Endress+Hauser Proservo NMS83 Operating Instructions Manual page 85

Proservo NMS83
Endress+Hauser
Setting for an open tank without liquid
If there is no liquid in the tank, the following procedure can be used to set the tank bottom
or datum plate to 0 mm for the tank level.
Level setting procedure
1. Navigate to: Operation → Gauge command → Gauge command
2. Select the Bottom level option to measure the tank bottom.
3. Navigate to: Operation → One-time command status
4. Wait until the Finished option is shown.
5. Navigate to: Operation → Level → Bottom level
6. Read the bottom value (Bv).
7. Navigate to: Setup → Empty
8. Read the actual empty value (Ea).
9. Calculate the new empty value using following formula.
 En = Ea - Bv - Z0
10. Input the calculated value for the Empty parameter.

• The parameter Z0 defines the distance between the desired 0mm level value and
the physical tank bottom (if displacer measures the datum plate, Z0 = 0 mm (0 in)).
• Bottom level operation considers the immersion depth of the displacer in the
measurement.
This completes the level setting for open tank without liquid procedure.
 42 Open tank without liquid
1 Tank bottom
2 Datum plate
Ea Initial empty setting
Bv Initial bottom level
En New empty
Z0 Distance from tank bottom to datum plate
It is recommended to repeating the level calibration when there is liquid in the tank
(→  84).
Example: Ea = 28m, Bv = 10.5m, Z0 = 0.5m
En = 28m - 10.5m = 17m
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Commissioning
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