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3.2
O
PEN
C
HANNEL
F
LOW
M
EASUREMENT
•
For ultimate accuracy, install the sensor as close as possible above the expected maximum water level (see minimum measuring range).
•
Install the device in a place defined by the characteristics of the metering channel along the longitudinal axis of the flume or weir. In case of Parshall
flumes supplied by DELTA MOBREY the location of the sensor is marked.
•
In some cases foam may develop on the surface. Make sure that the surface, opposite to the sensor remain free of foam for proper sound reflection.
•
From the point of view of measurement accuracy the length of the channel sections preceding and following the measuring flume and their method of
joining to the measuring channel section are of critical importance.
•
Despite of the most careful installation, the accuracy of flow metering will be lower than that of specified for the distance measurement. It will be
determined by the features of the flume or weir applied.
3.3
I
NSTALLATION AND
E
LECTRICAL
C
ONNECTION
Installation of the (BSP or NPT) threaded models
•
Screw the unit in to its place. Use open wrench for
tightening; max torque is 20 Nm
•
After tightening the enclosure can be rotated to the proper
position. (Safety bolt prevents rotation more than 350°)
•
The unit may be damaged by electrostatic discharge (EDS)
via its terminal, thus apply the precautions commonly used
to avoid electrostatic discharge e.g. by touching a properly
grounded point before removing the cover of the enclosure.
2
1
Display unit
connector
Connect or for
meas. of loop current
4...20 mA loop current
and suppl.voltage (HART)
GND
1/2” NPT
1/2” NPT
M20x1.5
M20x1.5
I
2 3 4 5 6
C2
5
4
6
C1
(Only normal
version
)
2 3
1 2
U
1
RELAY
•
Ensure that the power supply is turned off at the source.
•
With removal of the cover of the housing and taking out the display module (if any), the
screw terminals can be accessed. Suggested cable core cross section:
0.5
–
1.5 mm
2
* [20
–
15 AWG]. Arrange grounding by the inner or outer grounding
screw first.
•
Switch on the unit and make necessary programming.
•
After programming ensure proper sealing and closing of the cover.
