WESTLOCK CONTROLS
280N MIDLAND AVENUE, STE.258, SADDLE BROOK, NJ 07663 TEL: 201-794-7650 FAX: 201-794-0913
www.westlockcontrols.com
12/20/2017 TECH-533/ D.W.O. 22902 Page 10 of 20
4.3 Calibration
There are 3 auto calibrate modes (all modes auto calibrate the Transmitter)
o Auto Calibration for 4mA to 20mA.
o Calibration for Low current calibration other than 4mA.
o Calibration for High current calibration other than 20mA.
4.3.1 Auto Calibration for 4mA to 20mA operation
This is a two Key auto calibration that defines 4mA for the valve being fully closed and
20mA for valve being fully open. The Transmitter Function is being automatically
calibrated during this procedure.
Time for the first move in calibration will be set at a maximum of 30 seconds for REG CAL
and all subsequent time outs are keyed off the time it takes to go from closed to open, to
create much shorter subsequent time outs for smaller valves. The initial 2 minute time
out can be lengthened in the Manual Calibration routine Long CAL.
Press
SEL Key until the Display shows “AUTO CAL” then press Key.
Auto calibration will occur for 4mA low current and 20mA high current.
The display will show:
AUTO CAL
STARTED
LOW CAL The valve is closed and the closed position recorded.
HIGH CAL The valve is opened and the open position recorded.
GAIN The valves best gain setting is found.
CALIBRATION SUCCESS
XX % Percent valve opening for forward acting / closing for reverse acting.
4.3.2 Auto Calibration for Low current Calibration other than 4mA (Split Range)
The Low calibration refers to the input current value that drives the valve into the fail
position.
The Transmitter Function is being automatically calibrated during this procedure.
First follow the procedure for the Auto Calibration
Next set loop current to the desired value.
Press the
SEL Key until the display shows “LO CAL” then press Key.
The calibration will adjust to the desired low current.
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