Wahl 392M Instruction Manual Download | Manualshive

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HEAT-Prober

®

P

LATINUM

-RTD

T

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

W-392 (Rev. M)

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Summary of Contents for 392M

Page 1: ...Prober PLATINUM RTD THERMOMETERS 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 W 392 Rev M ...

Page 2: ...s authorized to assume for Wahl any liablility 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 Due to the environmental nature of their use probes cannot be replaced without cost unless returned unused within a 30 day period Wahl assumes no liability for damages of any ...

Page 3: ...y in all light conditions To minimize power drain the display is multiplexed The LCD display is 0 4 high with excellent contrast A large portion of the circuit is designed with low power C MOS components The result is a design which provides a low power drain operation which allows operation for 8 hours per charge for the 392E 392EX 392M and 392MX meters Battery life is 50 hours for the replaceabl...

Page 4: ...e to conserve battery life 2 1 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 The digital readout will show resolution to 0 1 increments from 180 0 C to 190 C or 290 F to 375 F At approximately 190 C or 375 F ...

Page 5: ...able of 50 hours continuous operation 2 4 1 Recharging To recharge the batteries use the recharger supplied Plug in directly to 115VAC 60 cycle wall plug and insert jack into socket on left side of HEAT Prober For overseas 220 volt lines use a Franzus converter adapter with the recharger supplied or request a 220 volt recharger 2 4 2 Continuous Operation The 392HP 392E 392EX 392M and 392MX HEAT Pr...

Page 6: ...a body temperature it requires good contact with that body or in the case of liquids or gases good immersion and mixing A portable probe temperature sensor must have the following characteristics a a low thermal mass product of its specific heat and weight b a large area for surface contact to permit heat transfer between the object being measured and the probe sensor c a minimum of heat conductio...

Page 7: ...thane Propane E Metal Dust F Coal Dust and G Grain Dust All 392 Models Available in F C or Dual Scale add F C or D to Model Number Dual Scale not available on S Models 392 SERIES METER SPECIFICATIONS Model 392M 392MX 392M S 392MX S 392VX Range 60 to 752 F 51 to 400 C 60 to 752 F 51 to 400 C Digital Display 392M 392M S Bright 0 33 high LED Red 0 4 high LCD 392MX 392MX S Red 0 4 high LCD Resolution ...

Page 8: ...igure 5 1 392M Platinum Heat Prober with Wahl Calibrator Model Number CAL392HT 6 0 SET UP 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 C Power supp...

Page 9: ...t a quick and accurate calibration can be achieved 6 6 1 Setup and Calculations The decade resistor box may be used as the source to perform a standard calibration A coiled cord cable with connector for the Wahl probe should be used Model Number 10434 01 This has an approximate resistance of 0 36 ohms The actual resistance should be determined for your setup and this value used in the calculations...

Page 10: ...and 392EVX 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 11: ...e 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 In this version a special 4 pin receptacle is installed at the probe connection and the four pins are wired to the printed circuit board from the probe con nector side as shown in Figure 8 1 A resistor with a nominal...

Page 12: ...the program Details of the components will be discussed in this section 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 The data memory RAM is cleared the input output ports are co...

Page 13: ...rage be crammed with new data Additionally if over range is displayed indicating on open probe lead or removed probe conditions are set for the next entry into Gaincheck to cause the compensation reading to be crammed and also that rapid updates to it are to be made on following passes This is done to accommodate changes in probes by the user so that the display will repre sent the actual probe re...

Page 14: ... 58MHz square wave with levels from 0 to 5 volts Replace U6 If still no display go to Step 9 Replace U4 If still no dis play go to Step 7 4 Check voltage at Q4 collector It should be equal to the battery voltage or applied voltage from test power supply Proceed to next step Check for open trace from Pin 5 to Q4 C 5 Check voltage on junction of R30 and CR5 cathode Should be 5 000 005V Proceed to ne...

Page 15: ...16 Return unit to factory for repair NOTE Does not apply to 392MX and 392M with Serial Numbers before N120 11 0 ACCESSORIES 392 SERIES CALIBRATORS Model Number Usable With Meter Calibration Points CAL392 HT 392E 392EX 392EVX 392M 392MX 392VX and 700M 58 F 32 F 212 F 284 F 752 F 50 C 0 C 100 C 140 400 C CAL392HP HT 392HP only CAL392 LT 392E 392EX 392EVX 392M 392MX 392VX Ice Point to Boil Calibrator...

Page 16: ...s the same as the 392M which is a recharge able nickel cadmium battery pack composed of five AA size cells with a com bined voltage of 6 0 volts and capacity rating of 65 amp hours The unit is supplied with a recharger which can be plugged in at any time to maintain the charge of the battery pack Low battery condition is displayed as L in the left hand side of the display The 700M is available onl...

Page 17: ...50 plug connector 3 Set resistance to 29 490 ohms and adjust R5 for a display read ing of 0 00 C 32 F 4 Set the decade box to a resistance of 2760 ohms and adjust R13 for a display reading of 60 00 C 140 00 F 5 Set the decade box to a resistance of 12 260 ohms and check the unit for a correct display reading of 20 00 C or 68 00 F 6 Repeat steps 3 4 and 5 as necessary for best calibration 14 0 392M...

Page 18: ...d to next step 8 Measure voltage at pin 6 of wire harness It should be equal to the battery or power supply voltage Proceed to next step Check wire harness for broken wires 9 Replace Q1 and repeat Step 7 Done Go to Step 19 10 Unit con stantly read OL Measure voltage at U4 28 with DVM It should be 4 3 0 2V Go to step 12 Proceed to next step 11 Check voltage at U3 8 It should be 5 0V 0 25V Replace U...

Page 19: ...u 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 Shipping Material being returned should be packed well preferably in the original foam shipping container Ship to WAHL INSTRUMENTS...

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