METER ATMOS 41 User Manual
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METER ATMOS 41 User Manual

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ATMOS 41
Distributed & Supported By:
Edaphic Scientific Pty Ltd
www.edaphic.com.au
info@edaphic.com.au
Ph: 1300 430 928

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Summary of Contents for METER ATMOS 41

  • Page 1 ATMOS 41 Distributed & Supported By: Edaphic Scientific Pty Ltd www.edaphic.com.au info@edaphic.com.au Ph: 1300 430 928...

  • Page 2: Table Of Contents

    2.2.1 Safety Precautions ................5 2.2.2 Cable Problems ................5 2.3 Connecting to a ZENTRA or EM60 Family Data Logger ....... 6 2.4 Connecting to a Non-METER Logger ............6 2.5 Pigtail End Wiring..................6 2.6 Communication ..................7 3. System ......................
  • Page 3 3.12 Theory ....................19 3.12.1 Wind Speed and Direction ............19 3.12.2 Temperature Sensor ..............21 3.13 Limitations..................... 23 3.13.1 Snow and Ice Accumulation ............23 3.13.2 Heavy Rain and Strong Wind ............23 4. Service ....................... 25 4.1 Calibration ....................25 4.2 Cleaning and Maintenance ...............

  • Page 5: Introduction

    1. INTRODUCTION Thank you for choosing the ATMOS 41 Compact Weather Station from METER Group, Inc. The ATMOS 41 Compact Weather Station is designed for continuous monitoring of environmental variables, including all standard weather measurements (see Measurement Specifications on page 9). The ATMOS 41 measures the following: •...

  • Page 6: Operation

    2. OPERATION Please read all instructions before operating the ATMOS 41 to ensure it performs to its full potential. 2.1 INSTALLATION Follow the steps listed in Table 1 to set up the ATMOS 41 and start collecting data. Table 1 Installation Wrench 13 mm (1/2 inch) Secure mounting location Mount (if using ATMOS 41 compass-corrected wind direction, mount on nonferrous pipe)
  • Page 7 • Use the SCAN function in the software to show a list of ATMOS 41 readings. • Verify that these readings are within expected ranges. Third Party Data Loggers To connect to a non-METER data logger, see the ATMOS 41 Integrator’s Guide.

  • Page 8: Connecting The Atmos 41

    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 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 (a possible failure point).

  • Page 9: Connecting To A Zentra Or Em60 Family Data Logger

    To download ATMOS 41 data from a ZENTRA or EM60 logger, use ZENTRA Utility or ZENTRA Cloud. NOTE: The ATMOS 41 draws more current than most other METER sensors because it makes frequent measurements of wind speed and precipitation. As a result, plugging multiple ATMOS 41 stations into a single ZENTRA or EM60 data loggers may have significant impact on battery life.

  • Page 10: Communication

    Scientific data loggers, power the sensors off a 12 V port or switched 12 V port. If the ATMOS 41 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.

  • Page 11: System

    3. SYSTEM This section describes the compact weather station system. 3.1 SPECIFICATIONS MEASUREMENT SPECIFICATIONS Solar Radiation Range: 0 to 1750 W/m Resolution: 1 W/m Accuracy: ±5% of measurement typical Precipitation Range: 0 to 125 mm/h Resolution: 0.017 mm Accuracy: ±5% of measurement from 0 to 50 mm/h Vapor Pressure Range: 0 to 47 kPa...
  • Page 12 SYSTEM Barometric Pressure Range: 50 to 110 kPa Resolution: 0.01 kPa Accuracy: ±0.1 kPa Horizontal Wind Speed Range: 0 to 40 m/s Resolution: 0.01 m/s Accuracy: The greater of 0.3 m/s or 3% of measurement Wind Gust Range: 0 to 40 m/s Resolution: 0.01 m/s Accuracy:...
  • Page 13 ATMOS 41 Lightning Average Distance Range: 0 to 40 km Resolution: 3 km Accuracy: Variable Dimensions 10 cm diameter x 34 cm height (includes rain guage filter) Cable Length 5 m (custom cable lengths are available for an additional cost)

  • Page 14: Pyranometer

    Solar radiation is measured by a pyranometer that is integrated into the lip of the rain gauge funnel at the top of the ATMOS 41. Designed, manufactured, and calibrated by experts at Apogee Instruments, the miniature pyranometer uses a silicon-cell sensor to measure the total incoming (direct and diffuse) solar radiation.

  • Page 15: Anemometer

    The pyranometer is factory calibrated and the sensor-specific calibration value can be found on the interior of the rain funnel. This factor has already been added into the ATMOS 41 so there is no need to do anything with it. But, in the event that this value is needed, it can be found by taking the funnel off the base and checking underneath.

  • Page 16: Vapor Pressure Sensor

    SYSTEM 3.4 VAPOR PRESSURE SENSOR The vapor pressure sensor (Figure 5) on the ATMOS 41 is located behind the circular Teflon ™ membrane in the same housing as the sonic transducers. The Teflon protects the sensor from liquid water and dust while allowing water vapor to freely pass to the sensor and equilibrate with air vapor pressure.

  • Page 17: Rain Gauge

    ATMOS 41 Unlike relative humidity, vapor pressure does not depend on temperature, and is generally conservative over time and space. The vapor pressure of the atmosphere near the relative humidity sensor is the same as the vapor pressure at the relative humidity sensor, even if the relative humidity sensor is not at the same temperature as the atmosphere.

  • Page 18: Temperature Sensor

    SYSTEM The rain gauge locks in place using two pegs on the side of the rain gauge funnel. Follow the steps below to get inside the rain gauge. 1. Press down against the spring and turn counter clockwise slightly. Look for the graphic on the side of the rain gauge. ATTENTION: BE CAREFUL TO UNPLUG THE PYRANOMETER CONNECTOR INSIDE THE FUNNEL BEFORE FULLY REMOVING THE FUNNEL.

  • Page 19: Lightning Sensor

    3.7 LIGHTNING SENSOR The lightning sensor acts much like an AM radio. During a thunderstorm, the crack of the lightning disrupts the AM signal. The integrated circuit inside the sensor listens for this crackle, and when the sensor detects a disturbance, it registers the time of and distance (intensity of signal) to the strike.

  • Page 20: Configuring The Compass And Lightning Sensor Using Procheck

    SYSTEM 3.9 CONFIGURING THE COMPASS AND LIGHTNING SENSOR USING PROCHECK A ProCheck can be used to configure the ATMOS 41 compass and lightning sensor for optimal performance. To make these modifications, the weather station must be plugged into the ProCheck via the stereo port. Figure 8 ATMOS 41 configuration screen 3.9.1 COMPASS CONFIGURATION When the compass is set to ON, the onboard compass automatically corrects wind direction.

  • Page 21: Barometric Sensor

    To set the Strike Reject Lvl follow the steps below: 1. Press Enter to begin changing the Strike Reject Lvl. 2. Press the UP and DOWN arrows to select the new level. 3. Press Enter or SAVE to save the new Strike Reject Lvl to the sensor. 4.
  • Page 22 SYSTEM For a given sound path length, d (m), the number of wavelengths, n, in still air is determined with Equation Equation 4 Here v is the frequency of the sound (Hz). When the air is moving, the sound speed is the sum of the wind speed and the speed of sound in still air.

  • Page 23: Temperature Sensor

    The wind measurement 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). 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).
  • Page 24 SYSTEM Figure 9 Corrected air temperature comparison with the aspirated radiation shield using 1-minute measurement intervals Figure 9 shows the results from the temperature correction compared to the aspirated temperature, which shows data sampled at 1 min and not averaged over time. The estimated accuracy of the air temperature measurement, based on two standard deviations (95% confidence interval), is 0.42 °C.

  • Page 25: Limitations

    3.13 LIMITATIONS The ATMOS 41 is engineered to be a robust device with minimal downtime. However, it does have limitations that will affect its measurements under some conditions. 3.13.1 SNOW AND ICE ACCUMULATION The ATMOS 41 is not heated, so it will not measure frozen precipitation until snow and ice that have accumulated in the funnel melt.

  • Page 26: Service

    Not Needed Contact Apogee Instruments for details on sending the pyranometer in for calibration: techsupport@apogeeinstruments.com +1.877.727.6433. METER offers a service to calibrate barometric pressure and RH sensors (contact METER Support at support.environment@metergroup.com for more information). 4.2 CLEANING AND MAINTENANCE 1. Check the following areas to make sure they are clear of miscellaneous environmental, animal (specifically bird droppings), or insect debris: a.
  • Page 27 Do not touch the temperature sensor when cleaning because it is very delicate and can be damaged if pushed into the ATMOS 41 body. 3. Make sure nothing is obscuring the temperature sensor or the sonic transducers shown in Figure 10...

  • Page 28: Troubleshooting

    Teflon screen Figure 11 Down spout Figure 12 Teflon screen Figure 13 Rain funnel 4.3 TROUBLESHOOTING Table 4 Troubleshooting the ATMOS 41 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 29 SERVICE Table 4 Troubleshooting the ATMOS 41 ( continued Problem Possible Solutions Check and remove any debris from rain gauge funnel. The ATMOS 41 must be within approximately ±2 degrees of dead level in both the X and Y directions to accurately measure rainfall. If not within this range, drops from the flared hole can miss the gold electrodes entirely.

  • Page 30: Customer Support

    Phone: +1.509.332.5600 Fax: +1.509.332.5158 Website: www.metergroup.com If contacting METER by email or fax, please include the following information: Name Fax number Address Instrument serial number Phone Description of the problem NOTE: For ATMOS 41 weather stations purchased through a distributor, please contact the distributor directly...

  • Page 31: Terms And Conditions

    PRICES AND PAYMENT. Invoice prices will be based upon METER prices as quoted or at METER list price in effect at the time an order is received by the Seller. Prices do not include any state or federal taxes, duties, fees, or charges now or hereafter enacted applicable to the goods or to this transaction, all of which are the responsibility of the Buyer.
  • Page 32 WARRANTIES. The Seller warrants all equipment manufactured by it to be free from defects in parts and labor for a period of one year from the date of shipment from factory. The liability of the Seller applies solely to repairing, replacing, or issuing credit (at the Seller’s sole discretion) for any equipment manufactured by the Seller and returned by the Buyer during the warranty period.

  • Page 33: References

    REFERENCES Campbell, G.S. and M.H. Unsworth (1979) An inexpensive sonic anemometer for eddy correlation. J. Appl. Meteor. 18:1072–1077. Buck, A.L. (1981) New equations for computing vapor pressure and enhancement factor. J. Appl. Meteor. 20:1527–1432.

  • Page 34: Index

    Wind speed 1, 10, 13 Lightning strike reject level configuration 18 Sensor calibration scheduler 25 Cleaning 25 References 31 Components 20 Connecting the ATMOS 41 5 Connecting to non-METER logger 6 Sensors Connections 5 Anemometer 13 Customer support 29 Barometric pressure 19...
  • Page 35 INDEX Wind direction 13, 19–21 Wind gust 13 Wind speed 13, 19–21 Troubleshooting ATMOS 41 not responding 27 No pyranometer reading 29 No temperature reading 28 Not reading any rain 28 No wind speed 28 Precipitation measurements in frozen conditions 23...
  • Page 36 18169-00 7/18/2017 METER Group 2365 NE Hopkins Court Pullman, WA 99163 T: +1.509-332-5601 F: +1.509.332.5158 E: support@metergroup.com W: www.metergroup.com © 2017 All Rights Reserved.

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