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APPENDIX
ONICON Incorporated 727.447.6140
A - 2
onicon.com
HEAVY DUTY THERMOWELL ASSEMBLY FOR SYSTEM-10 BTU METERS FOR
PROCESS TEMPERATURES OVER 300°F
Connection Head
1/2” Fitting
1/2” Coupling
1/2” Extension Nipple
Heavy-Duty Thermowell with
1/2” NPT process thread
(Length varies with pipe size.)
When installing, apply wrench
here to tighten.
Retainer Springs
SS Spacer Sleeve
(Length varies with thermowell length.)
Platinum RTD
Transmitter
Retainer Nut
(Finger Tighten Only)
IMPORTANT NOTE
The thermowell, extension nipple, coupling and fitting were made to a specific length. DO NOT attempt to change
the length of this assembly.
Step 1:
Drill 7/8” hole in pipe. Install thermowell using fittings supplied by ONICON.
Complete steps 2 - 4 only after all welding, brazing & soldering are complete.
IMPORTANT NOTE
Each RTD and transmitter pair are matched at the factory and calibrated for a specific BTU meter. Do not separate
the RTD from the transmitter and use care to ensure that the serial number on the transmitter matches the serial
number of the BTU meter.
Step 2:
Remove lid and insert RTD assembly into thermowell, ensuring that it bottoms out. Thermal compound may be used;
apply only a pea-sized amount to the tip of the RTD prior to insertion.
Thread retaining nut onto fitting inside the bottom of connection head. Hand tighten the retainer nut.
DO NOT OVERTIGHTEN
.