Apogee SQ-212 Manual de usuario

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 SENSOR

Model SQ-212, SQ-222, SQ-215, and SQ-225

(including SS models)

TABLE OF CONTENTS

Owner’s Manual ................................................................................................................................................................................................................ 1

Certificate of Compliance .................................................................................................................................................................................... 3

Introduction............................................................................................................................................................................................................. 4

Sensor Models ......................................................................................................................................................................................................... 5

Specifications........................................................................................................................................................................................................... 6

Deployment and Installation.............................................................................................................................................................................. 9

Operation and Measurement...........................................................................................................................................................................11

Maintenance and Recalibration.......................................................................................................................................................................15

Troubleshooting and Customer Support......................................................................................................................................................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-212, SQ-222, SQ-215, SQ-225

Type: Quantum 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

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 cadmium, hexavalent chromium, lead,

mercury, polybrominated biphenyls (PBB), polybrominated diphenyls (PBDE).

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, May 2016

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 often expressed as photosynthetic photon flux density (PPFD): photon flux

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). While Einsteins and micromoles are equal (one

Einstein = one mole of photons), the Einstein is not an SI unit, so expressing PPFD as µmol m-2 s-1 is preferred.

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.

Typical applications of 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.

Apogee Instruments SQ series quantum 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. Sensors

are potted solid with no internal air space, and are designed for continuous PPFD measurement in indoor or outdoor

environments. SQ series sensors output an analog voltage that is directly proportional to PPFD under sunlight (e.g., model

SQ-215) or electric lights (e.g., model SQ-225). The voltage signal from 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 quantum sensor models SQ-212/SQ/222 and SQ-215/SQ-225, which provide a voltage signal. Additional

models are covered in their respective manuals.

Model

Signal

Calibration

SQ-212 0-2.5 V Sunlight

SQ-222 0-2.5 V Electric light

SQ-215 0-5 V Sunlight

SQ-225 0-5 V Electric light

SQ-110 Self-powered Sunlight

SQ-120 Self-powered Electric light

SQ-214 4-20 mA Sunlight

SQ-224 4-20 mA Electric light

SQ-311 Self-powered Sunlight

SQ-321 Self-powered Electric light

SQ-313 Self-powered Sunlight

SQ-323 Self-powered Electric light

SQ-316 Self-powered Sunlight

SQ-326 Self-powered Electric light

SQ-420 USB Sunlight and Electric light

SQ-421 SDI-12 Sunlight and Electric light

Sensor model number and serial number are located near

the pigtail leads on the sensor cable. If you need the

manufacturing date of your sensor, please contact Apogee

Instruments with the serial number of your sensor.

SPECIFICATIONS

Calibration Traceability

Apogee SQ series quantum sensors are calibrated through side-by-side comparison to the mean of four Apogee model SQ-

110 or SQ-120 transfer standard quantum sensors under high output T5 cool white fluorescent lamps. The transfer standard

quantum sensors are calibrated through side-by-side comparison to the mean of at least three LI-COR model LI-190R

reference quantum sensors under high output T5 cool white fluorescent lamps. The reference quantum sensors are

recalibrated on a biannual schedule with a LI-COR model 1800-02 Optical Radiation Calibrator using a 200 W quartz halogen

lamp. The 1800-02 and quartz halogen lamp are traceable to the National Institute of Standards and Technology (NIST).

SQ-212/SQ-222

SQ-215/SQ-225

Power Supply 3.3-24 V DC with a nominal current

draw of 300 µA

5.5-24 V DC** with a nominal current

draw of 300 µA

**Sensors with a serial number smaller than 3762

should not be powered with more than 5 V DC

Sensitivity 1.0 mV per µmol m-2 s-1 2.0 mV per µmol m-2 s-1

Calibration Factor

(Reciprocal of Sensitivity) 1.0 µmol m-2 s-1 per mV 0.5 µmol m-2 s-1 per mV

Calibrated Output Range 0 to 2.5 V 0 to 5.0 V

Calibration Uncertainty ± 5 % (see Calibration Traceability below)

Measurement Repeatability Less than 0.5 %

Long-term Drift

(Non-stability)

Less than 2 % per year

Non-linearity

Less than 1 % (up to 2500 µmol m-2 s-1;

maximum PPFD measurement is 2500 µmol m

-2

-1

)

Response Time Less than 1 ms

Field of View 180º

Spectral Range

410 to 655 nm (wavelengths where response is greater than 50 % of maximum; see

Spectral Response below)

Spectral Selectivity Less than 10 % from 469 to 653 nm

Directional (Cosine) Response ± 5 % at 75º zenith angle (see Cosine Response below)

Temperature Response 0.06 ± 0.06 % per C (see Temperature Response below)

Operating Environment

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

of 30 m

Dimensions 24 mm diameter; 28 mm height

Mass 90 g (with 5m of lead wire)

Cable

5 m of two conductor, shielded, twisted-pair wire; additional cable available in

multiples of 5 m; santoprene rubber jacket (high water resistance, high UV

stability, flexibility in cold conditions); pigtail lead wires

Spectral Response

Temperature Response

Mean temperature response of eight SQ series

quantum sensors (errors bars represent two

standard deviations above and below mean).

Temperature response measurements were

made at 10 C intervals across a temperature

range of approximately -10 to 40 C in a

temperature controlled chamber under a fixed,

broad spectrum, electric lamp. At each

temperature set point, a spectroradiometer was

used to measure light intensity from the lamp

and all quantum sensors were compared to the

spectroradiometer. The spectroradiometer was

mounted external to the temperature control

chamber and remained at room temperature

during the experiment.

Mean spectral response of six SQ series quantum

sensors (error bars represent two standard

deviations above and below mean) compared to

PPFD weighting function. Spectral response

measurements were made at 10 nm increments

across a wavelength range of 300 to 800 nm in a

monochromator with 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.

Cosine Response

Mean cosine response of twenty-three SQ

series quantum sensors (error bars

represent two standard deviations above

and below mean). Cosine response

measurements were made by direct side-

by-side comparison to the mean of four

reference thermopile pyranometers, with

solar zenith angle-dependent factors

applied to convert total shortwave

radiation to PPFD. Blue points represent

the AM response and red points represent

the PM response.

Directional, or cosine, response is defined as the

measurement error at a specific angle of radiation

incidence. Error for Apogee SQ series quantum sensors is

approximately ± 2 % and ± 5 % at solar zenith angles of

45° and 75°, respectively.

DEPLOYMENT AND INSTALLATION

Mount the sensor to a solid surface with the nylon mounting screw provided. To accurately measure PPFD incident on a

horizontal surface, the sensor must be level. An Apogee Instruments model AL-100 Leveling Plate is recommended to level

the sensor when used on a flat surface or being mounted to surfaces such as wood. To facilitate mounting on a mast or pipe,

the Apogee Instruments model AL-120 Solar Mounting Bracket with Leveling Plate 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 1 %, 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: 10-32x3/8

Model AL-100

Nylon Screw: 10-32x3/8

Model AL-120

Cable Connectors

Apogee started offering in-line cable connectors on some

bare-lead sensors in March 2018 to simplify the process of

removing sensors from weather stations for calibration by

not requiring the full cable to be uninstalled back to the data

logger.

The ruggedized M8 connectors are rated IP67, made of

corrosion-resistant marine-grade stainless-steel, and

designed for extended use in harsh environmental

conditions.

Inline cable connectors are installed 30 cm from the head

(pyranometer pictured)

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 data

logger connection, we remove the unused pigtail lead colors

at the data logger end of the cable.

If you ever need a replacement cable, please contact us

directly to ensure ordering the proper pigtail configuration.

Alignment: When reconnecting your 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 short

end of the cable and half the connector.

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.

Finger-tighten firmly

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