Thermometrics bearing sensors monitor anti-friction and sleeve bearing temperatures in motors, turbines, pumps, and generators. Spring-loaded RTD and thermocouple elements maintain positive thermal contact against the bearing housing surface for accurate, reliable measurement.
Thermometrics manufactures bearing sensors to industry-standard case geometry specifications. All case styles are available with RTD or thermocouple sensing elements.
| Case Style | Mounting Hole | Body Diameter | Spring Travel | Typical Application |
|---|---|---|---|---|
| Style A | 5/8" - 18 UNF | 1.00" | 0.375" | Standard AC/DC motors, small turbines |
| Style B | 3/4" - 16 UNF | 1.25" | 0.500" | Medium motors, compressors, generators |
| Style C | 1" - 14 UNF | 1.50" | 0.625" | Large motors, industrial turbines |
| Style D | 1-1/4" - 11.5 NPT | 2.00" | 0.750" | Heavy-duty turbines, large generators |
| Parameter | RTD Version | Thermocouple Version |
|---|---|---|
| Sensing Element | Pt100, 3-wire, IEC 60751 Class B | Type K or J, ASTM E230 Std. Tolerance |
| Temperature Range | −50°C to 200°C | −50°C to 260°C |
| Lead Wire | 24 AWG, PTFE-insulated, 36" standard | 24 AWG TC extension wire, 36" standard |
| Body Material | Brass (standard) · 316 SS (optional) | |
| Spring Material | Stainless Steel 302 | |
| Operating Pressure | To 500 PSI with standard body | |
Captive compression spring maintains constant contact force between the sensing tip and bearing housing bore. Accommodates manufacturing tolerances in bore depth and ensures consistent thermal coupling over the operating life of the machine.
Suitable for both anti-friction (ball/roller) and fluid-film sleeve bearing housings. Sensing tip diameter and spring force selected to match housing bore geometry and expected measurement depth.
3-wire Pt100 configuration is compatible with all major DCS and PLC analog input modules without scaling. Thermocouple versions connect directly to any TC input card. Lead wire lengths customized for field routing.
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