METER ATMOS 41 User Manual Download Page 1

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ATMOS 41

Distributed & Supported By:

Edaphic Scientific Pty Ltd

www.edaphic.com.au

[email protected]

Ph: 1300 430 928

Summary of Contents for 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: ... 6 2 5 Pigtail End Wiring 6 2 6 Communication 7 3 System 9 3 1 Specifications 9 3 2 Pyranometer 12 3 3 Anemometer 13 3 4 Vapor Pressure Sensor 14 3 5 Rain Gauge 15 3 6 Temperature Sensor 16 3 7 Lightning Sensor 17 3 8 Compass 17 3 9 Configuring the Compass and Lightning Sensor Using ProCheck 18 3 9 1 Compass Configuration 18 3 9 2 Lightning Strike Reject Level Configuration 18 3 10 Barometric Sens...

Page 3: ...ture 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 25 4 3 Troubleshooting 27 4 4 Customer Support 29 4 5 Terms and Conditions 30 References 33 Index 35 ...

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Page 5: ...lt compass orientation WEATHER STATIONS REIMAGINED All sensors are integrated into a single small form factor unit requiring minimal installation effort A robust no moving parts design that prevents errors because of wear or fouling make the weather station ideal for long term remote installations Applications of the ATMOS 41 are listed below weather monitoring microenvironment monitoring spatiall...

Page 6: ...Smaller mounts are compatible if washers are added to the V bolt not included Standard pipe sizes that are compatible are 1 0 1 25 and 1 5 in diameter pipes Square tubing with a width of 1 25 to 2 0 in or T posts can also work as mounting options Preparation Consider the Surroundings Avoid obstructions Ensure that site selection is far from wind obstruction Make sure surrounding objects will not s...

Page 7: ...ble level underneath the ATMOS 41 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 41 pole interface to achieve level The ATMOS 41 must be within approximately 2 degrees of dead level in both the X and Y directions to accurately measure rainfall and solar radiation Secure the System Use a wrench to tighten the bol...

Page 8: ... m 3 200 ft This option eliminates the need for splicing the cable a possible failure point However the maximum recommended length is 75 m 2 2 1 SAFETY 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 41 or other METER sensors into a syste...

Page 9: ...tended heavy clouds the solar panel may not provide enough charging current to keep the system running with multiple ATMOS 41 units METER recommends using only one ATMOS 41 per ZENTRA or EM60 data logger 2 4 CONNECTING TO A NON METER LOGGER The ATMOS 41 weather station may be purchased for use with non METER data loggers These sensors typically come configured with stripped and tinned pigtail lead...

Page 10: ...ctly 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 jack on one end and three wires or pigtail adapter on the other end for connec...

Page 11: ... Resolution 0 017 mm Accuracy 5 of measurement from 0 to 50 mm h Vapor Pressure Range 0 to 47 kPa Resolution 0 01 kPa Accuracy Varies with temperature and humidity 0 2 kPa typical below 40 C Relative Humidity Range 0 to 100 Resolution 0 1 Accuracy Varies with temperature and humidity 3 RH typical Air Temperature Range 40 to 50 C Resolution 0 1 C Accuracy 0 6 C Humidity Sensor Temperature Range 40 ...

Page 12: ...urement Wind Gust Range 0 to 40 m s Resolution 0 01 m s Accuracy The greater of 0 3 m s or 3 of measurement Wind Direction Range 0 to 359 Resolution 1 Accuracy 5 Compass Heading Range 0 to 359 Resolution 1 Accuracy 5 Tilt Range 0 to 180 Resolution 0 1 Accuracy 1 Lightning Strike Count Range 0 to 65 535 strikes Resolution 1 strike Accuracy Variable with distance 25 detection at 10 km typical ...

Page 13: ...le for an additional cost Electrical and Timing Characteristics Supply Voltage VCC to GND Minimum 3 6 V Typical Maximum 15 0 V Digital Input Voltage logic high Minimum 2 8 V Typical 3 0 V Maximum 15 0 V Digital Input Voltage logic low Minimum 0 3 V Typical 0 0 V Maximum 0 8 V Power Line Slew Rate Minimum 1 0 V ms Typical Maximum Current Drain during measurement Minimum 0 2 mA Typical 8 0 mA Maximu...

Page 14: ...5 EM ISO IEC 17050 2010 CE Mark 3 2 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 A carefully developed cosine correc...

Page 15: ...alcohol and a Q tip work well for cleaning the sensor area Do NOT use an abrasive cloth on the sensor surface as it will scratch Microfiber bags work well too 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 ...

Page 16: ...emperature multiplied by the relative humidity Figure 5 Vapor Pressure Sensor If the relative humidity of the air is desired it can be computed using Equation 1 Equation 1 RH e T e r air s air a where ea is the vapor pressure of the air from the ATMOS 41 and es Tair is saturation vapor pressure at the air temperature given by the ATMOS 41 The saturation vapor pressure is calculated using the Magnu...

Page 17: ...ontains a 9 31 cm diameter rain gauge During rain events the flared hole Figure 6 forms the rain into drops that pass by the drip counter The spring Figure 6 acts as a filter to keep out large particles but still allows enough flow so water does not back up Gold pins Figure 6 measure each drop of rain Because the flared hole forms a drop of a known size the ATMOS 41 counts the drops and calculate ...

Page 18: ...emperature measurement Figure 7 is in the center of the anemometer area where a small stainless steel needle containing a tiny temperature sensor thermistor extends from the middle of the four sonic transducers Unlike most air temperature measurements the weather station sensor is not covered with louvered plates to protect from solar heating Instead it sits in open air susceptible to solar heatin...

Page 19: ...rous metal interferes with the digital compass accuracy All ATMOS 41 units are shipped with the compass corrected wind direction turned OFF so the typical installation requires that the N on the side of the weather station be oriented to north true north not magnetic north for accurate wind direction measurements If the ATMOS 41 is mounted on a nonferrous pole the wind direction compass correction...

Page 20: ...lation location and mounting Follow the steps below to turn the compass correction ON or OFF 1 Highlight the compass setting 2 Press Enter to toggle the setting Follow the steps below to perform a compass calibration 1 Turn the compass correction to ON 2 Highlight the compass calibration option 3 Press Enter to begin the calibration 4 Follow the directions on the ProCheck screen 3 9 2 LIGHTNING ST...

Page 21: ...es caused by weather 3 11 TILT SENSOR The ATMOS 41 is also equipped with a tilt sensor similar to those found in smartphones Although this sensor may be used to level the instrument it is much easier to use the small bubble level on the bottom of the anemometer plate The primary use of the tilt sensor data will be to ensure the ATMOS 41 remains level at all times Regularly check x and y tilt data ...

Page 22: ...sic 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 a sintered glass disk in the center The sound pulse is then received by another transducer in the anemometer head that...

Page 23: ...mperature according to Equation 11 Equation 11 T T c k d u S corr uncorr P s t a f p where αs the absorptivity of the surface to solar radiation St the total solar radiation measured cp 29 3 J mol 1 C 1 k is a constant u the wind speed d the characteristic dimension Although these values can be assumed some αs and k were optimized using a Levenberg Marquardt Least Squares analysis Optimal air temp...

Page 24: ...asurement based on two standard deviations 95 confidence interval is 0 42 C To provide an idea of how comparable the data are a concurrently tested temperature sensor in a radiation shield typical measurement approach showed an accuracy of 0 66 C also based on a two standard deviation estimate Thus the temperature correction of the ATMOS 41 appears to give a better estimate of actual air temperatu...

Page 25: ...2 1 on page 5 3 13 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 porous po...

Page 26: ...on techsupport apogeeinstruments com 1 877 727 6433 b 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 Rain funnel b Solar radi...

Page 27: ... inside the sensors and ruin them 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 cobwebs leaves wasp nests etc 4 Check the downspout Figure 11 for debris 5 Observe the Teflon screen Figure 12 to see if it is dirty If ...

Page 28: ...utions ATMOS 41 not responding Check power to the sensor Check sensor cable and 3 5 mm plug integrity Check data logger wiring to ensure the following connections Brown 3 6 V to 15 V power supply Orange digital out Bare ground If sensor does not respond use the ProCheck to make sure it is working satisfactorily Rain funnel Teflon screen Down spout ...

Page 29: ...es are aligned correctly Figure 15 Figure 14 Pyranometer Figure 15 Gold electrodes Water not flowing through rain gauge Check all screens and the outflow to ensure there is no lodged debris No wind speed Check anemometer pathway to make sure there is no debris blocking the path of the sonic transducer measurement between transducers and polished metal on base Check the sonic transducers to make su...

Page 30: ...Customer service representatives are available for questions problems or feedback Monday through Friday 8 am 5 pm Pacific time Email support environment metergroup com sales environment metergroup com 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 Address Phone Fax number Instrument serial number ...

Page 31: ... and reasonable attorney s fees RISK OF LOSS AND DELIVERY TITLE Liability for loss or damage passes to the Buyer when the Seller delivers the goods on the Seller s dock or to the transporting agent whichever occurs first The Seller has the right to deliver the goods in installments Shipping and delivery dates communicated by the Seller to the Buyer are approximate only SHIPMENT In the absence of s...

Page 32: ...e further shipments The Seller s failure to enforce at any time or for any period of time the provisions of this contract will not constitute a waiver of such provisions or the right of the Seller to enforce each and every provision GOVERNING LAW The validity construction and performance of the contract and the transactions to which it relates will be governed by the laws of the United States of A...

Page 33: ...pbell 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: ...ture 9 Lightning distance 1 11 Lightning strikes 1 10 Precipitation 1 9 Precipitation max intensity 1 9 Relative humidity 1 9 Solar radiation 1 9 12 Tilt 1 10 19 Vapor pressure 1 9 14 Wind direction 1 10 13 Wind gust 1 10 13 Wind speed 1 10 13 R References 31 S Sensors Anemometer 13 Barometric pressure 19 Compass 17 Lightning sensor 17 Pyranometer 12 Rain gauge 15 Temperature sensor 16 Tilt 19 Vap...

Page 35: ...nding 27 No pyranometer reading 29 No temperature reading 28 Not reading any rain 28 No wind speed 28 Precipitation measurements in frozen conditions 23 Water not flowing through rain gauge 28 Wind speed and direction errors during heavy rain and strong wind 23 Z ZENTRA ZENTRA Cloud 6 ZENTRA Utility 6 ...

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