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Summary of Contents for Wahl HEAT-Prober 392HP
- Page 1 W-392 (Rev. M) HEAT-Prober ® -RTD LATINUM HERMOMETERS Models 392HP, 392E, 392E-S, 392EX, 392EX-S, 392EVX, 392M, 392M-S, 392MX, 392MX-S, 392VX, 360X and 700M INSTRUCTION MANUAL ©Copyright 2004 Wahl Instruments, Inc. Printed in USA...
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Page 2: Table Of Contents
Voltage Regulator Adjustment ages, following the use or misuse of instruments sold by Wahl. No agent is Low Battery Adjustment and Testing authorized to assume for Wahl any liablility except as set forth above. -
Page 3: Introduction
Peak Hold (Option R) instrument with its own rechargeable battery power supply and recharger for the 392HP, 392E, 392EX, 392M and 392MX, standard 9 volt replaceable bat- THEORY OF OPERATION tery for the 392EVX and 392VX and a group of interchangeable probes General designed for rapid and accurate temperature measurement. -
Page 4: 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 5: The Batteries
2.4 The Batteries The 392HP, 392E, 392EX, 392M, and 392MX HEAT-Prober are powered with five size AA rechargeable nickel-cadmium batteries, 1.2 volts each. The total capacity is 650 milliampere hours at 6.0 volts. The 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 8 hours. -
Page 6: Probes
A portable probe temperature sensor must have the following characteristics: (a) a low thermal mass (product of its specific heat and weight); The High Performance HEAT-Prober, Model 392HP, utilizes probes similar to (b) a large area for surface contact to permit heat-transfer between the... -
Page 7: Specifications
Spurious noise attenuated by internal 16 Hz filter. Noise Rejection Noise Rejection 392HP includes special noise rejection program for use in presence 392HP includes special noise rejection program for use in presence of rampant EMF such as spark ignition engines. -
Page 8: Maintenance/Repair
Figure 5-1. 392M Platinum Heat cies it is possible to use a 9-volt transis- significant digit position of the 392HP, 392E and 392M display. “Lo Bat” Prober with Wahl Calibrator appears in the display of the 392EX, 392MX, 392EVX and 392MVX. The actu- tor battery to power the HEAT-Prober (but Model Number CAL392HT. -
Page 9: Zero Adjustment Using Wahl Calibrator
140.0°C or 284.0°F, ±0.1°. Step 3: Repeat Steps 1 and 2 as necessary for optimum calibration. the 392HP may be made faster by turning the power off and then back on again, any time an input resistance or pot setting is changed. - Page 10 Models 392HP, 392M and 392E Models 392MX, 392MVX, 392EX, and 392EVX 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.
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Page 11: Fahrenheit To Centigrade Conversion
R33 resis- tor would be in the probe. The resistance is adjusted until the 392HP reads 7.0 THERMAL CALIBRATION PROCEDURE the precise temperature of the bath, for example 100°C, taking out the toler-... -
Page 12: Rate Of Change With Hot And Cold
The Flow Chart (Figure 9.1) shows the operation of the program. Details of the components will be discussed in this section. Figure 8-1. Wiring Diagram for 392HP 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.”... - Page 13 for the probe readings. Both use a common subroutine, “Get M.A.”, which Main Program Platinum Heat Prober 392M calls “Get ND”. Control and handshaking between the converter and the com- puter is performed by this latter subroutine. Data is fetched in 2 bytes, first the low order 8 bits, then the high order 4 bits, the sign and over range bits.
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Page 14: 392M Trouble-Shooting Aid
Go to Step 4. with (+) lead at Q4 emitter. open trace Equipment Required: between Q4 1. Wahl 392M Calibrator (Model Number CAL392-HT) emitter and 2. 4- Digit DVM, Fluke 8600A or equivalent. U6-19. 3. Oscilloscope. Check U4-25 with an oscilloscope. -
Page 15: Accessories
Step Problem Action to be Performed If Correct If Incorrect 392 S ERIES ETER CCESSORIES Set the Wahl Calibrator to 212°F Proceed to If any voltage is Model Number Description and insert into the T/C connector. next meas- incorrect, check Use DVM to measure the follow- urement. -
Page 16: Calibration Service
13.1 General Discussion Recalibration service can be provided at a nominal cost, if desired. Special The Wahl Thermistor unit measures temperature over a range of -1.00°C to thermal calibration traceable to NIST is available. Standard temperature 60.99°C (30.20°F to 141.78°F) with .01°C resolution. The sensing element in points are: 0°C, 94°C, and 250°C. -
Page 17: Calibration Procedure
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 18: 700M Trouble-Shooting Aid
HOW TO USE TROUBLE-SHOOTING PROCEDURE: Locate the problem on 700M T ROUBLE HOOTING ROCEDURE this table and proceed with the action starting with Step 1. Note, for all DVM Step Problem Action to be Performed If Correct If Incorrect and scope measurements, connect the (-) lead to TP1 (GND). Check voltage at U1-5. -
Page 19: Warranty Registration
15.0 WARRANTY REGISTRATION Fill out the Warranty Registration Form included in this manual and return to Wahl. We will send you follow-up reminders about recalibration dates. 16.0 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.
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