ZPAR Quantum Sensor
ZPAR
The ZPAR is a quantum sensor that measures photosynthetically active radiation (PAR) across the 400-700 nm spectral range using a silicon light detector with an optical filter, requiring no external power. It is supplied in the UK by MetSensor UK.
- ✓ Measures PAR across 400-700 nm spectral range
- ✓ Self-powered, no external power input required
- ✓ Response time of 1 second (99%)
- ✓ Cosine correction up to 80° incidence angle
- ✓ Silicon light detector with optical filter
- ✓ Output as 0-50 mV or RS485
Specifications
| Spectral range | 400-700 nm |
|---|---|
| Response time | 1 s (99%) |
| Temperature coefficient | Max 0.05%/°C |
| Cosine correction | Up to 80° incidence angle |
| Operating temperature | -40 to 65°C |
| Relative humidity | 0-100% |
| Sensitivity | 5-50 μmol/m²s |
| Internal resistance | 1 kΩ |
| Output signal | 0-50 mV or RS485 |
| Power requirement | No power input required |
| Detection method | Silicon light detector with optical filter |
| Temperature Related | max. 0.05%/℃ |
Applications
- Agrometeorology
- Crop growth monitoring
Frequently asked questions
What is PAR and why is it measured?+
Photosynthetically active radiation (PAR) is the 400-700 nm band of light used by plants for photosynthesis. Measuring it, as the ZPAR does, helps quantify light available for crop growth.
Does the ZPAR need a power supply?+
No, it generates its own signal and requires no external power input.
What incidence angle does the cosine correction cover?+
Up to 80°.
What is the operating temperature range?+
-40°C to 65°C.
