ZDFD Pyrgeometer
ZDFD
The ZDFD is a pyrgeometer that measures infrared (long-wave) radiation over a spectral range of 4-50 μm with a 180° field of view, using a thermopile sensing element with a silicon arc light filter. It is supplied in the UK by MetSensor UK.
- ✓ Measures long-wave infrared radiation, 4-50 μm spectral range
- ✓ 180° field of view
- ✓ Sensitivity 2-10 μV/(W/m²)
- ✓ Nonlinearity ≤±2% over -250 to +250 W/m²
- ✓ Silicon arc light filter, thermopile sensing element, desiccant window
- ✓ Output as -20 to 0 mV or RS485
Specifications
| Signal output | -20 to 0 mV |
|---|---|
| Sensitivity | 2-10 μV/(W/m²) |
| Impedance | 200-800 Ω |
| Response time | ≤30 s (99% response) |
| Nonlinearity | ≤±2% (-250 to +250 W/m²) |
| Temperature coefficient | ≤±1% (-20 to +50°C) |
| Annual stability | ≤±2% |
| Operating temperature | -40 to +80°C |
| Field of view | 180° |
| Interface | -20 to 0 mV / RS485 |
| Key components | Silicon arc light filter, thermopile sensing element, thermistor, light shield, desiccant window |
| Spectral Range | 4~50μm |
| Nonlinear | ≤±2% (-250~+250 W/m²) |
Applications
- Agrometeorological research
- Soil evapotranspiration measurement
- Meteorological radiation balance
- Radiant heat exchange analysis
- Pavement condition trend monitoring
Frequently asked questions
What does a pyrgeometer measure?+
The ZDFD measures infrared long-wave radiation across a 4-50 μm spectral range, as distinct from the visible/near-infrared solar radiation measured by a pyranometer.
What is the field of view of the ZDFD?+
180°.
What is the operating temperature range?+
-40°C to +80°C.
What output does the ZDFD provide?+
-20 to 0 mV analogue output, or RS485 digital output.
