Calibration with partially
filled vessel
If the following calibration is initially carried out with a hydrostatic pressure sensor using
water (ρ = 1.0), density can be measured and read off from V8H7.
• If the product changes, the system can be quickly adapted to the new
product by entering a its density at V8H7. This ensures that the correct level is
measured as the vessel is filled.
Sensor calibration
Liquiphant limit switch +
level probe
# Matrix Entry Remarks
1 V9H5 Reset, enter probe
V3H5/V3H6 constants, page 23
2 V8H0 5 Calibration correction
3 - »E« Register entry
4 V8H2 e.g. 2 s Switching delay
5 - »E« Register entry
6 V8H3 e.g. 75% Installation height
7 - »E« Register entry
8 V8H4 0 Sensor = Liquiphant
9 - »E« Register entry
Level calibration
# Matrix Entry Remarks
10 V8H7 1 At »empty« level,
set corr. factor to 1
11 - »E« Register entry
12 V0H1 e.g. 10% »Empty« level
13 - »E« Register entry
14 V8H7 1 At »full« level
set corr. factor to 1
15 - »E« Register entry
16 V0H2 e.g. 90% »Full« level
17 - »E« Register entry
Note!
• The best accuracy is attained when the
difference between »full« and »empty«
levels is as great as possible.
• If the operating mode is temporarily
quit, the Prolevel measures by using
the sensitivity V3H2 x V8H3. The
indication remains correct as long as
the same product is in the tank.
Next step…•If appropriate, linearisation, p. 25…27
• Analogue output and relays, p. 30…33
— assign relays 2a/2b to channel 1.
100%
installation
height
measuring range
e.g. 75%
»Empty« e.g. 10%
0%
Note!
V0H1, V8H7
V0H2, V8H7
BA142_46
»Full« e.g. 90%
0%
measuring range
Fig. 5.4:
Parameters for calibration with partially filled vessel
Chapter 5: Level Measurement with Limit Switch Prolevel FMC 661
38 Endress+Hauser
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