METER GROUP ATMOS 14 GEN 2 Page 23 Manual Download

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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.

World Meteorological Organization (WMO). 2008.

Guide to Meteorological Instruments and

Methods of Observation

. WMO-No. 8. Geneva, Switzerland.

Summary of Contents for ATMOS 14 GEN 2

Page 1: ...ATMOS 14 GEN 2...

Page 2: ...3 2 1 Radiation Shield 12 3 2 2 Relative Humidity and Temperature Sensor 12 3 2 3 Barometric Pressure Sensor 12 3 3 Theory 12 3 3 1 Vapor Pressure 12 3 3 2 Relative Humidity 13 3 3 3 Temperature 14 4...

Page 3: ......

Page 4: ...monitoring and control and building humidity monitoring for mold prevention and remediation Verify that ATMOS 14 and radiation shield if ordered appear in good condition This manual pertains specific...

Page 5: ...For most outdoor and greenhouse measurement scenarios the ATMOS 14 must be housed in a radiation shield with adequate air ow to allow the sensor to come into equilibrium with air temperature For nongr...

Page 6: ...ues 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 cab...

Page 7: ...stom 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 Custom...

Page 8: ...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 Decag...

Page 9: ...rface and the ZENTRA Utility Mobile app as described below NOTE The sensor SDI 12 address must be returned to 0 to work with ZENTRA loggers 1 Using a mobile device open the ZENTRA Utility Mobile app 2...

Page 10: ...measurement accuracy is variable across a range of RH Refer to the chart in Figure 4 Figure 4 RH sensor accuracy Equilibration Time 63 25 s response time in 1 m s air stream Hysteresis 0 80 RH typical...

Page 11: ...igure 5 Vapor pressure sensor accuracy Barometric Pressure Range 1 120 kPa Resolution 0 01 kPa Accuracy 0 05 kPa at 25 C Equilibration Time 63 10 ms Long Term Drift 0 1 kPa year typical COMMUNICATION...

Page 12: ...stance Cable Length 5 m standard 75 m maximum custom cable length NOTE Contact Customer Support if a nonstandard cable length is needed Connector Types 3 5 mm stereo plug connector or stripped and tin...

Page 13: ...rent Drain during measurement Minimum 3 0 mA Typical 3 5 mA Maximum 9 9 mA Current Drain while asleep Minimum NA Typical 0 03 mA Maximum NA Power Up Time DDI serial Minimum NA Typical NA Maximum 110 m...

Page 14: ...be inserted into a radiation shield Section 3 2 1 End cap Cable Sensor body Figure 6 ATMOS 14 components The ATMOS 14 uses a primary sensor chip to measure RH and air temperature Section 3 2 2 and a...

Page 15: ...air ow to allow the sensor to come into equilibrium with air temperature Each sensor chip is veri ed as accurate before prior to shipment However all capacitance RH sensors drift over long periods of...

Page 16: ...water is used to calculate vapor pressure over the full temperature range ATMOS 14 vapor pressure output values are correct over the full temperature range The METER ZENTRA system calculates and outp...

Page 17: ...4 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 i...

Page 18: ...th recently calibrated sensors METER recommends that the sensor modules be replaced every 2 years to ensure best accuracy Please contact Customer Support for new sensor modules The process for swappin...

Page 19: ...he airflow through the radiation shields and may reduce its effectiveness However the polymer RH sensing element in the ATMOS 14 can be poisoned by exposure to volatile organic compounds solvents and...

Page 20: ...ing from communication problems catastrophic sensor failure or highly inaccurate measurements due to sensor poisoning by volatile chemicals If the problem is not listed or these solutions do not solve...

Page 21: ...air temperature Ensure that the ATMOS 14 sensor body is not exposed to high levels of thermal radiation This is could be important in some industrial applications Test to see if the sensor responds to...

Page 22: ...l number Description of the problem NOTE For products purchased through a distributor please contact the distributor directly for assistance 4 6 TERMS AND CONDITIONS By using METER instruments and doc...

Page 23: ...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 Yor...

Page 24: ...M Magnus Tetens equation 12 maintenance 16 17 measurements barometric pressure 8 relative humidity 7 temperature 7 8 vapor pressure 8 P phone number 18 R references 20 relative humidity 7 12 13 S sal...

Page 25: ...ins 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 Stra e 8 81379 M nchen T 49 89 1266520 F 49 89 12665220 E info europe mete...

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