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Apogee Instruments SQ-642, Owner'S Manual

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Apogee Instruments SQ-642 Owner'S Manual Download Page 5

SENSOR MODELS 

This manual covers the amplified voltage output models SQ-642 and SQ-645 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. 

Summary of Contents for SQ-642

Page 1: ...721 WEST 1800 NORTH LOGAN UTAH 84321 USA TEL 435 792 4700 FAX 435 787 8268 WEB APOGEEINSTRUMENTS COM Copyright 2021 Apogee Instruments Inc OWNER S MANUAL QUANTUM LIGHT POLLUTION SENSOR Models SQ 642 and SQ 645 Rev 4 Oct 2021 ...

Page 2: ...e 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 ...

Page 3: ...ent 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 polybro...

Page 4: ...uantum 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 t...

Page 5: ...ered 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 ...

Page 6: ...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 200 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 b...

Page 7: ...ely 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 monoch...

Page 8: ...ounted 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 n...

Page 9: ...ee 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 ...

Page 10: ...er 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 642 and SQ 645 White Positive signal from sensor Red Input power SQ 642 5 24 V DC SQ 645 5 5 24 V DC Black ...

Page 11: ...2 s 1 0 08 1250 100 Example of photon flux density measurement with an Apogee model Quantum Light Pollution Sensor The LED in this example Full yields a photon flux density on a horizontal plane of 100 µmol m 2 s 1 This yields an output signal of 1250 mV for the 0 2 5 V option or an output signal of 2500 mV for the 0 5 V option This signal is converted to photon flux density by multiplying by the ...

Page 12: ... SQ 620 Extended Range Quantum Sensor can measure a photon flux density range of 0 4000 mol m 2 s 1 The model SQ 640 Quantum Light Pollution Sensor is designed for low light measurements and can only measure a photon flux density range of 0 200 mol m 2 s 1 the sensor will output values beyond 200 mol m 2 s 1 but these are beyond the linear range of the sensor and is referred to as the low light ve...

Page 13: ...ed 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 clea...

Page 14: ...ctor of 0 08 µmol m 2 s 1 per mV SQ 642 or 0 04 µmol m 2 s 1 per mV SQ 645 yielding a sensitivity of 12 5 mV per µmol m 2 s 1 SQ 642 or 25 mV per µmol m 2 s 1 SQ 645 Thus a compatible measurement device e g datalogger or controller should have resolution of at least 12 5 mV SQ 642 or 25 mV SQ 645 in order to provide photon flux density resolution of 1 µmol m 2 s 1 An example datalogger program for...

Page 15: ...al 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 no...

Page 16: ... 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 techsupport ap...

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