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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?

Published: May 25, 2016

Temperature Q&A with JR Madden: Process Temperature Measurements Shift With Outside Air Fluctuations

Temperature Q&A with JR Madden: Process Temperature Measurements Shift With Outside Air Fluctuations

Q. We have several short thermowells in our process, ranging from 2-inches to 6-inches. Our process is very stable, but we have noticed a temperature measurement shift when the outside air temperature rises or falls. We have tried calibration, but it still doesn’t correct the temperature swing we see. What would you suggest we change that will prevent these temperature swings?

Published: April 27, 2016

Temperature Q&A with JR Madden: Our 3-Wire RTDs Drift and Require us to Recalibrate our Temperature Transmitters

Temperature Q&A with JR Madden: Our 3-Wire RTDs Drift and Require us to Recalibrate our Temperature Transmitters

Q. We have been using 3-wire RTDs in our process for years and are required to check the calibration once every 6 months. Each time we have checked the sensors we’ve noticed they have drifted. This requires us to re-calibrate our temperature transmitters. Do you have something you can suggest to help us reduce the drifting problem we regularly see in these sensors?

Published: April 13, 2016

Temperature Q&A with JR Madden: What Thermowell and Thermocouple Type Should I Use with my High Temperature Application?

Temperature Q&A with JR Madden: What Thermowell and Thermocouple Type Should I Use with my High Temperature Application?

Q. I have a temperature application that requires a 12-inch thermowell which can withstand a high temperature of 2,000°F. Most of what we have been using becomes brittle and breaks off at the tip. What would you suggest we use, and what type of sensors do you have that will work for us?

Published: March 30, 2016

New Problem Solver Highlights Backup and Fail-Over Protection of STZ

New Problem Solver Highlights Backup and Fail-Over Protection of STZ
The SIL 3-capable STZ Functional Safety Dual Input Smart HART Temperature Transmitter has several features designed to reduce process interruptions safely in your SIS. One of the most important is the new dual sensor input that allows for Backup and Fail-Over Protection, which is the topic of a new Problem Solver on the Moore Industries website.

Published: October 19, 2015
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