A leading manufacturer of valves, pumps and manifolds― Takasago Electric, Inc.

The method for measuring a coil temperature rise: 
Since the value of a coil temperature rise is easily effected by ambient temperature, measuring temperature on the surface of a coil cannot yield any accurate measurements. Thus, the mean temperature is determined by the resistance method using the temperature coefficient of resistance of copper.

R₁: initial resistance
R₂: final resistance after energization
T₁: initial ambient temperature
T₂: coil temperature rise
ΔT: change in ambient temperature from the beginning to the termination of energization
When the ambient temperature rises, ΔT is subtracted. When the ambient temperature falls, ΔT is added.

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