User Manual

12of14 LC900008 RevA
FLOWSWITCHCALIBRATION StepEight
Set Points: If the preset factory calibration is not adequate for your application, follow the calibration steps
listedbelow.Note:theswitch'sinternalLEDwillbeonwhentheswitchdetectsno‐flowandwilloffwhenthe
switchdetectsflow.
1. Install the fitting and flow switch as described in the Installation section of this manual.Turn the flow
switchand controller power on and adjust the flow rate to the application setting.If the medium to be
sensed is likely to be subject to high temperature variations, the flow switch
shouldbesetatthehighestnormaltemperaturelikelytobeencountered.
2. Locate the potentiometer knobatthe  topoftheflow swi tch.The redLE D
is visible through the potenti ometer.(If the LED is on, sl owly adjust the
potentiometer counterclockwise, with a small flat head screwdriver until 
the LE D turns off.)The adjustment is a sing le turn 270° potentiometer.
The initial  response time of the flow switch after adjustment is 1 to 10
seconds.Adjust the potentiometer in slow increments and wait for the
response.Ifthe LED isoff, slowlyadjustthepotentiometerclockwiseuntil
thelight turnson .Thenturnthe  potentiometer counterclockwise tobring
the LED off at a reliable setting.Remember, adjust the potentiometer in
slowincrementsandwaitforthere sponse. 
3. Verifythatthenewcalibrationiscor rect bylowering thesystemflowratebelow
thesetpointandchecktoseethattheredLEDturnson.Thenin crease the flow
rateabovethe setpointandverifythattheredLEDturnsoffaccordingly.
LiquidSwitch
FT10‐___5orFT10‐___2Series
GasSwitch
GT10‐___5orGT10‐___2Series

AccessingtheAdjustmentPotentiometer:Removethetwoscrewsfromthetopoftheprintedcircuitboard
(PCB)andgentlyslidethePCB fromthehousing.UsecautionwhenremovingthePCB.Youwillnowbeable
toseethepotentiometerthroughthehousing.Makeanynecessaryadjustment.Note:Electricalwiringofany
liquid level control system should be performed in accordance with all applicable national, state, and local
codes.Whencompleted,gentlyreturnPCBintohousingandreplacethetwoscrews.
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