METER ATMOS 14 Manual de usuario

ATMOS 14

TABLE OF CONTENTS

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

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

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

2.2 Connecting................................................................................................. 4

2.2.1 Connect to METER Logger................................................................4

2.2.2 Connect to Non-METER Logger........................................................5

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

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

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

3.2 Components ............................................................................................ 12

3.2.1 Radiation Shield ............................................................................ 12

3.2.2 Relative Humidity and Temperature Sensor................................... 12

3.2.3 Barometric Pressure Sensor .......................................................... 13

3.3 Theory...................................................................................................... 13

3.3.1 Vapor Pressure............................................................................... 13

3.3.2 Relative Humidity .......................................................................... 14

3.3.3 Temperature .................................................................................. 14

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

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

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

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

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

4.5 Terms and Conditions .............................................................................. 18

References .................................................................................................... 19

Index ................................................................................................................. 20

18013-04

1.17.2020

ATMOS 14

1. INTRODUCTION

Thank you for choosing the ATMOS 14 temperature and relative humidity (RH) sensor from

METER Group.

The ATMOS 14 is designed to measure the following:

• Air temperature

• RH

• Barometric pressure

• Vapor pressure

A rugged design allows the ATMOS 14 to withstand long-term exposure to hostile conditions,

making it ideal for a wide range of applications including standard meteorological

monitoring, evapotranspiration measurement, greenhouse monitoring and control, concrete

moisture monitoring, and building humidity monitoring for mold prevention and remediation.

Verify that ATMOS 14 and radiation shield (if ordered) appear in good condition.

OPERATION

2. OPERATION

Please read all instructions before operating the ATMOS14 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 14 into a system, follow the recommended installation

instructions and have the proper protections in place to safeguard sensors from damage.

2.1 INSTALLATION

In general, temperature and humidity measurements become more accurate as wind speed

increases. For most outdoor and greenhouse measurement scenarios, the ATMOS 14 must

be housed in a radiation shield with adequate air ﬂow to allow the sensor to come into

equilibrium with air temperature. For nongreenhouse, indoor monitoring applications, a

radiation shield is not critical because the radiation loading is small.

Follow the steps listed in Table 1 to set up the ATMOS14 and start collecting data.

Table 1 Installation

Tools Needed

Wrench

Mounting pole

Preparation

Consider the Surroundings

Ensure that site selection is far from wind obstruction and objects that can

store heat.

Conduct System Check

Plug the sensor into the logger (Section2.2) to make sure the sensor is

functional.

Adjust Pole Height

Check Radiation Shield

Ensure the sensor is securely installed in the radiation shield.

ATMOS 14

Table 1 Installation (continued)

Mounting

Install on Mounting Pole

Use the radiation shield mounting bracket and V-bolt to mount the radiation

shield to the mounting pole at the desired height.

Secure the System

Use a wrench to tighten the bolts, securing the radiation shield to the

mountingpole.

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 14 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.

OPERATION

2.2 CONNECTING

The ATMOS 14 seamlessly with METER data loggers. The sensor 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 14 Integrator Guide.

The ATMOS 14 sensor requires excitation voltages in the range of 3.6 to 15.0 VDC and

operates at a 2.8- to 5.5-VDC level for data communication. The ATMOS 14 can be integrated

using SDI-12 protocol. See the ATMOS 14 Integrator Guide for details on interfacing with data

acquisition systems.

The ATMOS 14 sensors come with a 3.5-mm stereo plug connector (Figure1) to facilitate

easy connection with METER loggers. ATMOS14 sensors may be ordered with stripped and

tinned wires to facilitate connecting to some third-party loggers (Section2.2.2).

Ground

Digital communication

Power

Figure1 Stereo plug connector

The ATMOS 14 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 LOGGER

The ATMOS 14 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).

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 14. METER data loggers will automatically recognize ATMOS 14 sensors.

3. Set the measurement interval.

METER data loggers measure the ATMOS 14 every minute and return the average of the

1-min data across the chosen measurement interval.

ATMOS 14 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.

ATMOS 14

2.2.2 CONNECT TO NONMETER LOGGER

The ATMOS 14 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 14 Integrator Guide also provides detailed instructions on

connecting sensors to non-METER loggers.

ATMOS 14 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 14 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

communication (orange)

Power (brown)

Figure2 Pigtail wiring

NOTE: The VP-4 (predecessor to ATMOS 14) may have the older Decagon wiring scheme where the power supply is

white,the digital out is red, and the bare wire is ground.

Excitation Digital

Data Logger

Ground

Digital

communication

(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 14 with Campbell

Scientific data loggers,power the sensors off a switched 12-V port.

If the ATMOS 14 cable has a standard stereo plug connector and needs to be connected to

a non-METER data logger, use one of the following two option

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.

OPERATION

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.

2.3 COMMUNICATION

The ATMOS 14 communicates using SDI-12 communication protocol. To obtain detailed

instructions, refer to the ATMOS 14 Integrator Guide.

The SDI-12 protocol requires that all sensors have a unique address. ATMOS 14 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.

ATMOS 14

3. SYSTEM

This section describes the ATMOS 14 sensor.

3.1 SPECIFICATIONS

MEASUREMENT SPECIFICATIONS

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.

Refer to the chart in Figure4.

Figure4 RH sensor accuracy

Equilibration

Time (τ, 63%)

<40 s (response time in 1 m/s air stream)

Hysteresis <1% RH, typical

Long-Term Drift <0.5% RH/year, typical

Temperature

Range –40 to 80 °C

Resolution 0.1 °C

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METER TEROS 11 Manual de usuario

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METER TEROS 54 Manual de usuario

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METER PHYTOS 31 Manual de usuario

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