Campbell EE181 Product Manual
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Campbell EE181 Product Manual

Temperature and relative humidity probe
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Revision: 10/2021
Copyright © 2016 – 2021
Campbell Scientific, Inc.

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Summary of Contents for Campbell EE181

  • Page 1 Revision: 10/2021 Copyright © 2016 – 2021 Campbell Scientific, Inc.

  • Page 2: Table Of Contents

    Table of contents 1. Introduction 2. Precautions 3. Initial inspection 4. QuickStart 5. Overview 6. Specifications 6.1 Temperature measurement 6.2 Relative humidity measurement 7. Installation 7.1 Wiring to data logger 7.2 Data logger programming 7.2.1 VoltSE() instruction 7.3 Mounting 7.3.1 Shield installation 7.3.1.1 Installation in a RAD10E 10-plate shield 7.3.1.2 Installation in a 41003-5 10-plate shield 7.3.2 Mount the shield...
  • Page 3 10. Attributions and References Appendix A. Importing Short Cut code into CRBasic Editor Appendix B. Example programs Table of contents - ii...

  • Page 4: Introduction

    1. 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 PRT to measure temperature.

  • Page 5: Quickstart

    1. Open Short Cut and click Create New Program. 2. Double-click the data logger model. 3. In the Available Sensors and Devices box, type EE181 or locate the sensor in the Sensors > Meteorological > Relative Humidity & Temperature > EE181 Temperature and Relative Humidity Sensor folder.
  • Page 6 6. In Output Setup, type the scan rate, meaningful table names, and Data Output Storage Interval. NOTE: The EE181 has a two second settling time after power up; therefore, the scan rate must be greater than two seconds when using the panel switched power option. EE181 Temperature and Relative Humidity Probe...

  • Page 7: Overview

    5. 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 data logger. Campbell Scientific recommends 12 V power when used with our data loggers. When minimizing power use is important, power can be switched on and off for the measurement, provided there is a two-second warm-up delay.

  • Page 8: Specifications

    View the EU Declaration of Conformity at www.campbellsci.com/ee181-l 6.1 Temperature measurement Sensor: Pt1000 Class A Measurement range: –40 to 60 °C Output signal range: 0 to 1.0 V Accuracy at 23 °C: ±0.2 °C Long term stability: <0.1 °C/year EE181 Temperature and Relative Humidity Probe...

  • Page 9: Relative Humidity Measurement

    Typical long-term stability: <1% RH per year Sensor time constant [63% of a 35 to 80% RH step change (1 m/s air flow at sensor)] Standard PE filter: ≤22 s Optional Teflon filter: ≤30 s EE181 Temperature and Relative Humidity Probe...

  • Page 10: Installation

    U terminals are automatically configured by the measurement instruction. 7.2 Data logger programming Short Cut is the best source for up-to-date programming code for Campbell Scientific data loggers. If your data acquisition requirements are simple, you can probably create and maintain a data logger program exclusively with Short Cut.

  • Page 11: Voltse() Instruction

    When cable lengths are shorter than 6.1 meters or when power is switched, use the measurement instruction to measure the temperature and relative humidity. The EE181 output scale is 0 to 1000 millivolts for the temperature range of –40 to 60 °C and for the relative humidity range of 0 to 100%.
  • Page 12 The optimal location for the EE181 sensor tip inside a multi-plate shield is approximately 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 (p.

  • Page 13: Shield Installation

    Campbell Scientific recommends 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 an adapter to accommodate sensor girth.

  • Page 14: Installation In A Rad10E 10-Plate Shield

    NOTE: Do not mount the shield or route the sensor cable into the enclosure until after the EE181 is installed inside the shield. 7.3.1.1 Installation in a RAD10E 10-plate shield 1. Loosen the nut on the entry gland at the bottom of the shield.

  • Page 15: Operation

    8.2 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. This is programmed with the Delay() instruction, using 0 for the delay option.

  • Page 16: Absolute Humidity

    12 V. There will be a voltage drop along this wire because the wire has resistance. The EE181 draws approximately 1.2 mA (worst case) when it is powered. The wire used in the EE181 has resistance of 25.67 Ω/1000 feet. Using Ohm’s law, the voltage drop (V ), along the signal reference/power ground wire, is given by Eq.

  • Page 17: Measurement Below 0 °C

    World Meteorological Organization. If an RH value is required referenced to ice, the EE181 readings will need to be corrected. One consequence of using water as the reference is that the maximum humidity that will normally be output by the sensor for temperatures below freezing is as follows: 100% RH at 0 °C...

  • Page 18: Troubleshooting

    (p. 8)). 9.2 Maintenance The EE181 probe requires minimal maintenance, but dust, debris, and salts on the filter cap will degrade sensor performance. Check the metal mesh filter on the end of the sensor for debris. If dirt or salt is engrained into the filter, it should be cleaned with distilled water or replaced. For particularly stubborn contamination, swish the entire probe tip in isopropyl alcohol (rubbing alcohol) and rinse off with distilled water.
  • Page 19 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, Geneva, Switzerland. EE181 Temperature and Relative Humidity Probe...
  • Page 20 Block. This adds an apostrophe (') to the beginning of each of the highlighted lines, which instructs the data logger compiler to ignore those lines when compiling. The Comment Block feature is demonstrated at about 5:10 in the CRBasic | Features video EE181 Temperature and Relative Humidity Probe...
  • Page 21 The following examples are for the CR6 data logger. Other data loggers are programmed similarly. CRBasic Example 1: 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.
  • Page 22 CRBasic Example 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 23 See Product Details on the Ordering Information pages at www.campbellsci.com . Other manufacturer's products, that are resold by Campbell Scientific, are warranted only to the limits extended by the original manufacturer. Refer to www.campbellsci.com/terms#warranty for more information.
  • Page 24 To obtain a Returned Materials Authorization or Repair Reference number, contact your CAMPBELL SCIENTIFIC regional office. Please write the issued number clearly on the outside of the shipping container and ship as directed. For all returns, the customer must provide a “Statement of Product Cleanliness and Decontamination”...
  • Page 25 Do not recharge, disassemble, heat above 100 °C (212 °F), solder directly to the cell, incinerate, or expose contents to water. Dispose of spent batteries properly. 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...
  • Page 26 Campbell Scientific Regional Offices Australia France Thailand Location: Garbutt, QLD Australia Location: Vincennes, France Location: Bangkok, Thailand Phone: 61.7.4401.7700 Phone: 0033.0.1.56.45.15.20 Phone: 66.2.719.3399 Email: info@campbellsci.com.au Email: info@campbellsci.fr Email: info@campbellsci.asia Website: www.campbellsci.com.au Website: www.campbellsci.fr Website: www.campbellsci.asia Brazil Germany Location: São Paulo, SP Brazil...

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