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Delta-T SPN1 sunshine pyranometer
The Delta-T SPN1 Sunshine Pyranometer measures global (total) and diffuse horizontal irradiance as well as sunshine duration. It is an affordable alternative to shade-ring pyranometers, pyrheliometers, and traditional sunshine recorders. The SPN1 Sunshine Pyranometer is exceptionally easy to use, works at any latitude, and does not require routine adjustment or polar alignment.
Direct and Diffuse Radiation
The SPN1 Sunshine Pyranometer uses an array of seven miniature thermopile sensors and a computer-generated shading pattern to measure the direct and diffuse components of incident solar radiation. The SPN1 Sunshine Pyranometer computes direct radiation by subtracting the diffuse from the global (total) radiation.
Sunshine Duration
The WMO threshold for bright sunshine is 120 W.m-2 in a plane perpendicular to the direct solar beam. The SPN1 Sunshine Pyranometer uses an algorithm based on the ratio of direct to diffuse radiation, combined with their absolute values, to estimate sunshine duration to within a few percent of the WMO standard.
The SPN1 Sunshine Pyranometer does not need to be adjusted or re-positioned to track the sun — a distinct advantage over devices with shadow rings. There are no complex electro-mechanical assemblies and no burnt paper tracks to interpret.
Outputs and Logging
The SPN1 Sunshine Pyranometer provides two analog voltage outputs for global and diffuse radiation, and a digital output for sunshine duration. The sensor is compatible with the SymphoniePRO Data Logger. The SPN1’s signal output is compatible with SymphoniePRO’s channels 16-19 but depending on your configuration, you may also need a P-SCM card (P-SCM #9132).
This sensor comes with a certificate of calibration and 5m cable. Note that as with all thermopile pyranometers, regularly scheduled maintenance is imperative to achieve the sensor’s specified performance.
Delta-T SPN1 Sunshine Pyranometer (#10535) |
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DESCRIPTION |
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| Sensor type | Thermopile solar radiation sensor |
| Applications |
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| Sensor range | 0W/m2 to 2000W/m2 |
| Spectral range | 400nm to 2700nm |
| Instrument compatibility |
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| Measurement range | Sunshine status threshold: 120W/m2 in the direct beam |
OUTPUT SIGNAL |
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| Sensitivity | Analogue output sensitivity:
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| Linearity | > 99% |
| Stability | Recalibration recommended every 2 years |
| Response time | 100ms (typical) |
| Accuracy | Total (Global) and Diffuse radiation:
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| Output signal range | 0 - 2500mV Sunshine status output:
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| Resolution | 0.6W/m2 = 0.6mV |
PERFORMANCE CHARACTERISTICS |
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| Tilt | Tilt response: Negligible |
| POWER REQUIREMENTS | |
| Supply voltage | 5V - 15V DC |
| Heater supply voltage | 12V - 15V DC |
| Heater supply current | Up to 1.5A |
| Power Required | <30μA (asleep) to 2mA (awake) |
INSTALLATION |
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| Mounting | 3 x M5 tapped holes in base at 108mm dia., 120° spacing |
ENVIRONMENTAL |
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| Operating temperature range | -40 to +70°C (-40 to +158°F) |
| Temperature dependence | Temperature coefficient: 0.02% per °C (typical) |
| Other | Zero offsets:
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PHYSICAL |
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| Connections | RS232 Connector:
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| Weight | 786g (1.73 lb) |
| Dimensions | 126mm dia. x 94mm high (5" dia. x 3.7" high) |
MATERIALS |
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| Enclosure | Environmental sealing: IP67 |
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