WIKA DI35 - Manual (Page 33)

6 Commissoning, operation
WIKA operating instructions digital indicator model DI35-M 33
PN5: Offset shift / Zero point shift
With this parameter it is possible to carry out a parallel shift of the
parameterized characteristic line. This may be necessary if, for example, a
pressure sensor ages over the course of time and a shift in the zero point
occurs. With the parallel shift, the sensor can be adjusted back to the zero
point. Another application would be to parameterize a certain tank level to
zero and have any deviation from this level displayed.
With the offset it does not matter whether the original characteristic line has
been programmed by the user with PN1, PN2 or PN101...130 or whether it is
the characteristic line of a temperature sensor. The value parameterized
under PN5 is added to the original display value.
Example:
If, for example, a temperature sensor shows approx. 3°C
instead of 0°C, you can compensate for this deviation by
changing the value under PN 5 from 0 to ‑3.
If the comparison metering point is turned off for the thermocouple, the
comparison metering temperature can be preset manually. This parameter
can be changed directly by taring, if it has been actuated by a configurated
incident (see PN8).
PN6: Thermocouple reference junction
The thermocouple reference junction is only available for thermocouples and
can be activated or deactivated under PN6. Deactivation may be useful
where the interchange point is kept at a very constant level or the
temperature constitutes the direct relationship to the process. In this case the
wiring to the measuring device can be conducted in simple wiring copper.
PN7: Setpoint value for taring
By actuation of the taring, the display value is set on the taring value. This
means the offset / zero point is shifted in a way that the display value is
equivalent to the taring value.
PN8: Actuation for taring
During taring, the instantaneaus value is set on a demanded setpoint value,
which is configurated under PN7. The difference between setpoint value and
actual value is safed as Offset PN5 in the device.
The following operating modes, which are adjustable at PN8, are available: