Electronics Weekly
“Oil cooling is anticipated to become the dominant temperature management method in the electric drivetrain of EVs,” it said.
Called B58101A0851A000, and is designed to push into the oil cavity from the outside through a hole. From end to end it measures ~43mm and it is “highly resistant to ZF EcoFluid E gear oil for electric drive systems”, according to TDK.
Once installed, the sensor tip is inside, the connections are outside, and integrated O-rings prevent oil escaping.
Operation is across -40 to +150°C, and is can be exposed to up to 10bar of pressure (a retention tab is provided for adding mechanical restraint.
At the rated temperature of 70°C resistance is 876Ω ±1%, and the 25/100 ‘B’ value is 3988 ±1% (resistance at 25°C is 5kΩ, and the R/T curve number is 8016/A1).
Accuracy between -40 and +125°C is better than ±1%, and the time constant, measured in water, is under 4s.
If this information is insufficient, the data sheet includes nominal, max and min values every 5°C over the operating range.
Other resistance-temperature curves can be provided, as can other mounting configurations.
