The PQS1 PAR Quantum sensor is developed for accurate measurement of PAR. It offers a response with an excellent match to the ideal PAR response. In addition, the optical design of the diffuser offers optimised cosine correction. The instrument is designed for continuous outdoor or indoor installation, perfect for studies of crop growth in greenhouses for example.

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PQS1 Horticultural Sensor

Key features

  • For measuring Photosynthetic Active Radiation
  • For outdoor and indoor use
  • Excellent Quantum response
  • 5 year warranty (*)
  • Integrated levelling base

Both solar radiation and artificial light sources, like high pressure sodium lamps for example, are common sources of Photosynthetic Active Radiation.

The PQS1's sensitivity has been optimised to provide reliable and accurate measurements regardless of the PAR source. This is important for horticultural studies and plant physiology monitoring.

The mounting flange incorporates a bubble level and adjustment screws, for easy levelling. A threaded hole takes the accessory screw-in mounting rod for fitting to masts and poles. Two PQS1 sensors can easily be bolted back-to-back, and fitted with the mounting rod, to make a simple PAR albedometer. The standard cable length is 5m, with an option of 15m. The PQS1 is ideal for use with the METEON handheld display and data logger for field test use.

(*) This product will need to be registered by the end-user within 6 months of purchase to activate the 5 year warranty.

Technical specification

Spectral range (50% points) 400 to 700 nm ± 4 nm
Sensitivity 4 to 10 µV/µmol/m²·s
Impedance 240 Ω
Response time (95%) < 1 µs
Non-stability (change/year) < 2 %
Non-linearity (0 to 10,000 µV/µmol/m²·s) < 1 %
Directional response (up to 80° with 1000 µmol/m²·s beam) < 30 µmol/m²·s
Temperature response < -0.12
Field of view 180 °
Operational temperature range -30 °C to +70 °C

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