Apogee Instruments SQ-644 Owner's Manual - Page 10
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OPERATION AND MEASUREMENT
Connect the sensor to a measurement device (meter, datalogger, controller) capable of measuring and displaying a
4-20 mA signal. To maximize measurement resolution and signal-to-noise ratio, the input range of the
measurement device should closely match the output range of the quantum sensor. DO NOT connect the sensor
to a power source greater than 24 V DC.
Wiring for SQ-644
White: 4-20 mA signal output
Red: Input power (7-24 V DC)
Black: Ground (for sensor signal and input power)
Clear: Shield/Ground