Endress+Hauser Waterpilot FMX21, Operating Instructions Manual

Page: 49 / 144

Waterpilot FMX21 Commissioning
Hauser 49
8. Enter the volume value for the upper calibration point via the "Full calib." parameter,
here 1 000 l (264 gal) for example.
 Menu path: Setup → Extended setup → Level → Full calib.
9. Enter the pressure value for the upper calibration point via the "Full pressure"
parameter, here 400 mbar (6 psi) for example.
 Menu path: Setup → Extended setup → Level → Full pressure
10. "Adjust density" contains the factory setting 1.0 but can be changed if required. The
value pairs subsequently entered must correspond to this density
 Menu path: Setup → Extended setup → Level → Adjust density
11. Set the volume value for the lower current value (4 mA) via the "Set LRV" parameter
(0 l).
 Menu path: Setup → Extended setup → Current output → Set LRV
12. Set the volume value for the upper current value (20 mA) via the "Set URV" parameter
(1 000 l (264 gal)).
 Menu path: Setup → Extended setup → Current output → Set URV
13. 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 → Density → Process
14. If density correction is required, assign the temperature probe in the "Auto dens. corr."
parameter. 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 10)
and "Process density" (step 13) parameters are not used here.
 Menu path: Expert → Application → Auto dens. corr.
The measuring range is configured for 0 to 1 000 l (0 to 264 gal).
For this level mode, the measured variables %, level, volume and mass are available,
see "Output unit" →  96.
9.9.4 "In pressure" level selection Calibration with reference
pressure (wet calibration)
Example:
In this example, the level in a tank should be measured in "m". The maximum level is
3 m (9.8 ft).
The pressure range is derived from the level and the density of the medium. In this
situation, the device sets the pressure range to 0 to +300 mbar (0 to 4.5 psi).
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
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.