Menu Close

SQ-100X-SS Original Quantum Sensor

Make: Apogee                                      Model: SQ-100X
✅ Tool of choice for researchers and agricultural professionals measuring photosynthetically active radiation (PAR) all over the world.
✅ Measurand: Photosynthetically active radiation(PAR)
✅ Sensor Type: Blue-enhanced silicon photodiode
✅ Signal Output: Analog (0 to 250 mV)
✅ Supplied With: 5 m cable, Factory test/ Calibration Certificates.

SQ-100X-SS Original Quantum Sensor:

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 SQ-100X-SS is a self-powered, analog original quantum sensor with a 0 to 250 mV output. The sensor features a rugged, self-cleaning sensor housing design and high-quality cable terminating in pre-tinned pigtail leads for easy connection to dataloggers and controllers. Typical applications include PPFD (photosynthetic photon flux density) measurement over plant canopies in outdoor environments, greenhouses, and growth chambers, and reflected or under-canopy (transmitted) PPFD measurements in the same environments.

Quantum sensors are also used in aquatic environments to measure PAR (photosynthetically active radiation) and PPFD, such as in saltwater aquariums where corals are grown. To facilitate sensor removal and replacement for maintenance and calibration, the sensor includes an IP68 marine-grade stainless-steel cable connector 30 cm from the head.

The analog version of this sensor (SQ-100X-SS) 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 micro Cache 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-100X-SS Original Quantum Sensor:



✅ Applied to plant photosynthesis research, vegetation index research, etc.
✅ Greenhouse Monitoring
✅ Agricultural production
✅ Accurate, Stable Measurements
✅ Typical PPFD Measurement
✅ Calibration Traceability




Weight (Mass)

90 g


24 mmdiameter, 33 mm height


0.1 mV per μmol m⁻² s⁻¹ , 0 to 250 mV

Operating Temperature

-10 to +60 C; 0 to 100 % relative humidity; can be submerged in water up to 30 m

Temperature Response

-0.04 % per C

Cable Length

5 m of two conductor, shielded, twisted-pair wire; TPR jacket (high water resistance, high UV stability, flexibility in cold conditions); pigtail lead wires; stainless steel (316), M8 connector located 25 cm from sensor head.

Field Of VIew



There are no reviews yet.

Be the first to review “SQ-100X-SS Original Quantum Sensor”

Your email address will not be published. Required fields are marked *

Quote SQ-100X-SS Original Quantum Sensor