Emerson Rosemount 3490 Series, Reference Manual

Page: 101 / 190

Figure 4-24: Pump 1 and Pump 2 are On (Rising Level Above 8 m)
A
E F
B
C
D
A. Level in m
B. 8.0 m (P421)
C. 5.0 m (P411)
D. 2.0 m (P412)
E. Pump 1
F. Pump 2
Pump 1 and Pump 2 continue to pump down until the level falls to below 2 m (Off Point,
P412 and P422), at which relays RL1 and RL2 de-energize to switch off both pumps (
Figure
4-25 ).
Figure 4-25: Pump 1 and Pump 2 are Off (Falling Level Below 2 m)
A
E F
B
C
D
A. Level in m
B. 8.0 m (P421)
C. 5.0 m (P411)
D. 2.0 m (P412)
E. Pump 1
F. Pump 2
In this emptying application, the common off point is P412 (Off point, relay RL1) and P422
(Off point, relay RL2), both of which are at the 2 m level.
Reference Manual Getting started
00809-0100-4841 January 2021
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