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Chromalox 3901 User’s Manual 13

Section 4

Calibration

☛

The 3901 controller has been calibrated and tested at

the factory prior to shipment. Calibration on receipt is

not necessary.

Equipment

Required

A precision thermocouple simulator and a small

instrument screwdriver are necessary to calibrate the

controller.

Locating

Calibration

Adjustments

Remove the back cover from the controller as

described on page 4. Figure 4.1 identifies the zero and

span calibration potentiometers.

Zero Potentiometer

Span Potentiometer

➛

Calibration

Procedure

1. Connect the sensor simulator to terminals 7 and 8,

making sure to connect the (+) to 7 and (-) to 8.

2. Set the sensor simulator to a minimum value (200°F

for J T/C, 350°F for K T/C). While pressing the

“READ TEMP” pushbutton, adjust the zero

potentiometer until the digital display equals the

sensor input value (200°F or 350°F).

(continued on next page)

Figure 4.1

Zero and Span

Calibration

Potentiometers

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