been misused altered or damaged by accident or abnormal conditions of operation For warranty service send the accessory with a description of the difficulty postage prepaid to a Fluke Service Center Fluke assumes no risk for damage in transit Fluke will at our option repair or repiace the defective instrument free of charge However if we determine that the failure was caused by misuse alteration accident or an abnormal condition of operation you will be billed for the repair The repaired accessory will be returned transportation prepaid FLUKE MAKES NO WARRANTY OTHER THAN THE LIMITED WARRANTY STATED ABOVE ALL WARRANTIES INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE ARE LIMITED TO A PERIOD OF 1 YEAR FROM THE DATE OF PURCHASE FLUKE SHALL NOT BE LIABLE FOR
4. 0 to 70 35 C to 50 C noncondensing Altitude Operating lt 10 000 feet Storage lt 50 000 feet Application Force 20 pounds maximum probe tip to measured surface GENERAL Weight 5 7 ounces 161 5 grams Overall Length 53 8 inches 1 36 meters Battery Standard 9V battery NEDA 1604 6F22 006P Battery Life 1600 hours typical Alkaline Battery 6 5V minimum Output Termination Standard 0 75 inch spaced double banana plug OPERATING NOTES The following paragraphs are intended to familiarize the operator with the 8OT 150U The operator shouid read these paragraphs before atiempting to operate the probe Probe Limitations The 80T 150U probe is constructed ofa highly durable plastic and is suitable for measuring the temperature of liquids gases and solid surfaces up to 150 C When measuring temperature observe the following precautions to prevent damage to the probe 7 Do not expose the probe end probe tip plus about 2 inches of the probe body to temperatures exceeding 450 C 302 F The remainder of the probe body should not be exposed to temperatures above 70 C 160 F 2 For liquid measurements recommended applications range from water lubricants and fuels to most solvents Liquids as shallow as inch can be measured since the temperature sensor is in the probe tip WARNING TO AVOID ELECTRICAL SHOCK DO NOT USE THIS INSTRUMENT WHEN VOLTAGES EXCEEDING 350V DC OR PEAK AC ARE PRESENT T
5. ANY SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES WHETHER IN CONTRACT TORT OR OTHERWISE l l NOTE USA only Some states do not allow limitation of implied warranties or the exclusion of incidental or consequential damages so the above limitations or exclusions may not apply to you This warraniy gives you specific legal sights and you may have other rights which vary from state to state
6. measured by exposing the probe tip directly to the material to be measured non corrosive liquid gas or solid A direct temperature reading is displayed on the DMM SPECIFICATIONS The 80T 150U will achieve rated accuracy when it is used with any 0 25 DMM that has an input impedance of gt 1 MQ ELECTRICAL Measurement Range 50 to 150 degrees Celsius 58 to 302 degrees Fahrenheit Accuracy AMBIENT C ACCURACY 15 to 35 C 1 C from 0 to 100 C decreasing linearly to 3 C at 50 and 150 C 42 C from 0 to 100 C decreasing linearly to 4 C at 50 and 150 C Oto 15 C and 35 to 50 O AMBIENT F ACCURACY 59 to 95 F o 1 8 F from 32 to 212 F decreasing linearly to 5 4 F at 58 and 302 F 32 to 59 F and 3 6 F from 32 to 212 F decreasing linearly 95 to 122 F to 7 2 F at 58 and 302 F Sensitivity 0T 150U output 1 mV de C or F P N 778134 FEBRUARY 1986 1986 John Fluke Mfg Co Inc All Rights Reserved Litho in U S A nstruction Sheet 80T 150U Universal Temperature Probe Voitage Standoff 350V dc or peak ac Settling Time 5 5 seconds to settle within 2 for a 50 change ENVIRONMENTAL l Ambient Operating Range for Unit 0 to 50 C 32 to 122 F Maximum Temperature Probe Body and Cable 70 C 160 F See Probe Limitations Storage Temperature for Unit 40 fo 70 C 40 to 160 F Humidity 0 to 90 0 C to 35 C noncondensing
7. 1 P2 and the reference side of the bridge P1 Since AR1 is operating as an inverting amplifier its outputis used as the low input to the voltmeter This enabies the voltmeter to display an increase in temperature as an increase in voltage GENERAL MAINTENANCE Access information The battery and the calibration pots are tocated on the interior of the temperature to voitage converter assembly Access to these loca tions is accomplished by removing the screw from the bottom side of the assembly and removing the top of the plastic case Battery Condition Test 1 Set the power switch to the OFF position 2 Connect the 80T 150U to the DMM 3 Setthe DMM to the 200 or 300 mV de range 4 Read the battery test voltage on the DMM A minimum reading of 100 mV is acceptable and indicates that approximately 100 hours of battery life remain sen ERENUNEER SNURSNENNA ENN MSEENER Feriti iite LL ERL 2M 5M 10 MHz 20 MHz MHz Figure 2 Maximum Signal RF Limits Vrms at Probe Tip Figure 3 Simplified Circuit Diagram Battery Replacement WARNING TO AVOID ELECTRICAL SHOCK REMOVE THE PROBE FROM THE MEASUREMENT SURFACE BEFORE OPENING THE CASE TOTALLY REASSEMBLE THE INSTRUMENT BEFORE ATTEMPTING TO USE IT 1 Set the power switch to the OFF position 2 Disconnect the 80T 150U from the DMM 3 Turn the 80T 150U so the power switch is facing down Remove the single screw located between the banana
8. HE PROBE TIP IS ELECTRICALLY CONNECTED TO THE OUTPUT TERMINALS CAUTION Long term exposure of the probe to corrosive environ ments will result in pitting and deterioration of the aluminum probe tip Error Sources When the probe tip is applied to a solid surface it draws or sinks heat from the surface Therefore if the measured surface has a low mass e g a transistor case the indicated temperature may be jower than the actual temperature Similarly a steady state error Or gradient exists between the measured sufface and the sensing device in the probe tip This is due to the flow of heat from the measurement surtace to the probe body The effect of the steady state error increases as the differential between ambient and surface temperature increases To determine the actual surface temperature of a device both the heat sinking and steady state errors must be considered The correction curve given in Figure 1 approximates the effect of both error sources on TO 3 TO 5 and TO 18 transistor cases RF signals applied to the 80T 150U probe tip can also Cause errors in temperature measurement Figure 2 defines the rf signal iimits that can be tolerated without degrading measurement accuracy OPERATION Use the following procedure to operate the 80T 150U probe 4 Connectthe banana plugs on the 80T 150U to the input terminals of a high impedance DMM Observe polarity 2 Select ade voltage range that will provide at least 1 mV
9. be kit 80T 150 7001K PN 431023 is available for replacing damaged or defective probes The kit includes a probe and cable assembly and an installation and calibration instruction sheet LIST OF REPLACEABLE PARTS A Schematic of the 80T 150U is shown in Figure 4 A list of replaceable parts is shown in Figure 5 When ordering parts provide the description Fluke part number and the quantity required RECOMMENDED MODEL Princo Model SAMA CP45 Thermos Bottle Suitable for Boiling Water Fluke Model 8840A John Fluke Mfg Co Inc P O Box C9090 Everett WA 98206 BLACK RED 80T 150U 1201 Figure 4 80T 150U Temperature Probe Schematic Figure 5 List of Replaceable Parts i REFERENCE DESIGNATOR R5 10 13 R amp R7 R8 RQ Rit R12 Ri4 R15 R17 R18 W2 ARI S1 744512 729202 697284 733642 721829 768950 720870 772566 658922 772525 772574 772582 772038 772020 757807 772533 772558 772349 772541 682575 418913 772301 738179 736033 747501 431023 172080 778050 696534 129882 769034 735860 DIODE CURRENT REG 1C 1 23V 150 PPM T C BANDGAP REF CAP CER 01 UF 50V RES VAR CERM 500 OHMS 3W RES VAR CERM 100K 3W RES VAAR CERM 50K 3W RES CF 10M 5 AW RES CF 2 4M 5 uw RES MF 8 87K 1 YW RES MF 4 42K 196 40W RES MF 30 1K 1 aW RES MF 34 8K 1 W RES MF 15 4K 1 aW RES MF 464K 1 W RES MF 100K 1 W RES MF 196K 1 WwW
10. lowing steps to calibrate the 80T 150U 1 Access the interior of the temperature to voitage converter by removing the bottom case screw and separating the case halves 2 Connect the 80T 150U to a DVM with 10 yV resolution and select mV dc range 3 Select the C position of the switch Immerse the probe tip 2 inches into a mercury thermometer monitored 0 C bath and allow 60 seconds for the readings to stabilize 4 Adjust R3 see Figure 4 to obtain the following reading 0 00 0 05 mV dc 0 2 mV dc 5 Select the F position of the switch and adjust R2 to obtain the following reading 32 0 0 4 mV de 32 0 4 mV de 6 Selectthe C position and move the probe tip to a70 C to 90 C bath and again allow the readings to stabilize 7 Adjust R4 to obtain a DVM reading that agrees with the bath temperature BT as monitored by a mercury thermometer C BT 0 05 mV de BT 2 mV dc 8 Select the F position and verify that the output is within 4 mV dc of the bath thermometer reading ifnecessary change the DVM range to obtain an on scale reading 9 Return the probe tip to the 0 C bath and check the output If readjustment is necessary repeat steps 4 through 8 until readings can be obtained without adjustment 40 Set the 80T 150U switch to the OFF position and remove the 80T 150U from the DVM 41 Reassemble the 80T 150U 42 The 80T 150U is now calibrated PROBE REPLACEMENT od A pro
11. resolution 1 mV degree and a full scale readout that will encompass the expected temperature The 2V range of a 3 digit DMM is adequate ignore readings of less than 1 when a more sensitive DMM is used 3 Set the 80T 150U power switch to C or F and energize the DMM 4 Firmly touch the probe tip to the surface to be measured or expose it to a liquid or gas The DMM wiil display the temperature in degrees Vary the probe angle and pressure when measuring solid surface temperatures The highest stabilized reading wili be the most accurate See the following measuring technique CAUTION The force exerted on the probe tip should not exceed 20 pounds MEASURING TECHNIQUE Here are some suggestions for improving the accuracy of your temperature measurements om 150 HHH j Bes EER PAE ane HEERE Hh aar s anuna ETH TH Cie EERTE A e a HE Hat HH aa ELSE 400 sees 50 DEGREES ABOVE AMBIENT C oc 50 C 100 C 150 C INDICATED SURFACE TEMERATURE l DEGREES ABOVE AMBIENT Figure 1 initial Case Temperature Above Ambient ys Meter Reading Above Ambient INITIAL SURFACE TEMPERATURE IN 1 When measuring higher than ambient temperatures adjust the connection between the probe and the surface until you get the highest temperature reading 2 When measuring lower than ambient temperatures adjust the connection between the probe and the surface until you get the lo
12. west temperature reading 3 When measuring near ambient temperatures make the _ reading when the multimeter readout is most stabie THEORY OF OPERATION The Model 80T 150U uses the negative temperature coefficient ofa semiconductor P N junction to measure temperature The PN junction is thermally integrated into the probe tip and comprises one leg of a bridge circuit as shown in the simplified circuit diagram of Figure 3 One 9V battery is used to power boththe bridge circuitand operational amplifier AR1 Since the bridge must be balanced to provide 0 C and 0 F indications separate range or temperature scale resistors R7 and R6 are included in the bridge circuit When R6 and R2 are shorted by St the C scaleis selected and the bridge jg calibrated by R3 to null at 0 C Conversely when S1 is open the 0 F scale is selected and the bridge is calibrated by R2 to nuli at 0 F Deviations above and below 0 provide a bridge output of approximately 2 45 mV C Operational amplifier AR1 is used to measure the bridge outputand scale itto a 1 mV degree signal Since the C and the F scaie are sloped differently the scale for AR1 must be matched with the scaie selected for the bridge circuit Shorting resistors R15 and R18 selects the C scale Conversely when S1 is open the F scale is selected Resistor R4 calibrates both scales The output voltage used to drive the external voltmeter is taken from the output of AR
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