The LP…01 series allows measurement of Photometric and Radiometric quantities such
as illuminance (lux), irradiance (W/m2) across VIS-NIR, UVA, UVB, UVC spectral regions, as
well as the number of photons received per unit time on a unit area, in the Photosynthetical
Active Radiation (PAR) wavelength range from 400nm - 700nm.
In LP….01 probes, there is no need for external power supply. Output signal in mV is
given through a resistor shunting the photodiode ends. Photocurrent generated by the
photodiode when hit by light, is converted to a potential difference, which is read by a
voltmeter. Once the DDP (Potential Difference) has been read, the measured value can
be calculated through the calibration factor. All probes are individually calibrated and
the calibration factor is shown both on the probe housing and on the user manual
and is specific to that probe. LP…01 probes are equipped with cosine corrected diffuser.
In probes for UV measurements the diffuser is made of sanded quartz, for the other
probes, the diffuser is commonly made of acrylic material or teflon® (LP PHOT 01). LP ...
.01 probes are suitable for applications in-door which requires the constant monitoring
of the quantities specified. The output signal can be amplified or converted into a
4÷20mA or 0÷10Vdc signal by using a converter of the series HD978TR3 (4÷20mA) and
HD978TR4 (0÷10Vdc) for DIN rail attachment, or the wall mounting types HD978TR5
(4÷20mA) and HD978TR6 (0÷10Vdc).
Installing the probes
Once you have chosen where to install the probe, you must provide the connections
between the probe and the voltmeter; the volmeter must have proper scales of measurement.
The connection diagram of the probe output cables is shown in the user manual.
For measurements in weather and agriculture stations or in nursery-gardening systems,
the probe reference plane should be mounted parallel to the ground; in this case, the
probe shall be mounted on a LP BL (optional) support provided with bubble level.
LP PAR 01 probe measures the ratio between the number of photons that strike a surface
in one second, in the 400nm - 700nm spectral range and the surface area (m2). This
quantity is defined as PAR: Photosynthetically Active Radiation.
The probe calibration is carried out by using an alogen lamp, with a known spectral
irradiance in a specific spectral range.
Temperature slightly affects the probe spectral response.
The diffuser and the probe particular structure, allow the response to the variation of the
light incidence angle on the diffuser, to be cosine corrected
TECHNICAL SPECIFICATIONS
Typical sensitivity: 30 μV/(μmol/(m-2s-1)
Measuring range: 0-5000 (μmol/(m-2s-1)
Typical spectral range: 400 nm ÷ 660 nm
Calibration accuracy:
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