4.2 Calibration
This section describes three methods of calibration which require the tank or silo to be
filled and the entry of:
• an »empty« level at V0H1 and
• a »full« level at V0H2.
The fourth method can be used to make a »dry« calibration for hydrostatic sensors. For
horizontal cylinders and tanks with conical outlet, users requiring a volume or weight
measurement can activate the linearisation procedure.
Note!
• Prolevel is not bound to specific level units: during calibration it merely assigns the
numbers entered to the measured frequencies for »empty« and »full«.
1) Standard calibration
for upright cylinders
# Matrix Entry Remarks
1V0H1
E
Tank empty, current
level in your units
2 - »E« Register entry
3V0H2
F
Tank full, current
level in your units
4 - »E« Register entry
5 V0H0 Level Measured value in
the units selected.
Note!
• The calibration can be performed in
reverse order.
• For bulk solids (capacitance probes!),
the probe measures the depth of
emersion in the product only. Account
for any filling mound or outflow
depression by the entered levels.
• Density correction, see p. 29.
After calibration If the product level is entered in %:
• % level is displayed at V0H0
• the 0/4…20 mA signal range
corresponds to 0…100% level
• relays 1a and 1b switch at 90% in
maximum fail-safe mode.
Next step… If the level is entered in length, volume or
weight units, the analogue output and
relays must be set, see p. 30…33.
Note!
V0H1
V0H2
»Empty« level E
(0…40%)
Deltapilot
capacitance probe
»Full« level F
(60…100%)
BA142_28
probe or sensor
covered
Fig. 4.2:
Parameters for standard calibration
Note!
Chapter 4: Level Measurement Prolevel FMC 661
24 Endress+Hauser
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