The Stator winding temperature detector (RTD) are used to measure winding temperature of large Motors, Generators etc. These sensor are sandwiched between the windings of Motors/Generators.
Unlike on/off devices, It allows continuous measurement of winding temperature. The NEMA recognizes this kind of sensor as a standard protection for motor and generator Insulation.
Normally, these RTDs are of wire wound and sensing element extends through out the length of the detector. These feature will provide average temperature reading. Normally six sensors are recommended for each motor, Two per Phase. This RTD are generally flat type in construction and are available in various sizes.
Slim dimensions to get inserted in between windings
Bifiliar design that prevents induction voltage resulting in measurement errors
Resistance to shock, vibration and pressure
Withstand of VPI(Vacuum Pressure Impregnation) Process
High Dielectric Strength
ATEX /IECEx approve model available for equipment used in hazardous area
PT 100(100 ohm at 0°C)*
Fibre Glass epoxy
Class F(Temperature limit:155°C) or
Class H(Temperature limit:180°C)
3 KV 50/60 Hz for 1 minute between leads and surface of Glass epoxy
body (5 KV design are available on request)
Two or three or four
Single or multiple stranded with Tin/silver/Nickel plated copper wire
with teflon or Polyamide insulation (special Lead wire and cable upon
request). Please note that the selection of suitable wire gauge is
depend up on the width and thickness of the sensor.
For Sizes & all other dimension please refer drawing.
Note:Other values like PT-50,PT-200 and temperature coefficient of 0.003916 are available upon request. Custom design of sensors are also available upon request.
Accuracy of RTD element (A/B/2B)
Length in mm
Thickness in mm
Width in mm
Nos. of wires (option 2/3/4)
Lead length in mm
Wire Gauge of lead wires in AWG (option 22 to 28 AWG)
Lead wire Construction (See table I)
** Patent apply