µSmart Solar Radiation Sensors - SR2 & PR1

Esis Pty Ltd - Australia - Ph 02 9481 7420  Fax 02 9481 7267  www.esis.com.au 
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The Monitor Sensors Solar Radiation Sensors have been designed to meet specific application needs.

The SR2 is a Solar Radiation shortwave (global) spectrum sensor with a spectral response from 400 to 950 nanometres. This is used to record sunshine hours or total incident solar energy.

The PR1 Photosynthetic Active Radiation (PAR) Sensor has a similar construction to the SR2 but with a spectral response range from 400 to 700 nanometres.
The PR2 measures light interception matching that of photosynthesis. This sensor can be used above or within a canopy or crop in daylight or under artificial lighting (glasshouses etc).

Through the use of a shaped Teflon diffuser, in which is housed the photovoltaic sensor, the sensors are able to correct for the changing angle of incidence as the sun moves across the sky.
The “cosine correction” follows the theoretical spectral curve to within 2%. Under clear daylight conditions, the SR2 sensor perform in close comparison to first class thermopile type pyrranometers, at substantially less cost.

 With both sensors, the sensing element is connected to a µprocessor controlled electronics package, providing a host of features,
such as control and alarm outputs, 16 bit resolution (1 part in 65,000) and software switchable dual output signals.
Each unit is provided with a multi-point calibration curve for maximum accuracy across the range.

With most systems, changeover of a sensor means either recalibration of the system or resetting of parameters in the data logger or other data collection devices.
The µSmart sensor eliminates this requirement as the on-board µprocessor ensures that all sensor types exhibit the same electronic specifications thus; have identical performance characteristics.

Sensors conform to a global algorithm in all output modes and for operation in digital, voltage or current mode,
sensors are supplied with individual calibration certificates to enable software conversion to engineering units.
In serial mode, the sensors report in engineering units and the global algorithm is implemented internally.

Features
· PAR and Global Response Versions
· Cosine Corrected (within 2%)
· Robust Design
· 2 Control/Alarm-output
· Stainless steel body
· Mounting Options Available		 Applications
· Meteorology
· Agriculture and Horticulture
· Irrigation
· Solar Radiation Intensity
· Emergency Services
· Evaporation Calculation

Quality Assurance: Monitor Sensors products are manufactured under third party accredited System ISO9002.

Specifications

Range: Model SR2:  0-2000 w/m²
            Model PR1:  0 - 5 millimols/sec.

Cosine Correction: Within 2% of theoretical spectral curve. Accuracy: +/- 5%
Temperature Range: -20°C to +50°C
Humidity Range: 0% to 100%
Sensor Type: Photovoltaic cell with shaped Teflon cap
Measurement Units: Watts per m²
Reliability: With proper maintenance, an operating lifetime in excess of 5 years is expected.

Dual Output: Serial data ASCII format.
plus, either
     Voltage 0-1 volt OR
     Frequency +5 volt pulse 2-10 Hz
Output Options: 4-20 mA, 0-2.5V, 0-4V, RS232C

Power Supply: 5-28 V DC unregulated
Current Drain: 1 mA

Weight (unpacked): 180 grams
Dimensions: Overall height including spigot 197 mm
Diameter 25 mm

Mounting:
Designed to mount on Monitor Sensors standard cross arm
(product code M10). Alternatively, a ½ inch BSP adaptor is available for fitment to a standard water pipe.

Note: Sensor must be mounted vertically and free from shadow.

Cable Details: Standard product has 0.2 mts of cable.
Longer cable lengths may be ordered - allow $ 2.50/m for additional cable.

Associated Products: AWS1 Automatic Weather Station
AWS2 Farmers Weather Station
TA1 Air Temperature Sensor
RGx Tipping Bucket Rain Gauge
SI8 or SI9 Interface module for RS232
SL1 to SL5 µSmart Logger