Deltabar FMD71, FMD72 Commissioning
Endress+Hauser 51
9.10.4 "In pressure" 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 pressure of 450 mbar (6.53 psi).
The minimum volume of 0 liters corresponds to a pressure of 50 mbar (0.73 psi) 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 pressure and volume values for the lower and
upper calibration point must be known.
• The values entered for "Empty calib./Full calib.", "Empty pressure/Full pressure" 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 vessel is empty or partly filled, the measured value is not zero.
For information on how to perform position adjustment, see → 81.
Description
1 Select the "Level" measuring mode via the
"Measuring mode (005)" parameter.
Menu path: Setup → Measuring mode
A0017661
A See table, steps 6 and 7.
B See table, steps 8 and 9.
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 pressure" 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.
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