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Dial Type Thermometer 4031H

Dial type thermometers are designed to measure, Indicate and control the tem-perature of a specific applications, like Transformers oil , Generators, Bearing tem-perature monitoring etc…

Dial type thermometers are liquid filled in the closed system and DTT con-sists of Bulb assembly, capillary and Ex-pansion bellows. If the temperature chang-es, the internal pressure of the thermometer changes as well. The pressure is trans-ferred through capillary to a pointer shaft and thus the temperature values are indi-cated on scale.

OTI and BTD works without external power for its operation and indicates corre-sponding oil temperature on front panel.

WTI construction is also similar to OTI, in addition to that CT are provided to measure the winding temperature plus winding temperature above hot level, i.e the hot spot temperature.

WTI are provided with gradient ad-justment through a shunt for CT secondary

Hybrid Instrument

Hybrid Instruments are high performance temperature monitoring instrument with built in PT-100 sensor (RTD) & Current Converter Unit and external Remote In-dicator with Built in power Supply Unit.

Instrument casings are Aluminum die casted and PU coated for weather proof, All in-side and outside components are Brass and SS304.


  • 4.5 inch/115 mm Dial face for clear temperature indi-cation.
  • 2 no’s of adjustable switch-es for control and alarm’s.
  • Accuracy Range with in ±1.5% of full scale
  • IP-55 Protection
  • 60º Angular sweep with 2℃ each graduation
  • Panel Mounting option provided

Technical Specification

01Temperature Range0 to 150 (-10 to150Optional)ºC
02Angular Sweep60ºC
03Accuracy class± 1.5% of full scaleºC
04Dial Graduations2ºC
05Max. No of Switch2No’s
06Switch Rating5A @ 250V AC , 0.5A @ 220V DC
07Switch Differential5-10ºC
08SwitchNO type
09Switch Accuracy± 4ºC
10Max. Capillary LengthUpto 15Meters
11Degree of protectionIP-55
12High voltage test2.5kv AC, 50Hz/60Hz for 1 minute, all terminal to ground

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