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| Brand | Apogee Instruments |
|---|---|
| Origin | USA (Manufactured in Logan, UT) |
| Model | SI-111 |
| Output Type | Analog Voltage (Non-Amplified) |
| Field of View | 22°30′ |
| Spectral Range | 8–14 µm |
| Measurement Range | −60 °C to +110 °C |
| Calibration Uncertainty | ±0.2 °C (−20 °C to +65 °C) |
| Response Time (95%) | 0.6 s |
| Sensitivity | 60 µV/°C |
| Thermopile Output Range | −3.3 mV to +3.3 mV |
| Thermistor Output Range | 0–2500 mV (excitation-dependent) |
| Excitation Voltage | 2500 mV (typ.) |
| Operating Environment | −55 °C to +80 °C, 0–100% RH (non-condensing) |
| Housing | Marine-grade stainless steel (IP68 connector at sensor head) |
| Dimensions | Ø23 mm × 60 mm |
| Mass | 190 g (incl. 5 m cable) |
| Cable | 5 m, 4-conductor, shielded twisted-pair, TPR jacket (UV-stable, hydrophobic, low-temp flexible) |
| Long-term Drift | <2% per year (with clean germanium window) |
| Warranty | 4 years |
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