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Enabling better global research outcomes in soil, plant & environmental monitoring.

SKL 2620 High Output PAR Sensor

The SKL 2620 PAR Quantum sensor incorporates an amplifier to give full scale outputs of 1, 2, 3, 4, 5 or 10 volts.

The Skype PAR Quantum sensor is used to measure photon irradiance, or quantity of PAR light.

The SKL 2620 is suitable for use in natural solar radiation or any lamp or light source. The sensor is fully waterproof and guaranteed submersible to 4m depth. Indoor versions are also available.

Sensor Output/Power
Supply Requirements
Output Power Supply
0-1V, 0-2V, 0-3V 5-15V
0-4V 6-15V
0-5V 7-15V
0-10V 12-15V

The current consumption of the sensor is very low, typically 1 mA. This means it can be powered from a logic high output of some computer cards and PLCs.

Sensor output is linear with increasing light levels and will rise to a maximum value, usually well above the output level specified on the calibration certificate. The built-in amplifier will increase its output linearly with increasing light levels up to an output voltage about 2 volts less than its supply.

Typical Sensor Output:

Sensor Description Sensor Output Working Range Typical Summer Day Value
SKL 2620 PAR Quantum 0-1V 0-3000 µmol m-2 s-1 >2000 µmol m-2 s-1
Response Time 10ns
Detector Blue enhanced silicon photocell. Low fatigue characteristics.
Filters Optical Glass
Sensor Cosine corrected head
Cosine Error 3%
Azimuth Error < 1%
Temperature Coefficient +0.1%/°C
Linearity Error < 0.2%
Absolute Calibration Error Typically < 3%, 5% maximum.
Operating Environment -35 to +75°C, 0-100% RH
Cable 2 core screened DEF std 61-12/4.5
Construction Material Dupont ‘Delrin’ fully sealed to IP68
Weight 400g

SKL2620 Response

Each SKL 2620 sensor has been calibrated against a reference lamp, whose own calibration has been carried out at the National Physical Laboratory (NPL). They are calibrated for use with any natural or artificial light source.

Linearity is excellent with a maximum of 1% deviation up to levels beyond 200,000 µmol m-2 s-1 (greater than normal solar irradiance).

The SKL 2620 is a High Output Light Sensor (HOPL), with a built in amplifier with a choice of outputs for compatibility with most dataloggers, data acquisition systems, controllers and PLCs. Outputs are available in a range of voltages, please specify which voltage you require.

These sensors are cosine corrected, which means that they accept incoming light according to Lambert’s Cosine Law. Essentially, this means that light is measured from the hemisphere directly above the sensor.