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PRESYS
Instruments
9 .0 - Tiny Steel Balls (Optional), Recommendations of Use
As an optional, the dry block calibrators offers a plastic container with tiny steel balls
and a cup-like insert. This item are exclusive accessories of PRESYS dry block calibrators,
which is 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:
Every care must be taken when using the mug insert and steel balls. Only place or
remove the balls or sensors when at room temperature. Operate the bath in an appropriate
place where it is not possible for the bath to fall or tip over so that the spheres at high
temperature can fall out and cause burns or other damage.
Page 22
TE -25N / TE-35N / TE-50N
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