At the AWS Urdukas station the CX115P Lsi-Lastem barometer is connected with measurement system (recorder, data logger) that accepts analog signals. The barometer functions according to the piezometric principle: a resistive film is deposited on a slice of silica with a bridge form; as the pressure changes, the slice will deform and consequently changes the system's resistance. The CX115P model mounts a special thermal compensation system that significantly reduces drift. Specific characteristic: Range: 800 ž 1100 hPa (1 hPa=1 mBar) Sea level correction range: -300...+2000 mt. Thermal drift: 0,01 hPa/°C (-10..+60°C) Linearity&Hysteresis: < 0,3% of the range Overload: max. 2 Pa Load resi stance: Current output types: <500W. Power consumption: 3 W Response time (T90): 1 ms Environmental limits: -25 .. +60°C Output connections: terminals Weight: 650 gr. Housing case material: Plastic Protection: IP40 Downward cable outlet

In Lukla the CX115P Lsi-Lastem barometer is connected with a measurement system (recorder, data logger) that accepts analog signals. The barometer works according to the piezometric principle: a resistive film is deposited on a slice of silica with a bridge form; as the pressure changes, the slice will deform and consequently changes the system's resistance. The CX115P model mounts a special thermal compensation system that significantly reduces drift. General characteristics: Range: 800 ž 1100 hPa (1 hPa=1 mBar) Sea level correction range: -300...+2000 mt. Thermal drift: 0,01 hPa/°C (-10..+60°C) Linearity&Hysteresis: < 0,3% of the range Overload: max. 2 Pa Load resi stance: Current output types: <500W. Power consumption: 3 W Response time (T90): 1 ms Environmental limits: -25 .. +60°C Output connections: terminals Weight: 650 gr. Housing case material: Plastic Protection: IP40 Downward cable outlet

At the AWS Askole station the CX115P Lsi-Lastem barometer is connected with measurement system (recorder, data logger) that accepts analog signals. The barometer functions according to the piezometric principle: a resistive film is deposited on a slice of silica with a bridge form; as the pressure changes, the slice will deform and consequently changes the system's resistance. The CX115P model mounts a special thermal compensation system that significantly reduces drift. Specific characteristic: Range: 800 ž 1100 hPa (1 hPa=1 mBar) Sea level correction range: -300...+2000 mt. Thermal drift: 0,01 hPa/°C (-10..+60°C) Linearity&Hysteresis: < 0,3% of the range Overload: max. 2 Pa Load resi stance: Current output types: <500W. Power consumption: 3 W Response time (T90): 1 ms Environmental limits: -25 .. +60°C Output connections: terminals Weight: 650 gr. Housing case material: Plastic Protection: IP40 Downward cable outlet

Vaisala BAROCAP® Digital Barometer PTB330 is a new generation barometer, designed for a wide range of high-end atmospheric pressure measurement. • Vaisala BAROCAP® sensor • Accurate measurement • Excellent long-term stability • Added reliability through redundancy • Graphical trend display with 1-year history data • Altitude corrected pressure (QFE, QNH) • For professional use in meteorology, aviation, laboratories, and demanding industrial applications Technical Characteristics: Barometric pressure range 500 ... 1100 hPa Class A Class B Linearity* ±0.05 hPa ±0.10 hPa Hysteresis* ±0.03 hPa ±0.03 hPa Repeatability* ±0.03 hPa ±0.03 hPa Calibration uncertainty** ±0.07 hPa ±0.15 hPa Accuracy at +20 °C (+68 °F) *** ±0.10 hPa ±0.20 hPa Barometric pressure range 50 ... 1100 hPa Class B Linearity* ±0.20 hPa Hysteresis* ±0.08 hPa Repeatability* ±0.08 hPa Calibration uncertainty** ±0.15 hPa Accuracy at +20 °C *** ±0.20 hPa Temperature dependence**** 500 ... 1100 hPa ±0.1 hPa 50 ... 1100 hPa ±0.3 hPa Total accuracy -40 ... +60 °C (-40 ... +140 °F) Class A Class B 500 ... 1100 hPa ±0.15 hPa ±0.25 hPa 50 ... 1100 hPa ±0.45 hPa Long-term stability 500 ... 1100 hPa ±0.1 hPa/year 50 ... 1100 hPa ±0.1 hPa/year * Defined as ±2 standard deviation limits of endpoint non-linearity, hysteresis or repeatability error. ** Defined as ±2 standard deviation limits of inaccuracy of the working standard including traceability to NIST. *** Defined as the root sum of the squares (RSS) of endpoint non-linearity, hysteresis error, repeatability error and calibration uncertainty at room temperature. **** Defined as ±2 standard deviation limits of temperature dependence over the operating temperature range.

At the AWS Pyramid Laboratory Observatory station the CX115P Lsi-Lastem barometer is connected with measurement system (recorder, data logger) that accepts analog signals. The barometer functions according to the piezometric principle: a resistive film is deposited on a slice of silica with a bridge form; as the pressure changes, the slice will deform and consequently changes the system's resistance. The CX115P model mounts a special thermal compensation system that significantly reduces drift. Technical characteristic: Range: 800 ž 1100 hPa (1 hPa=1 mBar) Sea level correction range: -300...+2000 mt. Thermal drift: 0,01 hPa/°C (-10..+60°C) Linearity&Hysteresis: < 0,3% of the range Overload: max. 2 Pa Load resi stance: Current output types: <500W. Power consumption: 3 W Response time (T90): 1 ms Environmental limits: -25 .. +60°C Output connections: terminals Weight: 650 gr. Housing case material: Plastic Protection: IP40 Downward cable outlet

At Lukla station a DMA 570 thermohygrometer was installed in 2010. Temperature sensitive element is a thermoresistance Pt100 type while the humidity sensitive element is a capacitive plate. The sensitive elements are protected from incident solar radiation by a double radiation shield. Sensors for temperature and relative humidity measurements with radiation shield for meteorological uses. Sensors are equipped with a microprocessor.