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LPSD18… Series – Sunshine Duration

Make:  Delta Ohm      Model: LPSD18… Series
✅ The LPSD18 performs the measure of radiation with an array of photodiodes arranged in a particular geometry which allows to obtain an accurate measurement in any weather conditions.
✅ Measurand : Sunshine Status and Duration.
✅ Sensor Type : Silicon Photodiode Sensor.
✅ Signal Output : Digital output (RS485 MODBUS-RTU/ SDI-12), Analog output (0…1 Vdc).
✅ Supplied With : 10m cable, Factory test/ Calibration Certificates
                
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SKU: SSD-LPSD18.1-DEL Category:

The Sunshine Duration sensor LPSD18 measures sunshine status and duration. The WMO (World Meteorological Organization) defines the sunshine duration as the time during which the direct solar radiation exceeds the level of 120 W/m².

The LPSD18 performs the measure of radiation with an array of photodiodes arranged in a particular geometry which allows to obtain an accurate measurement in any weather conditions. This solution avoids the use of mechanical moving parts and ensures high reliability in the time. The instrument, besides indicating the presence of sun as required by WMO, measures also direct radiation (SRD), therefore it can be used as a low cost alternative to a pyrheliometer, which use is bound to a solar tracker. The instrument is available in three versions, which difference depends on the type of output:

  • LPSD18.1  – RS485 MODBUSRTU output and volt-free contact output
  • LPSD18.2 – RS485 MODBUSRTU output, analog voltage output 0…1 Vdc, which corresponds to 0…2000 W/m² of direct radiation, and digital output voltage
  • LP SD18.3 SDI12 output and volt-free contact output

The LPSD18 is equipped with a heating element separately powered and galvanically isolated, which prevents the formation of condensation on the glass surface onto which the sensitive elements are.

For cold climates, the above-mentioned versions are available with a second heating element (option R, LP SD18.xR), which prevents the formation of ice and prevents snow from settling.

Make

Delta ohm

Model

LPSD18

General Specification

:-

Weight (Mass)

0.9 kg

Outputs

LPSD18.1 : RS485 MODBUS-RTU, Galvanically isolated contact closed = SRD ≥ 120 W/m2, open= SRD < 120 W/m2
LPSD18.2 : RS485 MODBUS-RTU, Analog output 0…1 V (0…2000 W/m2), Digital output 0…1 V, 1V = SRD ≥ 120 W/m2, 0V = SRD < 120 W/m2
LPSD18.3 : SDI-12, Galvanically isolated contact closed = SRD ≥ 120 W/m2, open= SRD < 120 W/m2

Power Supply

7…30 Vdc

Spectral Range

360…1100 nm

Measuring Range

0…2000 W/m2

Power Consumption

5mA @ 12 V

Response Time

< 1 ms

Operating Environment

Operating Temperature: -40…+80 °C
Internal Temperature Measuring Range, Accuracy: -40…+80 °C, ± 0.5 °C

Protection Level

IP66

Sunshine Duration

Sensitive Elements: 16 Silicon photodiodes
Sunshine Duration Resolution: 1 sec
Threshold Value: 120 W/m2
Accuray of the Measurement of the sunshine duration sensor: Better than 90% on the monthly total
Accuray of the Measurement of direct radiation: Better than 90% on the monthly total

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