ONICON System-30 BTU - Manual (Page 11)

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System-30 BTU Measurement System Manual 05/14 - 0667-2 / 18335
Page 11
3.2.2 Thermowell Installation
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.
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Standard Thermowell
The most common installation methods are shown below. Consult ONICON 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 thermal compound 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 OVERTIGHTEN. 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
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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