Endress+Hauser Waterpilot FMX21 - Page 48

Commissioning Waterpilot FMX21
48 Endress+Hauser
Description
12 If the process uses a medium other than that
on which the calibration was based, the new
density must be specified in the "Process
density" parameter.
Menu path: Setup → Extended setup → Level →
Process density.

The process density can be changed only
if automatic density correction is
switched off (see step 5).
13 Result:
The measuring range is configured for
0 to 3 m (0 to 9.8 ft).
For this level mode, the measured variables %, level, volume and mass are available,
see "Unit before lin." .
9.10.5 "In height" level selection Calibration without reference
pressure (dry 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.
Prerequisite:
• The measured variable is in direct proportion to the pressure.
• This is a theoretical calibration i.e. the height and volume values for the lower and upper
calibration point must be known.
• The values entered for "Empty calib./Full calib.", "Empty height/Full height" and" Set
LRV/Set URV" 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.
• Due to the orientation of the device, there may be pressure shifts in the measured
value, i.e. when the vessel is empty or partly filled, the measured value is not zero.
For information on how to perform a position adjustment, see →  40.
Description
1 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.
1000 l
0 l
4 m
r = 1
g
cm
3
A0018827
2 Select a pressure unit via the "Press. eng. unit"
parameter, here "mbar" for example.
Menu path: Setup → Press. eng. unit