Temperature measurement with DMM
Temperature measurement with DMM
(OP)
Looking to inexpensively monitor temperature variations without much concern for actual temperature. Ranges around 150C. Would a Thermopile with 500mA output connect directly to a DMM ? Or is there another way. Cold junction would be possible --Ice water or? As you can see Electrical not my fortee





RE: Temperature measurement with DMM
If you have power available (2 or 3 volts), use a silicon temp. sensor chip (LM34, see National Semiconductor site, www.national.com). Accuracy can get as good as +/-.5 deg. F.
Cheaper, but less accurate are thermistors - read them directly with an ohm meter; these are good to +/- 1 or 2 deg. C when calibrated, or used as differential sensors.
Cheapest: you can read a thermocouple directly in mV with a DMM, effectively measuring the temp. difference from the meter to the probe end.
RE: Temperature measurement with DMM
Fluke, of course, have temperature probes that can be connected to any DMM. Not only theirs. They also have a non-contact surface temperature transducer.
Google +DMM +temperature for a long list.
If you want to experiment, you can always use a thermistor and a couple of resistors to have a limited linear range. http:/
Gunnar Englund
www.gke.org
RE: Temperature measurement with DMM
All the above suggestions are fine.. They just require a heck of a lot of mucking around and table look ups, with the exception of the National part. Which all increase the chance of a screw up. I have used all the above methods with various success.
Lay hands on a non-contact temperature measurer. One of those point-the-laser-spot-read-the-temp guns.
The temp gun sees the light of warm objects, so as you use it imagine everything giving off light that signifies it's temp, and use the gun appropriately.
I use mine to check the temperature of my aquarium, the chili I was cooking yesterday, room temperature, my oven temperature. You can use them to find which cylinder is missfiring. The one with the 20F colder header pipe....
I use mine just about every day! I use it on motors, vacuum pumps, refrigerators, IC's. Just a whole lot of things. You can measure spots that any other measurement method works poorly on. Surface temperature of a motor is a good example. If you want the temp of a motor that isn't instrumented internally the temp gun is great.
Here are a bunch under a hundred bucks.
htt
htt
htt
htt
RE: Temperature measurement with DMM
RE: Temperature measurement with DMM
http
http:
http:
h
itsmoked
When you copy someone's post from another board (http://www.clubhotrod.com/t13354.html) make sure you expand the links rather than copy&paste
Good Luck
johnwm
________________________________________________________
To get the best from these forums read FAQ731-376 before posting
UK steam enthusiasts: www.essexsteam.co.uk
RE: Temperature measurement with DMM
Thanks for hunting up the correct ones.
That took some sluicing to hunt that back to my original post.
RE: Temperature measurement with DMM
Good Luck
johnwm
________________________________________________________
To get the best from these forums read FAQ731-376 before posting
UK steam enthusiasts: www.essexsteam.co.uk