ESP: Heater Chamber Temperature Adjustment Procedure

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The Resistance Temperature chart below gives the characteristic of the temperature sensor used in the ESP Heater Chamber.

The following procedure can be used to adjust the heater to a different temperature (less than 80ºC scanner operating temperature).

1. Determine a control set point temperature fitting the application.
2. Connect an Ohmmeter to the two test points on the Heater Chamber.
3. Adjust the potentiometer until the value read from the chart is indicated on the meter.

Note 1: This procedure results in a temperature setting within ±3º of the desired setpoint.

Note 2: The heating element in the Heater Chamber can develop about 33 watts of power. The chamber provides insulation, however there are limitations for achievable regulation. The Heater Chamber reduces the temperature effect to the scanner by a factor of 10:1.

Note 3: It is recommended to set the Heater Chamber temperature setpoint to 5ºC above the expected ambient temperature. Maximum scanner temperature environment is 80ºC.

Note 4: For operation in a very cold environment (-50ºC), it is important to set the temperature to above freezing (0ºC), so water condensation does not occur.

Note 5: Factory default temperature setpoint is 40ºC.

No. 0704

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