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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

 (

download the FLOWMETER 

ACCURACY WHITE PAPER for more information on RD and 

FS information @ http://bit.ly/flomec-accuracy-wp

). Also, 

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.

 

-

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.

Summary of Contents for QS200

Page 1: ...f the meter 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 Install QS200 at an angle as shown in Figure 1a 1 inch pipe installations will need a larger angle of 45 degrees Flow ...

Page 2: ...sert in the Tee but it is recommended to install the Tee first without the QS200 insert inside This will keep excess PVC cement off of the QS200 insert 2 Clean and apply Primer to pipe ends and tee sockets See Figure 3 3 Apply PVC cement to pipe ends and Tee sockets and quickly assemble the parts while the cement is fluid Follow the cement manufacturer s instructions See Figure 4 NOTE Only use PVC...

Page 3: ...etrofits 1 The Tee insert bore must be clean before installing the insert and the 2 black O rings on the insert should be fully lubricated a The O rings on the outside of the QS200 Retrofit Insert are square profile O rings When installing in another brand of Tee if the insert fits too tight into the Tee replace the square profile O rings with the round profile O rings included with the QS200 Retr...

Page 4: ... or driving wedge between the insert lip and top of the tee to break the insert loose and gain room between the insert lip and tee to use the U formed end to lever the insert up and out 2 An alignment tool to align the pin holes of the new insert with the pin holes in the tee 3 A cleaning tool for clearing debris from the valve box lid groove or other crevices The U formed end is designed for use ...

Page 5: ...all New QS200 Insert FLOMEC Multi Tool PIN HOLE ALIGNMENT For easy pin install CLEAN LID GROOVE Remove dirt roots debris Figure 10 Remove Old Insert From Tee with FLOMEC Multi Tool PRY UP To break a stuck insert loose LEVERAGE To Lift insert up and out DRIVING WEDGE To lift insert more ...

Page 6: ... from the meter to the controller decoder to prevent ground interference Make sure cable length is within controller decoder manufacturer s recommendation 7 Connect the and ends as described in Step 3 of this section of the direct burial cable to the controller s decoder s flow sensor input or port per controller decoder manufacturer s direction Keep in mind that the flow sensor input typical desi...

Page 7: ...to devices as flow sensor instead of flowmeter 1 Make sure line is full of water with no trapped air 2 Flow meter may take a few minutes to start averaging out flow per irrigation controller displays 3 It is recommended to monitor and observe stabilized flow rates before setting control limits Operation QS200 WIRING INSTALLATION continued RED BLACK DBR Y 6 SPLICE KIT FLOW INSERT TO FLOW ON FLOW SM...

Page 8: ...o putting into service Product should never be operated outside its published specifications for temperature or pressure See specifications for your model When applying power adhere to specifications listed in appropriate electronics manual Make sure flow and pressure have been eliminated from process pipe prior to installing or removing product This product is not approved for use with petroleum ...

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