Technical data

Making Measurements 3
U1401A User’s and Service Guide 51
Measuring Temperature
The bead type thermocouple probe is suitable for measuring
temperature from –40 °C to 204 °C in PTFE compatible
environments. Above this temperature range, probes may
emit toxic gas. Do not immerse the thermocouple probe in
any liquid. For best results, use a thermocouple probe
designed for each specific application — an immersion probe
for liquid or gel, and an air probe for air measurements.
Observe the following measurement techniques:
• Clean the surface to be measured and make sure that the
probe is securely touching the surface. Remember to
disable the applied power.
• When measuring above the ambient temperature, move the
thermocouple along the surface until you get the highest
temperature reading.
• When measuring below the ambient temperature, move the
thermocouple along the surface until you get the lowest
temperature reading.
• Always set the slide switch to the M position (meter
operation only). Place the instrument in the operating
environment for at least one hour as the instrument is
using a non- compensation transfer adapter with miniature
thermal probe. If you are using the type of thermocouple
probe where the thermal wires penetrate into the banana
or lantern terminals, you only need to place the
instrument in the operating environment for at least 15
minutes.
• For quick measurements, use the 0 °C compensation to
observe the temperature variation of the thermocouple
sensor. The 0 °C compensation makes it possible for you
to measure the relative temperature immediately.
CAUTION
Do not bend the thermocouple leads at sharp angles. Repeated bending
over a period of time may break the leads.