METER Group, Inc. ATMOS 22 User Manual

ATMOS 22

14586-03

8.9.2019

TABLE OF CONTENTS

1. Introduction ..............................................................................................1

2. Operation ...................................................................................................2

2.1 Installation ................................................................................................2

2.2 Connecting .................................................................................................3

2.2.1 Connect to METERDataLogger ........................................................ 4

2.2.2 Connect to Non-METER Logger ........................................................ 4

2.3 Communication .........................................................................................6

3. System .........................................................................................................7

3.1 Specifications ............................................................................................7

3.2 Anemometer ............................................................................................ 10

3.3 Temperature Sensor .................................................................................11

3.4 Tilt Sensor ................................................................................................ 11

3.5 Wind Speed and Direction Theory ............................................................11

3.6 Limitations .............................................................................................. 13

3.6.1 Snow and Ice Accumulation ........................................................... 13

3.6.2 Heavy Rain and Strong Wind ..........................................................13

3.7 Measurements with METER Data Loggers ...............................................14

4. Service ....................................................................................................... 15

4.1 Calibration ............................................................................................... 15

4.2 Cleaning and Maintenance .......................................................................15

4.3 Troubleshooting ....................................................................................... 16

i

4.4 Customer Support....................................................................................17

4.5 Terms and Conditions ..............................................................................17

Reference ....................................................................................................... 18

Index .................................................................................................................19

ii

ATMOS 22

1. INTRODUCTION

Thank you for choosing the ATMOS22 Ultrasonic Anemometer from METER Group.

The ATMOS22 Ultrasonic Anemometer is designed for continuous monitoring of wind speed
and direction (Section3). A robust, no moving parts design that prevents errors because of
wear or fouling make the ATMOS 22 ideal for long-term, remote installations.

Applications of the ATMOS22 are listed below:

• Weather monitoring

• Microenvironment monitoring

• In-canopy wind measurement

• Spatially-distributed environmental monitoring

• Wind profiling

• Crop weather 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 22 system components are included and appear in
goodcondition.

1

OPERATION

2. OPERATION

Please read all instructions before operating the ATMOS22 to ensure it performs to its
full potential.

PRECAUTIONS

METER sensors are built to the highest standards, but misuse, improper protection, or
improper installation may damage the sensor and possibly void the manufacturer’s warranty.
Before integrating ATMOS22, follow the recommended installation instructions and have the
proper protections in place to safeguard sensors from damage.

2.1 INSTALLATION

Follow the steps listed in Table 1 to set up the ATMOS22 and start collecting data.

Table 1 Installation

Wrench 13 mm (1/2 in)

Tools Needed

Preparation

Mounting pole 31.8 to 50.8 mm (0.25 to 2.0 in) diameter

NOTE: Smaller mounts are compatible if washers are added to the V-bolt (not included).
United States standard pipe sizes that are compatible are 1.00-, 1.25-, and 1.50-in. Square
tubing with a width of 1.25 to 2.00 in or T-posts can also work as mounting options.

Consider the Surroundings

Ensure that site selection is far from wind obstruction.

Conduct System Check

Plug the weather station into the logger (Section2.2).

Verify all sensors are functional and read within expected ranges.

Adjust Pole Height

Prepare the mounting pole to the appropriate height. Many installations
require the ATMOS22 to be mounted 2 m above ground, but mounting height
can be adjusted based on the specific application.

Mounting

Install on Mounting Pole

Use the V-bolt to mount the unit at the desired height. The V-bolt is compatible
with most meterological stands, poles, tripods, and other mounts.

Mount Toward True North

Orient the N engraved on the side of the instrument should be oriented to point
true north (not magnetic north). The ATMOS22 must be oriented correctly by
hand for accurate wind direction measurements.

Level the System

Use the bubble level underneath the ATMOS22 or a PROCHECK display to level
the weather station. The angle of the mounting pole may need to be adjusted or
shims added to the ATMOS22–pole interface to achieve level.

2

Mounting

Ground

(continued)

ATMOS 22

Table 1 Installation (continued)

Secure the System

Tighten the V-bolt nuts by hand until hand-tight, and then gently tighten with a
wrench, securing the ATMOS 22 flat and tight against the top of the stand.

CAUTION: Do not overtighten V-bolt.

Secure and Protect Cables

NOTE: Improperly protected cables can lead to severed cables or disconnected sensors.
Cabling issues can be caused by many factors such as rodent damage, driving over sensor
cables, tripping over cables, not leaving enough cable slack during installation, or poor
sensor wiring connections.

Install cables in conduit or plastic cladding when near the ground to avoid
rodent damage.

Gather and secure cables between the ATMOS 22 and the data logger to the
mounting mast in one or more places.

Connect to Data Logger

Plug the sensor into a data logger.

Use the data logger to make sure the sensor is reading properly.

Verify these readings are within expected ranges.

For more instructions on connecting to data loggers, refer to Section2.2.

2.2 CONNECTING

The ATMOS22 works seamlessly with METER data loggers. This system will not work with
some legacy data loggers (Decagon Em5 or Em5B). The ATMOS 22 can also be used with
other data loggers, such as those from Campbell Scientific, Inc. For extensive directions on
how to integrate the sensor into third-party loggers, refer to the ATMOS22 Integrator Guide.

ATMOS22 sensors require excitation voltages in the range of 3.6 to 15.0 VDC and operates
at 2.8- to 5.5-VDC level for data communication. The ATMOS22 can be integrated using
SDI-12 protocol. See the ATMOS22 Integrator Guide for details on interfacing with data
acquisition systems.

ATMOS22 sensors come with a 3.5-mm stereo plug connector (Figure1) to facilitate easy
connection with METER loggers. ATMOS 22 sensors may be ordered with stripped and tinned
wires to facilitate connecting to some third-party loggers (Section2.2.2).

Digital communication
Power

Figure1 3.5-mm stereo plug connector wiring

3

OPERATION

communication (orange)

Power (brown)

The ATMOS41 comes standard with a 5-m cable. It may be purchased with custom cable
lengths for an additional fee (on a per-meter basis). In some instances, the cable can be
extended beyond 75 m by the user, but this is discouraged for a variety of reasons. Please
contact Customer Support for more details before extending or splicing cables.

2.2.1 CONNECT TO METERDATALOGGER

The ATMOS22 works most efficiently with ZENTRA series data loggers. Check the METER

downloads webpage for the most recent data logger firmware. Logger configuration may

be done using either ZENTRA Utility (desktop and mobile application) or ZENTRA Cloud
(web-based application for cell-enabled data loggers).

NOTE: This system will not work with legacy data loggers (Decagon Em5 or Em5B).

1. Plug the stereo plug connector into one of the sensor ports on the logger.

2. Use the appropriate software application to configure the chosen logger port for the
ATMOS 22. METER data loggers will automatically recognize ATMOS 22 sensors.

3. Set the measurement interval.

METER data loggers measure the ATMOS 22 every minute and return the average of the
1-min data across the chosen measurement interval. For example, the interval can be
set to 5 min, 10 min, 15 min. See Table 2 for additional information.

ATMOS 22 data can be downloaded from METER data loggers using either ZENTRA Utility or
ZENTRA Cloud. Refer to the logger user manual for more information about these programs.

2.2.2 CONNECT TO NONMETER LOGGER

The ATMOS22 can be purchased for use with non-METER (third party) data loggers. Refer
to the third-party logger manual for details on logger communications, power supply,
and ground ports. The ATMOS22 Integrator Guide also provides detailed instructions on
connecting sensors to non-METER loggers.

ATMOS 22 sensors can be ordered with stripped and tinned (pigtail) wires for use with screw
terminals. Refer to the third-party logger manual for details on wiring.

Connect the ATMOS 22 wires to the data logger as illustrated in Figure2 and Figure3, with
the power supply wire (brown) connected to the excitation, the digital out wire (orange) to a
digital input, and the bare ground wire to ground.

Ground (bare)

Digital

Figure2 Pigtail wiring

NOTE: Some early ATMOS 22 may have the older Decagon wiring scheme where the power supply is white, the digital
out is red, and the bare wire is ground.

4

ATMOS 22

Digital

Power

(brown)

communication

(orange)

Excitation Digital

Ground

(bare)

Ground

in

Data Logger

Figure3 Wiring diagram

NOTE: The acceptable range of excitation voltages is from 3.6 to 15.0 VDC. To read the ATMOS22 with Campbell
Scientific data loggers, power the sensors off a 12-V port (or any port that continuously powers from 3.6–15.0 VDC).

If the ATMOS22 cable has a standard stereo plug connector and needs to be connected
to a non-METER data logger, use one of the following two options.

Option 1

1. Clip off the stereo plug connector on the sensor cable.

2. Strip and tin the wires.

3. Wire it directly into the data logger.

This option has the advantage of creating a direct connection and minimizes the chance of
the sensor becoming unplugged. However, it then cannot be easily used in the future with a
METER readout unit or data logger.

Option 2

Obtain an adapter cable from METER.

The adapter cable has a connector for the stereo plug connector on one end and three wires
(or pigtail adapter) for connection to a data logger on the other end. The stripped and tinned
adapter cable wires have the same termination as in Figure3: the brown wire is excitation,
the orange is output, and the bare wire is ground.

NOTE: Secure the stereo plug connector to the pigtail adapter connections using adhesive-lined heat shrink to ensure
the sensor does not become disconnected during use.

5

OPERATION

2.3 COMMUNICATION

The ATMOS 22 communicates using SDI-12 communication protocol. To obtain detailed
instructions, refer to the ATMOS 22 Integrator Guide.

The SDI-12 protocol requires that all sensors have a unique address. ATMOS 22 sensor
factory default is an SDI-12 address of 0. To add more than one SDI-12 sensor to a bus, the
sensor address must be changed as described below:

1. Using a PROCHECK connected to the sensor, press the MENU button to bring up the
Configuration tab.

NOTE: If the PROCHECK does not have this option, please upgrade its firmware to the latest version from the
METER Legacy Handheld Devices webpage.

2. Scroll down to SDI-12 Address. Press ENTER.

3. Press the UP or DOWN arrows until the desired address is highlighted.

Address options include 0...9, A…Z, and a…z.

4. Press ENTER.

Detailed information can also be found in the application note Setting SDI-12 addresses on

METER digital sensors using Campbell Scientific data loggers and LoggerNet.

When using the sensor as part of an SDI-12 bus, excite the sensors continuously to avoid
issues with initial sensor startup interfering with the SDI-12 communications.

6

ATMOS 22

3. SYSTEM

This section describes the ATMOS22 Ultrasonic Anemometer.

3.1 SPECIFICATIONS

MEASUREMENT SPECIFICATIONS

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°

MMUNICATION SPECIFICATIONS

CO

Output

SDI-12 communication

Data Logger Compatibility

METER

3.6- to 15.0-VDC excitation and SDI-12 communication

ZL6, Em50, and EM60 data loggers or any data acquisition systems capable of

7

SYSTEM

PHYSICAL CHARACTERISTICS

Dimensions

Diameter 10 cm (3.94 in)

Height 16 cm (6.30 in)

Operating Temperature Range

Minimum –50 °C

Typical NA

Maximum 60 °C

Cable Length

5 m (standard)
75 m (maximum custom cable length)

NOTE: Contact Customer Support if a nonstandard cable length is needed.

Connector Types

3.5-mm stereo plug connector or stripped and tinned wires

ELECTRICAL AND TIMING CHARACTERISTICS

Supply Voltage (VCC to GND)

Minimum 3.6 VDC continuous

Typical NA

Maximum 15.0 VDC continuous

NOTE: The ATMOS 22 must be continulously powered to work properly.

NOTE: For the ATMOS 22 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

8

ATMOS 22

Digital Output Voltage (logic high)

Minimum NA

Typical 3.6 V

Maximum NA

NOTE: For the ATMOS 22 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 NA

Maximum NA

Current Drain (during measurement)

Minimum 0.050 mA

Typical 0.125 mA

Maximum 0.500 mA

Current Drain (while asleep)

Minimum 0.050 mA

Typical 0.125 mA

Maximum 0.150 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

Measurement Duration

Minimum NA

Typical

110 m

s

Maximum 3,000 ms

9

SYSTEM

COMPLIANCE

Manufactured under ISO 9001:2015

EM ISO/IEC 17050:2010 (CE Mark)

3.2 ANEMOMETER

The open space in the center of the anemometer is where the ATMOS22 measures wind
speed. Ultrasonic signals emitted from transducers at right angles to each other bounce off
the porous acoustic plate (Figure4) and back up to the opposite sensor. The speed ofsound
is affected by the wind, and the wind speed is calculated by measuring differences in the
time it takes for sound to travel back and forth between sensors (Section3.5).

When powered on, the ATMOS22 measures the wind speed and direction once every 10 s and
records the instantaneous wind vector components. When queried, the ATMOS22 outputs
the average of the instantaneous measurements since the last query for wind speed and
direction and the maximum instantaneous wind speed value for wind gust.

Splash

guard

Figure4 Anemometer

Acoustic

plate

The ATMOS 22 measures wind speed every 10 s and keeps a running average of the last
10 measurements. If an instantaneous measurement is more than eight times the running
average, the instantaneous measurement is rejected. It is not reported as the maximum gust
or included in the data that are averaged over the output interval.

For normal ATMOS 22 use cases, this is an effective method for eliminating inaccuracy
resulting from spurious spikes in wind speed (e.g., bumblebee checking out the ultrasonic
path). In special use cases where data are output frequently and large step changes in wind
speed are present (e.g., turning on a wind tunnel), this spike rejection algorithm may result in
an error code being output.

10

ATMOS 22

Temperature sensor

3.3 TEMPERATURE SENSOR

The ATMOS22 temperature measurement (Figure5) is made in the small stainless steel
needle containing a tiny temperature sensor (thermistor) that extends from the middle of
the four ultrasonic transducers in the center of the anemometer. The speed of sound is
temperature dependent, so the ATMOS22 temperature measurement is important for the
wind speed and direction calculations. The ATMOS22 temperature measurement should
not be used as an accurate measurement of air temperature. Testing has shown errors of as
much as 2°C between the ATMOS22 temperature sensor and the true air temperature under
sunny conditions.

When powered on, the ATMOS 22 measures the air temperature once every 10 s and
records the instantaneous values. When queried, the ATMOS 22 outputs the average of the
instantaneous measurements since the last query.

NOTE: Temperature data will not be collected by legacy Em50 series data loggers.

Figure5 Temperature sensor

3.4 TILT SENSOR

The ATMOS22 is also equipped with a tilt sensor similar to those found in smartphones.
The primary use of the tilt sensor data is to ensure the ATMOS22 remains level at all times.
Regularly check X and Y tilt data to ensure the ATMOS22 is level; if it has tilted, return to
the site and level again. Although this sensor may also be used to level the instrument
during installation, it is much easier to use the small bubble level on the bottom of the
anemometer plate. For reference, a positive X tilt indicates that the ATMOS22 is leaning
north, and a positive Y tilt indicates that the ATMOS 22 is leaning west.

NOTE: Tilt data will not be collected by legacy Em50 series data loggers.

3.5 WIND SPEED AND DIRECTION THEORY

The theory behind the anemometer comes from Campbell and Unsworth (1979). The speed

c (m/s) of sound in still air depends on air temperature T (K), vapor pressure e (kPa), and

atmospheric pressure,

p (kPa), as shown in Equation 1.

11

SYSTEM

c

vd

c + u

n −Δn−=

vd

c − u

⎛

c = 20.067 T 1+

⎜
⎜
⎜

⎜

⎝

0.32e

p

⎞
⎟

⎟

⎟

⎟

⎠

Equation 1

For a given sound path length, d (m), the number of wavelengths, n, in still air is
determined with Equation 2.

vd

n =

Equation 2

Here v is the frequency of the sound (Hz). When the air is moving, the speed of sound is the
sum of the wind speed and the speed of sound in still air. The anemometer transmits a sound
pulse in a forward direction, then a similar pulse in the reverse direction. The difference in

n

between the two points is computed. If the vector magnitude of the wind in the direction of
the sound is

u (m/s), then

n −Δn+=

Equation 3

Equation 4

for sound traveling with and against the wind. Subtracting the result of Equation 3 from the
result of Equation 4 creates Equation 5.

Equation 5

Even at the maximum wind speeds for the anemometer, u2 is only about 1% of c2, so the
equation can be simplified as shown in Equation 6.

This is the basic equation for the anemometer. Delta (∆) n is proportional to the phase
difference between the forward and reverse sound pulses. The sound comes from a
40 kHz ultrasonic transducer in the head of the anemometer. A sound pulse is transmitted
diagonally across the anemometer, bouncing off an acoustic plate in the center. The sound
pulse is then received by another transducer in the anemometer head that is opposite
the first. Once the sound pulse is received, the receiver becomes the transmitter and the
process is repeated. Two more sensors, mounted at 90 degrees from the first two, give the
other horizontal component of the wind. The sound travels a total distance of about 72 mm
from transmitter to receiver, but

d in the equations is just the horizontal distance, which is

40mm.

If

u is the magnitude of the wind vector in the east-west direction (east +) and v is the magnitude

in the north-south direction (north +), then wind speed is computed with Equation 7.

2

12

S = u2+ v

Equation 6

Equation 7

ATMOS 22

( )

Where the overbar indicates an average of the values sampled every 10 s, wind direction is
computed with Equation 8.

θ = tan−1v u

The wind measurement through more frequent SDI-12 commands requires 42 ms to
complete. An additional 60 ms are required for the computations to determine phase
differences. The anemometer samples every 10 s (or more often if requested through more
frequent SDI-12 commands). The gust speed reported is the highest instantaneous wind
speed measured during the selected averaging interval (must be >20 s or gusts will equal
speed). Wind speeds above 30 m/s are not measured reliably with the phase shift method, so
wind speeds measured above 30 m/s will be reported as 30 m/s.

The ATMOS22 uses a wind speed spike rejection scheme to protect against the inclusion
of spurious wind speed spikes in the averaged wind speed data. The ATMOS22 measures
wind speed every 10 s and keeps a running average of the last 10 measurements. If an
instantaneous measurement is more than eight times the running average, then the
instantaneous measurement is rejected and not reported as the maximum gust or included
in the data that are averaged over the output interval.

For normal ATMOS22 use cases, this is an effective method for eliminating inaccuracy
resulting from spurious spikes in wind speed (e.g., bumblebee investigating the ultrasonic
path). In special use cases where data are output frequently and large step changes in wind
speed are present (e.g., turning on a wind tunnel), this spike rejection algorithm may result in
an error code being output.

NOTE: Cup anemometers average over a much longer interval than 42 ms, so the gusts measured with a sonic
anemometer will have a larger peak-to-mean ratio than a cup anemometer.

Equation 8

3.6 LIMITATIONS

The ATMOS22 is engineered to be a robust device with minimal downtime. However, it does
have limitations that will affect its measurements under some conditions.

3.6.1 SNOW AND ICE ACCUMULATION

Accumulation of snow, ice, or frost can compromise the wind measurements if
accumulation occurs in the anemometer acoustic pathway or on the acoustic plate
(Section4.2).

3.6.2 HEAVY RAIN AND STRONG WIND

During strong storm events, water can splash off of the horizontal bottom plate of the
anemometer envelope and interrupt the signal passing between the sonic transducers. The
spikes on the bottom plate help dissipate the energy of rainwater to minimize splashing and
reduce the likelihood that the wind measurements are interrupted. Additionally, specially
treated hydrophobic porous polyethylene membranes protect the ultrasonic transducers from

13

SYSTEM

direct splashing and the sintered (porous) glass construction draws water from the upper
surface of the acoustic plate to keep a constant sound path length. Despite these features,
heavy rain and strong wind can still cause water to reach the membranes and also cause
temporary water buildup on the acoustic plate. The hydrophobic nature of the transducer
protective membranes and the quick-draining ability of the acoustic plate should limit wind
measurement interruptions to heavy rain events and should bring wind measurement back
online soon after extreme conditions abate.

3.7 MEASUREMENTS WITH METER DATA LOGGERS

METER EM60 series and ZENTRA series data loggers query the ATMOS22 once every
minute and record the appropriate averages and maximums from the ATMOS22 in memory.
When the measurement interval is reached, the 1-min measurements are processed into
the appropriate averages and maximums and output to final storage (see the METER

logger manual for more information). Table 2 describes the quantities output from the

ATMOS22 and how they are processed in the logger for each ATMOS22 measurement.

NOTE: The Em50 series data loggers only record and output wind speed, wind direction, and wind gust. They do not
record or output anemometer temperature or tilt information.

Table 2 ATMOS22 output quantities processed in METER data logger

Data Saved by Logger Each Measure-

Measurement Data Output Every Minute

Wind speed

Wind direction

Wind gust

Anemometer
temperature

Tilt

Average of six 10-s wind speed
measurements in both horizontal
wind vectors

Average of six 10-s wind direction
measurements in both horizontal
wind vectors

Maximum of six 10-s wind speed
measurements

Average of six 10-s anemometer
temperature measurements

Instantaneous measurements of
tilt in X and Y orientation

Wind run is calculated from each
1-min average of both horizontal
wind vectors. METER logger saves
average wind run from
averages.

Weighted direction calculated from
horizontal wind vectors

Maximum wind speed recorded
over measurement interval

Average of
anemometer temperature

Average of
measurements of tilt in X and Y
orientation

ment Interval

m = number of minutes)

(

m 1-min

m 1-min averages of

m instantaneous

14

ATMOS 22

4. SERVICE

This section contains calibration frequencies, cleaning and maintenance, troubleshooting
guidelines, and contact information.

4.1 CALIBRATION

The relationship between wind speed and phase is determined by geometry and the laws of
physics. Since the geometry is tightly controlled in manufacturing, no individual anemometer
calibration is needed. The phase of each ATMOS22 anemometer is initially set to zero in a
zero wind-speed condition. Extensive wind-tunnel and field testing has shown this to result
in accurate wind-speed measurements. A subsample of anemometers is checked monthly
for accuracy as part of routine quality assurance (QA) procedures. Routine recalibration of
the ATMOS22 is not necessary.

4.2 CLEANING AND MAINTENANCE

Below are instructions to clean and maintain the ATMOS22. Cleaning and maintenance
should be performed as needed.

1. Make sure nothing is obscuring the temperature sensor or the sonic transducers shown
in Figure6 (cobwebs, leaves, wasp nests, etc.).

2. Check the following areas to make sure they are clear of miscellaneous environmental,
animal (specifically bird droppings) and insect debris, or spider webs:

a. Anemometer opening

b. Acoustic plate

3. Clean the ATMOS22

a. Scrub with light to medium pressure using a warm, damp cloth.

b. Completely dry the instrument by removing excess water using a dry cloth.

c. Clean around posts and between crevices using a dry brush.

d. Be sure the sensor is level after cleaning.

CAUTIONS

• DO NOT immerse the sensor in water.

• DO NOT touch the temperature sensor needle (Figure6).

CAUTION: The wire leads for the temperature sensor needle are very delicate and can be easily damaged.

• Avoid more than light pressure on the sonic transducers (Figure6).

Do not allow water to enter the sonic transducers (Figure6). Water may corrode the metal parts inside and ruin the
transducers.

15

Temperature sensor

Sonic

transducers

Figure6 Temperature needle and sonic transducers

4.3 TROUBLESHOOTING

Table 3 Troubleshooting the ATMOS 22

Problem Possible Solutions

Check power to the sensor.

Check sensor cable and 3.5-mm plug integrity.

Check data logger wiring to ensure the following connections:

ATMOS 22 not responding

• Brown—3.6 VDC to 15.0 VDC continuous power supply

• Orange—digital data output

• Bare—ground

If sensor does not respond, use the PROCHECK to make sure it is
working satisfactorily.

Check SDI-12 address. It should be zero for METER data loggers.

SERVICE

Sonic
transducers

No wind speed

Check anemometer pathway to make sure there is no debris
blocking the path of the sonic transducer measurement (between
transducers and acoustic plate).

Check the sonic transducers to make sure that there is no water
buildup; if there is moisture, take a dry cloth and dab it away.

Check to see if the acoustic plate (Figure4) is dirty, and clean by
flushing with water and dry with a dry cloth (Section 4.2).

Be sure the ATMOS22 is level.

16

ATMOS 22

4.4 CUSTOMER SUPPORT

NORTH AMERICA

Customer service representatives are available for questions, problems, or feedback Monday
through Friday, 7:00 am to 5:00 pm Pacific time.

Email: [e-mail]

[e-mail]

Phone: [phone]

Fax: [phone]

Website: metergroup.com

EUROPE

Customer service representatives are available for questions, problems, or feedback Monday
through Friday, 8:00 to 17:00 Central European time.

Email: [e-mail]

[e-mail]

Phone: [phone]

Fax: [phone]

Website: metergroup.de

If contacting METER by email, please include the following information:

Name
Address
Phone

NOTE: For products purchased through a distributor, please contact the distributor directly for assistance.

Email address
Instrument serial number
Description of the problem

4.5 TERMS AND CONDITIONS

By using METER instruments and documentation, you agree to abide by the METER Group,
Inc. USA Terms and Conditions. Please refer to metergroup.com/terms-conditions for details.

17

REFERENCE

REFERENCE

Campbell, Gaylon S. and Michael H. Unsworth. 1979. An Inexpensive Sonic Anemometer for

Eddy Correlation. Journal ofApplied Meteorology. 18 (8):1072–1077.

18

INDEX

ATMOS 22

A

anemometer 10
applications 1

C

calibration 15
cleaning 15–16
communication 6, 7
components 12
connecting 3–5
customer support 17

D

data acquisition system 7

See also

E

email address 17

F

fax number 17

I

installation 2–3

L

limitations 13

M

maintenance 15–16
measurements

connecting

air temperature 11
tilt 7, 11
wind direction 7, 10
wind gust 7, 10
wind speed 7, 10

P

phone number 17

S

sensors

anemometer 10
temperature 11
tilt 11

specifications

cable length 8
communication 7
compliance 10
data logger compatibility 7
dimensions 8
electrical 8–9
measurement 7
physical 8

T

temperature sensor 11
terms and conditions 17
theory

air temperature 11–12

wind speed and direction 11–13
tilt sensor 11
troubleshooting 16

Z

ZENTRA

logger 3, 7

ZENTRA Cloud 4

ZENTRA Utility 4

19

14587-03

8.9.2019

2365 NE Hopkins Court Pullman, WA 99163

E: [e-mail] W: metergroup.com

E: [e-mail] W: metergroup.de

METER Group, Inc. USA

T: +1.509.332.2756 F: +1.509.332.5158

METER Group AG

Mettlacher Straße 8, 81379 München

T: [phone] F: [phone]

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