I've used a few Pt100 RTDs over the years for gas flow temperature
control in the 200-300C range. At 0.385 ohms per K, the challenge of
managing the noise is a lot tougher than a cheapo NTC thermistor, but I
needed repeatability and stability.
http://www.farnell.com/datasheets/2278399.pdf
I use a 4-wire Kelvin connection, with 1 mA current drive. £14 at 10-off
Neil
On 05/04/2018 16:27, Dr. David Kirkby wrote:
Keysights nano volt / micro ohm meter takes
https://www.keysight.com/en/pd-1000001296%3Aepsg%3Apro-pn-34420A/micro-ohm-meter?cc=ZA&lc=eng
can do direct SPRT, RTD, Thermistor, and Thermocouple measurements
SPRT = Standard Platinum Resistance Thermometer
I don't claim to know much about this, but the uncertainty quoted for the
SPRT probes with that meter is 0.003 deg C.
When I Google SPRT probes, I see they are incredibly expensive - many
thousands of USD each.
I'm a bit puzzled there seem to be a number of 3-wire platinum resistance
thermometers. I can understand using 4-wires for a Kelvin connection, but
can't understand the use of 3-wires.
Of course, for environmental monitor in a lab, one is most unlikely to need
very high accuracy.
Dave
_______________________________________________
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
_______________________________________________
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
