Wahl Heat-Prober 392AHP User Manual
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Wahl Heat-Prober 392AHP User Manual

Wahl Heat-Prober 392AHP User Manual

Platinum-rtd thermometers
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Heat-Prober
Platinum-RTD Thermometers
392AHP, 392AM, 392AMX, 392AVX,
392E, 392EX, 392EVX,
392M, 392MX, 392MVX,
360X and 700M
User Manual
Palmer Wahl
234 Old Weaverville Road
-S Models are Discontinued
Asheville, NC 28804
Phone: 800-421-3131
as of 2012
Fax: 828-658-0728
W-392 Rev P
Email: info@palmerwahl.com
Revised 02/03/23
www.palmerwhal.com

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Summary of Contents for Wahl Heat-Prober 392AHP

  • Page 1 Heat-Prober Platinum-RTD Thermometers 392AHP, 392AM, 392AMX, 392AVX, 392E, 392EX, 392EVX, 392M, 392MX, 392MVX, 360X and 700M User Manual Palmer Wahl 234 Old Weaverville Road -S Models are Discontinued Asheville, NC 28804 Phone: 800-421-3131 as of 2012 Fax: 828-658-0728 W-392 Rev P Email: info@palmerwahl.com...
  • Page 2 Wahl. No agent is authorized to assume for Wahl any liability except as set forth above. Warranty: Temperature Probes and Meter Accessories Wahl warrants its Hand-Held Meter Temperature Probes to be free of defects in workmanship or material.

  • Page 3: Table Of Contents

    392E, 392EX, 392EVX, 392HP Platinum Meters 11 MAINTENANCE/REPAIR SETUP AND CALIBRATION Equipment Needed Voltage Regulator Adjustment Low Battery Adjustment and Testing Zero Adjustment Using Wahl Calibrator Span Adjustment Using Wahl Calibrator Adjustment Using Decade Resistance Box. Peak Hold Circuit Fahrenheit to Centigrade Conversion Open Probe Display “Help”...
  • Page 4 ® Heat-Prober Platinum-RTD Thermometers User Manual TABLE OF CONTENTS (Continued) Rate of Change with Hot and Cold Peak Hold (Option R) THEORY OF OPERATION General Program Flow 10.0 392M TROUBLE-SHOOTING AID 10.1 Scope 10.2 Procedure 11.0 ACCESSORIES 12.0 CALIBRATION SERVICE 13.0 THERMISTOR —...

  • Page 5: Introduction

    392EVX and 392VX meters. Continuous operation as well as concurrent battery charging is possible by utilizing the recharger. The instrument contains as a standard, the unique Wahl “Maxi Temp” digital peak hold circuit which gives the user the option to hold the highest temperature sensed. The peak-hold circuit is achieved by the microprocessor scanning the probe input temperature to determine the peak versus an analog circuit.

  • Page 6: Meter Operation

    The Heat-Prober instrument has an accurate measuring range as stated on the front label. The probes, however, may not be capable of this entire range of use. Wahl probes are typically capable of -40°C to 500°C (or -40°F to 900°F).
  • Page 7 ® Heat-Prober Platinum-RTD Thermometers User Manual Figure 2-2. 9V Battery Compartment (top picture); Rechargeable Battery Pack Compartment (bottom picture).

  • Page 8: The Batteries

    Open the back cover, and disconnect from the instrument by means of the Molex connector. Replace with Wahl Model Number 11681-1 or 11681-2 (See Figure 2-2). Model 392EVX and 392VX incorporates a LCD display and a standard 9V battery capable of 50 hours continuous operation.

  • Page 9: Probes

    ® Heat-Prober Platinum-RTD Thermometers User Manual 3.0 PROBES Probes compatible with the 392 Heat-Prober are constructed utilizing a wire wound Platinum RTD sensor with an R0 of 100 Ohms wired in a 3-wire con- figuration to compensate for lead length effects. To provide probe inter- changeability at 0 degrees C, a balancing resistor is added to the sensor circuit and trimmed for a total resistance of 100.94 Ohms at 0°C.

  • Page 10: Temperature Sensors In Use

    ® Heat-Prober Platinum-RTD Thermometers User Manual Thus at 200°C, the expected sensor error could be 0.3°C + .0054 (200) =±1.38°C. 3.2 Temperature Sensors in Use An understanding of heat-transfer is needed for accurate field use of temperature sensors. The sensor measures its own temperature, therefore, to measure a body temperature it requires good contact with that body, or in the case of liquids or gases good immersion and mixing.

  • Page 11: Specifications

    ® Heat-Prober Platinum-RTD Thermometers User Manual SPECIFICATIONS 392 Series Meter Specifications 392E Model 392AHP 392EVX 392EX -290 to 1450°F -290 to 1450°F -290 to 1450°F Range -180 to 788°C -180 to 788°C -180 to 788°C 392E Bright 0.33” LED Bright 0.33” LED Red, 0.4”...
  • Page 12 ® Heat-Prober Platinum-RTD Thermometers User Manual 392 Series Meter Specifications 392AM Model 392AVX 392AMX -60 to 752°F -60 to 752°F Range -51 to 400°C -51 to 400°C 392AM Bright 0.33” high LED Red, 0.4” high LCD Digital Display 392AMX Red, 0.4” high LCD 0.1°below 375°F (190°C).

  • Page 13: Maintenance/Repair

    NIST traceable standard. The WAHL calibrator is a convenient instrument to determine whether a problem is in the probe or the meter. If the meter checks on all 5 calibration points within tolerance, for example, then one will know that the probes are at fault.
  • Page 14 ® Heat-Prober Platinum-RTD Thermometers User Manual Figure 5-1. 392M Platinum Heat Prober with Wahl Calibrator Model Number CAL392HT.

  • Page 15: Setup And Calibration

    6.1 Equipment Needed A. Digital voltmeter, Fluke 41/2 digit Model 8600A or equivalent. B. Wahl Platinum Calibrator (Model Number CAL392HT or CAL392LT) or General Radio decade box, Model 1433-1 (or equivalent) with standard coil cord (Model 10434-01 or 10434-02) cable as used with Wahl probes.

  • Page 16: Low Battery Adjustment And Testing

    6.4 Zero Adjustment Using Wahl Calibrator 1. Insert the Wahl calibrator and adjust the calibrator to the 32°F/0°C position. Apply power to the meter and make an initial adjustment at R5 for a reading of 32.0°F or 0.0°C depending on your model.

  • Page 17: Span Adjustment Using Wahl Calibrator

    Platinum-RTD Thermometers User Manual 6.5 Span Adjustment Using Wahl Calibrator 1. Set Wahl Calibrator for 284°F/140°C and apply power to the meter. Adjust R35 (R16 on HP.) clockwise for a display of 284.0°F or 140.0°C. 2. Repeat the zero span adjustment until the meter reads 32.0°F/0.0°C exactly, and reads 212°F/100°C or 284°F/140°C within accept- able limits of error.

  • Page 18: Peak Hold Circuit

    ® Heat-Prober Platinum-RTD Thermometers User Manual 6.7 Peak Hold Circuit 1. To enable the PEAK HOLD mode, depress the forward/ upper position of the Power Switch. Adjust calibrator or decade box for an upscale temperature reading allowing the display to stabilize. 2.
  • Page 19 ® Heat-Prober Platinum-RTD Thermometers User Manual Models 392HP , 392M and 392E Use the Circuit Board Diagrams on these pages to locate potentiometer placement of Zero Adjustment and Span Adjustment. Note that placement varies with Model. See page 28 for Model 700M Board Layout.
  • Page 20 ® Heat-Prober Platinum-RTD Thermometers User Manual Models 392MX, 392MVX, 392EX, and 392EVX...

  • Page 21: Fahrenheit To Centigrade Conversion

    ® Heat-Prober Platinum-RTD Thermometers User Manual 6.8 Fahrenheit to Centigrade Conversion The Heat-Prober can be ordered as a °F or °C unit. The 392 will read out in °F unless a jumper is in place between terminals “A” and “B” on the PC Board. When jumped an equivalent reading of what was displayed in °F will be displayed in °C.

  • Page 22: 392Hp And 392M Options

    ® Heat-Prober Platinum-RTD Thermometers User Manual 8.0 392M and 392HP OPTIONS 8.1 392HP The “HP” option allows probes to be calibrated and interchangeable over the entire temperature range. This also results in superior system accuracies at all temperatures. The “HP” option utilizes a Noise Rejection program which minimizes transient noise effects.

  • Page 23: Degree F To C Conversions (Suffix D)

    ® Heat-Prober Platinum-RTD Thermometers User Manual 8.3 Rate of Change with Hot and Cold Peak Hold (Order Option R) This unit has microprocessor program revision E which can display any one of four different measurements repeatedly. The four display modes are as follows: 1.

  • Page 24: Program Flow

    ® Heat-Prober Platinum-RTD Thermometers User Manual 9.2 Program Flow When Power is turned on, the program will start executing instructions from address 000, the location of the top level program labeled “Main.” The first routine called is “Initialize”. This is a house-keeping routine which establishes the starting conditions.
  • Page 25 ® Heat-Prober Platinum-RTD Thermometers User Manual Main Program Platinum Heat-Prober 392M Power On Initialize Evaluate Compensation Circuits Get Probe Reading Compensate As Required Range Check Changed Lookup Temperature °F/°C Display Temperature Monitor/Peak Figure 9.1. Flow Chart...
  • Page 26 ® Heat-Prober Platinum-RTD Thermometers User Manual The next routine entered, “Get Probe”, performs as described above for the compensation readings; however a separate moving average is maintained for the probe readings. Both use a common subroutine, “Get M.A.”, which calls “Get ND”. Control and handshaking between the converter and the computer is performed by this latter subroutine.

  • Page 27: 392M Trouble-Shooting Aid

    This section describes basic diagnostics to find the majority of the problems with malfunctioning 392M units. Equipment Required: 1. Wahl 392M Calibrator (Model Number CAL392-HT) 2. 4- Digit DVM, Fluke 8600A or equivalent. 3. Oscilloscope. 4. Power supply, Power/mate BPA-10c or equivalent.
  • Page 28 ® Heat-Prober Platinum-RTD Thermometers User Manual 392 SERIES TROUBLE SHOOTING PROCEDURE Step Problem Action to be Performed If Correct If Incorrect Blank Measure voltage at U6-19 with DVM. Proceed Proceed to Step 3. Display* It should be at +4.3 ±.2V. to Step 2.
  • Page 29 392 SERIES TROUBLE SHOOTING PROCEDURE Step Problem Action to be Performed If Correct If Incorrect Set the Wahl Calibrator to 212°F and If any voltage is insert into the T/C connector. Use DVM incorrect, check Proceed to to measure the following voltages U3-12...

  • Page 30: Accessories

    ® Heat-Prober Platinum-RTD Thermometers User Manual 11.0 ACCESSORIES 392 Series Meter Accessories DA-4 Heat-Prober Silicone Paste DA-10 Black Wrist Strap with Metal Ring and Clip-on Hook Replacement Battery Charger for 11681-1, 100-240VAC MA-150 50/60Hz Replacement Battery Charger for 11681-1, 100-240VAC MA-150E 50/60Hz, with European plug adapter Replacement Spare NiCad Battery Pack, Requires MA-...

  • Page 31: Calibration Service

    ® Heat-Prober Platinum-RTD Thermometers User Manual 12.0 CALIBRATION SERVICE Recalibration service can be provided at a nominal cost, if desired. Special thermal calibration traceable to NIST is available. Standard temperature points are: 0°C, 94°C, and 250°C. Custom points are available upon request. TOLERANCE (PROBE INTERCHANGEABILITY) Temp °C -250...

  • Page 32: Heat-Prober (700M)

    700M THERMISTOR .01°C/F RESOLUTION HEAT-PROBER 13.1 General Discussion The Wahl Thermistor unit measures temperature over a range of -1.00°C to 60.99°C (30.20°F to 141.78°F) with .01°C resolution. The sensing element in the probes is a highly stable thermistor, with .1°C interchangeability, the out- put being processed and linearized before display. The accuracy of the meter is .02°C.
  • Page 33 ® Heat-Prober Platinum-RTD Thermometers User Manual Figure 13.1. 700M Circuit Board Layout...

  • Page 34: Calibration Procedure

    ® Heat-Prober Platinum-RTD Thermometers User Manual 13.2 Calibration Procedure (See Figure 13-1) 13.2.1 Equipment Required 1. Digital Voltmeter, Fluke 8600 41/2 digit or equivalent. 2. Decade resistance box with a range to 30K and resolution to one ohm. Accuracy required can be determined by using the thermistor slope at 60°C where an error of 1 ohm is equivalent to .01°C.

  • Page 35: 700M Trouble-Shooting Aid

    ® Heat-Prober Platinum-RTD Thermometers User Manual 14.0 700M TROUBLE-SHOOTING AID 14.1 Scope This section describes basic diagnostics to find the majority of the problems with malfunctioning 700M units. Equipment Required: 1. Decade Resistance Box 2. 4- Digit DVM, Fluke 8600A or equivalent. 3.
  • Page 36 ® Heat-Prober Platinum-RTD Thermometers User Manual HOW TO USE TROUBLE-SHOOTING PROCEDURE: Locate the problem on this table and proceed with the action starting with Step 1. Note, for all DVM and scope measurements, connect the (-) lead to TP1 (GND). 14.0 700M TROUBLE-SHOOTING AID 700M TROUBLE SHOOTING PROCEDURE...
  • Page 37 ® Heat-Prober Platinum-RTD Thermometers User Manual 700M TROUBLE SHOOTING PROCEDURE Step Problem Action to be Performed If Correct If Incorrect Check voltage at U1-5. It should be Replace U1. Go to Step 16. +0.561V ±0.005V. Check voltage at U2-10. It should be Proceed to Go to Step 19.

  • Page 38: Return For Repair/Calibration

    Platinum-RTD Thermometers User Manual 15.0 RETURN FOR REPAIR/CALIBRATION SERVICE Warranty Repair Information Please contact Wahl Customer Service at (800) 421-2853 for a return Merchandise Authorization 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) 828.658.3131...

This manual is also suitable for:

Heat-prober 392amHeat-prober 392amxHeat-prober 392avxHeat-prober 392eHeat-prober 392exHeat-prober 392evx ... Show all

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