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Choosing a temperature sensor can often be very straightforward, sometimes tricky,
but always worth doing well. That's because these sensors, especially in science
and engineering uses, can spell the difference between repeatable results and
nonsense numbers. The name of the game in measurement is to measure with an amount
of inaccuracy or uncertainty that is acceptable. So, the first thing you need
to know is how well you need to know the value of the temperature numbers you
expect to get. A simple series of questions, when answered, will usually get you
started.
- What
is the desired temperature range, the tolerable limit to the error in measurement
and the conditions under which the measurement is to be performed?
- Is it possible
to touch the object and if so would the sensor or the temperature of the object
be likely to be seriously affected by the contact?
If the answer is yes, then
a non-contact temperature sensor is needed.
If no, then the answer probably
lies with one of the other sensor types.
- If
a contact sensor appears satisfactory, then questions revolve more around temperature
measuring range, satisfying the conditions of use and meeting the acceptable error
allowance.
Sensor
Scientific's web site has comparison of four popular contact temperature sensor
types , Thermocouples, Resistance, Thermistors and Semiconductor, shown on a one
page chart and in a very readable
article.
If you've got sensors you would like to have listed or linked, a good application
story, a new sensor, a training course, calibration service, know of an Internet-
accessible data base or other input you believe valuable, send an email. If it
meets some simple norms of good taste and utility, it will be added to the site
for the benefit of others. Email to: <img src="emailaddr.gif">.
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