OCM (Open Channel Monitor) Flow and Total Calculation
Typically, a water treatment process has a free flowing open channel on the inlet side.
The channel is often restricted by a
PMD
(Primary Measuring Device) having a known
head/flow relationship.
(See note at end of example for monitoring overflow from a wet well or flow
downstream from a Penstock).
The HYDRO+ provides OCM flow and totalized flow calculation with only minimal
application programming. Ensure Operation is set for "OCM" (P001 = 6) and Empty
(P006) is set from the transducer face to the channel bottom at the distance from the
PMD (if used) prescribed by the supplier.
RELAY INTERCONNECTION
The relay contact illustrations adjacent to the HYDRO+ relay terminals are shown in
the power off, de-energized, alarm on, control off condition.
Connect the HYDRO+ relays as follows:
RL1 As indicated by the alarm/control application example used.
RL2 As indicated by the alarm/control application example used.
RL3 As indicated by the alarm/control application example used.
RL4 As indicated by the alarm/control application example used.
RL5 to the remote totalizer (if used)
PL-507 52
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