#### Infrared Radiometer Sensor :

Apogee Instruments Infrared Radiometers (IRRs) measure surface temperature by converting thermal energy radiated from any surface in its field-of-view (FOV) to an electrical signal with a response time less than 1 second. Each IRR carries an impressive uncertainty of 0.2°C at 95% confidence to ensure accurate measurements. The resilient 8-14 µm germanium window corresponds to the atmospheric window in order to minimize the effects of water bands below 8 µm and above 14 µm.

**The Meter has following special features :**

- Most accurate infrared radiometer on the market
- Measures surface temperature rapidly
- Uncertainty of 0.3°C (95% confidence)
- 8-14 µm germanium atmospheric window
- 8-14 µm germanium atmospheric window
- Radiation shield included
- Multiple field of view (FOV) options
- Calibrated target temperature range from -30 to 65°C
- Rugged and lightweight
- Four year warrant

**Model**

SI-111

SI-121

SI-131

SI-1H1

SI-411

SI-421

SI-431

SI-4H1

**Specification :**

Spectral Range: 8 to 14 µm; atmospheric window Measurement Repeatability: < 0.05 C Stability (Long-term Drift): less than 2 % change in slope per year Response Time: 0.2 s Field of View: SI-111 – 22° half angle SI-121 – 18° half angle SI-131 – 14° half angle SI-1H1 – 32° horizontal half angle; 13° vertical half angle SI-411 – 22° half angle SI-421 – 18° half angle SI-431 – 14° half angle SI-4H1 – 32° horizontal half angle; 13° vertical half angle

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