Endress+Hauser prolevel FMC 661 - Page 41

Standard method
The standard method can be used for all probes and sensors:
• The switching delay (0…30 s) determines the delay between the covering or
uncovering and the switching of the Liquiphant (or capacitance probe).
• The installation height is the height above the 0% level expressed in the same
units (%, m, ft, hl, gal, tonnes etc.) as the subsequent calibration step.
The »full« calibration is carried out automatically when the product reaches the external
limit switch. Since the default display sensitivity is used during this time, the display at
V0H0 may be initially incorrect and analogue signal/relays not function as set.
Sensor calibration
capacitance limit switch
+ level sensor
# 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 1 Sensor = Capacit.
9 - »E« Register entry
10 V8H5 0 Sensor uncovered
11 - »E« Register entry
12 V8H6 e.g. 1 Switch point in Hz
- »E« Register entry
»Empty« calibration
# Matrix Entry Remarks
13 V0H1 0 »Empty« level
14 - »E« Register entry
Note!
• The sensor calibration for Liquiphant
limit switches is described on p. 38
• If the probe ist covered, V8H5 = 1
• V8H6: if the probe is top-mounted there
is an additional delay (Table 5.1, p. 39).
Next step… • If appropriate, linearisation, p. 25…27
• If appropriate, level offset, p. 25
• Analogue output and relays, p. 30…33,
— assign relays 2a/2b to channel 1.
Note!
BA142_45
»Full« = 100%
installation height %
measuring range
e.g. 75%
»Empty« = 0%
»Full«, e.g. 2000 hl
installation height "hl"
measuring range
e.g. 1500 hl
»Empty« 0 hl
Calibration in %
Calibration in hl
Fig. 5.3:
Parameters for standard calibration, level
measurement with automatic calibration correction
Prolevel FMC 661 Chapter 5: Level Measurement with Limit Switch
Endress+Hauser 37