|AutomationDirect Live Chat|
Vendor / Manufacturer
Thermocouples have two dissimilar metal wires joined at the hot junction. As temperature changes, a millivolt signal is read at the cold junction. The most common types of temperature thermocouples are type j thermocouples and type k thermocouples. Advantages of thermocouple sensors include: low cost, small size, wider temperature ranges and faster response than RTDs. The disadvantages of using temperature thermocouples include: they are less linear and accurate than RTDs, a matching extension wire is needed, and thermocouples are sensitive to electrical noise.
Resistance Temperature Detectors (RTDs) have a linear increase in resistance as temperature rises. RTDs come in 2-,3- or 4-wire versions. A 2-wire RTD signal is affected by the distance to the controller. 3-wire or 4-wire RTDs can compensate for line losses.
AutomationDirect offers a variety of industrial thermocouple temperature sensors:
For more thermocouple products, also see the Temperature Sensors & Transmitters section:
Thermocouple Sensors: Type J, Type K, Type T
|| Probes (with Connection Head)
|| Probes (Spring-loaded with
| Probes (with Hex Nipple)
|| Probes (Spring-loaded with Hex
| Probes (with Attached Plug)
|| Probes (with Lead Wire
| Sensors (Adjustable Immersion
|| Sensors (Bolt-on Ring
Room Temperature Sensors