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Dial Type Thermometer 4007

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

Dial type thermometers are liquid filled in the closed system and DTT consists of Bulb assembly, capillary and Expansion bellows. If the temperature changes, the internal pressure of the thermometer changes as well. The pressure is transferred through capillary to a pointer shaft and thus the temperature values are indicated on scale.

OTI and BTD works without external power for its operation and indicates corresponding 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 adjustment through a shunt for CT secondary input (1A to 5A)


  • 4.5 inch/115 mm Segmental Dial face for clear temperature indication.
  • 4 no’s of adjustable switches 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
  • Instrument casings are Aluminum die casted and PU coated for weather proof, All inside and outside components are Brass and SS304.

Technical Specification

01Temperature Range0 to 150 (-10 to150 Optional)ºC
02Angular Sweep60ºC
03Accuracy class± 1.5% of full scaleºC
04Dial Graduations2ºC
05Max. No of Switch4No’s
06Switch Rating15A @ 250V AC , 0.5A @ 220V DC
07Switch DifferentialS1 & S2 : 5-10ºC
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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