Endress+Hauser Waterpilot FMX21 - Page 51

Waterpilot FMX21 Commissioning
Endress+Hauser 51
9.10.6 "In height" level selection Calibration with reference pressure
(wet calibration)
Example:
In this example, the volume in a tank should be measured in liters. The maximum volume
of 1 000 l (264 gal) corresponds to a level of 4 m (13 ft).
The minimum volume of 0 liter corresponds to a level of 0 m since the process isolating
diaphragm of the probe is at the start of the level measuring range. The density of the
fluid is 1 g/cm
3
(1 SGU).
Prerequisite:
• The measured variable is in direct proportion to the pressure.
• The tank can be filled and emptied.
The values entered for "Empty calib./Full calib." and" Set LRV/Set URV" and the
pressures present must be at least 1% apart. The value will be rejected, and a warning
message displayed, if the values are too close together. Other limit values are not
checked, i.e. the values entered must be appropriate for the sensor and the measuring
task for the device to be able to measure correctly.
Description
1 Perform a "position adjustment" →  40.
1000 l
0 l
4 m
r = 1
g
cm
3
A0018827
1 See table, step 9.
2 See table, step 10.
3 See table, step 11.
2 Select the "Level" 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.
3 Select the "In height" level mode via the "Level
selection" parameter.
Menu path: Setup → Extended setup → Level →
Level selection.
4 If density correction is required, assign the
temperature probe in the "Auto dens. corr."
parameter.
Menu path: Expertc → Application → Auto
dens. corr.
A density correction is only possible for water.
A temperature-density curve that is saved in
the device is used. For this reason, the "Adjust
density" (step 11) and "Process density" (step
14) parameters are not used here.
5 Select a pressure unit via the "Press. eng. unit"
parameter, here "mbar" for example.
Menu path: Setup → Press. eng. unit