ONICON System-10 BTU - Manual (Page 12)

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System-10 BTU Meter Manual 03/15 - 0651-16 / 18323 Page 12
Insertion of the Hot Tap Thermowell
1) Calculate the insertion force (lbs) required by multiplying the system pressure
(psig) by 0.11. The person inserting the thermowell should ensure adequate
footing for the force required prior to opening the valve.
2) Thread the hot tap adapter into the valve. Firmly grasp the wiring enclosure,
loosen the position clamping nut, open the valve, and carefully push the
thermowell into the flow stream. Use the attached gage to set the insertion depth.
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CAUTION
Excessive vibration can damage the thermowell. Insert the thermowell to the proper depth using
gauge supplied as shown. Reduce the insertion depth as necessary if strong vibrations are felt
during insertion, making certain that the tip of the thermowell remains fully in the flow stream.
3) Carefully tighten the position clamping nut that is located at the top of the 1"
NPT hot tap adapter fitting. Do not release the wiring enclosure until the position
clamping nut has been tightened.
CAUTION
DO NOT OVER TIGHTEN THE POSITION CLAMPING NUT. If fluid leaks, do not attempt to
correct by tightening this nut further. An internal o-ring seals the fluid. Contact ONICON for
assistance in the event of a leak.