Endress+Hauser Waterpilot FMX21, Operating Instructions Manual

Page: 45 / 144

Waterpilot FMX21 Commissioning
Hauser 45
9.8 Configuring pressure measurement
9.8.1 Calibration with reference pressure (wet calibration)
Example:
In this example, a device with a 400 mbar (6 psi) sensor module is configured for the
0 to +300 mbar (0 to 4.5 psi) measuring range, i.e. 0 mbar and 300 mbar (4.5 psi) are
assigned, respectively, to the 4 mA value and the 20 mA value.
Prerequisite:
The pressure values 0 mbar and 300 mbar (4.5 psi) can be specified. The device is already
mounted, for example.
Due to the orientation of the device, there may be pressure shifts in the measured
value, i.e. the measured value is not zero in an unpressurized state. For information
on how to perform position adjustment, see →  43.
p
[mbar]
20
B
4
A
0 300
I
[mA]
A0031032
A See step 3
B See step 4
1. Select the "Pressure" measuring mode via the "Measuring mode" parameter.
 Menu path: Setup → Measuring mode
L
WARNING
Changing the measuring mode affects the span (URV)
This situation can result in product overflow.
‣
If the measuring mode is changed, the setting for the span (URV) must be checked in
the "Setup" operating menu and readjusted if necessary.
2. Select a pressure unit via the "Press. eng. unit" parameter, here "mbar" for example.
 Menu path: Setup → Press. eng. unit
3. The pressure for the LRV (4 mA value) is present at the device, here 0 mbar for
example. Select the "Get LRV" parameter. Confirm the value present at the device by
selecting "Apply". The pressure value present at the device is assigned to the lower
current value (4 mA).
 Menu path: Setup → Extended setup → Current output → Get LRV