Resistance Temperature Detectors (RTDs)
Resistance Temperature Detectors are sensors that measure temperature by correlating the resistance of the RTD element with temperature. Most RTD elements consist of a length of fine coiled wire wrapped around a ceramic or glass core. The element is typically relatively fragile, so it is generally installed inside a sheath to protect it. The RTD element is constructed from a pure material, the resistance of which, at various temperatures, has been documented by various international standards institutes. The material has a predictable change in resistance as the temperature varies; it is this change that is used to determine temperature. RTDs are generally considered to be among the most accurate temperature sensors available.In addition to providing very good accuracy, they feature excellent stability and repeatability. RTDs also provide high immunity to electrical noise and are, therefore, well suited for applications in process and industrial automation environments, especially around motors, generators and other high voltage equipment.
Weed Instrument RTDs
We manufacture an almost infinite variety of RTD sensors and assemblies, and most can be supplied in 48 hours or less. Options include combinations of different element materials, values and accuracies, a choice of element leadwire configurations, and a selection of sheath materials and diameters. Many of our RTD assemblies are supplied in drilled or flanged wells, and all assemblies can be supplied with our economical, head mount or DIN-rail mounted transmitters. If you can’t find a catalog RTD for your application, just contact us – custom versions can often be fabricated in less than a week!
Typical RTD Applications
- Furnaces
- Microelectronics
- Medical research
- Textile production
- Plastics processing
- HVAC and refrigeration
- Foodservice processing
- Petrochemical processing
| 101, 102 & 103 |
General Purpose |
| 110 |
Field Cuttable |
| 120 |
Hand-Breakable |
| 201 & 203
| RTDs with Welded Fittings |
| 301 & 304 |
Spring Loaded with Explosion Proof Housing |
| 302 & 303 |
Spring Loaded without Transmitter for General Purpose Housing |
| 305 |
Spring Loaded, 1/2" NPT Hex Nipple |
| 312 |
Spring Loaded, 1/2" NPT Hex Nipple |
| 451 |
Direct Immersion Sanitary |
| 452 |
Spring Loaded Sanitary Temperature Sensor |
| 461 |
Sanitary RTD with Removable Sensing Element |
| 2543
| Non-Intrusive Flow Through Sanitary Sensor |
| 3142B
| Sanitary Flush Mount Tank Temperature Sensor |
| 3226A
| Food Piercing Temperature Sensor |
| 3304A
| Flexible Stick-on Surface Temperature Sensor |
| 3312A
| Autoclave Temperature Sensor |
| 3332A
| Embedded Temperature Sensors for Rotating Machinery and Turbines |
| Bearing Temperature
| Sensors for the Measurement of Bearing Temperatures |
| Bayonet Fitting Design
| Spring Loaded Bayonet Fitting Temperature Sensors |
| Flow Computer/Corrector RTDs
| Temperature Sensors for Flow Computers and Gas Correctors |
General Specifications
Resistance vs Temperature Tables: Chart1 & Chart 2
How to Size a Sensor
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