METER ATMOS 22 User manual

ATMOS 22

TABLE OF CONTENTS

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

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

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

2.2 Connecting the ATMOS22..........................................................................4

2.2.1 Connecting to a ZENTRA, EM60, or Em50 FamilyDataLogger..........4

2.2.2 Connecting to a Non-METER Logger ................................................ 5

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

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

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

3.2 Anemometer ..............................................................................................9

3.3 Temperature Sensor................................................................................. 10

3.4 Tilt Sensor................................................................................................ 10

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

3.6 Limitations .............................................................................................. 12

3.6.1 Snow and Ice Accumulation........................................................... 12

3.6.2 Heavy Rain and Strong Wind .......................................................... 12

4. Service....................................................................................................... 13

4.1 Calibration ............................................................................................... 13

4.2 Cleaning and Maintenance....................................................................... 13

4.3 Troubleshooting....................................................................................... 14

4.4 Customer Support.................................................................................... 15

4.5 Terms and Conditions .............................................................................. 16

References .................................................................................................... 18

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

14586-01

1.6.2018

INTRODUCTION

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.

ATMOS 22

2. OPERATION

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

full potential.

SAFETY PRECAUTIONS

METER sensors are built to the highest standards. Misuse, improper protection, or improper

installation may damage the sensor and possibly void the manufacturer’s warranty.

Before integrating ATMOS22 or other METER sensors into a system, make sure to 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

Tools Needed

Wrench 13 mm (1/2 inch)

Secure mounting location

Mount

meteorological stand

pole in cement

tripod

Diameter: 31.8–50.8 mm, 1.25–2.00 inch

NOTE: Smaller mounts are compatible if washers are added to the V-bolt (not included).

Standard pipe sizes that are compatible are 1.00-, 1.25-, and 1.50-inch diameter pipes.

Square tubing with a width of 1.25 to 2.00 inches or T-posts can alsowork as mounting

options.

Preparation

Consider the Surroundings

Avoid obstructions.

Ensure that site selection is far from wind obstruction.

Conduct System Check

Verify that the ATMOS 22 reads within expected ranges (Section 3).

Adjust Pole Height

Mounting height can be adjusted based on the speciﬁc application for the

ATMOS22.

OPERATION

Table 1 Installation (continued)

Mounting

Install on Mounting Pole

The ATMOS22 is ﬁtted with a V-bolt, allowing it to be mounted on top of most

posts, poles, tripods, etc.

Mount Toward True North

The ATMOS22 must be oriented correctly for accurate wind direction

measurements. An Nengraved on the side of the instrument should be

oriented to point true north (not magnetic north).

Level the System

Use the bubble level underneath the ATMOS22 or a ProCheck display to level

the anemometer. The angle of the mounting pole may need to be adjusted or

shims added to the ATMOS22 pole interface to achieve level.

Secure the System

Use a wrench to tighten the bolts, securing the ATMOS22 ﬂat and tight against

the top of the stand.

Connecting

Plug Sensor into Data Acquisition System

Connect the 3.5-mm stereo plug connector into a ZENTRA-, EM60-, or Em50-

family of data loggers.

Conﬁgure it to read the ATMOS22 (refer to Section 3).

Verify

Use the SCAN function in the software to show a list of ATMOS22 readings.

Verify that these readings are within expected ranges.

Third Party Data Loggers

To connect to a non-METER data logger, see the ATMOS22 Integrator Guide.

ATMOS 22

Table 1 Installation (continued)

Protecting Cables

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 the cable, not leaving enough cable

slack during installation, poor sensor wiring connections.

Relieve Cable Strain

To relieve strain on the connections and prevent loose cabling from being

inadvertently snagged, gather and secure the cables travelling between the

ATMOS22 and the data acquisition device to the mounting mast in one or

more places.

Prevent Rodent Damage

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

rodent damage.

Secure Excess Cable

Tie excess cable to the data logger mast to ensure cable weight does not cause

sensor to unplug.

2.2 CONNECTING THE ATMOS22

The ATMOS22 Ultrasonic Anemometer works most efficiently with ZENTRA-, EM60-, or

Em50-family data loggers. However, this system will not work with legacy data loggers

(Decagon Em5, Em5B).

2.2.1 CONNECTING TO A ZENTRA, EM60, OR EM50 FAMILYDATALOGGER

The ATMOS22 works seamlessly with ZENTRA, EM60, or Em50 data loggers. Logger

configuration may be done using either ZENTRA Utility (desktop and mobile) or ZENTRA

Cloud (for cell-enabled ZENTRA data loggers).

1. Plug the 3.5-mm stereo plug connector into one of the sensor ports.

2. Once the ATMOS22 has been connected to a ZENTRA, EM60, or Em50 data logger,

conﬁgure the logger port for the ATMOS22.

3. Set the measurement interval.

Download ATMOS22 data from a ZENTRA, EM60, or Em50 logger using either ZENTRA

Utility or ZENTRA Cloud.

The standard station with a 3.5-mm stereo plug connector (Figure1) connects to and is

configured with a ZENTRA, EM60, or Em50 data logger.

OPERATION

Ground

Data

Power

Figure1 3.5-mm stereo plug connector wiring

The ATMOS22 comes standard with a 5-m cable. It may be purchased with custom cable

lengths for an additional fee (on a per-meter fee basis). METER has successfully tested

digital communication on cable lengths up to 1,000 m (3,200 ft). This option eliminates

the need for splicing the cable (which introduces a possible failure point). However, the

maximum recommended length is 75 m.

2.2.2 CONNECTING TO A NONMETER LOGGER

The ATMOS22 ultrasonic anemometer may be purchased for use with non-METER data

loggers. These sensors typically come configured with stripped and tinned (pigtail) lead

wires for use with screw terminals. Refer to the third-party logger manual for details

on wiring. The ATMOS22 Integrator Guide gives detailed instructions on connecting the

anemometer to non-METER loggers.

Connect the ultrasonic anemometer wires to the data logger as illustrated in Figure2, 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)

Data (orange)

Power (brown)

Figure2 Pigtail wiring

ATMOS 22

Switched

3.6–15 VDC

Digital

Data Logger

Data

(orange)

Ground

(bare)

Power

(brown)

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 switched 12 V port.

If the ATMOS22 has a standard 3.5-mm plug and will be connected to a non-METER data

logger, please use one of the following two options when connecting to a non-METER

data logger.

Option 1

1. Clip off the plug 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 with no 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) on the other end for connection to a data logger. Both 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.

2.3 COMMUNICATION

The ATMOS22 communicates using the SDI-12 communication protocol. To obtain detailed

instructions, refer to the ATMOS22 Integrator’s Guide.

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