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OCF 6.1 Open Channel Flow Monitor
SIMULATION
Exercises the 4-20mA (0-5V) output, digital display and control relays.
Test
Select
Maximum
and press
to simulate maximum Flow, Range
or Level and to output 20mA (5V) to the analog channel.
Select
Minimum
and press
to simulate minimum Flow, Range
or Level and to output 4mA (0V) to the analog channel.
To simulate an intermediate Flow, Range or Level set
Test
to
Actual
and then enter a value for the
Flow
,
Range
or
Level
. The
analog output and control relays will respond to the simulated
value.
TECH’S MENU
Dist = Max
Choose YES to set the measured range as the Max Range.
This is used when the level in the flume/weir/tank is at the
zero level point, to quickly calibrate the Max Range so that
a manual measurement does not need to be taken.
Barrier
Will be set from the factory. NO when no intrinsic safety
barriers are installed, and YES when barriers are installed.
Standpipe
Will be set to NO from the factory. Only select YES after
factory recommendation to do so. Reduces the frequency of
pulses sent from the transducer, to reduce the potential
negative impact of false echoes from inside a tank or
standpipe.
Long Pulse
Will be set to NO from the factory. Only select YES after
factory recommendation to do so.
Gain
Displays a read-only value of the automatic gain level.
Higher values indicate that the received echo is being
amplified more. Values near the max of 255 indicate
maximum amplification, and sources of echo attenuation
should be investigated, such as wrong wire types spliced
into the sensor cable, surface foam, vapors in the
atmosphere, or a transducer not parallel to the fluid surface.
- - Si mu l a t i o n - - - - - - - -
Te s t
Ac t u a l
Fl o w
/ m
2 5 0 USG
Fl o w
4 . 0 0
4 - 2 0 mA
Re l a y s 1 2 3 4 5 6
- - T e c h s Me n u - - - - - - -
’
Di s t = Ma x
No
Ba r r i e r
No
St a n d p i p e
No
L o n g Pu l s e
No
Ga i n
1 1 5
