Apogee Instruments SQ-644 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

QUANTUM LIGHT POLLUTION

SENSOR

Models SQ-644

Rev: 4-Oct-2021

TABLE OF CONTENTS 
Owner’s Manual ............................................................................................................................................................................... 1 
Certificate of Compliance......................................................................................................................................................... 3 
Introduction ............................................................................................................................................................................. 4 
Sensor Models ......................................................................................................................................................................... 5 
Specifications ........................................................................................................................................................................... 6 
Deployment and Installation.................................................................................................................................................... 8 
Cable Connectors..................................................................................................................................................................... 9 
Operation and Measurement ................................................................................................................................................ 10 
Maintenance and Recalibration............................................................................................................................................. 13 
Troubleshooting and Customer Support................................................................................................................................ 14 
Return and Warranty Policy................................................................................................................................................... 15 
 

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-644

Type: Quantum Light Pollution 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, October 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 Quantum Light Pollution Sensors consist of a cast acrylic diffuser (filter),

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

sensor to a measurement device. SQ-600 series sensors are designed for continuous photon flux density

measurements in indoor environments under LEDs. The SQ-640 Quantum Light Pollution models output a voltage

that is directly proportional to photon flux density. The voltage output by the sensor is directly proportional to

radiation incident on a planar surface (does not have to be horizontal), where the radiation emanates from all

angles of a hemisphere.

SENSOR MODELS

This manual covers the amplified voltage output model SQ-644 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

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 quantum light pollution sensors are calibrated through side-by-side comparison

to the mean of four transfer standard quantum light pollution sensors under a reference lamp. The transfer

standard quantum light pollution sensors are recalibrated with a quartz halogen lamp traceable to the National

Institute of Standards and Technology (NIST).

SQ-644-SS

Power Supply

12 to 24 V DC

Current Draw

Maximum of 20 mA

Sensitivity

0.08 mA per µmol m-2 s-1

Calibration Factor

12.5 µmol m-2 s-1 per mA

Calibration Uncertainty

± 5 % (see Calibration Traceability below)

Output Range

4 to 20 mA

Measurement Range

0 to 200 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

Less than 1 ms

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 Quantum Light

Pollution 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 Quantum

Light Pollution 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 quantum light

pollution 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-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

Connect the sensor to a measurement device (meter, datalogger, controller) capable of measuring and displaying a

4-20 mA signal. To maximize measurement resolution and signal-to-noise ratio, the input range of the

measurement device should closely match the output range of the quantum sensor. DO NOT connect the sensor

to a power source greater than 24 V DC.

Wiring for SQ-644

White: 4-20 mA signal output

Red: Input power (7-24 V DC)

Black: Ground (for sensor signal and input power)

Clear: Shield/Ground

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