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Temperature Q&A with JR: We are seeing false readings in our outdoor temperature measurement application due to environmental exposure

Temperature Q&A with JR: We are seeing false readings in our outdoor temperature measurement application due to environmental exposure

Q: We have several outdoor temperature applications where we measure the temperatures of pipes running alongside cooling towers. These sensors are in several different locations and zip-tied to the outer surface of the cooling pipes. Our problem has been that exposure to rain, sun and heavy snow causes signals to drop off or spike. We believe moisture is getting into the wire jacket and the environmental exposure is causing false readings. The sensors we use have a PVC jacket over the lead wires and it shows cracking over time. We need to replace the sensors and would like a 4-20mA output signal to go from our junction box out to the field instead of running the sensor lead wires all the way back to our monitoring system. What type of solution do you have for this?

A: Surface mounted temperature measurements is an area Moore Industries excels in and we build a variety of mountable measurement devices. Our WORM sensors offer Flex Armor Cable or Stainless Steel braid options to provide greater protection from exposure. Also, we offer sensors that have Teflon insulated leads with a Teflon jacket that can withstand liquids and provide protection from cracking with a temperature tolerance from -200 to +500°F.

To secure the WORM sensor to your pipe, use our “CLAMP” fitting which uses a pipe band for a secure fit. We can add Flex Armor over the Teflon jacket and run it along the surface of the pipe and back to your junction box. At the junction box you can install one of our TRY/TRX or THZ3 two-wire loop powered Hockey Puck (HP) housed temperature transmitters to achieve a 4-20mA output that can be wired back to your monitoring system over your existing lead wires (we also have additional installation options if an HP transmitter will not fit in your existing junction box). 

Published: May 25, 2016
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