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-512) or 0-5 V (SQ-515) is
required to cover the entire range of PPFD from the sun).
In order to maximize the measurement resolution and
signal-to-noise ratio, the signal input range of the measurement device should closely match the output range of
the quantum sensors. The amplification circuit requires a power supply of 5.5 to 24 V DC. NOTE: To prevent sensor
damage,
DO NOT connect the sensor to a power source greater than 24 VDC.
VERY IMPORTANT:
Apogee changed all wiring colors of 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 below.
Wiring for SQ-512 & SQ-515 Serial Numbers 1690 and above or with a cable connector
Wiring for SQ-512 & SQ-515 Serial Numbers within Range 0-1689
White: Output
Red: Power
Black: Ground
White: Positive (signal from sensor)
Red: Input Power SQ-512 5-24 V DC,
SQ-515 5.5-24 V DC
Black: Ground (from sensor signal and output power)
Clear: Shield/Ground