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SQ-610-SS ePAR Sensor

Make: Apogee                                      Model: SQ-610-SS
✅ Designed to measure the newly defined 400-750 nm ePAR radiation range that research has shown to be photosynthetically active, beyond the traditional 400-700 nm range.
✅ Measurand: Extended photosynthetically active radiation (ePAR)
✅ Sensor Type: Blue-enhanced silicon photodiode
✅ Signal Output: Analog (0 to 40 mV)
✅ Supplied With: 5 m Cable, Factory test/ Calibration Certificates.

SQ-610-SS ePAR Sensor:

Apogee’s newest, cutting-edge ePAR sensor was created in 2021 as an upgrade to our ePFD sensor and is designed to measure the newly defined 400-750 nm ePAR radiation range that research has shown to be photosynthetically active, beyond the traditional 400-700 nm range. The SQ-610 ePAR sensor is a self-powered sensor. The sensor features a rugged, aluminum housing that is fully submersible and built to withstand harsh conditions, as well as high-quality cable terminating in pre-tinned pigtail leads for easy connection to dataloggers and controllers. The sensor cable includes an IP68 marine-grade stainless-steel cable connector to simplify sensor removal and replacement from permanent installations for maintenance and calibration.

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 liketraditional quantum sensors but measure a wider range of wavelengths can be thought of as an ‘extended range’ quantum sensor.

Typical applications of ePAR sensors include measuring total ePAR intensity over plant canopies in all growing environments, monitoring and adjusting grow lights, and researching plant morphogenic activity and photobiology. Many next-generation LED fixtures, the sun, and other light sources emit these newly confirmed far-red photosynthetic wavelengths, but they have not been measurable by traditional 400-700 nm PAR meters until now.

The analog version of this sensor (SQ-610) comes with the inline cable connector placed 30 cm from the sensor head for either standard use as a long-cable pigtail sensor, or for use with our microCache Bluetooth Micro Logger by unscrewing the connector, discarding the long section of cable and then screwing the sensor to the mating connector on the micro Cache.

Application and features of SQ-610-SS ePAR Sensor:



✅ Total ePAR intensity measurements over plant canopies in all growing environments
✅ Monitor and adjust grow lights
✅ Research plant morphogenic activity
✅ Photobiology studies
✅ Accurate, Stable Measurements
✅ High-Quality Cable
✅ Calibration Traceability


Weight (Mass)

140 g


30.5 mm diameter, 37 mm height

Measurement Range

0 to 4000 µmol m-2 s-1

Operating Temperature

-40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m

Temperature Response

-0.11 ± 0.04 % per C

Cable Length

5 m of two conductor, shielded, twisted-pair wire; TPR jacket; pigtail lead wires; stainless steel (316), M8 connector located 25 cm from sensor head

Field Of View


Protection Level



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