cold temperature monitoring
Paul Daniel and Jon Aldous
Chamber vs room monitoring
Which temperature sensors are best for your application?
Many chamber applications are cold temperature applications and usually temperature is the only parameter monitored. Cold air cannot hold much moisture so it is uncommon to use a humidity sensor in a cold temperature situation.
In our experience, when folks want to monitor cold temperatures, they simply select a vendor, then accept the sensor type that the vendor has decided here are four different sensor types
will work best in that particular application. So,
commonly used for cold temperature monitoring:
in many cases the decision of what sensor to use
• Mercury or alcohol thermometer.
is based on your choice of vendor. Monitoring
• Thermistor (thermal resistor).
does not require a high accuracy sensor for most
• Resistance temperature detectors (RTDs)
applications, especially for cold temperatures,
usually made from a pure metal, such as
so most types of sensors can be used with equal
platinum, copper or nickel, around a ceramic
efficacy. However, it can be valuable to understand
or glass core.
how each of the four types of sensors work in case
• Thermocouple, two wires of different metals.
there are variables in your environments that will
The junction between the two metals will show
cause one sensor to function better, last longer,
a voltage change from a change in temperature.
and measure more accurately.
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