Sensor Models - Apogee SQ-640 Owner's Manual

SENSOR MODELS

This manual covers the unamplified model SQ-640 Quantum Light Pollution Sensor (in bold below). Additional
models are covered in their respective manuals.
Model Signal
SQ-640 Self-powered
SQ-642 0-2.5 V
SQ-644 4-20 mA
SQ-645 0-5 V
SQ-646 USB
SQ-647 SDI-12
SQ-648 Modbus
Sensor model number and serial number are
located on the bottom of the sensor. If the
manufacturing date of a specific sensor is
required, please contact Apogee Instruments
with the serial number of the sensor.