Endress+Hauser Liquicap M FMI51 HART - Function Switch: Position 3. Carry out Full Calibration - for Full Tanks; Function Switch: Position 3. Carry out Full Calibration - for Almost Full Tanks

Liquicap M FMI51 HART Commissioning
Endress+Hauser 41
The lower current value can be adjusted with the  and  keys.
The following must also be considered:
• the lower current value means that the tank is empty, 0 % is 4 mA.
• the upper current value means that the tank is full, 100 % is 20 mA.
• this results in a measuring range of 16 mA for a change from 0 to 100 %. For example
0.16 mA increase in the current for every 1 % increase in the level.
• for a 15 % level, this is 15 % × 0.16 mA per % which equals the 2.4 mA. This must be
added to 4 mA to obtain the current value to be set: 2.4 mA + 4 mA = 6.4 mA.
To perform empty tank calibration on a partially filled tank:
1. Turn the function switch to position 2.
2.
Press the  or  keys for 2 s.
3. Set the desired current value (>4 mA) using the multimeter connected.
4. Release the key.
 Empty calibration is saved.
7.2.4 Function switch: position 3. Carry out full calibration - for full
tanks
If the tank is full (100 %), the full calibration sets the signal current to the upper value of
20 mA. When empty calibration is completed, the current value of 20 mA is displayed at
the ammeter.
To perform full tank calibration:
1. Turn the function switch to position 3.
2.
Press the  and  keys together for 2 s until the green or red LED flashes.
3. Release the two keys again.
4. The flashing stops after 10 s.
 Empty calibration is saved.
7.2.5 Function switch: position 3. Carry out full calibration - for
almost full tanks
If possible, the exact level of the tank should be known and should be as large as possible
(> 70 %).
Too low level reduces the accuracy of the upper point which corresponds to the full tank.
An ammeter must be connected to the current pick-off at the electronic insert.
For example, the level was determined for 90 %, the electric current value that
corresponds to the level of 90 % must be determined. The upper current value can be
adjusted with the  and  keys. The  key increases the value, the  key reduces the
value.
The following must also be considered:
• the lower current value means that the tank is empty, 0 % is 4 mA.
• the upper current value means that the tank is full, 100 % is 20 mA.
• this results in a measuring range of 16 mA for a change from 0 to 100 %. For example
0.16 mA increase in the current for every 1 % increase in the level.
• for a 90 % level, this is 90 % × 0.16 mA per % which equals the 14.4 mA. This must be
added to the 4 mA to obtain the current value to be set: 4 mA + 14.4 mA = 18.4 mA. It
is possible to take the upper current value and then subtract 10 % x 0.16 mA per %
which equals 1.6 mA from 20 mA.
To perform full calibration on a partially filled tank:
1. Turn the function switch to position 3.