Atmos 41

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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:

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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.

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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

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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)

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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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