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FLOMEC
®
QS200
INSTALLATION GUIDE
The FLOMEC QS200 provides a robust ultrasonic
flowmeter for irrigation applications. The QS200 uses
Percentage of Reading (RD)
Accuracy which is superior to
an impeller flow sensor/flowmeter that uses
Percentage
of Full Scale (FS) Accuracy
ACCURACY WHITE PAPER for more information on RD and
FS information @ http://bit.ly/flomec-accuracy-wp
the QS200 does not have any moving wetted parts, so
there is no need to replace damaged parts.
This meter uses a two-wire system that is connected to an
irrigation controller’s flow sensor input (or decoder’s flow
sensor port) and meets the cable distance recommended
by Irrigation controller/decoder manufacturers. The
two-wire system communicates via a square wave pulse
that is converted to flow rate at the controller (identical
to an impeller flow sensor communicating to irrigation
controller/decoder). The QS200’s power is supplied
through these same two wires by the controller’s/
decoder’s flow sensor input/port
(voltage range of 7.5 V
DC
to 36 V
DC
).
The following lengths of straight pipe should be connected to the QS200 FLOMEC Tee (or NON-FLOMEC Tee):
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10 times the pipe’s inner diameter upstream of the meter
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5 times the pipe’s inner diameter downstream of the meter
The pipe needs to be full of irrigation water with no air inside. Built-up sediment on the QS200’s transducers or large
debris can greatly hinder the meter’s performance. Keep the following in mind when installing:
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Install QS200 at an angle as shown in Figure 1a.
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1 inch pipe installations will need a larger angle
of 45 degrees.
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Flow direction arrows on the QS200 insert must
match flow direction of water through the pipe
(see Figure 1a).
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FLOMEC Tee is bidirectional for flow (the QS200
insert
IS NOT
bidirectional - the flow direction
matters).
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Flow direction of the QS200 should be horizontal
or upward.
DO NOT
install flowmeter in a
downward flow direction, to avoid partially filled
pipes (see Figure 1b).
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When installing below ground, install meter in a
valve box with a thick layer of gravel below the
meter.
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DO NOT
direct bury QS200 flowmeter.
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If using a Non-FLOMEC Tee, verify the QS200
insert physically fits into the Non-FLOMEC Tee.
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DO NOT
pull on the QS200 wires under any
circumstances.
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Confirm that the Controller/Decoder flow sensor
input (or port) will supply the QS200 two-wire
meter with the appropriate power
(7.5 V
DC
to 36 V
DC
).
08/20 IND-1126 Rev A QS200 Installation Guide
GENERAL INSTALLATION PROCEDURE
IMPORTANT:
Read the General Safety Instructions for this flowmeter (see last page) before beginning any installation procedures.
