FT
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3500 ELECTROMAGNETIC FLOW METER
ONICON Incorporated 727.447.6140 Page 10 onicon.com
1.5.4 Thermowell Installation
IMPORTANT NOTE
It is important that no dirt or other foreign material be allowed into the thermowells as this could aect the ther-
mal response of the system.
Dry tap thermowells are for new construction or scheduled shutdown. The most common installation methods are
shown below. Refer to Appendix A-1 for thermal insulator installations and Appendix A-2 for high temperature (>300°F)
thermowell installations. Consult ONICON for special applications.
Hot tap thermowells are designed for retrot applications where it is not practical to isolate and drain the pipe section
prior to installation. The thermowell is installed through a 1” full port ball valve as shown in the drawing on the next page.
A hot tap drilling machine equipped with a 7/8” drill is required to perform this type of installation.
Install the valve assembly as shown in the drawing and then drill the 7/8” hole using the hot tap drilling machine. Once
the valve assembly has been installed and the hole has been drilled, the thermowell can be inserted into the ow stream
without a system shutdown.
NOTES
1. Thermowell length varies with pipe size.
2. If additional ttings are required, ensure that tip of thermowell is inserted into ow stream.
1.5.4.1 Dry Tap Thermowells
1.5.4.2 Hot Tap Thermowells
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