Tempco manufactures three types of high quality temperature sensors:
To help our customers understand sensors better, we have listed the construction and benefits of each type below. Additionally, Tempco's Sales and Engineering teams can help you:
Resistance Temperature Detectors (RTD's) are temperature sensing devices consisting of a wire coil or deposited film of pure metal, usually platinum. The element’s resistance increases with temperature in a known and repeatable manner. RTD's exhibit excellent accuracy over a wide temperature range, –200°C (-328°F) to 650°C (1202°F).
RTD's Offer:
A thermocouple consists of two wires of dissimilar metals welded together into a junction. At the other end of the signal wires, usually as part of the input instrument, is another junction called the reference junction. Heating the sensing junction generates a thermoelectric potential (emf) proportional to the temperature difference between the two junctions. This millivolt-level emf, when compensated for the known temperature of the reference junction, indicates the temperature at the sensing tip. Published millivolt tables assume the reference junction is at 0 degrees Celsius.
Thermocouples are simple and familiar. Designing them into systems, however, is complicated by the need for special extension wires and reference junction compensation.
Thermocouple advantages include:
Thermistors are resistive devices usually made of metal oxides formed into a bead and encapsulated in epoxy or glass. Thermistors show a large negative temperature coefficient. Their resistance drops dramatically and non-linearly with a temperature increase. A thermistor’s sensitivity is many times that of an RTD, but its useful temperature range is limited. Because of wide variations of performance and cost among thermistors, generalized advantages and disadvantages may not always apply.
Typical benefits are:
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