Correcting The Zero Point; Maintenance / Service - Labom UNIVERSAL CA CA21 0 Series Operating Instructions

4.1

Correcting the Zero Point

You can correct the device's zero point (current at 0 bar) by using a permanent magnet,
such as one used for posting notices on a metal bulletin board. The magnet activates a
switch inside the device that triggers the zero point correction. The zero point can be ad-
justed by at most ±20%.
To set the zero point, proceed as follows. This adjustment procedure prevents an unin-
tended zero shift.
 Wait at least one second before positioning
the magnet near the device.
 Hold the magnet at the correction position as
indicated on the model plate for two to eight
seconds.
 Move the magnet away from the device for at
least one second.
After the last step has been completed, the currently applied pressure will be stored as the
zero point.
4.2

Maintenance / Service

When properly installed in accordance with applicable specifications, this device is
maintenance-free. However, we recommend an annual recalibration of the device.
In the event of any damage or defect the customer cannot replace or repair any compo-
nents or assemblies.
BA_059_2019-05_10.00 Pressure transmitter UNIVERSAL CA
Figure 3: Time sequence for correcting the zero point
Figure 2: Symbol indicating the correction
position on the type plate
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