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CHP 1 Pyrheliometer. Quartz window, integrated alignment aids, rain shield. Spectral range 200-4000nm, response time less than 5 sec (95%), Operating temperature -40 to +80°C. Thermopile detector. Sensitivity 7 to 14µV/Wm², (variation < 0.5% from -20 to +50°C). Calibration certificate includes temperature dependency from -20 to +50°C in 8 steps of 10°C. Fitted with both 10K thermistor and PT100 internal temperature sensors. Supplied with waterproof 8-pin plug connector with 10m of pre-wired yellow signal cable.