Tiny Steel Balls, Recommendations Of Use And Safety Instructions - Presys T-350P Technical Manual

PRESYS
 Instruments
10 - Tiny Steel Balls, Recommendations of Use and Safety
Instructions
The dry block calibrators are offered including a plastic container with tiny steel
balls.
This item is an exclusive accessory of PRESYS dry block calibrators, which also
provide a cup-like insert that is an insert drilled with the maximum allowed diameter
(3/4"), proper for being filled with the tiny balls.
With both the cup-like insert and the tiny balls, it is possible to calibrate
temperature sensors with irregular shape or whose dimensions do not match the
available insert holes. One should place the sensor to be calibrated in the insert and
fulfill the remaining volume with the tiny balls.
It is important to note that accuracy gets worse in this kind of procedure because
the dry block is calibrated in factory using an insert with an appropriate well that fits the
standard sensor snugly. Thus, the accuracy specifications presented in this manual are
not valid any more. Anyway, consider an increase of up to five times the accuracy
values.
To use the tiny balls and continue achieving accurate measurements it is
necessary to read from an external reference sensor tied together with the sensor to be
calibrated both plunged in the tiny balls. In order to join the sensors, one can use rigid
copper wire. Wind them with several turns starting from the tip of the sensors. For a
reference thermometer it is suggested PRESYS Super Thermometer ST-501.
Safety Instructions:
Take care when using the cup-like insert and the tiny balls of steel. Handle the
balls or the sensors only when they are at ambient temperature. Operate the dry block
calibrator in a proper location to prevent it from falling down or even to prevent the balls
at high temperature from being spilled outside causing body burn or other damages or
injuries.
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T-350 P / T-650 P