Endress+Hauser Waterpilot FMX21, Operating Instructions Manual

Page: 46 / 144

Commissioning Waterpilot FMX21
46 Hauser
4. The pressure for the URV (20 mA value) is present at the device, here
300 mbar (4.5 psi) for example. Select the "Get URV" parameter. Confirm the value
present at the device by selecting "Apply". The pressure value present at the device is
assigned to the upper current value (20 mA).
 Menu path: Setup → Extended setup → Current output → Get URV
The measuring range is configured for 0 to +300 mbar (0 to 4.5 psi).
9.8.2 Calibration without reference pressure (dry 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:
This is a theoretical calibration, i.e. the pressure values for the lower and upper range are
known.
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. Select the "Set LRV" parameter. Enter the value for the "Set LRV" parameter (here
0 mbar) and confirm. This pressure value is assigned to the lower current value
(4 mA).
 Menu path: Setup → Extended setup → Current output → Set LRV