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ATMOS 41 Tech Specs
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Technical Specifications

Measurement Specifications
Solar Radiation
Range: 0 – 1750 W/m2
Resolution: 1 W/m2
Accuracy: ± 5% of measurement typical
Precipitation
Range: 0 – 400 mm/h
Resolution: 0.017 mm
Accuracy: ± 5% of measurement from 0 to 50 mm/h
Relative Humidity (RH)
Range: 0 – 100 % RH (0.00 - 1.00)
Resolution: 0.1% RH
Accuracy: Varies with temperature and humidity, ±1.5% RH typical. See specification chart.
Hysteresis: ±0.80% RH, typical RH
Long-term Drift: ±0.25% RH/year, typical
Air Temperature
Range: –50 to 60 °C
Resolution: 0.1 °C
Accuracy: ±0.6 °C
Humidity Sensor Temperature
Range: –40 to 50 °C
Resolution: 0.1 °C
Accuracy: ± 1.0 °C
Vapor Pressure
Range: 0 – 47 kPa
Resolution: 0.01 kPa
Accuracy: Varies with temperature and humidity, ±0.2 kPa typical below 40 °C. See specification chart.
Barometric Pressure
Range: 1 – 120 kPa
Resolution: 0.01 kPa
Accuracy: ±0.05 kPa at 25 °C
Equilibration: <10 ms
Long-term Drift: < 0.1 kPa/year, typical
Horizontal Wind Speed
Range: 0–30 m/s
Resolution: 0.01 m/s
Accuracy: The greater of 0.3 m/s or 3% of measurement
Wind Gust
Range: 0–30 m/s
Resolution: 0.01 m/s
Accuracy: The greater of 0.3 m/s or 3% of measurement
Wind Direction
Range: 0 – 359 °
Resolution: 1 °
Accuracy: ±5 °
Tilt
Range: –90° to 90°
Resolution: 0.1°
Accuracy: ±1 °
Lightning Strike Count
Range: 0 - 65,535 strikes
Resolution: 1 strike
Accuracy: Variable with distance, >25% detection at <10km typical
Lightning Average Distance
Range: 0 – 40 km
Resolution: 3 km
Accuracy: Variable
Communication Specifications
Output
SDI-12 communication
Data Logger Compatibility
METER ZL6 and EM60 data loggers or any data aquisition systems capable of switched 3.6- to 15.0-VDC excitation and SDI-12 communication
Physical Specifications
Dimensions
Diameter: 10.0 cm (3.9 in)
Height: 28 cm (11.0 in), includes rain gauge filter
Operating Temperature Range
Minimum: –50 °C
Typical: NA
Maximum: 60 °C
NOTE: Barometric pressure and relative humidity sensors operate accurately at a minimum of –40 °C
Cable Length
5 m (standard)
75 m (maximum custom cable length for additional cost)

NOTE: Contact Customer Support if a nonstandard cable length is needed.
Cable Diameter
0.165 ±0.004 in (4.20 ±0.10 mm), with minimum jacket of 0.030 in (0.76 mm)
Connector Types
Stereo plug connector or stripped and tinned wires
Stereo Plug Connector Diameter
3.5-mm
Conductor Gauge
22-AWG / 24-AWG drain wire
Electrical and Timing Characteristics
Supply Voltage (VCC to GND)
Minimum: 3.6 VDC continuous
Typical: NA
Maximum: 15.0 VDC continuous
NOTE: The ATMOS 41 weather station must be continuously powered in order to work properly

NOTE: For the ATMOS 41 weather station to meet digital logic levels specified by SDI-12, it must be excited at 3.9 VDC or greater.
Digital Input Voltage (Logic High)
Minimum: 2.8 V
Typical: 3.0 V
Maximum: 5.5 V
Digital Input Voltage (Logic Low)
Minimum: -0.3 V
Typical: 0.0 V
Maximum: 0.8 V
Digital Output Voltage (Logic High)
Minimum: NA
Typical: 3.6 V
Maximum: NA
NOTE: For the ATMOS 41 weather station to meet digital logic levels specified by SDI-12, it must be excited at 3.9 VDC or greater.
Power Line Slew Rate
Minimum: 1.0 V/ms
Current Drain (During Measurement)
Minimum: 0.2 mA
Typical: 8.0 mA
Maximum: 33.0 mA
Current Drain (While Asleep)
Minimum: 0.2 mA
Typical: 0.3 mA
Maximum: 0.4 mA
Power Up Time (SDI Ready)—other commands
Minimum: NA
Typical: 800 ms
Maximum: NA
Power Up Time (SDI Ready)—aRx! commands
Minimum: NA
Typical: 10 s
Maximum: NA
Measurement Duration
Minimum: NA
Typical: 110 ms
Maximum: 3000 ms
Other
Pyranometer Spectral Response
Compliance
Manufactured under ISO 9001:2015
EM ISO/IEC 17050:2010 (CE Mark)
GSA