SECTION 4
OpenChannel Flowmeter Default Program
Changing the application to Open Channel Flow Monitoring loads this default program into
memory.
Pr.2.0 Empty Distance
1.200m
Pr.4.0 Blanking 0.500m
Pr.3.0 Operational Span
0.280m
Flow
Transducer position
3 - 4 times max. head
0.90 – 1.20m
This default program is created to do the following:-
Standard Ratio Rectangular flume, with a maximum flow of 50 litres per second at
head 28cm.
Loss-of-Echo indication to telemetry system.
4-20mA output proportional to flow.
Totalise flow and provide pulsed output to external totaliser every 1000 litres.
Display flow reading.
This program can be easily modified to suit the required application. You should delete from
this program any unwanted entries (e.g. Relay 1 settings).
Parameter Default Description
number Setting
2.0 Empty Distance = 1.200 Distance from transducer to bottom of channel.
3.0 Operational Span = 0.280 Level at which maximum flow rate value is
defined.
4.0 Blanking = 0.500 Blanking zone into which level will not rise. It
is suggested that this is above the top of the
channel to allow the system to continue reading
up to that level.
5.0 RateOfChange = 1.000 Rate of change of level 1m/min.
7.1 Flow device = 7.1.1 Std. Ratio Rect. Flume 3/2 To define that a rectangular flume is being
used (Not BS3680).
7.3 Maximum Flow = 50 Defines the maximum flow is 50 litres per
second.
7.4 Totaliser Units = 7.4.2 Totalise In m3 To avoid totaliser overflow, totalise in cubic
metres
8.1 Rly1 Options = 8.1.6 Flow alarm Relay 1 to alarm on flow (normally
energised)
8.1.1.1 Relay 1 Set = 45 Relay 1 to de-energise at 45 litres per second to
indicate flow alarm.
8.1.1.2 Relay 1 Reset = 40 Relay 1 to re-energise at 40 litres per second to
clear the flow alarm.
Ref: MINIFLEX LR MANUAL Rev. 0 39
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