Atmos 41

The ATMOS 41 All-in-One Weather Station is designed for continuous monitoring of environmental variables, including all standard weather measurements (Section 3). The ATMOS 41 measures the following:
• Solar radiation
• Precipitation
• Air temperature
• Barometric pressure
• Vapor pressure
• Relative humidity
• Wind speed
• Wind direction
• Maximum wind gust
• Lightning strikes
• Lightning distance
• Tilt
All sensors are integrated into a single, small form-factor unit, requiring minimal installation effort. A robust, no moving parts design that prevents errors because of wear or fouling make the weather station ideal for long-term, remote installations. ATMOS 41 can be used for a variety of applications:
• Weather monitoring
• Microenvironment monitoring
• Spatially-distributed environmental monitoring
• Crop weather monitoring
• Fire danger monitoring
• Weather networks
Additional advantages include its low-power design that supports battery-operated data loggers and the SDI-12 three-wire interface. A tilt sensor warns the user of out-of-level condition, and no configurations are necessary.
Prior to use, verify all ATMOS 41 system components are included and appear in good condition.
Technical Specification
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 |
Vapor Pressure
Range | 0–47 kPa |
Resolution | 0.01 kPa |
Accuracy | Varies with temperature and humidity, see specification chart. |

Relative Humidity
Range | 0–100% RH (0.00–1.00) |
Resolution | 0.1% RH |
Accuracy | Varies with temperature and humidity, see specification chart. |

Hysteresis | ±0.80% RH, typical |
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 |
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
Range | 0–65,535 strikes |
Resolution | 1 strike |
Accuracy | Variable with distance, >25% detection at <10 km 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 acquisition systems capable of switched 3.6- to 15.0-VDC excitation and SDI-12 communication
PHYSICAL CHARACTERISTICS
Dimensions
Diameter | 10 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.
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
Cable Diameter
- 0.165 ±0.004 in (4.20 ±0.10 mm), with minimum jacket of 0.030 in (0.76 mm)
ELECTRICAL AND TIMING CHARACTERISTICS
Supply Voltage (VCC to GND)
Minimum | 3.6 VDC continuous |
Typical | NA |
Maximum | 15.0 VDC continuous |
NOTE: ATMOS 41 must be continulously powered to work properly. | |
NOTE: For the ATMOS 41 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 |
Power Line Slew Rate
Minimum | 1.0 V/ms |
Typical | NA |
Maximum | NA |
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)—aRx! Commands
Minimum | NA |
Typical | 10 s |
Maximum | NA |
Power Up Time (SDI ready)—Other Commands
Minimum | NA |
Typical | 800 ms |
Maximum | NA |
Power Up Time (SDI-12, DDI Serial disabled)
Minimum | NA |
Typical | 240 ms |
Maximum | NA |
Measurement Duration
Minimum | NA |
Typical | 110 ms |
Maximum | 3,000 ms |
COMPLIANCE
- Manufactured under ISO 9001:2015
- EM ISO/IEC 17050:2010 (CE Mark)
For inquiries contact us
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