Thermocouple Temperature Sensors

Thermocouple Temperature Sensors

Dwyer Instruments, Inc. offers many temperature measuring products that use thermocouples as the sensing element, and also manufactures a wide variety of thermocouples.

A thermocouple is made of two dissimilar metal wires, which product a voltage as a function of temperature change. Thermocouples are based on the Seebeck effect, which is a thermoelectric effect where continuous current is created in a circuit where the junctions of two dissimilar conductive materials are kept at different temperatures. The measuring end of the sensor is created by joining the two metal wires together into what is called the hot or measuring junction. Continue reading “Thermocouple Temperature Sensors”

RTD Temperature Sensors

Temperature Sensors

Dwyer Instruments, Inc. offers a wide variety of temperature sensors that use RTDs as the sensing element.

RTDs are based on the principal that the electrical resistance of the wire is a function of the temperature, with the resistance increasing as temperature increases. The resistance varies nearly linearly with temperature per the Callendar Van-Dusen equation. The wire used in RTDs as the sensing element is usually constructed of platinum, copper, or nickel.  Platinum is the best material for this element, as it has the widest useful temperature range of these materials. It also has a very repeatable and linear temperature to resistance correlation. Continue reading “RTD Temperature Sensors”

Infrared Thermometers

Dwyer offers several temperature measuring products that use infrared sensors as the sensing element.


Infrared Thermometers infer the temperature of an object by measuring the infrared thermal radiation emitted from the object. Objects at thermal equilibrium must balance the energy that is entering the object with the energy that is leaving the object.  Often, the energy leaving the object is emitted as electromagnetic radiation. Continue reading “Infrared Thermometers”

Ask the Expert – Hazardous Area Humidity/Temperature Transmitter

Humidity/ Temperature Transmitter, Series RHP

Question: I have a new project coming up, and I am considering using the Series RHP Humidity/Temperature Transmitters. However, the instrumentation needs to be suitable for use in a hazardous area. Would the Series RHP work, or do you have a different instrument that you would recommend for this application? Continue reading “Ask the Expert – Hazardous Area Humidity/Temperature Transmitter”