Related Manuals for Campbell EE181
Summary of Contents for Campbell EE181
- Page 1 EE181 Temperature and Relative Humidity Probe Revision: 3/17 C o p y r i g h t © 2 0 1 6 - 2 0 1 7 C a m p b e l l S c i e n t i f i c ,...
- Page 3 Limited Warranty “Products manufactured by CSI are warranted by CSI to be free from defects in materials and workmanship under normal use and service for twelve months from the date of shipment unless otherwise specified in the corresponding product manual. (Product manuals are available for review online at www.campbellsci.com.) Products not manufactured by CSI, but that are resold by CSI, are warranted only to the limits extended by the original manufacturer.
- Page 4 (435) 227-9106. Campbell Scientific is unable to process any returns until we receive this form. If the form is not received within three days of product receipt or is incomplete, the product will be returned to the customer at the customer’s expense.
- Page 5 Periodically (at least yearly) check electrical ground connections. • WHILE EVERY ATTEMPT IS MADE TO EMBODY THE HIGHEST DEGREE OF SAFETY IN ALL CAMPBELL SCIENTIFIC PRODUCTS, THE CUSTOMER ASSUMES ALL RISK FROM ANY INJURY RESULTING FROM IMPROPER INSTALLATION, USE, OR MAINTENANCE OF TRIPODS, TOWERS, OR ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS, CROSSARMS, ENCLOSURES, ANTENNAS, ETC.
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Page 7: Table Of Contents
Table of Contents PDF viewers: These page numbers refer to the printed version of this document. Use the PDF reader bookmarks tab for links to specific sections. 1. Introduction ..............1 2. Precautions ..............1 3. Initial Inspection ............1 Ships With .................... - Page 8 Measurement Below 0 °C..............C-3 Figures 7-1. EE181 Sensor Placement in a RAD10E Multi-plate Shield ....9 7-2. EE181 and RAD10E Solar Radiation Shield on a tripod mast ..11 Tables 7-1. Wire Color, Function, and Datalogger Connection for Single-Ended Measurement ............. 7 CRBasic Examples B-1.
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Page 9: Introduction
Model EE181 Temperature and Relative Humidity Probe Introduction The EE181 is a rugged, accurate temperature and relative humidity probe that is ideal for long-term, unattended applications in all climates. The probe uses an E+E Elektronik ® capacitive RH element with a proprietary coating to measure relative humidity and a 1000 Ω... -
Page 10: Ships With
(1) Calibration Card (1) ResourceDVD QuickStart Short Cut is an easy way to program your datalogger to measure the EE181 and assign datalogger wiring terminals. Short Cut is available as a download on www.campbellsci.com and the ResourceDVD. It is included in installations of LoggerNet, PC200W, PC400, or RTDAQ. - Page 11 Click Next. Under the Available Sensors and Devices list, select the Sensors | Meteorological | Relative Humidity & Temperature | EE181 Temperature and Relative Humidity Sensor folder. Choose either constant power or panel switched power (uses less current). Click move the selection to the Selected device window.
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Page 12: Overview
4, check the output of the sensor in the datalogger support software data display to make sure it is making reasonable measurements. Overview The EE181 is a digital probe with linear voltage outputs for temperature and humidity. Its voltage signals are measured with two single-ended inputs on the datalogger. -
Page 13: Specifications
Model EE181 Temperature and Relative Humidity Probe Specifications Features: Well-suited for long-term, unattended applications • Accurate and rugged • Compatible with the following CRBasic dataloggers: CR200(X) • series, CR300 series, CR6 series, CR800 series, CR1000, CR3000, CR5000, CR9000(X) Operating Limits: –40 to 60 °C... -
Page 14: Relative Humidity Measurement
Model EE181 Temperature and Relative Humidity Probe Standard PE Filter: ≤22 s Optional Teflon Filter: ≤30 s Accuracy over Measurement Range: Relative Humidity Measurement Sensor: HC101 Measurement Range: 0 to 100% non-condensing Output Signal Range: 0 to 1.0 Vdc Accuracy*... -
Page 15: Wiring To Datalogger
A complete program example for a select datalogger can be found in Appendix B, Example Programs (p. B-1) 7.2.1 VoltSE() Instruction The VoltSE() measurement instruction is used with CRBasic dataloggers to measure both temperature and relative humidity from the EE181 sensor. The... -
Page 16: Field Installation
(p. 13) discuss temperature and relative humidity sensors. When used in the field, the EE181 must be housed in a radiation shield such as the RAD10E naturally aspirated shields. The white color of these shields reflects solar radiation, and the louvered construction allows air to pass freely through, thereby keeping the probe at or near ambient temperature. -
Page 17: Ee181 Sensor Placement In A Rad10E Multi-Plate Shield
1/3 to 1/2 of the way down from the top shield plate. With a ten- plate shield, the tip of the EE181 should be located around three to four plates down from the top of the shield. See FIGURE 7-1. -
Page 18: Shield Installation
It is recommended to use the EE181 with the MetSpec RAD10E multi-plate radiation shield due to shield performance in bright sunlight and low wind speeds as well as over snow or reflective surfaces. The EE181 will work with the RM Young 10-plate shield but requires a special adapter (pn 28415) to accommodate sensor girth. -
Page 19: Operation
Relative Humidity Probe with the VoltSE() measurement instruction. Low Power Operation The EE181 draws less than 1.2 mA powered from 12 V. The EE181 can be continuously powered from the 12V terminal, or power can be switched with the SW12V terminal to conserve battery life. When power is switched, a two- second warm-up period is required. -
Page 20: Toubleshooting And Maintenance
12 V. There will be a voltage drop along this lead because the wire itself has resistance. The EE181 draws approximately 1.2 mA (worst case) when it is powered. The wire used in the EE181 (pn 9721) has resistance of 25.67 Ω/1000 feet. -
Page 21: Attributions And References
The sensor should be calibrated annually. Please obtain an RMA number before returning the EE181 to Campbell Scientific for calibration. Please refer to the Limited Warranty... - Page 22 Model EE181 Temperature and Relative Humidity Probe Weiss, A., 1977: Algorithms for the calculation of moist air properties on a hand calculator, Amer. Soc. Ag. Eng., 20, 1133-1136. WMO, 2008. Guide to Meteorological Instruments and Methods of Observation. World Meteorological Organization No. 8, 7th edition,...
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Page 23: Importing Short Cut Code Into Crbasic Editor
Appendix A. Importing Short Cut Code Into CRBasic Editor This tutorial shows: How to import a Short Cut program into a program editor for • additional refinement • How to import a wiring diagram from Short Cut into the comments of a custom program Short Cut creates files, which can be imported into CRBasic Editor. -
Page 25: Example Programs
The following example can be used directly with CR800 series, CR1000, CR3000, and CR5000 dataloggers. CRBasic Example B-1. CR1000 Program Measuring the EE181 'Program measures EE181 with single-ended inputs once every 5 seconds 'and stores the average temperature and a sample of the relative 'humidity every 60 minutes. - Page 26 The following example can be used directly with the CR6 datalogger. CRBasic Example B-2. CR6 Program Measuring the EE181 'Program measures EE181 with single-ended inputs once every 5 seconds 'and stores the average temperature and a sample of the relative 'humidity every 60 minutes.
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Page 27: Absolute Humidity
Appendix C. Absolute Humidity The EE181 measures relative humidity. Relative humidity is defined by the equation below: • (C-1) where RH is relative humidity, e is vapor pressure in kPa , and e is saturation vapor pressure in kPa. Vapor pressure, e, is an absolute measure of the amount of water vapor in the air and is related to the dewpoint temperature. -
Page 28: Cr6 Program That Computes Vapor Pressure And Saturation Vapor Pressure
EndProg CRBasic Example C-2. CR6 Program that Computes Vapor Pressure and Saturation Vapor Pressure 'Program measures EE181 with single-ended inputs once every 5 seconds 'and stores the average temperature and a sample of the relative 'humidity every 60 minutes. 'Wiring Diagram... - Page 29 EndProg C.1 Measurement Below 0 °C The EE181 provides a humidity reading that is referenced to the saturated water vapor pressure above liquid water, even at temperatures below 0 °C, where ice might form. This is the common way to express relative humidity and is as defined by the World Meteorological Organization.
- Page 30 Appendix C. Absolute Humidity...
- Page 32 Santo Domingo, Heredia 40305 SOUTH AFRICA COSTA RICA • cleroux@csafrica.co.za • info@campbellsci.cc www.campbellsci.co.za www.campbellsci.cc Campbell Scientific Southeast Asia Co., Ltd. Campbell Scientific Ltd. 877/22 Nirvana@Work, Rama 9 Road Campbell Park Suan Luang Subdistrict, Suan Luang District 80 Hathern Road Bangkok 10250...
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