|AutomationDirect Live Chat|
Vendor / Manufacturer
Temperature Sensor Basics
Resistance Temperature Detectors (RTDs) have a linear increase in resistance as temperature rises. RTDs come in 2-wire, 3-wire 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.
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 thermocouples include: they are less linear and accurate than RTDs, a matching extension wire is needed, and thermocouples are sensitive to electrical noise.
AutomationDirect offers a variety of RTD probes and sensors:
PT100 RTD Sensors and RTD Probes
(with free tech support and 30-day money-back guarantee)
|| Probes (with Connection Head)
|| Probes (Spring-loaded with Connection Head)
| Probes (with Hex Nipple)
|| Probes (Spring-loaded with Hex Nipple)
| Probes (with Attached Plug)
|| Probes (with Lead Wire Transition)
| Probes (with M12 Cable Connection)
|| Sensors (Adjustable Immersion)
| Probes (with Sanitary RTD Connection)
|| RTD Sensors (Bolt-on Ring)
| Room Temperature Sensors (Wall-mount)
For indoor use to measure ambient air temperature.