ONICON System-30 MODBUS BTU - Manual (Page 11)

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System-30 BTU Measurement System MODBUS RTU RS485 04/14 - 0583-1 / 18345
Page 11
3.2.2 Thermowell Installation
Standard Thermowell
The most common installation methods are shown below. Consult the factory for
special applications.
3.2.3 Temperature Sensor Installation
The temperature sensor is factory matched and permanently attached to the BTU
MEASUREMENT SYSTEM. Sensors from different Btu meters cannot be used without
being returned to the factory for recalibration.
Apply a thin coat of thermally conductive grease to the temperature sensor, and gently
insert the temperature sensor all the way into the thermowell until it contacts the bottom
of the cavity. Gently tighten the retainer cap. DO NOT OVER TIGHTEN. The thermowell
completely seals the plumbing system without the retainer cap. The only purpose of the
cap is to keep the sensor from losing contact with the bottom of the thermowell cavity.
IMPORTANT NOTE
It is important that no dirt or other foreign material be allowed into the thermowell as this could
affect the thermal response of the system.
CAUTION
Cable length is specified at time of order. This is three wire shielded plenum rated cable.
Altering the cable length will affect calibration. Do not change the cable length without
consulting ONICON.
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