The CA2 Laboratory Thermopile allows radiant fluxes to be measured. It is sensitive to radiation from 0.2 to 50 µm, and has a field of view of 10°. The field of view is determined by cylindrical brass housing, that contains a conical reflector and a removable glass window.

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CA2 Laboratory Thermopile

Key features

  • Sensitive to radiation from 0.2 to 50 µm
  • Field of view of 10 °

The thermopile is very suitable for control (ovens) or demonstration (schools) purposes and can be used for reference-measurements.

The CA2 thermopile contains a thermal detector. It responds to the total power absorbed. Because the absorber is coated with Kipp & Zonen Carbon Black paint it is spectrally non-selective.

The thermopile output is a voltage that is proportional to the radiation that is received.

Irradiance measurements are easily affected by convection and thermal radiation losses to the environment. Therefore a glass window can shield the detector. By using this window, the spectral range is limited to 0.3 to 3 µm.

The thermopile is delivered with a calibration certificate.

Technical specification

Spectral range (without window) 0.2 to 50µm
Spectral range (with window) 0.35 to 2.8µm
Sensitivity (Parallel beam on front window) 7 to 20µV/W/m²
Impedance 20 to 200Ω
Expected output range (0 to 1500 W/m²) 0 to 30mV
Maximum operational irradiance 2000 W/m²
Response time (63%) < 6s
Response time (95%) < 18s
Non-linearity (100 to 1000 W/m²) < 1.5%
Field of view 20° (for 90% of the received radiation)
Mounting rod 170 mm long x 10 mm Ø
Detector type Thermopile
Operational temperature range -40°C to +80°C
Storage temperature range -40°C to +80°C
Humidity range 0 to 100% non-condensing
Ingress Protection (IP) rating For use in clean indoor conditions only

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