Surface Temperature: Everest Characteristics Infrared Temperature Sensor Accuracy of ±0.5ºC or ±0.5ºF Resolution of 0.1ºC or 0.1ºF Temperature Range of -40ºC to 100ºC Rugged Stainless Steel Case and Cable Power requirements: 5V to 26V DC (Current Draw: 10 mA + Current Signal)

Surface Temperature: IRTS The IRTS-P is a precision, infra-red thermocouple sensor manufactured by Apogee Instruments to make continuous measurements in field conditions. It is a unique, self powered sensor that measures emitted radiation and outputs the surface temperatures as a type-K thermocouple signal.

Surface Temperature: IRTS Accuracy: ±0.2°C from 15° to 35°C and ±0.1°C when sensor body and target are at the same temperature Wavelength Range: 6 to 14 µm Field of View: 3:1 (At 3 m from sensor, the FOV is a 1 m diameter circle, as calculated from the geometry of the sensor and lens

Surface Temperature: Dodgy Calculation Corrected target temperature is equal to: CTT = ATT - SEC where ATT = Apparent target temperature and sensor error correction (SEC) is the following: SEC = (0.25/Psb)*(ATT-Hsb)^2-Ksb) According to CSI the coefficients suitable to calculate Psb and Ksb are those from Bugbee et al. (1996) but this correction does not work over snow – or frozen surfaces

Petermann Measurements: (3) Surface Temperature A comparison between the IRTS-P and Everest IR thermometer on the Petermann Gletscher 2003 The algorithm for the IRTS-P as defined by CSI is not applicable for temperatures below 0 °C