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LPPAR03 Series – Radiometric Probe for Photons Flow

Brand: Delta OHM S.R.L.

The probe LPPAR03 measures the ratio between the number of photons that strike a surface in one second, in the 400 nm to 700 nm spectral range and the surface area (m²). 

This quantity is defined as PAR: Photo-synthetically Active Radiation.

The probe calibration is carried out by using an halogen lamp, with a known spectral irradiance in a specific spectral range. Temperature slightly affects the probe spectral response.

The probe is designed for outdoor readings. Output, according to the chosen configuration, in μV per μmol m-²s-¹ or 4 to 20 mA or 0 to 10 Vdc normalized output or RS485 MODBUS-RTU output.
  • LPPAR03 = μV/(μmol m-²s-¹) output
  • LPPAR03BL = μV/(μmol m-²s-¹) output + base with levelling device
  • LPPAR03BLAC = output 4 to 20 mA + base with levelling device
  • LPPAR03BLAV = output 0 to 10 V + base with levelling device
  • LPPAR03BLS = RS485 MODBUS-RTU output + base with levelling device
Working temperature -20 to +60 °C. M12 male 4-pole (models with analog output) or 8-pole (model with RS485 MODBUS-RTU output) connector. 

On request, CPM12AA4 (except LPPAR03BLS) or CPM12-8D (only LPPAR03BLS) cable with M12 female connector.

1 - 5 of 5 Part Numbers
LPPAR03
LPPAR03
μV/(μmol m-2s-1) Output
LPPAR03BL
LPPAR03BL
μV/(μmol m-2s-1) Output, Base With Levelling Device
LPPAR03BLAC
LPPAR03BLAC
Base With Levelling Device Output 4…20 mA
LPPAR03BLAV
LPPAR03BLAV
Base With Levelling Device Output 0…10 V
LPPAR03BLS
LPPAR03BLS
RS485 MODBUS-RTU Output, Base With Levelling Device
1 - 5 of 5 Part Numbers

Specifications

Typical Sensitivity

  • 1 to 2.5 μV/(μmol(m-2 s-1))

Typical Spectral Range

  • 400 nm to 700 nm

Calibration Uncertainty

  • < 5 %

f2 (Cosine Response)

  • < 3 %

f3 (Linearity)

  • < 1 %

Operating Temperature

  • -20° C to +60° C

Impedance

  • 0.5 to 1.0 kΩ non-normalized version

Version with Normalized Output 4 to 20 mA

  • 20 mA = 5000 μmol(m-2 s-1)
  • 4 mA = 0 μmol(m-2 s-1)

Version with Normalized Output 0…10 Vdc

  • 10 V = 5000 μmol(m-2 s-1)
  • 0 V = μmol(m-2 s-1)

Version with RS-485 MODBUS-RTU Output

  • 0…5000 μmol(m-2 s-1)

Power Supply

  • 10 to 30 Vdc for version with normalized output 4-20 mA
  • 15 to 30 Vdc for version with normalized output 0 to 10 Vdc
  • 5 to 30 Vdc for version with RS-485 Modbus-RTU output
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