Campbell EE181 Manual de usuario

Revision: 10/2021

Campbell Scientific, Inc.

Table of contents

1. Introduction 1

2. Precautions 1

3. Initial inspection 1

4. QuickStart 2

5. Overview 4

6. Specifications 5

6.1 Temperature measurement 5

6.2 Relative humidity measurement 6

7. Installation 7

7.1 Wiring to data logger 7

7.2 Data logger programming 7

7.2.1 VoltSE() instruction 8

7.3 Mounting 8

7.3.1 Shield installation 10

7.3.1.1 Installation in a RAD10E 10-plate shield 11

7.3.1.2 Installation in a 41003-5 10-plate shield 11

7.3.2 Mount the shield 11

8. Operation 12

8.1 Measurement 12

8.2 Low power operation 12

8.3 Long cable lengths 12

8.4 Absolute humidity 13

8.4.1 Measurement below 0 °C 14

9. Troubleshooting and maintenance 14

9.1 Troubleshooting 15

9.2 Maintenance 15

Table of contents - i

10. Attributions and References 16

Appendix A. Importing Short Cut code into CRBasic Editor 17

Appendix B. Example programs 18

Table of contents - ii

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. For optimum results, the EE181 should be recalibrated annually.

For Edlog data logger support, contact Campbell Scientific.

2. Precautions

lREAD AND UNDERSTAND the Safety section at the back of this manual.

lCare should be taken when opening the shipping package to not damage or cut the cable

jacket. If damage to the cable is suspected, contact Campbell Scientific.

lAlthough the EE181 is rugged, it should be handled as a precision scientific instrument.

lDo not touch the sensor element.

lSantoprene® rubber, which composes the black outer jacket of the cable, will support

combustion in air. It is used because of its resistance to temperature extremes, moisture,

and UV degradation. It is rated as slow burning when tested according to U.L. 94 H.B. and

passes FMVSS302. However, local fire codes may preclude its use inside buildings.

3. Initial inspection

lUpon receipt of the EE181, inspect the packaging and contents for damage. File damage

claims with the shipping company.

lThe model number and cable length are printed on a label at the connection end of the

cable. Check this information against the shipping documents to ensure the expected

product and cable length were received.

EE181 Temperature and Relative Humidity Probe 1

4. QuickStart

A video that describes data logger programming using Short Cut is available at:

www.campbellsci.com/videos/cr1000x-data logger-getting-started-program-part-3 .Short

Cut is an easy way to program your data logger to measure the sensor and assign data logger

wiring terminals. Short Cut is available as a download on www.campbellsci.com . It is included

in installations of LoggerNet,RTDAQ, and PC400.

Use the following procedure to get started.

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. Double-click either EE181 (constant power) or EE181 (panel

switched power); the panel switched power option uses less current but requires a scan

rate that is greater than 5 seconds. Data defaults to degree Celsius. This can be changed by

clicking the Deg C box and selecting Deg F, for degrees Fahrenheit, or Kfor Kelvin.

EE181 Temperature and Relative Humidity Probe 2

4. Click the Wiring tab to see how the sensor is to be wired to the data logger. Click OK after

wiring the sensor.

5. Repeat steps three and four for other sensors.

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 3

7. Select the measurement and its associated output option.

8. Click Finish and save the program. Send the program to the data logger if the data logger

is connected to the computer.

9. If the sensor is connected to the data logger, check the output of the sensor in the data

display in LoggerNet,RTDAQ, or PC400 to make sure it is making reasonable

measurements.

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. Switching power avoids constant current flow through data

logger ground, which can affect the accuracy of low-level single-ended voltage measurements.

The EE181 uses a metal mesh filter with excellent response, protection against dust, and no water

absorption.

Features:

lWell-suited for long-term, unattended applications

lAccurate and rugged

lCompatible with the following CRBasic data loggers: CR6, CR1000X, CR800series,

CR300series, CR3000, CR1000

EE181 Temperature and Relative Humidity Probe 4

6. Specifications

Operating temperature: –40 to 60 °C

Storage temperature: –40 to 80 °C

Probe length: 160 mm (6.3 in), 172 mm (6.77 in) including connector

Probe diameter: 21 mm (0.83 in)

Weight with 5 m cable: 290 g (10.2 oz)

Housing: Plastic material / IP65

Filter: 30 µm pore size, stainless steel mesh

Power consumption: <1.2 mA at 12 V

Supply voltage (using Campbell

Scientific cable): 7 to 30 VDC (12 VDC recommended)

Start-up time: 2 s typical

Maximum cable length: 300 m (1000 ft) with 12 V power

Analog outputs

Offset at 0 V: ±3 mV (maximum)

Deviation from digital signal: < ±1 mV (0.1 °C, 0.1% RH)

Compliance: 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 5

Sensor time constant [63% step

change (1 m/s air flow at sensor)]

Standard PE filter: ≤22 s

Optional Teflon filter: ≤30 s

Accuracy over measurement range:

6.2 Relative humidity measurement

Sensor: HC101

Measurement range: 0 to 100% non-condensing

Output signal range: 0 to 1.0 VDC

Accuracy*

(including hysteresis, non-linearity

and repeatability, traceable to

international standards,

administrated by NIST, PTB, BEV)

–15 to 40 °C: ≤90% RH ± (1.3 + 0.003 • RH reading) % RH

–15 to 40 °C: >90% RH ± 2.3% RH

–25 to 60 °C: ± (1.4 + 0.01 • RH reading) % RH

–40 to 60 °C: ± (1.5 + 0.015 • RH reading) % RH

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 6

* The accuracy statement includes the uncertainty of the factory calibration with an enhancement factor k=2 (2-

times standard deviation).

The accuracy was calculated in accordance with EA-4/02 and with regard to GUM (Guide to the Expression of

Uncertainty in Measurement).

7. Installation

If you are programming your data logger with Short Cut, skip Wiring to data logger (p. 7) and

Data logger programming (p. 7). Short Cut does this work for you. See QuickStart (p. 2) for a

Short Cut tutorial.

7.1 Wiring to data logger

Connections to Campbell Scientific data loggers for measuring humidity and temperature using

two single-ended analog inputs are given in Table 7-1 (p. 7). See Long cable lengths (p. 12) for a

discussion on errors caused by long cable lengths.

Table 7-1: Wire color, function, and data logger connection for single-ended measurement

Wire color Wire function Data logger connection terminal

Yellow Temperature signal Uconfigured for single-ended analog input1,

SE (single-ended, analog-voltage input)

Blue Relative humidity signal Uconfigured for single-ended analog input,

Black Signal reference ⏚(analog ground)

Clear Shield ⏚

Red Power 12V or SW12V

1Uterminals 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. If your data acquisition needs are more complex,

the files that Short Cut creates are a great source for programming code to start a new program

or add to an existing custom program.

EE181 Temperature and Relative Humidity Probe 7

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