Apogee Instruments QUANTUM MQ-301X 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

APOGEE LINE QUANTUM

Models MQ-301X and SQ-301X

Rev: 5-May-2022

TABLE OF CONTENTS

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: MQ-301X, SQ-301X

Type: Line Quantum

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, May 2022

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.

The acronym PPF is also widely used and refers to the photosynthetic photon flux. The acronyms PPF and PPFD

refer to the same parameter. The two terms have co-evolved because there is not a universal definition of the

term “flux”. Some physicists define flux as per unit area per unit time. Others define flux only as per unit time.

We have used PPFD in this manual because we feel that it is better to be more complete and possibly redundant.

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 MQ-301X line quantum consists of a separated sensor bar with 10 sensors connected to a

hand-held meter via cable. The SQ-301X line quantum consists of the sensor bar with 10 sensors and pre-tinned

pigtail leads. The sensor housing design features an integrated bubble level to ensure level deployment. The

sensors consist of a cast acrylic diffuser (filter) and photodiode, and the sensors are potted solid with no internal

air space. The meter provides a real-time PPFD reading on the LCD display and offers measurements for both

sunlight and electric light calibrations (menu selectable) that determine the radiation incident on a planar surface

(does not have to be horizontal), where the radiation emanates from all angles of a hemisphere. MQ X series line

quantum meters include manual and automatic data logging features for making spot-check measurements or

calculating daily light integral (DLI).

SENSOR MODELS

The Apogee MQ-310X line quantum meter covered in this manual is self-contained and comes complete with a

handheld meter and line of 10 sensors. The SQ-301X line quantum sensor comes with a line of 10 sensors and pre-

tinned pigtail leads.

Line quantum sensors provide spatially averaged PPFD measurements. All sensors along the length of the line are

connected in parallel, and as a result, Apogee line quantum meters display PPFD values that are averaged from the

location of the individual sensors.

A meter’s model number and serial number are

located on a label on the backside of the handheld

meter.

SQ-310X: Line quantum with 10 sensors and

cable with pre-tinned pigtail leads

MQ-310X: Line quantum with 10 sensors and

handheld meter

A sensor’s 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 SQX series quantum sensors are calibrated through side-by-side comparison to the mean of four transfer

standard quantum sensors under a reference lamp. The reference quantum sensors are recalibrated with a 200 W

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

MQ-301X

SQ-301X

Sensitivity

0.1 mV per µmol m-2 s-1

Calibrated Output

Range

0 to 250 mV

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)

Response Time

Less than 1 ms

Field of View

180°

Spectral Range

370 to 650 nm (wavelengths where response is greater than 50 % of maximum;

see Spectral Response graph)

Directional (Cosine)

Response

± 5 % at 75° zenith angle (see Cosine Response graph)

Temperature

Response

-0.04 % per C

Operating

Environment

-10 to 60 C; 0 to 100 % relative humidity; sensor can be submerged in water up to

depths of 30 m

Meter Dimensions

113.9 mm height; 59.9 mm width

Sensor Dimensions

616.4 mm length, 13.6 mm height, 16.5 mm width

Mass

460 g

310 g

Cable

2 m of shielded, twisted-pair wire; TPR

jacket (high water resistance, high UV

stability, flexibility in cold conditions)

5 m of two conductor, shielded, twisted-

pair wire; TPR jacket; pigtail lead wires;

stainless steel, M8 connector located 25

cm from sensor head

Spectral Response

Mean spectral response of four SQ-100X

series quantum sensors compared to PPFD

weighting function. Spectral response

measurements were made at 10 nm

increments across a wavelength range of

350 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

Directional (cosine) response is defined as

the measurement error at a specific angle of

radiation incidence. Error for Apogee SQ-

100X series quantum sensors is

approximately ± 2 % and ± 5 % at solar zenith

angles of 45° and 75°, respectively.

Mean cosine response of five SQ-

100X series quantum sensors.

Cosine response measurements

were made by direct side-by-side

comparison to the mean of seven

reference SQ-500 quantum

sensors.

DEPLOYMENT AND INSTALLATION

Apogee MQ X series line quantums are designed for spot-check measurements, and calculation of daily light

integral (DLI; total number of photons incident on a planar surface over the course of a day) through the built-in

logging feature. To accurately measure PFFD incident on a horizontal surface, the sensor bar must be level.

Line quantum sensors are leveled using the built-in bubble level located in the handle of the sensor. In addition to

leveling, all sensors should also be mounted such that obstructions (e.g., weather station tripod/tower or other

instrumentation) do not shade the sensor.

NOTE: The handheld meter portion of the instrument is not waterproof. Do not get the meter wet or leave the

meter in high humidity environments for prolonged periods of time. Doing so can lead to corrosion that could void

the warranty.

BATTERY INSTALLATION AND REPLACEMENT

Use a Phillips head screwdriver to remove the screw from the battery cover on the meter. Remove the battery

cover by slightly lifting and sliding the outer edge of the cover away from the meter.

To power the meter, slide the included battery (CR2320) into the battery holder, after removing the battery door

from the meter’s back panel.

The positive side (designated by a “+” sign) should be facing out from the meter circuit board.

NOTE: The battery cradle can be damaged by using an incorrectly sized battery. If the battery cradle is damaged,

the circuit board will need to be replaced and the warranty will be void. To avoid this costly problem, use only a

CR2320 battery.

Battery Removal

Press down on the battery with a screwdriver or similar object. Slide battery out.

If the battery is difficult to move, turn the meter on its side so that the opening for the battery is facing downward

and tap the meter downward against an open palm to dislodge the battery enough so that it can be removed with

your thumb to slide the battery out of the battery holder.

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