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5. Commissioning, operation
Temperature checks using thermometers with probes assembled with thermowells can,
in many cases, only result in a reference temperature at the test item, due to permanent
heat dissipation caused by the thermowell.
In temperature areas fitted with static checking thermometers (e.g. pipeline systems),
permanent deviations in reference temperatures can also be caused by the measuring
path. Ambient temperatures around the indicator case which differ substantially
from room temperature can lead to steady indication errors with constant ambient
temperatures and to varying indication errors with fluctuating ambient temperatures.
5.8
Indication correction
A zero point adjustment may only be carried out by the manufacturer.
The electrical connection must only be made by qualified skilled personnel.
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Connecting the switch via cable socket
■
Conductor cross-section max. 1.5 mm²
■
The pin assignment is stated on the connection label of the thermometer
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5.9
Adjusting the set pointer (with microswitch)
The adjustment of the set points is achieved using the adjustment key in the window.
By pressing and turning the adjustment button, the set pointers are carried along
and moved to the set point with the help of the adjustment pointer attached to the
adjustment lock.
The set pointers for the microswitches are freely adjustable over the full scale range.
For reasons of switching accuracy and the service life of the mechanical measuring
systems, the switch points should be between 10 % and 90 % of the measuring span.
As a result of surface oxidation on the contact surfaces, especially with intrinsically safe
switching (small voltages and low currents), flaws that can lead to contact erosion can
arise as a result of the developed isolation resistance and with higher contact loads.
Operating instructions for expansion thermometer, CEDASPE
Adjustment
button
VT series
®
EN
15
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