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W-683

Rev G

Revised 02/0

3

/23

HEAT-PROBER

®

PORTABLE THERMOCOUPLE

THERMOMETERS

INSTRUCTION MANUAL

LCD Models

LED Models

2500MX

1370MX

2500M

2500MVX

1370MVX

1370M

3200MX

1770MX

3200M

3200MVX

1770MVX

1770M

TCMR-K

TCMR

-

K

X

TCMRK

-

VX

1
2
3
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Summary of Contents for 2500MX

Page 1: ...Revised 02 03 23 HEAT PROBER PORTABLE THERMOCOUPLE THERMOMETERS INSTRUCTION MANUAL LCD Models LED Models 2500MX 1370MX 2500M 2500MVX 1370MVX 1370M 3200MX 1770MX 3200M 3200MVX 1770MVX 1770M TCMR K TCMR...

Page 2: ...l factory of the difficulty Give model number and description Wahl will authorize return and notify our service department to receive the unit 2 Return the instrument in its shipping container to the...

Page 3: ...3 1 Zero Adjustment Using Wahl Calibrator 18 5 3 2 Span Adjustment Using Wahl Calibrator 18 5 4 Calibration With a Millivolt Source 18 5 4 1 Zero Adjustment with Millivolt Source 18 5 4 2 Span Adjustm...

Page 4: ...6 Figure 3 1 Heat Prober Thermocouple Types Model Numbers 8 Figure 3 2 Standard Wahl Probes 10 Figure 3 3 Extension Probe Handle 10 Figure 3 4 Molten Metal Dip Stick 12 Figure 5 1 Wahl Calibrator Type...

Page 5: ...Microprocessors hold the thermocouple tables in memory and provide digital processing and control of the information The instrument contains the unique Wahl MAXI TEMP digital peak circuit which gives...

Page 6: ...2 Figure 1 1 Microprocessor Based Thermocouple Digital Thermometer LED display left LCD display right...

Page 7: ...the switch at the left The switch is 3 position the lower detent is marked N for normal temperature monitor ing the middle detent is OFF and the upper detent is marked P for use with Wahl Maxi Temp pe...

Page 8: ...4 Figure 2 1 Digital Heat Prober Major Features...

Page 9: ...t 6 0 volts The LED display demands the largest power drain Depending on the number of digits being displayed the batteries can power the instrument for a minimum of 5 hours or for as long as 6 hours...

Page 10: ...6 Figure 2 2 Replaceable 9V Battery Pack Compartment above Rechargeable Battery Pack Compartment below...

Page 11: ...recharger should be put on immediately after the low battery light comes on Recharge time is 10 to 12 hours but a partial charge can be obtained in 1 hour or less 2 3 3 Continuous Operation The Heat P...

Page 12: ...le thermocouple connector will fit the meter No adapters are needed The thermocouple is compensated where the cold junction is made and cold junction compensation occurs automatically Each meter face...

Page 13: ...fac tory for a special design Wahl specializes in surface temperature measurement probes Models TC808 809 and 810 are exposed element surface probes for fast surface temperature measure ments Because...

Page 14: ...10 Figure 3 2 Standard Wahl Probes Figure 3 3 Extension Probe Handle...

Page 15: ...es of tips with aluminum splash shield and 12 inch cardboard shaft for penetration through slag up to 12 inch immersion 3 1 Open Probe If the thermocouple sensor loses continuity or if no sensor is co...

Page 16: ...12 Figure 3 4 Molten Metal Dipstick...

Page 17: ...surface contact with all of the probe surface Ensure this by holding it squarely on the surface The TC868 and TC869 surface probes are specially designed with a spring loaded tip to provide complianc...

Page 18: ...C 2500MX K 100 to 2500 LCD T C 2500MVX K 100 to 2500 LCD T C 1370M K 70 to 1370 LED T C 1370MX K 70 to 1370 LCD T C 1370MVX K 70 to 1370 LCD T C 3200M S 77 to 3200 LED T C 3200MX S 77 to 3200 LCD T C...

Page 19: ...en Type S Environmental Temperature Range 20 to 140 F 28 to 60 C Temperature Less than 0 05 degree degree Coefficient over ambient range of 0 to 120 F 20 to 50 C Batteries Five pack size AA rechargeab...

Page 20: ...eak reading Digitally implemented C Off Linearization Microcomputer corrected over the entire range Based on IPT S68 curves to 0 5 F 05 F for Type T Peak Hold Microcomputer calculated switch to P to a...

Page 21: ...eat Probers and Fig 5 4 for LCD Heat Probers Turn the Heat Prober to the N position Connect DVM lead to TP1 Connect DVM lead to U1 1 DVM should read battery voltage between 5 5 volts and 6 2 volts If...

Page 22: ...ment Using Wahl Calibrator 1 Set the Wahl calibrator to its maximum temperature setting Adjust the span with resistor R22 The display should read the highest temperature indication on the Wahl calibra...

Page 23: ...Alternate Method Using a Millivolt Source The room temperature from your secondary thermometer needs to be known and recorded Look up the equivalent millivolt signal for this recorded room temperature...

Page 24: ...re from the millivolt value equivalent to your chosen calibration temperature This calculated value is the signal that must be applied to the Heat Prober adjust span compensation with R22 so that the...

Page 25: ...allowable manufacturing tolerance Even though the instrument is characterized with much higher accuracy any particular thermocouple measuring system may have an error contributed by the thermocouple S...

Page 26: ...same temperature 5 If interaction of adjustments are experienced repeat steps 3 and 4 until no further adjustment is required 5 7 TA 70 Thermocouple Calibrator The TA 70 Calibrator is a battery opera...

Page 27: ...ent bat tery drain A LOW battery indication is displayed by a rapidly changing display on the thermocouple Heat Prober under calibration If in doubt as to battery condition meas ure the battery voltag...

Page 28: ...24 Figure 5 2 Heat Prober with Wahl Calibrator...

Page 29: ...25 TP2 R29 R9 R20 TP1 R22 TP3 U 3 Figure 5 3 LED Adjustment Points...

Page 30: ...26 TP2 R29 R9 R20 TP1 R22 TP3 U 3 Figure 5 4 LCD Adjustment Points...

Page 31: ...alog to digital conversion range by selecting one of two analog to digital precision reference voltages Once the range is set the output is read and converted to a temperature reading The conversion a...

Page 32: ...28 Figure 6 1 Program Flow Chart...

Page 33: ...d using R22 R23 R24 R25 and U6 The derived voltages which drive U5 pin 36 are either 1 703 volts or 2458 volts The absolute values may vary in order to compensate for the gain of U3 However the ratio...

Page 34: ...ature to the probe end of the thermocouple This is accomplished by sensing the temperature of the connector with a temperature sensitive diode CR1 and summing its negative temperature coefficient 2 40...

Page 35: ...cycle begins when the microprocessor raises RUN U5 26 After the analog to digital converter initialization sequence the integrator begins ramping up U5 32 the ramp rate determined by the input voltag...

Page 36: ...charge to a point where the circuitry will soon malfunction U2 switches on positive and drives the low battery indicator of the display This occurs at a battery voltage of approximately 5 6 Vdc As the...

Page 37: ...is occasionally a problem with armored cable This results from wear on either the female connection meter or male probe Corrective action replace connectors The most common maintenance problem is bat...

Page 38: ...s may be reversed in the minia ture connector 3 1 Open connector and reverse connectors 4 The readings jump around or are erratic 4 1 If you are in presence of high electrical discharge field such as...

Page 39: ...ery or replace 6 2 Return to factory for repair or refer to diagnostics Sec 8 0 7 Display functions but tem perature readings don t seem right 7 1 Heat Prober is out of calibration 7 2 Bad probe 7 1 D...

Page 40: ...he batteries are in proper working order as described in Section 2 3 before proceeding to this section How to Use This Troubleshooting Procedure Locate the problem in this table and proceed with the a...

Page 41: ...next step Check R31 and R32 10 No low battery indication Check voltage at U2 16 It should be 3 to 5 when U2 15 is higher than 2 0V It should be 4 to 5 when U2 15 is lower than 2 0V Check 03 and MSB o...

Page 42: ...nd 1800 mV adjustable by R22 Replace U6 Proceed to next step 18 Check for 2 5 0 25V at R22 center Check values of R22 5K R23 18 170 R24 302B R25 6096 ohms Replace U1 19 Check voltage at U7 37 It shoul...

Page 43: ...39 Figure 8 1 Block Diagram...

Page 44: ...40 Figure 8 2 LED Component Layout...

Page 45: ...41 Figure 8 3 LCD Component Layout...

Page 46: ...94 0 6417 0 6640 0 6863 0 7087 0 7310 0 7534 0 7758 0 7981 0 8205 0 8430 0 8654 0 8878 0 9103 0 9327 0 9552 0 9777 1 0002 78 0 79 0 80 0 81 0 82 0 83 0 84 0 85 0 86 0 87 0 88 0 89 0 90 0 91 0 92 0 93...

Page 47: ...0 37 0 38 0 39 0 40 0 41 0 42 0 43 0 44 0 0 0000 0 0395 0 0790 0 1186 0 1583 0 1979 0 2377 0 2774 0 3172 0 3571 0 3970 0 4369 0 4769 0 5169 0 5570 0 5971 0 6372 0 6774 0 7176 0 7578 0 7981 0 8385 0 87...

Page 48: ...0 6416 0 6639 0 6862 0 7086 0 7310 0 7533 0 7757 0 7981 0 8205 0 8430 0 8654 0 8878 0 9103 0 9328 0 9552 0 9777 1 0002 78 0 79 0 80 0 81 0 82 0 83 0 84 0 85 0 86 0 87 0 88 0 89 0 90 0 91 0 92 0 93 0...

Page 49: ...7 0 38 0 39 0 40 0 41 0 42 0 43 0 44 0 0 0000 0 0395 0 0790 0 1186 0 1582 0 1979 0 2376 0 2773 0 3171 0 3570 0 3969 0 4368 0 4768 0 5168 0 5569 0 5970 0 6371 0 6773 0 7175 0 7578 0 7981 0 8385 0 8789...

Page 50: ...0 0902 0 0934 0 0966 0 0998 0 1031 0 1063 0 1096 0 1128 0 1161 0 1194 0 1226 0 1259 0 1292 0 1325 0 1358 0 1392 0 1425 78 0 79 0 80 0 81 0 82 0 83 0 84 0 85 0 86 0 87 0 88 0 89 0 90 0 91 0 92 0 93 0...

Page 51: ...37 0 38 0 39 0 40 0 41 0 42 0 43 0 44 0 45 0 0 0000 0 0054 0 0108 0 0163 0 0218 0 0273 0 0328 0 0384 0 0440 0 0496 0 0552 0 0609 0 0666 0 0723 0 0780 0 0837 0 0895 0 0953 0 1101 0 1070 0 1128 0 1187 0...

Page 52: ...0 0902 0 0934 0 0967 0 0999 0 1032 0 1064 0 1097 0 1129 0 1162 0 1195 0 1228 0 1260 0 1293 0 1326 0 1360 0 1393 0 1426 78 0 79 0 80 0 81 0 82 0 83 0 84 0 85 0 86 0 87 0 88 0 89 0 90 0 91 0 92 0 93 0...

Page 53: ...7 0 38 0 39 0 40 0 41 0 42 0 43 0 44 0 45 0 0 0000 0 0054 0 0109 0 0163 0 0218 0 0273 0 0329 0 0384 0 0440 0 0496 0 0553 0 0609 0 0666 0 0723 0 0780 0 0838 0 0896 0 0954 0 1012 0 1071 0 1129 0 1188 0...

Page 54: ...50 Figure 11 1 2500M Accessories and Special Purpose Probes...

Page 55: ...eat Prober Silicone Paste DA 10 Black Wrist Strap with Metal Ring and Clip on Hook MA 150 Replacement Battery Charger for 11681 1 120V AC 50 60Hz MA 150E Replacement Battery Charger for 11681 1 220V A...

Page 56: ...n number RMA before returning your instrument to the factory For calibration service or technical support contact Palmer Wahl 234 Old Weaverville Road Asheville NC 28804 Ph 800 421 2853 US only 828 65...

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