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This month we explain a simple way to monitor temperature inside an enclosure using our ST132 modules. We are also proud to announce that our ST130 Series temperature transmitters have received ATEX Certification. And Acromag's President Dave Wolfe asks from his blog "Are your signal conditioners and isolators ready for harsh environments?."
For more information, call our sales engineers at 877-295-7035 to discuss your application or request a quote.
Low-Cost Box Temperature Sensor Application
If you need a simple way to monitor temperatures inside an enclosure, Acromag’s ST132-0600 temperature transmitter is compact, inexpensive and provides 4-20mA output. The tiny, puck-style unit is only 1.75 inches in diameter and easily scaled for -40 to 80°C input. Just mount the transmitter inside your panel and jumper short the input terminals to measure ambient temperature without a sensor. Then wire the 4-20mA output to your PLC, DCS, controller, or recorder. You now have a low-cost box temperature sensor with 4-20mA output proportional to -40 to 80°C inside the box. No thermocouple or other sensor is necessary. This approach uses the internal cold-junction compensation ambient temperature sensor within the ST132 transmitter. The ST132 is highly accurate, stable, and best of all, it is only $89!
Two-Wire Temperature Transmitters Receive ATEX Certification
Acromag's ST130 Series head-mount temperature transmitters recently received ATEX approval for use in explosive atmospheres. The ATEX certification is Ex II 3 G Ex nA IIC T4 Gc -40°C ≤ Ta ≤ +80°C (explosion-protected for Category 3G, Group II, Zone 2 gas atmospheres; non-incendive).
ST130 temperature transmitters are USB-configured, loop-powered and provide a proportional 4-20mA output. Three models are available.
ST131: RTD sensor or 100 ohm resistance input (non-isolated)
ST132: Thermocouple or 100mV input (non-isolated)
ST133: Thermocouple or 100mV input (isolated)
Acromag's President's blog:Wolfe Tracks
Are Your Signal Conditioners and Isolators ready for Harsh Environments?
Years ago, I was invited to an automotive plant used to stamp body parts from metal sheet stock. It seems that the plant had over 500 temperture transmitters. The transmitters were failing and nobody knew why. They wanted to replace all of them with a new supplier. I was somewhat excited about the opportunity but I did not know what the problem was. The devices were installed in explosion proof housings and the temperature was around 70°F. Not too bad, I thought. When I climbed up on the catwalk to look at one, I realized what the problem was. The large low-inertia motors of the stamping presses were shaking the whole building with a low frequency but steady vibration. After looking at a failed device, I could see a solid core wire that was cracking due to the high vibration. That was the point that I realized how important it was to design equipment for the worst environmental conditions because you can't predict where they will end up. Continue reading.