SENSOR

Steven Spencer1

Other Parts Discussed in Thread: TMP75

I need help with figuring out for the TMP75/175AIDR what the RH value maximum is for humidity. I am operating at 70%-90% RH. Is it okay to use potting material to insulate the pins and the chip or will it degrade the accuracy?

over 4 years ago

0 Ren Schackmann over 4 years ago

TI__Mastermind 35855 points

Hi Steven,

I don't believe we have any specific guidelines for the temperature sensing products regarding RH exposure. Are you concerned about corrosion?

Potting material will change the thermal performance, but it's hard to say if the change would be a boon or a hindrance in your application. If you're trying to measure the temperature of a specific location or object, potting material may improve thermal conduction between the sensor and the object of interest. If you're trying to measure ambient air temperature, then any additional thermal path or thermal insulation will likely worsen the thermal performance.

Thanks,

Ren

0 Steven Spencer1 over 4 years ago in reply to Ren Schackmann

Prodigy 40 points

This sensor will be sitting on top of a heat sink. The worry I have is the effective vomtage mesured due to the humidity. Typical applications I have used this in humidity was not an issue. I just need to know if humidity will cause acvuracy issues or if potting will?

0 Ren Schackmann over 4 years ago in reply to Steven Spencer1

TI__Mastermind 35855 points

Hi Steven,

Humidity will not affect temperature accuracy.

Thanks,

Ren

0 Steven Spencer1 over 4 years ago in reply to Ren Schackmann

Prodigy 40 points

Will this device be okay to have potting material on it or will that cause degridation of the accuracy or another issue?

0 Ren Schackmann over 4 years ago in reply to Steven Spencer1

TI__Mastermind 35855 points

Hi Steven,

I don't expect the device itself to be altered by potting material. Adding thermal mass to the system will have some effect on system thermal performance regardless of the sensor used.

Thanks,

Ren