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Related Manuals for METER GROUP ATMOS 14 GEN 2
Summary of Contents for METER GROUP ATMOS 14 GEN 2
- Page 1 ATMOS 14 GEN 2...
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Page 2: Table Of Contents
18412-00 3.19.2021 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 ...................... -
Page 4: Introduction
Gen 1. The two sensor generations can be differentiated by color of the sensor body (Gen 1 is black; Gen 2 is white) and on the heat shrink label on the sensor cable. The ATMOS 14 Gen 2 is a direct drop-in replacement but represents several important improvements over its predecessor, detailed at metergroup.com/atmos14-gen2. -
Page 5: Operation
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. - Page 6 ATMOS 14 GEN 2 Table 1 Installation (continued) 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 mounting pole.
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Page 7: Connecting
OPERATION 2.2 CONNECTING The ATMOS 14 works 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. -
Page 8: Connect To Non-Meter Logger
ATMOS 14 GEN 2 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... -
Page 9: Communication
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. -
Page 10: System
ATMOS 14 GEN 2 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 0.10% RH Accuracy Sensor measurement accuracy is variable across a range of RH. Refer to the chart in Figure 4. - Page 11 SYSTEM Vapor Pressure Range 0–47 kPa Resolution 0.01 kPa Accuracy Sensor measurement accuracy is variable across a range of temperatures and RH. Refer to the chart in Figure 5. Figure 5 Vapor pressure sensor accuracy Barometric Pressure Range 1–120 kPa Resolution 0.01 kPa Accuracy ±0.05 kPa at 25 °C Equilibration...
- Page 12 ATMOS 14 GEN 2 PHYSICAL SPECIFICATIONS Dimensions Diameter 2.0 cm (0.8 in) Height 5.4 cm (2.1 in) Operating Temperature Range Minimum –40 °C Typical Maximum +80 °C NOTE: Sensors may be used at higher temperatures under certain conditions; contact Customer Support for assistance.
- Page 13 SYSTEM Digital Output Voltage (logic high) Minimum Typical 3.6 V Maximum Power Line Slew Rate Minimum 1.0 V/ms Typical Maximum Current Drain (during measurement) Minimum 3.0 mA Typical 3.5 mA Maximum 9.9 mA Current Drain (while asleep) Minimum Typical 0.03 mA Maximum Power Up Time (DDI serial) Minimum...
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Page 14: Components
ATMOS 14 GEN 2 Measurement Duration Minimum Typical 50 ms Maximum COMPLIANCE Manufactured under ISO 9001:2015 2004/108/EC and 2011/65/EU EN61326-1:2013 EN50581:2012 3.2 COMPONENTS The ATMOS 14 sensor consists of electronics potted in marine-grade polyurethane encapsulant (Figure 6). The sensor can then be inserted into a radiation shield (Section 3.2.1). -
Page 15: Radiation Shield
SYSTEM The sensor chips are protected by hydrophobic porous Teflon filters that are water- and dustproof but have extremely high vapor conductance and allow bulk air flow, leading to fast sensor equilibration with the surrounding atmosphere. A cap protects the filters and sensors from impact and abrasion. -
Page 16: Relative Humidity
ATMOS 14 GEN 2 with coefficients defined by Buck (1981): = 0.611 kPa = 17.502, = 240.97 °C, and = temperature in degrees Celsius. Then vapor pressure is calculated as the product of saturation vapor pressure and RH, with RH expressed as a unitless ratio ranging from 0 to 1. -
Page 17: Temperature
SYSTEM Figure 7 RH value corrections 3.3.3 TEMPERATURE The ATMOS 14 has a band gap temperature sensor integrated into the sensor electronics. The temperature sensor accurately measures the sensor temperature. Sensor temperature should remain close to air temperature if the ATMOS 14 radiation shield is adequately shielded and aspirated. -
Page 18: Service
ATMOS 14 GEN 2 4. SERVICE This section describes the calibration and maintenance of ATMOS 14. Troubleshooting solutions and customer service information are also provided. 4.1 CALIBRATION The ATMOS 14 relative humidity/vapor pressure sensors receive a three-point calibration using a METER WP4C chilled-mirror dew point sensor as the calibration standard at 20%, 50%, and 80% RH. -
Page 19: Cleaning And Maintenance
SERVICE 10. Orient the replacement module so that the female 4-pin connector on the sensor body aligns properly with the male connector on the module. The module will sit diagonally across the opening in the sensor body when properly aligned. 11. -
Page 20: Troubleshooting
ATMOS 14 GEN 2 Table 2 Salt solutions Equilibrium RH Molality Salt (% saturation) (mol salt/kg water) LiCl 13.41 LiCl 8.57 NaCl 6.00 If the ATMOS 14 sensor has lost accuracy due to exposure to solvents or other chemicals, the following conditioning procedure may bring the sensor back to the original calibration state: Remove the sensor module from the ATMOS 14 sensor body as described in Section 4.2. -
Page 21: Customer Support
SERVICE Table 3 Troubleshooting the ATMOS 14 (continued) Problem Possible Solutions Check the radiation shield and sensor Teflon filter for contamination or obstructions. Airflow must not be restricted through the filter. Breathe Sensor not reading heavily on sensor and check for a corresponding change in measured RH RH accurately to see if adequate airflow is present. -
Page 22: Terms And Conditions
NOTE: For products purchased through a distributor, please contact the distributor directly for assistance. 4.6 TERMS AND CONDITIONS By using METER instruments and documentation, you agree to abide by the METER Group, Inc. USA Terms and Conditions. Please refer to metergroup.com/terms-conditions... -
Page 23: References
REFERENCES REFERENCES Buck, Arden L. 1981. New Equations for Computing Vapor Pressure and Enhancement Factor. Journal of Applied Meteorology. 20 (12):1527–1432. Murray, F.W. 1967. On the Computation of Saturation Vapor Pressure. Journal of Applied Meteorology. 6:203–204. Robinson, Robert A and Robin H. Stokes. 2002. Electrolyte Solutions: Second Revised Edition. New York: Dover Publications. -
Page 24: Index
INDEX INDEX phone number 18 applications 1 references 20 barometric pressure 8, 12 relative humidity 7, 12, 13 calibration 15 salt solution 16–17 cleaning. See maintenance sensor poisoning 16 compliance 11 specifications components 11–12 communication 8 barometric pressure sensor 12 filter 12 electrical and timing 9–10 measurements 7–8 radiation shield 2, 12, 16... - Page 25 18413-00 7.31.2020 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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