User Manual

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 0-500 mV is required to cover the
entire range of PPFD from the sun). In order 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. The sensor is self-powered and applying voltage will damage the sensor.
VERY IMPORTANT: Apogee changed the wiring colors of all our bare-lead sensors in March 2018 in
conjunction with the release of inline cable connectors on some sensors. To ensure proper connection to your
data device, please note your serial number or if your sensor has a stainless-steel connector 30 cm from the
sensor head then use the appropriate wiring configuration listed below. With the switch to connectors, we also
changed to using cables that only have 4 or 7 internal wires. To make our various sensors easier to connect to
your device, we clip off any unused wire colors at the end of the cable depending on the sensor. If you cut the
cable or modify the original pigtail, you may find wires inside that are not used with your particular sensor. In
this case, please disregard the extra wires and follow the color-coded wiring guide provided.
Wiring for:
SQ-110 and SQ-120 Serial Numbers 25370 and above
SQ-313, SQ-323, SQ-316, SQ-326, SQ-311, SQ-311 Serial Number 3205 and above or with a
connector
Wiring for:
SQ-110 and SQ-120 Serial Numbers range 0-25369
SQ-313, SQ-323, SQ-316, SQ-326, SQ-311, SQ-311 Serial Numbers range 0-3204
Red: Positive (signal from sensor)
Black: Negative (signal from sensor)
Clear: Shield/Ground
Black: Negative (signal from sensor)
Clear: Shield/Ground
White: Positive (signal from sensor)