Apogee SQ-627 Manuel utilisateur

APOGEE INSTRUMENTS, INC. | 721 WEST 1800 NORTH, LOGAN, UTAH 84321, USA

TEL: (435) 792-4700 | FAX: (435) 787-8268 | WEB: APOGEEINSTRUMENTS.COM

OWNER’S MANUAL

EXTENDED RANGE PFD SENSOR

Model SQ-627

(including SS models)

TABLE OF CONTENTS 
Owner’s Manual ............................................................................................................................................................1 
Certificate of Compliance ......................................................................................................................................3 
Introduction...........................................................................................................................................................4 
Sensor Models .......................................................................................................................................................5 
Specifications.........................................................................................................................................................5 
Deployment and Installation .................................................................................................................................8 
Cable Connectors...................................................................................................................................................8 
Operation and Measurement..............................................................................................................................10 
Maintenance and Recalibration ..........................................................................................................................14 
Troubleshooting and Customer Support .............................................................................................................15 
Return and Warranty Policy ................................................................................................................................16 
 
 

CERTIFICATE OF COMPLIANCE

EU Declaration of Conformity

This declaration of conformity is issued under the sole responsibility of the manufacturer:

Apogee Instruments, Inc.

721 W 1800 N

Logan, Utah 84321

USA

for the following product(s):

Models: SQ-627

Type: Extended Range PFD Sensor

The object of the declaration described above is in conformity with the relevant Union harmonization legislation:

2014/30/EU Electromagnetic Compatibility (EMC) Directive

2011/65/EU Restriction of Hazardous Substances (RoHS 2) Directive

2015/863/EU Amending Annex II to Directive 2011/65/EU (RoHS 3)

Standards referenced during compliance assessment:

EN 61326-1:2013 Electrical equipment for measurement, control and laboratory use –EMC requirements

EN 50581:2012 Technical documentation for the assessment of electrical and electronic products with respect to

the restriction of hazardous substances

Please be advised that based on the information available to us from our raw material suppliers, the products

manufactured by us do not contain, as intentional additives, any of the restricted materials including lead (see

note below), mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), polybrominated

diphenyls (PBDE), bis(2-ethylhexyl) phthalate (DEHP), butyl benzyl phthalate (BBP), dibutyl phthalate (DBP), and

diisobutyl phthalate (DIBP). However, please note that articles containing greater than 0.1% lead concentration are

RoHS 3 compliant using exemption 6c.

Further note that Apogee Instruments does not specifically run any analysis on our raw materials or end products

for the presence of these substances, but rely on the information provided to us by our material suppliers.

Signed for and on behalf of:

Apogee Instruments, April 2020

Bruce Bugbee

President

Apogee Instruments, Inc.

INTRODUCTION

Radiation that drives photosynthesis is called photosynthetically active radiation (PAR) and is typically defined as

total radiation across a range of 400 to 700 nm. PAR is almost universally quantified as photosynthetic photon flux

density (PPFD) in units of micromoles per square meter per second (µmol m-2 s-1, equal to microEinsteins per

square meter per second) summed from 400 to 700 nm (total number of photons from 400 to 700 nm). However,

ultraviolet and far red photons outside the defined PAR range of 400-700 nm can also contribute to photosynthesis

and influence plant responses (e.g., flowering).

Sensors that measure PPFD are often called quantum sensors due to the quantized nature of radiation. A quantum

refers to the minimum quantity of radiation, one photon, involved in physical interactions (e.g., absorption by

photosynthetic pigments). In other words, one photon is a single quantum of radiation. Sensors that function like

traditional quantum sensors, but measure a wider range of wavelengths can be thought of as an ‘extended range’

quantum sensor.

Typical applications of traditional quantum sensors include incoming PPFD measurement over plant canopies in

outdoor environments or in greenhouses and growth chambers, and reflected or under-canopy (transmitted) PPFD

measurement in the same environments. The Extended Range PFD Sensor detailed in this manual uses a detector

that is sensitive to radiation up to about 1100 nm, well beyond the range of wavelengths that influence

photosynthesis and plant responses. This means this particular sensor should only be used for photon flux

density measurements under LEDs.

Apogee Instruments SQ-600 series Extended Range PFD Sensors consist of a cast acrylic diffuser (filter),

photodiode, and signal processing circuitry mounted in an anodized aluminum housing. A cable to connect the

sensor to a measurement device is also included. SQ-600 series Extended Range PFD Sensors are designed for

continuous photon flux density measurements in indoor environments under LEDs. The SQ-627 sensors output a

digital signal using SDI-12 communication protocol.

SENSOR MODELS

This manual covers the digital model SQ-627 Extended Range PFD SDI-12 Sensor (in bold below). Additional models

are covered in their respective manuals.

Model

Signal

SQ-620

Self-powered

SQ-622

0-2.5 V

SQ-624

4-20 mA

SQ-625

0-5 V

SQ-626

USB

SQ-627

SDI-12

SQ-628

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.

SPECIFICATIONS

Calibration Traceability

Apogee Instruments SQ-600 series PFD sensors are calibrated through side-by-side comparison to the mean of four

transfer standard PFD sensors under a reference lamp. The transfer standard PFD sensors are recalibrated with a

quartz halogen lamp traceable to the National Institute of Standards and Technology (NIST).

SQ-627-SS

Input Voltage

5.5 to 24 V DC

Current Draw

1.4 mA (quiescent), 1.8 mA (active)

Calibration Uncertainty

± 5 % (see Calibration Traceability below)

Measurement Range

0 to 4000 µmol m-2 s-1

Measurement

Repeatability

Less than 0.5 %

Calibrated Output Range

0 to 200 mV

Long-term Drift

(Non-stability)

Less than 2 % per year

Non-linearity

Less than 1 % (up to 4000 µmol m-2 s-1)

Response Time

0.6 s, time for detector signal to reach 95 % following a step change; fastest data transmission

rate for SDI-12 circuitry is 1 s

Field of View

180°

Spectral Range

340 to 1040 nm ± 5 nm (wavelengths where response is greater than 50 %; see Spectral

Response below)

Directional (Cosine)

Response

± 2 % at 45° zenith angle, ± 5 % at 75° zenith angle (see Directional Response below)

Azimuth Error

Less than 0.5 %

Tilt Error

Less than 0.5 %

Temperature Response

-0.11 ± 0.04 % per C

Uncertainty in Daily Total

Less than 5 %

Housing

Anodized aluminum body with acrylic diffuser

IP Rating

IP68

Operating Environment

-40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m

Dimensions

30.5 mm diameter, 37 mm height

Mass (with 5 m of cable)

140 g

Cable

5 m of two conductor, shielded, twisted-pair wire; TPR jacket; pigtail lead wires; stainless steel

(316), M8 connector

Warranty

4 years against defects in materials and workmanship

Spectral Response

Cosine Response

Directional, or cosine, response is defined as the

measurement error at a specific angle of radiation

incidence. Error for Apogee SQ-600 series Extended Range

PFD Sensor is approximately ± 2 % and ± 5 % at solar zenith

angles of 45° and 75°, respectively.

Mean spectral response measurements of

six replicate Apogee SQ-600 series Extended

Range PFD Sensors. Spectral response

measurements were made at 10 nm

increments across a wavelength range of

300 to 1100 nm in a monochromator with

an attached electric light source. Measured

spectral data from each PFD sensor were

normalized by the measured spectral

response of the monochromator/electric

light combination, which was measured with

a spectroradiometer

DEPLOYMENT AND INSTALLATION

Mount the sensor to a solid surface with the nylon mounting screw provided. To accurately measure photon flux

density incident on a horizontal surface, the sensor must be level. An Apogee Instruments model AL-100 leveling

plate is recommended for this purpose. To facilitate mounting on a cross arm, an Apogee Instruments model AM-

110 mounting bracket is recommended.

To minimize azimuth error, the sensor should be mounted with the cable pointing toward true north in the

northern hemisphere or true south in the southern hemisphere. Azimuth error is typically less than 0.5 %, but it is

easy to minimize by proper cable orientation.

In addition to orienting the cable to point toward the nearest pole, the sensor should also be mounted such that

obstructions (e.g., weather station tripod/tower or other instrumentation) do not shade the sensor. Once

mounted, the green cap should be removed from the sensor. The green cap can be used as a protective covering

for the sensor when it is not in use.

Nylon Screw: 10-32 x 3/8

Model: AL-110

Model: AL-120

Nylon Screw: 10-32 x 3/8

CABLE CONNECTORS

Apogee started offering cable connectors on some

bare-lead sensors in March 2018 to simplify the

process of removing sensors from weather stations

for calibration (the entire cable does not have to be

removed from the station and shipped with the

sensor).

The ruggedized M8 connectors are rated IP68,

made of corrosion-resistant marine-grade stainless-

steel, and designed for extended use in harsh

environmental conditions.

Cable connectors are attached directly to the head.

Instructions

Pins and Wiring Colors: All Apogee connectors

have six pins, but not all pins are used for every

sensor. There may also be unused wire colors

inside the cable. To simplify datalogger

connection, we remove the unused pigtail lead

colors at the datalogger end of the cable.

If a replacement cable is required, please contact

Apogee directly to ensure ordering the proper

pigtail configuration.

Alignment: When reconnecting a sensor, arrows

on the connector jacket and an aligning notch

ensure proper orientation.

Disconnection for extended periods: When

disconnecting the sensor for an extended period

of time from a station, protect the remaining half

of the connector still on the station from water

and dirt with electrical tape or other method.

A reference notch inside the connector ensures

proper alignment before tightening.

When sending sensors in for calibration, only send the

sensor head.

Tightening: Connectors are designed to be firmly

finger-tightened only. There is an o-ring inside the

connector that can be overly compressed if a

wrench is used. Pay attention to thread alignment

to avoid cross-threading. When fully tightened, 1-

2 threads may still be visible.

WARNING: Do not tighten the connector by

twisting the black cable or sensor head, only twist

the metal connector (yellow arrows).

Finger-tighten firmly

OPERATION AND MEASUREMENT

The SQ-627 Extended Range PFD sensor has a SDI-12 output, where photosynthetically active radiation is returned

in digital format. Measurement of SQ-627 Extended Range PFD sensors requires a measurement device with SDI-

12 functionality that includes the M or C command.

Wiring

Sensor Calibration

All Apogee SDI-12 Extended Range PFD sensor models (SQ-600 series) have sensor-specific calibration coefficients

determined during the custom calibration process. Coefficients are programmed into the microcontrollers at the

factory.

SDI-12 Interface

The following is a brief explanation of the serial digital interface SDI-12 protocol instructions used in Apogee SQ-

627 Extended Range PFD sensors. For questions on the implementation of this protocol, please refer to the official

version of the SDI-12 protocol: http://www.sdi-12.org/specification.php (version 1.4, August 10, 2016).

Overview

During normal communication, the data recorder sends a packet of data to the sensor that consists of an address

and a command. Then, the sensor sends a response. In the following descriptions, SDI-12 commands and

responses are enclosed in quotes. The SDI-12 address and the command/response terminators are defined as

follows:

Sensors come from the factory with the address of “0” for use in single sensor systems. Addresses “1 to 9” and

“A to Z”, or “a to z”, can be used for additional sensors connected to the same SDI-12 bus.

“!” is the last character of a command instruction. In order to be compliant with SDI-12 protocol, all commands

must be terminated with a “!”. SDI-12 language supports a variety of commands. Supported commands for the

Apogee Instruments SQ-627 Extended Range PFD sensors are listed in the following table (“a” is the sensor

address. The following ASCII Characters are valid addresses: “0-9” or “A-Z”).

White: Positive (signal from sensor)

Red: Input Power

Black: Ground (from sensor signal and output power)

Clear: Shield/Ground

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