Apogee Instruments SQ-626 Manuale utente

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-626

Rev: 30-August-2021

TABLE OF CONTENTS 
Owner’s Manual ............................................................................................................................................................................... 1 
Certificate of Compliance............................................................................................................................................................. 3 
Introduction.................................................................................................................................................................................. 4 
Sensor Models.............................................................................................................................................................................. 5 
Specifications................................................................................................................................................................................ 6 
Deployment and Installation ........................................................................................................................................................ 8 
Software Installation .................................................................................................................................................................... 9 
Windows Software ..................................................................................................................................................................... 10 
Mac Software ............................................................................................................................................................................. 15 
Maintenance and Recalibration ................................................................................................................................................. 20 
Troubleshooting and Customer Support .................................................................................................................................... 21 
Return and Warranty Policy ....................................................................................................................................................... 22 
 

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-626

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 we rely on the information provided to us by our material suppliers.

Signed for and on behalf of:

Apogee Instruments, August 2021

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.

SENSOR MODELS

This manual covers the USB quantum sensor, model SQ-626 (listed 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

A sensor’s 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-626

Resolution

0.1 µmol m-2 s-1

Calibration Factor

Custom for each sensor and stored in the firmware

Calibration Uncertainty

± 5 % (see calibration Traceability below)

Measurement Range

0 to 4000 µmol m-2 s-1

Measurement Repeatability

Less than 0.5 %

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

Software updates every second

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 Cosine Response below)

Temperature Response

-0.11± 0.04 % per C

Azimuth Error

Less than 0.5 %

Tilt Error

Less than 0.5 %

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

USB Cable

4.5 m (15 ft)

Current Draw (when Logging)

61 mA

Spectral Response

Cosine Response

Mean spectral response measurements of six

replicate Apogee SQ-100 (original) and SQ-

500 (full-spectrum) series quantum sensors.

Spectral response measurements were made

at 10 nm increments across a wavelength

range of 300 to 800 nm with a

monochromator and an attached electric

light source. Measured spectral data from

each quantum sensor were normalized by

the measured spectral response of the

monochromator/electric light combination,

which was measured with a

spectroradiometer.

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 AL-

120 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 blue cap should be removed from the sensor. The blue 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-100

Model: AL-120

Nylon Screw: 10-32 x 3/8

SOFTWARE INSTALLATION

The most recent version of ApogeeConnect software can be downloaded at

http://www.apogeeinstruments.com/downloads/.

Installing the software on a PC (Windows compatible, XP and later)

1. Double click on the installer package:

2. On the ‘Welcome’ screen, please click ‘Next’ to continue.

3. Select the radio button next to “I Agree” to the UELA… and click ‘Next’ to continue.

4. On the ‘Ready to Install the Program’ screen, click ‘Install’ to continue.

5. Click ‘Finish’ to complete the installation. There are shortcuts on your desktop and in your start bar.

Installing the software on a Mac (Mac compatible, 10.10 and later)

1. Double click on the installer package

2. On the ‘Introduction’ screen, please click ‘Continue’ to proceed.

3. Select ‘Continue’ on the ‘Read Me’ screen to continue, this screen contains a history of updates made to

the ApogeeConnect software versions.

4. Select ‘Continue’ on the ‘License’ screen to receive a prompt to agree to the terms of the software license

agreement. Click ‘Agree’ to continue once you receive the prompt.

5. On the ‘Installation Type’ screen, click ‘Install’ to install the software. You can change the location the

software installs to by clicking ‘Change Install Location…’. *Note: You may be prompted for an

administrator password at this time. If you are, proceed by entering your respective password and clicking

‘Install Software’.

6. Once you receive the message “The installation was successful.” on the ‘Summary’ screen click ‘Close’.

Your software is now ready to be used.

WINDOWS SOFTWARE

When the SQ-626 sensor is not plugged into the USB

port, the software will display a message in the lower left

corner, “Device Not Connected,” indicating it cannot

establish communication with the sensor.

Plug the sensor into a USB port and allow some time

for the sensor to automatically establish

communication with the software. Once established,

the message in the lower left corner will display

“Device Connected-Model: SN ####” and real-time PFD

readings will update on the screen. Moving the sensor

closer to a light source should increase the readings,

while blocking all light from the sensor should drop the

reading to zero.

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