Apogee SQ-521 Manual - Página 4

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USING APOGEE QUANTUM SENSORS WITH ZENTRA SYSTEM

1. INTRODUCTION

The SQ-521 Full-Spectrum Quantum sensors from Apogee Instruments, Inc. are high-

accuracy, single-band radiometers designed for continuous measurement of photosynthetic

photon flux density (PPFD) or photosynthetically active radiation (PAR) measurement in

indoor or outdoor environments. The Apogee Full-Spectrum Quantum sensor has nearly

equal sensitivity across the spectral range from 389–692 nm (PAR band is 400–700 nm)

and is therefore a good choice for both above- and below-canopy measurement in outdoor

environments and also for indoor environments, where artificial light sources are used.

The information in this document explains how to install the required hardware to mount

Apogee SQ-521 sensors that have been preconfigured by METER Group to work seamlessly

with METER ZENTRA series data loggers. Details of how the ZENTRA system handles the

data are also included. Please read this document carefully in its entirety before going out to

the field.

For more information on Apogee Full-Spectrum Quantum Sensor, please review the

SQ-521 user manual

spectrum-Quantum-sensor).

Follow the steps listed in

bracket, leveling plate, and nylon screws are included with the sensor. Other tools will need

to be provided.

Tools Needed

(apogeeinstruments.com/sq-521-ss-sdi-12-digital-output-full-

Table 1

to install Apogee sensors in the field. A cable, mounting

Table 1 Installation

Wrench 13 mm (0.5 in)

Flathead screwdriver

Mounting post 33.0 to 53.3 mm (1.3 to 2.1 in) diameter post, pole, tripod,

tower, or other similar infrastructure that extends above the canopy

Mounting bracket + leveling plate Model AL-120

Nylon screw 10-32 x 3/8

METER ZENTRA series data logger ZL6 or EM60

METER ZENTRA software ZENTRA Utility, ZENTRA Utility Mobile, or

ZENTRA Cloud