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PRESYS
Instruments
3 - Safety Instructions
If the calibrator is turned on, do not leave the room without an identification or warning
about the high temperature hazard.
Before turning the calibrator off, return the block temperature to values close to the
ambient temperature.
When observing any liquid leakage, turn off the equipment and look for leakage
points. Please contact Presys Technical Support.
Never remove the insert from the dry block or the thermo-elements from the insert,
while they are in temperatures far from the ambient. Wait until they reach the ambient
temperature so that the heterogeneous cooling of the parts do not jam each other.
4 - Recommendations as regards Accuracy of Measurements
PRESYS Temperature Advanced Calibrators are instruments of high accuracy
level, requiring the observation of all the procedures described in this section, in order to
achieve the necessary conditions to get the accuracy levels during the calibrations.
Special attention should be paid in relation to the insert cleanliness. When necessary,
it should always be washed with water and soap, well rinsed and dried. Oil, grease,
solid particles can hinder the heat transference to the insert and even jam the insert
inside the block.
The sensor to be calibrated must fit snugly into the appropriate well. In case the
sensor is loose, the measurement accuracy meaning can be completely senseless.
The meaning of clearance between the sensor and the respective well should be
understood in a subjective way and the common sense is very important. Thus, the
sensor should enter the insert well (both completely clean) in such a way to stay
snugly enough so that it cannot move or swing inside but it should not enter by force
to get jammed.
To reach negative temperatures, it is necessary to use the thermal insulator shipped
with the insert, with the same drilling. The use of the insulation is dispensable in case
of positive temperatures.
In the specific case of generating negative temperature, the calibrations should be
performed in a descending temperature order. This procedure is useful because in
negative temperatures ice is formed in the insert surface and between the insert and
the thermo-element being calibrated. This humidity changes the thermal contact and
cause error in the calibration. After finishing the use of the insert below 0 C, increase
the set point to a positive temperature value, remove the insert from the block and the
sensor and dry completely all these parts before continuing the calibration. This
procedure guarantees accuracy next to 0.1 C. In case you can accept higher values
of accuracy, like 0.2 C or more, these cares can be left apart.
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TA-60NL
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