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High sensitivity rapid response themistor

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mick66

New Member
Hi guys

I need to build a air temperature sensor. I have the basic circuit worked out ... its just a wheatstome bridge. Trouble is that I need to find a suitable thermistor. I'm a bit of a newbie so sorry if I get some of the terms wrong.

It needs to be pretty sensitive ... sensitive to pick up say ay .1 degree change in temperature.

It also needs to have a low thermal time constant as I need it to respond in approx 3 to 5 seconds ... I've seen some but their thermal time constants are around 15 to 30 seconds which is way to slow.

It also needs to respond to air temperature rather than raditaion ... although I guess I could 'grind' off the glass on the glass bead evacuated types.

I'm told it will also need a high resistance such as 2MΩ in order to reduce current. A high current can cause the thermistor to heat up and any passing air can cool it down giving a false indication.

Any ideas?

Cheers

Mike
 

Boncuk

New Member
Check that one: SHT11.

It measures temperature and relative humidity.

16bit A/D converter and serial interface are integrated. Response time 5 to 30 seconds.

Boncuk
 

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MikeMl

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Most Helpful Member
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