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METER Group, Inc. ATMOS 22 Manual

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ATMOS 22

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Summary of Contents for METER Group, Inc. ATMOS 22

  • Page 1 ATMOS 22...

  • Page 2: Table Of Contents

    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 ......................
  • Page 3 4.4 Customer Support..................17 4.5 Terms and Conditions ................17 Reference ....................... 18 Index ......................... 19...

  • Page 5: Introduction

    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.

  • Page 6: Operation

    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.

  • Page 7: 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...

  • Page 8: Connect To Meter Data Logger

    Power (brown) Ground (bare) Digital communication (orange) 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.
  • Page 9 ATMOS 22 Digital Power communication Ground (brown) (orange) (bare) Excitation Digital Ground 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).

  • Page 10: Communication

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

  • Page 11: System

    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...
  • Page 12 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...
  • Page 13 Digital Output Voltage (logic high) Minimum Typical 3.6 V Maximum 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...

  • Page 14: Anemometer

    Figure 4 Anemometer 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.

  • Page 15: Temperature Sensor

    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.
  • Page 16 SYSTEM ⎛ ⎞ 0.32e ⎟ ⎟ ⎜ ⎜ c = 20.067 T 1+ Equation 1 ⎟ ⎟ ⎜ ⎜ ⎝ ⎠ For a given sound path length, (m), the number of wavelengths, , in still air is determined with Equation Equation 2 Here is the frequency of the sound (Hz).

  • Page 17: Limitations

    ATMOS 22 Where the overbar indicates an average of the values sampled every 10 s, wind direction is computed with Equation θ = tan −1 Equation 8 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.

  • Page 18: Measurements With Meter Data Loggers

    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.

  • Page 19: Service

    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.

  • Page 20: Troubleshooting

    Sonic transducers Temperature sensor 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: •...

  • Page 21: Customer Support

    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: support.environment@metergroup.com sales.environment@metergroup.com phone: +1.509.332.5600 Fax: +1.509.332.5158 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.

  • Page 22: Reference

    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.

  • Page 23: Index

    ATMOS 22 INDEX anemometer 10 phone number 17 applications 1 sensors calibration 15 anemometer 10 cleaning 15–16 temperature 11 communication 6, 7 tilt 11 components 12 specifications connecting 3–5 cable length 8 customer support 17 communication 7 compliance 10 data logger compatibility 7...
  • Page 24 14587-03 8.9.2019 METER Group, Inc. USA 2365 NE Hopkins Court Pullman, WA 99163 T: +1.509.332.2756 F: +1.509.332.5158 E: info@metergroup.com W: metergroup.com METER Group AG Mettlacher Straße 8, 81379 München T: +49 89 1266520 F: +49 89 12665220 E: info.europe@metergroup.com W: metergroup.de ©...

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