Endress+Hauser Cerabar M, Руководство по эксплуатации

Страница: 57 / 92

Cerabar M, Deltapilot M Commissioning
Hauser 57
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.
A
20 %
B
25 %
20 %
A0030031
A See table, step 2
B See table, step 3
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 dur-
ing 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.
8.6 Configuring pressure measurement
8.6.1 Calibration without reference pressure (dry calibration)
Example:
In this example, a device with a 400 mbar (6 psi) sensor is configured for the
0 to +300 mbar (0 to 4.5 psi) measuring range, i.e. the 4 mA value and 20 mA value are
assigned 0 mbar and 300 mbar (4.5 psi) respectively.
Prerequisite:
This is a theoretical calibration, i.e. the pressure values for the lower and upper range are
known.
Due to the orientation of the device, there may be pressure shifts in the measured
value, i.e. the measured value is not zero in an unpressurized condition. For informa-
tion on how to perform position adjustment, see →  52.