All-In-One Weather Station

ATMOS 41 Gen 2
All-In-One Weather Station

The world’s best research-grade all-in-one weather station for atmospheric measurements that is both affordable and dependable.

Measures 12 weather variables
Designed for continuous deployment in harsh climates
Connect to ZL6 for data capture and management

The weather station problem

Most research-grade weather stations are cluttered, complicated, and frustrating to install and maintain. Wiring and programming can be a nightmare, and finding room to mount everything is a challenge. All-in-one weather stations solve these problems, but the tradeoff is flexibility. Adding just one more sensor often requires an extra logger, making the system more complicated and more expensive. 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.

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.

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.

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.

The weather station, reimagined

The ATMOS 41 weather station packages 12 weather sensors into a single, compact device for monitoring atmospheric conditions. It was designed for continuous deployment in harsh climates, such as sub-Saharan Africa and the extreme conditions around photovoltaic (PV) systems. There is only one moving part, eliminating virtually all failure points. No oiling or replacing bearings. Just reliability you can continue to count on.

Only one moving part

The one moving part on the Gen 2 is the tipping cup to provide better resolution at both high and low precipitation thresholds. Gold-plated pins measure each drop of rain using electric conductivity, ensuring a consistent 0.017 mm resolution for dew, rain, and heavy precipitation events. A sonic anemometer and internal accelerometer both ensure consistent, precise measurements without constant maintenance by insuring the stays level and motionless. Limiting the number of moving parts means the ATMOS 41 Gen 2 anemometer is also accurate at low wind speeds. It even has an accelerometer, so you’ll always know the sensor is level and you’re getting accurate data. And leveling the weather station is easier than ever with the new built-in leveling bracket.

Feature summary

Research weather station measures 12 weather variables including: air temperature, relative humidity, vapor pressure, barometric pressure, wind speed, gust and direction, solar radiation, dual precipitation, precipitation EC, lightning strike counter and distance
Wind speed measurements up to 60 m/s
Easy installation with built-in leveling bracket
Easy maintenance and serviceability with new side panel for accessing internal components
Only one moving part
All weather station data transmitted over a single wire
Choose either Digital SDI-12 communication or combined MODBUS and Digital SDI-12 communication
WMO-compliant sensor scan rate
Connect to ZL6 for data capture and management
Designed for continuous deployment in harsh climates
No louvered radiation shield to attract bugs
Accurate at low wind speeds because of limited moving parts will cause friction or fail
Detects fine-scale wind speed variations with 0.01 m/s resolution
Integrated weather station accelerometer detects if sensor is off-level
Integrated spring acts as a rain gauge filter to keep out large particles but still allow enough water flow
Optional bird deterrent fits perfectly on the weather station funnel

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

Electrical Conductivity

Range: 0–3 mS/cm

Resolution: 0.001 mS/cm

Accuracy: The greater of 0.005 mS/cm or 15% of measurement

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: 0.1 °C

Accuracy: ±0.2 °C

Measurement Uncertainty: ±0.6 °C from –20 to 50 °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 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, typical

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

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

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

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

Other

Pyranometer Spectral Response

See graph in specification chart

Compliance

EM ISO/IEC 17050:2010 (CE Mark)

Prop 65 warning

GSA

View GSA details

Bird Spike Installation

ATMOS 41 Gen2 Integrator Guide

ATMOS_Wind-speed-collar_IS_Print

ATMOS41_Funnel_PYR_Replacement

ATMOS41_Gen2_Manual

ATMOS-41-how-to-check-the-drip-counter-calibration

ATMOSGEN2

ATMOS41-particulate-screen

ZL6 DATA LOGGER

ATMOS 41W
Wireless All-In-One Weather Station

At METER, we think getting your data shouldn’t be complicated or costly. And we think wireless should actually be wireless. That’s why we made the ATMOS 41W weather monitoring station.

A true wireless weather station ideal for long-term, remote installations
Incredible 10-minute installation time
Completely solar powered

The truth about wireless

Most all-in-one remote weather stations claim to be wireless but actually include a wire that connects to telemetry in a bulky enclosure. Add to that a big solar panel and a giant battery, and things start to get costly. We think getting your data shouldn’t be complicated—or costly. And we think wireless should actually be wireless. That’s why we created the ATMOS 41W.

Meet the world’s simplest wireless weather station

The ATMOS 41W all-in-one remote weather station is one of the world’s few truly wireless weather stations, and it’s the most affordable research-grade station in its class. It’s robust, reliable, and simple to use. All of the telemetry is enclosed with an integrated cell or Wi-Fi module. But that’s not even the best part. There is nothing on the market that is easier to install. Put it in a backpack, take it to your site, secure it to a post pointing North, and walk away. It’s that easy to start broadcasting real-time data directly to the cloud.

Data are transferred to the Cloud in two different ways, depending on your chosen configuration. Choose between hardware that allows upload via cell service or via Wi-Fi. Whether your site is within reach of cell service or relies on a local internet connection, ATMOS 41W operates where you work, sending data effortlessly directly to ZENTRA Cloud for easy access and analysis.

More accurate than ever

The ATMOS 41W remote weather station measures 10 environmental variables, including solar radiation, precipitation, air temperature (min, max, average), barometric pressure, vapor pressure, relative humidity, wind speed, wind direction, maximum wind gust, and tilt. It takes our ultra-reliable ATMOS technology to the next level with a dual rain measurement for higher accuracy and extended range, making it one of the most robust rain gauges on the market. It combines a drop counter and a tipping spoon to ensure accurate measurements, and it’s the only rain gauge available that can measure electrical conductivity. Now you can tell if you’re measuring rainwater, irrigation water, or if the funnel is plugged with bird droppings. Not only that, we’ve improved the solar radiation, water vapor, air temperature, and wind measurement capabilities to be more compliant with various meteorological organization observation standards.

Not plug and play. Just play.

Forget complicated and costly. If you need a truly wireless, all-in-one, remote weather station that is incredibly simple to install, low maintenance, and can withstand harsh weather conditions, we’ve got you covered. ATMOS 41W makes scientific-grade accuracy easy and affordable, so you can discover more—and work less.

Ditch the setup

We engineered the ATMOS 41W to work right out of the box without having to worry about managing a cell provider or connection, and there’s no programming involved. If using Wi-Fi hardware, simply use the ZENTRA Utility Mobile App to connect to your Wi-Fi network. It’s a true wireless IoT instrument. Put it on a mount, and it’s literally sending data to the cloud. What if there’s a data transmission interruption? No problem. It has an integrated logger that stores your data, so you’ve got backup. Get continuous, 15-minute transmission of high-quality measurements in near-real time. Use ZENTRA Cloud to see, share, and manage your data from anywhere in the world, on any device.

Low power, low cost, low maintenance

The ATMOS 41W remote weather station was specifically designed for remote areas with harsh weather conditions, so it’s tough, durable, requires very little maintenance, and is completely solar powered, saving you countless trips to your site. An innovative tilt sensor signals out-of-level condition, and no configurations are necessary. It’s perfect for microenvironment monitoring, spatially-distributed environmental measurements, crop weather monitoring, fire danger applications, weather networks, and more.

Features

A true wireless weather station ideal for long-term, remote installations
Incredible 10-minute installation
All sensors and cellular or Wi-Fi communications integrated into a single, small form factor
See, share, and manage data remotely with ZENTRA Cloud
Robust design that prevents errors because of wear or fouling
Integrated sensor leveling mechanism
Improved wind speed accuracy
Improved rain funnel filter reduces clogging
Increased resolution of solar radiation measurement to 0.1 W/m2 for standards compliance
Decreased sampling interval of solar radiation, water vapor, air temperature, and wind measurements to 3 s for standards compliance
Output highest and lowest instantaneous temperature measurement for each measurement interval (Tmax, Tmin) for standards compliance
Extended air temperature range (-63 to +60 ºC) for standards compliance
Calibrated thermistor to reliably achieve ± 0.2 ºC @ 25 ºC for temperature sensor accuracy
Tipping spoon added for dual rainfall measurement
Addition of electrical conductivity measurement for rainfall

Measurement Specifications

Upload Frequency

Hourly upload (default)
Contact Customer Support for more frequent reporting options. Additional charges may apply.

Measurement Interval

5 min to 12 h (average or accumulation of more frequent sensor readings) (Section 2.2.7 of ATMOS 41W User Manual).

Time Keeping

Synchronize automatically and on-demand; GPS, cellular, or ZENTRA Utility software.

Solar Radiation

Range: 0–1,750 W/m²

Resolution: 1 W/m²

Accuracy: ±5% of measurement typical

Relative Humidity (RH)

Range: 0–100% RH (0.00–1.00)

Resolution: 0.1% RH

Accuracy: Sensor measurement accuracy is variable across a range of RH. See chart.

Air Temperature

Range: –63 to 60 °C

Resolution: 0.1 °C

Sensor Accuracy: ±0.2 °C at 25 °C

Measurement Accuracy: ±0.6 °C from –20 to 50 °C

For more information see Section 3.2.6 of the ATMOS 41W User Manual

Humidity Sensor Temperature

Range: –63 to 80 °C

Resolution: 0.1 °C

Accuracy: ±0.2 °C

Vapor Pressure

Range: 0–47 kPa

Resolution: 0.01 kPa

Accuracy: Sensor measurement accuracy is variable across a range of temperature and RH. See chart.

Barometric Pressure

Range: 1–120 kPa

Resolution: 0.01 kPa

Accuracy: ±0.05 kPa at 25 °C
±0.1 kPa from –10 to 50 °C
±0.5 kPa below -10 °C and above 60 °C

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°–359.9°

Resolution: 0.1°

Accuracy: ±5°

Tilt

Range: 0° to 180°

Resolution: 0.1°

Accuracy: ±1°

Precipitation

Range: 0–1,500 mm/h

Resolution: 0.017 mm

Accuracy: ±5% of measurement from 0 to 1,000 mm/h

Electrical Conductivity

Range: 0–3 mS/cm

Resolution: 0.001 mS/cm

Accuracy: The greater of 0.005 mS/cm or 15% of measurement

Communication Specifications

Cellular Communication

3G Specifications: UMTS 3G 5-band cellular module with 2G fallback

3G Coverage: 550+ global partner carriers
Cellular and data hosting service provided by METER

4G Specifications: 4G LTE-M and NB-IoT cellular

4G Coverage: VERIZON, AT&T^®, and T-Mobile in the USA.
Select global partner carriers
Cellular and data hosting service provided by METER

NOTE: 4G is available in USA, Canada, and select other countries (Contact Customer Support or a METER sales partner for more information).

Mobile Communication

Bluetooth 5.2—supporting Bluetooth Low-Energy protocol.

GPS Communication

Type: Integrated 56-channel GPS/QZSS receiver

Update: Daily (automatic) and on-demand (manual)

Accuracy: ±4 m, with good sky view

Physical Specifications

Dimensions

Width: 16.5 cm (6.5 in)

Height: 31.8 cm (12.5 in)

Memory Type

Nonvolatile flash, full data retention with loss of power

Data Storage

8 MB (more than 100,000 records)

Battery Capacity

6 AA NiMH or alkaline batteries

Battery Life

Alkaline: 7 months typical for hourly uploads or 4 months with 15-min data upgrade.

NiMH: 3+ years with an unobstructed view of the sun.
Charging through solar energy harvesting.

Operating Temperature Range

Minimum: –40 °C

Typical: NA

Maximum: 60 °C

NOTE:Barometric pressure and relative humidity sensors operate accurately at a minimum of –40 °C. Alkaline batteries should be used if temperatures below -40 °C are expected.