apogee INSTRUMENTS SQ-521 Full Spectrum Quantum Sensor Instruction Manual

: June 13, 2024
: apogee INSTRUMENTS

Table of Contents

apogee INSTRUMENTS SQ-521 Full Spectrum Quantum Sensor
Product Information
Product Usage Instructions
INTRODUCTION
INSTALLATION
DATA INTERPRETATION
TROUBLESHOOTING
CUSTOMER SUPPORT
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

apogee INSTRUMENTS SQ-521 Full Spectrum Quantum Sensor

Product Information

The Apogee Quantum Sensor is a high-quality sensor used for measuring incoming PPFD (Photosynthetic Photon Flux Density) in outdoor environments. It is designed to work seamlessly with the Zentra System, providing accurate and reliable data.

Made in the USA, this sensor comes with a cable, mounting bracket, leveling plate, and screws for easy installation. It is compatible with most meteorological stands, poles, tripods, and other mounts.

Product Usage Instructions

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1.  **Preparation:**
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- Conduct a system check in the lab or office before installation.
- Inspect and verify all components are intact.
- Visit the data logger product page for the latest software and firmware.
- Verify that all sensors are functional and read within expected ranges.
Consider the Surroundings:

  * For measuring incoming PPFD outdoors, choose a location above the plant canopy or with an unobstructed view of the sky.
  * Ensure the sensor is not shaded by nearby objects.
3.  **Mounting:**
  * Use the provided U-bolt to mount the sensor assembly on a mounting post.
  * Orient the sensor so that the cable points toward true North (Northern hemisphere) or true South (Southern hemisphere).
  * Tighten the U-bolt nuts by hand until hand-tight, and then use a wrench to secure them. Do not over tighten.
  * Adjust the three machine screws on the leveling plate until the integrated bubble level indicates that the sensor is level.
  * Remove the blue cap from the sensor once it is mounted. The cap can be used as a protective covering when the sensor is not in use.
4.  **Secure and Protect Cables:**

It is important to properly protect the cables to prevent damage or disconnection. Common causes of cabling issues include rodent damage, driving over sensor cables, tripping over cables, not leaving enough cable slack during installation, or poor sensor wiring connections.

USING APOGEE QUANTUM SENSORS WITH ZENTRA SYSTEM

INTRODUCTION

The SQ-521 Full-Spectrum Quantum sensor from Apogee Instruments, Inc. is a high-accuracy, single-band radiometer designed for continuous measurement of photosynthetically active radiation (PAR) for both indoor and outdoor environments. The Apogee Full-Spectrum Quantum sensor measures the photosynthetic photon flux density (PPFD) with nearly even sensitivity across the spectral range from 389-692 nm (PAR band is 400-700 nm). Therefore, it’s a good choice for both above and below-canopy measurements in outdoor environments and 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 the Apogee Full-Spectrum Quantum Sensor, please review the SQ-521 User Manual on the Quantum Sensor product page (apogeeinstruments.com/ sq-521-ss-sdi-12-digital-output-full-spectrum-Quantum- sensor).

INSTALLATION

Follow the steps listed in Table 1 to install Apogee sensors in the field. A cable, mounting bracket, leveling plate, and screws are included with the sensor. Other tools will need to be provided.

Tools Needed

| 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 in (included)

METER ZENTRA series data logger ZL6 or EM60

METER ZSC Bluetooth ® Sensor Interface (optional)

METER ZENTRA software ZENTRA Utility, ZENTRA Utility Mobile, or ZENTRA Cloud

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Preparation

| Conduct System Check

METER strongly recommends setting up and testing the system (sensors and data loggers) in the lab or office.

Inspect and verify all components are intact.

Visit the data logger product page for the most up-to-date software and firmware. Verify all sensors are functional and read within expected ranges.

Consider the Surroundings

For measurement of incoming PPFD in the outdoor environment, choose a location that allows the sensor to be above the plant canopy or in a position where the view of the sky is unobstructed (such as a large canopy gap or forest clearing).

Ensure the sensor is not shaded from nearby objects (weather stations, mounting posts, etc.).

	Table 1 Installation (continued)

Mounting

| Install on Mounting Post

Use the U-bolt to mount the mounting bracket and sensor assembly

(Section 2.1). The U-bolt is compatible with most meterological stands, poles, tripods, and other mounts.

Ensure the sensor is oriented so the cable points toward true North (in the Northern hemisphere) or true South (in the Southern hemisphere) to reduce azimuth error.

Secure the System

Tighten the U-bolt nuts by hand until hand-tight, and then tighten with a wrench.

CAUTION

Do not over tighten U-bolts.

Adjust the three machine screws on the leveling plate until the integrated bubble level indicates that the sensor is level. The blue cap should be removed from the sensor once it is mounted. The cap may then be used as a protective covering for the sensor when not in use.

Secure and Protect Cables

NOTE: Improperly protected cables can lead to severed cables or disconnected sensors. Cabling issues can be caused by many factors such as rodent damage, driving over sensor cables, tripping over cables, not leaving enough cable slack during installation, or poor sensor wiring connections.

Install cables in conduit or plastic cladding when near the ground to avoid rodent damage.

Gather and secure cables between the sensors and the data logger to the mounting post in one or more places to ensure cable weight does not pull the plug free from its port.

Connect to Data Logger

Plug the sensor into a data logger.

Use the data logger to make sure the sensor is reading properly. Verify these readings are within expected ranges.

For more instructions on connecting to data loggers, refer to Section 2.2.

SET UP MOUNTING ASSEMBLY

The Apogee Quantum sensor must be level to accurately measure PPFD incident on a horizontal surface. Each Apogee Quantum sensor purchased from METER comes with an AL-120 Solar Mounting Bracket with Leveling Plate. The AL-120 can be mounted to either ahorizontal or vertical post, depending on which set of holes is used.

Align the cable M8 connector pins with the sensor M8 connector holes and seat connectors fully.
Tighten the cable screw until hand-tight (Figure 1).
M8 connectors are easy to overtighten. Do not use pliers or other tools to tighten this connector.
Mount the sensor to the leveling plate (Figure 2) with the included nylon screw.
Attach the leveling plate to the mounting bracket using the included three machine screws.
Attach the mounting bracket either to a horizontal arm (Figure 2) or vertical post using the included U-bolt.

CONNECT TO METER ZENTRA SERIES LOGGER

The Apogee Quantum sensor is preconfigured by METER and works seamlessly with METER ZENTRA series data loggers. The sensor comes with a 3.5-mm stereo plug connector (Figure 3) to facilitate easy connection with the data loggers. Apogee sensors come standard with a 5-m cable.

Check the METER download webpage for the most recent data logger firmware. Logger configuration may be done using either ZENTRA Utility (desktop and mobile application) or ZENTRA Cloud (web-based application for cell-enabled ZENTRA data loggers).

Plug the stereo plug connector into one of the sensor ports on the logger (Figure 4).
Connect to the data logger via ZENTRA Utility with a laptop and USB cable or ZENTRA Utility Mobile app with a mobile device supporting Bluetooth® communication.
Use ZENTRA Utility to scan the ports and make sure the sensors were properly identified by the logger and are reading properly.
NOTE: METER data loggers should automatically recognize the Apogee sensor.
Use ZENTRA Utility to set the measurement interval.
Use ZENTRA Utility to configure communication settings for data transfer to ZENTRA Cloud.

Sensor data can be downloaded from METER data loggers using either ZENTRA Utility or ZENTRA Cloud. Refer to the logger user manual for more information.

DATA INTERPRETATION

The Apogee Quantum sensors used with the ZENTRA system report PPFD in units of micromoles per square meter per second (μmol/m2/s). Additionally, the sensor orientation information is provided in the metadata tab of ZENTRA Cloud and ZENTRA Utility Microsoft® Excel® file downloads. Sensor orientation is reported as the zenith angle in units of degrees, with a zenith angle of 0° indicating a sensor oriented straight up.

TROUBLESHOOTING

This troubleshooting section details possible major problems and their solutions. If the problem is not listed or these solutions do not solve the issue, contact Customer Support.

Problem	Possible Solution
Sensor not responding	Check power to the sensor and logger.

Check sensor cable and stereo plug connector integrity.

Check that the SDI-12 address of the sensor is 0 (factory default). Check this with ZENTRA Utility by going to Actions, select Digital sensor terminal, choose the port the sensor is on, and send the

?I! command to the sensor from the dropdown menu.

Sensor values are not reasonable| Verify the sensor is not shaded.

Verify the angle of sensors.

Cable or stereo plug connector failure| If the stereo plug connector is damaged or needs to be replaced, contact Customer Support for a replacement connector or splice kit.

If a cable is damaged refer to the METER wire-splicing guide for cable repair.

IMPORTANT: It is recommended that Apogee Quantum sensors are returned for factory recalibration every 2 years. Visit Apogee repairs (apogeeinstruments.com/recalibration-and-repairs) or contact Apogee Technical Support (techsupport@apogeeinstruments.com) for details.

CUSTOMER SUPPORT

NORTH AMERICA
Customer support representatives are available for questions, problems, or feedback Monday through Friday, 7:00 am to 5:00 pm Pacific time.

Email: support.environment@metergroup.com
- sales.environment@metergroup.com
Phone: +1.509.332.5600
Fax: +1.509.332.5158
Website: metergroup.com.

EUROPE
Customer support representatives are available for questions, problems, or feedback Monday through Friday, 8:00 to 17:00 Central European time.