ATMOS 41 Gen 2 All-In-One Weather Station

More measurements. Lower cost.
The ATMOS 41 Gen 2 weather station is one of the first affordable, research-grade all-in-one weather station that fulfills all your weather monitoring needs but doesn’t restrain you when you want to make other measurements. All weather data (e.g., humidity, temperature, or atmospheric pressure) are transmitted over a single wire. That means you don’t have to use all of the ports on your data logger just for weather measurements. And, if you are using the ATMOS 41 weather station with our ZL6 data loggers, you have the flexibility to add any of our other sensors, like soil moisture.
12 weather sensors

Simple, compact, and connected
The ATMOS 41 weather station works seamlessly with the ZL6 for simple, plug-and-play atmospheric data logging and cloud-based data storage and management. You can set up an entire weather monitoring system without any complex wiring or programming. The ATMOS 41 weather station is a simple, compact, connected device with the flexibility to do more than weather measurements.

Second generation innovations
METER’s in-house research and development team have been working hard to make the ATMOS 41 Gen 2 more accurate, durable, and reliable than ever before. Wind speed can now be measured up to 60 m/s, meeting the requirements of even more industry standards, such as the IEC61724-1, making it ideal for applications such as utility-scale photovoltaic (PV) systems, and closer than ever to WMO guidelines.

The Gen 2 also provides a precipitation electrical conductivity (EC) measurement, more accurate precipitation measurements thanks to dual rain gauges, easier installation with built-in leveling bracket, and the option of MODBUS communication. Add in improved durability with more UV-resistant components, easier maintenance and serviceability, and a faster WMO-compliant sensor scan rate, and you’ve got the next generation in research-grade all-in-one weather stations.

Feature Summary

• Research weather station measures 12 meteorological variables including: air temperature, relative humidity, vapor pressure, barometric pressure, wind speed, gusts and direction, solar radiation, dual precipitation, precipitation EC, lightning counter and distance
• Wind speed measurements up to 60 m/s
• Easy installation with built-in leveling stand
• Easy maintenance and serviceability with new side panel for access to internal components
• Only one moving part
• All weather station data transmitted over a single cable
• Choose between SDI-12 digital communication or combined MODBUS and SDI-12 digital communication
• WMO-compliant sensor scanning frequency
• Connect to ZL6 for data capture and management
• Designed for continuous deployment in harsh climates
• No louvred radiation shield to attract insects
• Accurate at low wind speeds because limited moving parts will cause friction or fail
• Detects fine-scale wind speed variations with a resolution of 0.01 m/s
• The weather station's built-in accelerometer detects if the sensor is out of level
• The built-in spring acts as a rain gauge filter to keep out large particles but still allow sufficient water flow
• The optional bird deterrent fits perfectly into the weather station's funnel

TECHNICAL SPECIFICATIONS

Measurement Specifications:Solar Radiation
Range: 0 – 1750 W/m2
Resolution: 1 W/m2
Accuracy: ± 5% of measurement typical

Precipitation:
Range: 0 – 1,500 mm/h
Resolution: 0.017 mm
Accuracy: ± 5% of measurement from 0 to 1000 mm/h

Relative Humidity (RH):
Range: 0 – 100 % RH (0.00 – 1.00)
Resolution: 0.1% RH
Accuracy: Varies with temperature and humidity, See specification chart on page 13.
Hysteresis: ±0.80% RH, typical RH
Long-term Drift: ±0.25% RH/year, typical

Air Temperature:
Range: –50 to 60 °C
Resolution: 0.10 °C
Sensor Accuracy: ±0.2 °C
Measurement Uncertainty: ±0.6 °C from -20 to 50 °C for more information see section 3.6.1 of the manual.

Humidity Sensor Temperature:
Range: –40 to 50 °C
Resolution: 0.10 °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 on page 12.

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, typ

Horizontal Wind Speed:
Range: 0–60 m/s
Resolution: 0.01 m/s
Accuracy: The greater of 0.3 m/s or 6% of measurement

Wind Gust:
Range: 0–60 m/s
Resolution: 0.01 m/s
Accuracy: The greater of 0.3 m/s or 6% of measurement

Wind Direction:
Range: 0 – 359 °
Resolution: 1 °
Accuracy: ±5 °

Tilt:
Range: 0° to 180°
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

Lightning Average Distance:
Range: 0 – 40 km
Resolution: 3 km
Accuracy: Variable

Communication Specifications:
Output:
SDI-12 communication
Modbus RS-485

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
Modbus RS-485 enabled ATMOS 41 Gen 2s are capable of SDI-12 communication and Modbus RS-485 with excitation 4 to 24 VDC

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)
1.5 m (5-pin and 8-pin M12)
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 3 stripped and tinned wires
5-pin M12 connector or 5 stripped and tinned wires
8-pin M12 connector or 5 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 Gen 2 weather station must be continuously powered in order to work properly
NOTE: For the ATMOS 41 Gen 2 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
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
Typical: N/A
Maximum: N/A

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: 3 s
Maximum: NA

Measurement Duration
Minimum: NA
Typical: 240 ms
Maximum: 3000 ms