Apogee Instruments SQ-622 User manual

APOGEE INSTRUMENTS, INC. | 721 WEST 1800 NORTH, LOGAN, UTAH 84321, USA
TEL: [phone] | FAX: [phone] | WEB: APOGEEINSTRUMENTS.COM
Copyright © 2021 Apogee Instruments, Inc.
OWNER’S MANUAL
EXTENDED RANGE PFD SENSOR
Models SQ-622 and SQ-625
Rev: 28-Oct-2020

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 .................................................................................................................................................. 9
Maintenance and Recalibration............................................................................................................................................. 12
Troubleshooting and Customer Support................................................................................................................................ 13
Return and Warranty Policy................................................................................................................................................... 14

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-622, SQ-625
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, January 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. SQ-620 models output an
analog signal that is directly proportional to photon flux density. The analog 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 the amplified voltage output Extended Range PFD Sensors, models SQ-622 and SQ-625 (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-622-SS
SQ-625-SS
Power Supply
5 to 24 V DC
5.5 to 24 V DC
Current Draw
12 V is 57 µA
Sensitivity
0.625 mV per µmol m-2 s-1
1.25 mV per µmol m-2 s-1
Calibration Factor
1.6 µmol m-2 s-1 per mV
0.8 µmol m-2 s-1 per mV
Calibration
Uncertainty
± 5 % (see Calibration Traceability below)
Output Range
0 to 2.5 V
0 to 5 V
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
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 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

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
or recording a millivolt signal (an input measurement range of approximately 0-2.5 V (SQ-622) or 0-5 V (SQ-625) is
required to cover the entire range of PFD from the sun). To maximize measurement resolution and signal-to-noise
ratio, the input range of the measurement device should closely match the output range of the extended range
PFD sensor. DO NOT connect the sensor to a power source greater than 24 V DC.
Wiring for SQ-622 and SQ-625
White: Positive (signal from sensor)
Red: Input power (SQ-622 5-24 V DC, SQ-625 5.5-
24 V DC)
Black: Ground (for sensor signal and input power)
Clear: Shield/Ground

Sensor Calibration
Apogee SQ-622 and SQ-625 Extended Range PFD Sensors have standard calibration factors of exactly:
SQ-622: 1.6 µmol m-2 s-1 per mV
SQ-625: 0.8 µmol m-2 s-1 per mV
Multiply the calibration factor by the measured mV signal to convert sensor output to photon flux density in units
of µmol m-2 s-1:
Calibration Factor (0.8 µmol m-2 s-1 per mV) * Sensor Output Signal (mV) = Photon Flux Density (µmol m-2 s-1)
0.8 * 2500 = 2000
Example of photon flux density measurement with an
Apogee model Extended Range PFD sensor. The LED in this
example Full yields a photon flux density on a horizontal
plane of 2000 µmol m-2 s-1. This yields an output signal of
2500 mV for the 0-5 V option or an output signal of 1250
mV for the 0-2.5 V option. This signal is converted to
photon flux density by multiplying by the calibration factor.
SQ-622 Sensor Output: 1250 mV
Conversion Factor: 1.6 µmol m-2 s-1 per mV
SQ-625 Sensor Output: 2500 mV
Conversion Factor: 0.8 µmol m-2 s-1 per mV
LED Output
(2000 µmol m-2s-1)

MAINTENANCE AND RECALIBRATION
Dust or organic deposits are best removed using water or window cleaner and a soft cloth or cotton swab. Salt
deposits should be dissolved with vinegar and removed with a soft cloth or cotton swab.
Blocking of the optical path between the target and detector can cause low readings. Occasionally, accumulated
materials on the diffuser of the upward-looking radiometer and in the apertures of the downward-looking
radiometer can block the optical path in three common ways:
1. Moisture or debris on the diffuser (upward-looking) or in the apertures (downward-looking).
2. Dust during periods of low rainfall.
3. Salt deposit accumulation from evaporation of sea spray or sprinkler irrigation water.
Apogee Instruments upward-looking sensors have a domed diffuser and housing for improved self-cleaning from
rainfall, but active cleaning may be necessary. Dust or organic deposits are best removed using water, or window
cleaner, and a soft cloth or cotton swab. Salt deposits should be dissolved with vinegar and removed with a cloth
or cotton swab. Salt deposits cannot be removed with solvents such as alcohol or acetone. Use only gentle
pressure when cleaning the diffuser with a cotton swab or soft cloth, to avoid scratching the outer surface. The
solvent should be allowed to do the cleaning, not mechanical force. Never use an abrasive material or cleaner on
the diffuser.
It is recommended that two-band radiometers be recalibrated every two years. See the Apogee webpage for
details regarding return of sensors for recalibration (http://www.apogeeinstruments.com/tech-support-
recalibration-repairs/).

TROUBLESHOOTING AND CUSTOMER SUPPORT
Independent Verification of Functionality
Apogee SQ-622 and SQ-625 Extended Range PFD Sensors provide an amplified voltage output that is proportional
to incident photon flux density for the 340-1040 nm wavelength range. A quick and easy check of sensor
functionality can be determined using a DC power supply and a voltmeter. Power the sensor with a DC voltage by
connecting the positive voltage signal to the red wire from the sensor and the negative (or common) to the black
wire from the sensor. Use the voltmeter to measure across the white wire (signal output) and black wire (signal
ground). Direct the sensor head toward a light source and verify the sensor provides a signal. Increase and
decrease the distance from the sensor head to the light source to verify that the signal changes proportionally
(decreasing signal with increasing distance and increasing signal with decreasing distance). Blocking all radiation
from the sensor should force the sensor signal to zero.
Compatible Measurement Devices (Dataloggers/Controllers/Meters)
SQ-600 Extended Range PFD Sensors are calibrated with a standard calibration factor of 1.6 µmol m-2 s-1 per mV
(SQ-622) or 0.8 µmol m-2 s-1 per mV (SQ-625), yielding a sensitivity of 0.6 mV per µmol m-2 s-1 (SQ-622) or 1.3 mV
per µmol m-2 s-1 (SQ-625). Thus, a compatible measurement device (e.g., datalogger or controller) should have
resolution of at least 0.6 mV (SQ-622) or 1.3 mV (SQ-625) in order to provide photon flux density resolution of 1
µmol m-2 s-1.
An example datalogger program for Campbell Scientific dataloggers can be found on the Apogee webpage at
https://www.apogeeinstruments.com/downloads/#datalogger.
Cable Length
When the sensor is connected to a measurement device with high input impedance, sensor output signals are not
changed by shortening the cable or splicing on additional cable in the field. Tests have shown that if the input
impedance of the measurements device is greater than 1 mega-ohm there is negligible effect on the calibration,
even after adding up to 100 m of cable. All Apogee sensors use shielded, twisted pair cable to minimize
electromagnetic interference. For best measurements, the shield wire must be connected to an earth ground. This
is particularly important when using the sensor with long lead lengths in electromagnetically noisy environments.
Modifying Cable Length
See Apogee webpage for details on how to extend sensor cable length:
(http://www.apogeeinstruments.com/how-to-make-a-weatherproof-cable-splice/).

RETURN AND WARRANTY POLICY
RETURN POLICY
Apogee Instruments will accept returns within 30 days of purchase as long as the product is in new condition (to be
determined by Apogee). Returns are subject to a 10 % restocking fee.
WARRANTY POLICY
What is Covered
All products manufactured by Apogee Instruments are warranted to be free from defects in materials and craftsmanship
for a period of four (4) years from the date of shipment from our factory. To be considered for warranty coverage an
item must be evaluated by Apogee.
Products not manufactured by Apogee (spectroradiometers, chlorophyll content meters, EE08-SS probes) are covered
for a period of one (1) year.
What is Not Covered
The customer is responsible for all costs associated with the removal, reinstallation, and shipping of suspected warranty
items to our factory.
The warranty does not cover equipment that has been damaged due to the following conditions:
1. Improper installation or abuse.
2. Operation of the instrument outside of its specified operating range.
3. Natural occurrences such as lightning, fire, etc.
4. Unauthorized modification.
5. Improper or unauthorized repair.
Please note that nominal accuracy drift is normal over time. Routine recalibration of sensors/meters is considered part of
proper maintenance and is not covered under warranty.
Who is Covered
This warranty covers the original purchaser of the product or other party who may own it during the warranty period.
What Apogee Will Do
At no charge Apogee will:
1. Either repair or replace (at our discretion) the item under warranty.
2. Ship the item back to the customer by the carrier of our choice.
Different or expedited shipping methods will be at the customer’s expense.
How To Return An Item
1. Please do not send any products back to Apogee Instruments until you have received a Return Merchandise

APOGEE INSTRUMENTS, INC. | 721 WEST 1800 NORTH, LOGAN, UTAH 84321, USA
TEL: [phone] | FAX: [phone] | WEB: APOGEEINSTRUMENTS.COM
Copyright © 2021 Apogee Instruments, Inc.
Authorization (RMA) number from our technical support department by submitting an online RMA form at
www.apogeeinstruments.com/tech-support-recalibration-repairs/. We will use your RMA number for tracking of the
service item. Call [phone] or email [e-mail] with questions.
2. For warranty evaluations, send all RMA sensors and meters back in the following condition: Clean the sensor’s exterior
and cord. Do not modify the sensors or wires, including splicing, cutting wire leads, etc. If a connector has been attached
to the cable end, please include the mating connector –otherwise the sensor connector will be removed in order to
complete the repair/recalibration. Note: When sending back sensors for routine calibration that have Apogee’s standard
stainless-steel connectors, you only need to send the sensor with the 30 cm section of cable and one-half of the
connector. We have mating connectors at our factory that can be used for calibrating the sensor.
3. Please write the RMA number on the outside of the shipping container.
4. Return the item with freight pre-paid and fully insured to our factory address shown below. We are not responsible for
any costs associated with the transportation of products across international borders.
Apogee Instruments, Inc.
721 West 1800 North Logan, UT
84321, USA
5. Upon receipt, Apogee Instruments will determine the cause of failure. If the product is found to be defective in terms
of operation to the published specifications due to a failure of product materials or craftsmanship, Apogee Instruments
will repair or replace the items free of charge. If it is determined that your product is not covered under warranty, you
will be informed and given an estimated repair/replacement cost.
PRODUCTS BEYOND THE WARRANTY PERIOD
For issues with sensors beyond the warranty period, please contact Apogee at [email protected] to
discuss repair or replacement options.
OTHER TERMS
The available remedy of defects under this warranty is for the repair or replacement of the original product, and Apogee
Instruments is not responsible for any direct, indirect, incidental, or consequential damages, including but not limited to
loss of income, loss of revenue, loss of profit, loss of data, loss of wages, loss of time, loss of sales, accruement of debts
or expenses, injury to personal property, or injury to any person or any other type of damage or loss.
This limited warranty and any disputes arising out of or in connection with this limited warranty ("Disputes") shall be
governed by the laws of the State of Utah, USA, excluding conflicts of law principles and excluding the Convention for the
International Sale of Goods. The courts located in the State of Utah, USA, shall have exclusive jurisdiction over any
Disputes.
This limited warranty gives you specific legal rights, and you may also have other rights, which vary from state to state
and jurisdiction to jurisdiction, and which shall not be affected by this limited warranty. This warranty extends only to
you and cannot by transferred or assigned. If any provision of this limited warranty is unlawful, void or unenforceable,
that provision shall be deemed severable and shall not affect any remaining provisions. In case of any inconsistency
between the English and other versions of this limited warranty, the English version shall prevail.
This warranty cannot be changed, assumed, or amended by any other person or agreement