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OPERATION AND MEASUREMENT

Connect the sensor to a measurement device (meter, datalogger, controller) capable of measuring and displaying

or recording a millivolt signal (an input measurement range of approximately 0-2.5 V (SQ-642) or 0-5 V (SQ-645) is

required to cover the entire range of PFD from the sun). To maximize measurement resolution and signal-to-noise

ratio, the input range of the measurement device should closely match the output range of the extended range

PFD sensor. DO NOT connect the sensor to a power source greater than 24 V DC.

Wiring for SQ-642 and SQ-645

White: Positive (signal from sensor)

Red: Input power (SQ-642 5-24 V DC, SQ-645 5.5-

24 V DC)

Black: Ground (for sensor signal and input power)

Clear: Shield/Ground