Pyxis 53607, User Manual, Page: 11 / 27

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3 Quick 4-20mA Start Up
Follow the wiring table below to connect the ST-765SS series sensor to a controller.
Wire Color Designation
Red 24 V +
Brown Power Ground
Green Shield, solution ground
Gray 4-20 mA -
White Free Chlorine or Chlorine Dioxide 4-20 mA +
Pink pH 4-20 mA +
Blue RS-485 A
Yellow RS-485 B
Black Shield, solution ground
*NOTE* If the 24V power ground and the 4-20 mA-return in the controller are internally connected (non-
isolated 4-20mA input), it is unnecessary to connect the 4-20 mA- (Gray wire) to the 4-20 mA negative
terminal in the controller. If a separate DC power supplier other than that from the controller is used, make
sure that the output from the power supply is rated for 22-26 VDC @ 85mA.
4 Calibration and Diagnosis
The ST-765SS Series sensors are rigorously calibrated before leaving the factory. As such, users do not need
to calibrate the sensor for a period of three months or up to one year if the sensor is maintained in clean
condition. Users can however calibrate the sensor according to their application needs and as desired using
the MA-CR Bluetooth adapter and uPyxis APP for mobile or desktop devices.
4.1
Calibration and Diagnosis by uPyxis Mobile App
Connect and power the ST-765SS sensor using the MA-CR Pyxis Bluetooth adapter (P/N: MA-CR) as shown in
the following connection diagram. The power should be sourced from a 24 VDC power terminal of a
controller. If a controller is not available, please purchase a 24VDC power supply.
MA-CR Bluetooth Adapter