KROHNE BM 90 EN - Manual (Page 27)

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4. Examples
4.1 Level measurement mode (Pr.1 = 1)
Applications for this mode are Level Measurement, Contents Measurement and Pump Control.
The application : l To measure and display the level of liquid in meters
l Maximum level 3 m,
l Fill rate 0.1 meter/min
l Alarm if level exceeds 2.8 m
l 0-20 mA signal proportional to level
Pr. 1 = 1 Defines level measurement.
Pr. 2 = 2 Programme units are meters.
Pr. 3 = 4 Distance of transducer from the zero level.
Pr. 4 = 3 The span, based on zero level.
Pr. 5 = 0.5 Blanking zone into which level should not rise.
Pr. 6 = 0.1 The maximum rate of change of liquid level in meters/min.
Pr. 8 = 1 Relay 1 to alarm on level (normally energised).
Pr. 9 = 2.8 Relay 1 de-energised at 2.8 m indicates high alarm.
Pr.10 = 2.6 Relay 1 re-energised at 2.6 m to clear the high alarm.
Pr.23 = 3 Hold alarm indication (relay 1) on failsafe.
Pr.28 = 3 Analogue output holds on failsafe.
Pr.30 = 3 0.20 mA output fixed to span (Pr.4).
Pr.78 Simulate the program.
3.0m
(Pr.4)
4.0m
(Pr.3)
Reset Alarm
2.8m (Pr.9)
Set Alarm
0.5m (Pr.5)
2.6m
(Pr.10)