Endress+Hauser Waterpilot FMX21, Operating Instructions Manual

Page: 56 / 144

Commissioning Waterpilot FMX21
56 Hauser
20%
25%
1.
2.
20%
A0018841
1 See step 2
2 See step 3
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.
2. Set the value for "Empty calib." with the differential pressure for the level, e.g. 20 %
 Menu path: Setup → Extended setup → Level → Empty calib.
3. Set the value for "Full calib." with the differential pressure for the level, e.g. 25 %
 Menu path: Setup → Extended setup → Level → Full calib.
4. The values for the pressure when the vessel is full or empty are measured
automatically during adjustment. As the transmitter automatically sets the pressure
values that are best suited for an "Empty calibration" and a "Full calibration" to the
minimum and maximum pressure that triggers the output current, the correct upper
range value (URV) and lower range value (LRV) must be set.
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. In this
case, you have to enter the various densities via the following menu path:
• Setup → Extended setup → Level → Adjust density (034) (e.g. 1.0 kg/l1.0 kg/l for
water)
• Setup → Extended setup → Level → Process density (035) (e.g. 0.8 kg/l for oil)
9.9.8 Level measurement with absolute pressure probe and external
pressure signal (electrical differential pressure)
Example:
In this example, a Waterpilot FMX21 and a Cerabar M (each with an absolute pressure
measuring cell) are connected via the common communication bus. The level can thus be
measured in a deep well, with simultaneous compensation for the effect of atmospheric
pressure.