Endress+Hauser Deltabar FMD72, Operating Instructions Manual

Page: 52 / 108

Commissioning Deltabar FMD72
52
11.7.6 "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
1000 liters (264 gal) corresponds to a level of 4.5 m (15 ft). The minimum volume of 0 liters
corresponds to a level of 0.5 m (1.6 ft) since the device is mounted below 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. Further limit values are not checked, i.e. the values entered must
be appropriate for the sensor module 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 container is empty or partly filled, the measured value is not zero. For information on how to
perform position adjustment, see (
®
ä 44).
Description
1 Select the "Level" measuring mode via the
"Measuring mode (005)" parameter.
Menu path: Setup
®
Measuring Mode
0 L
1000 L
4.5 m
0.5 m
1
2
3
r
= 1
g
cm
A0017667
1 See table, steps 7 and 8.
2 See table, steps 9 and 10.
2 Select a pressure engineering unit via the "Press Eng.
Unit (125)" parameter, here "mbar" for example.
Menu path: Setup
®
Press Eng. Unit
3 Select the "In height" level mode via the "Level
selection (024)" parameter.
Menu path: Setup
®
Extended Setup
®
Level
®
Level Selection.
4 Select a volume unit via the "Unit before lin. (025)"
parameter, here "l" (liters) for example.
Menu path: Setup
® Extended Setup ® Level ®
Unit Before Lin.