Endress+Hauser Waterpilot FMX21 - Page 42

Commissioning Waterpilot FMX21
42 Endress+Hauser
Prerequisite:
The pressure values 0 mbar and 300 mbar (4.5 psi) can be specified. For example, the
device is already installed.
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 a pressureless condition. For information
on how to perform a position adjustment, see →  40.
Description
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.
i
p
A
B
A0017671
A See table, step 3.
B See table, step 4.
i Current value
p Meas.
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, 0 mbar for example.
Select the "Get LRV" parameter.
Menu path: Setup → Extended setup → Current
output → Get LRV
Confirm the present value by selecting "Apply".
The present pressure value is assigned to the
lower current value (4 mA).
4 The pressure for the URV (20 mA value) is
present at the device, 300 mbar (4.5 psi).
Select the "Get URV" parameter.
Menu path: Setup → Extended setup → Current
output → Get URV
Confirm the present value by selecting "Apply".
The present pressure value is assigned to the
upper current value (20 mA).
5 Result:
The measuring range is configured for
0 to +300 mbar (0 to 4.5 psi).
9.9.2 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 is assigned to the 4 mA value
and 300 mbar (4.5 psi) is assigned to 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 a pressureless condition. For information
on how to perform a position adjustment, see →  40.