Information

20
Suggested test tools
Temperature Switch and
Controller Testing at the Bench
A temperature switch is a device that protects
a thermal system by sensing temperature and
closing or opening a switch to shut down a
process or equipment if the temperature is
outside the safe range.
Temperature switches are often calibrated or
tested for safety reasons to determine how
accurate and repeatable the device is. The
temperature at which a switch activates is called
the set point and is an important value that needs
to be verified during testing.
Another critical safety related value is called the
deadband. Below the low end of the deadband,
the heating system turns on. Above the high end
of the deadband, the heating system turns off.
Switch tests may be operated manually or
automatically. If the electronics are not built
into the dry-well for a switch test, then a
DMM will be needed to determine the open/
close condition. Metrology Wells and most
Field Metrology Wells have built-in routines to
automate switch testing.
9142, 9143, 9144 Field Metrology Wells
See pg 34
6102 Micro-Bath
Thermometer Calibrator
See pg 32
7103 Micro-Bath
Thermometer Calibrator
See pg 32