Campbell Scientific 083E User Manual

Model 083E Relative Humidity

and Temperature Sensor

6/12

Copyright © 2012

Campbell Scientific, Inc.

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083E 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. Cautionary Statements................................................1

3. Initial Inspection ..........................................................2

4. Quickstart.....................................................................2

4.1 Quick Installation .....................................................................................2

4.2 Programming with Short Cut....................................................................3

5. Overview.......................................................................6

6. Specifications ..............................................................7

7. Installation....................................................................7

7.1 Siting.........................................................................................................7

7.2 Mounting ..................................................................................................8

7.3 Wiring Instructions...................................................................................9

7.4 Programming............................................................................................9

7.4.1 Programming Example ................................................................... 9

8. Operation.....................................................................10

8.1 Sensor Verification.................................................................................10

8.2 Limitations of RH Measurements at Below Freezing Temperatures......11

8.3 Temperature Table..................................................................................12

9. Maintenance and Troubleshooting ..........................13

9.1 Maintenance Schedule............................................................................13

10. References ...............................................................13

5.1 CRBasic Instructions................................................................................5

Figures

1-1. 083E mounted in a 41003-5 radiation shield...........................................1

4-1. 41003-5 radiation shield mounted on a crossarm....................................2

4-2. 41003-5 radiation shield mounted on a mast...........................................3

7-1. 092 mounted in 41003-5 radiation shield................................................8

i

083E Table of Contents

Table

7-1. 083E Sensor Wiring for Example Program............................................ 9

8-1. Model 083E-1-X Temperature vs. Sensor Resistance.......................... 12

ii

Model 083E Relative Humidity and Temperature Sensor

1. Introduction

The 083E is a microprocessor controlled relative humidity and temperature
sensor. Measurement ranges are 0 to 100% relative humidity and –50°C to
50°C. It is commonly used in association with wind farm power performance
measurements on permanent met towers.

Before using the 083E, please study

• Section 2, Cautionary Statements

• Section 3, Initial Inspection

• Section 4, Quickstart

More details are available in the remaining sections.

FIGURE 1-1. 083E mounted in a 41003-5 radiation shield

2. Cautionary Statements

• The 083E is a sensitive instrument. It is particularly susceptible to damage

and miss-calibration. Repair and re-calibration should only be attempted
by trained repair technicians. If repair or calibration is required, refer to
the customer assistance statement at the head of this manual and contact
Campbell Scientific.

• Do not touch the sensor element.

1

Model 083E Relative Humidity and Temperature Sensor

3. Initial Inspection

• Upon receipt of the 083E, inspect the packaging and contents for damage.

File damage claims with the shipping company.

• The 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 are received.

4. Quickstart

Figure 1-1 shows the 083E installed in a 41003-5 radiation shield. Figures 4-1
and 4-2 show the radiation shield mounted on a crossarm and a mast,
respectively.

4.1 Quick Installation

Review Section 7, Installation for complete instructions. To install the 083E,

you will need:

• 41003-5 Radiation Shield

• 28415 Hex Plug (ships with 083E sensor)

1. Insert the 28415 hex plug that ships with the 083E sensor into the

underside of the 41003-5 base.

2. Attach the radiation shield to the tripod mast, crossarm, or tower leg using

the supplied U-bolt. See Figures 4-1 and 4-2 for examples of shield
mounting.

FIGURE 4-1. 41003-5 radiation shield mounted on a crossarm

2

Model 083E Relative Humidity and Temperature Sensor

FIGURE 4-2. 41003-5 radiation shield mounted on a mast

3. Insert the sensor through the center of the hex plug at the bottom of the

radiation shield.

4. Tighten the hex plug such that it compresses against the body of the 083E

to hold it inside the radiation shield.

5. Attach the sensor cable to the connector on the bottom of the 083E.

6. Secure sensor cable to mast or crossarm with cable ties.

4.2 Programming with Short Cut

Short Cut Program Generator for Windows can be used to program the
CR1000 datalogger to measure the 083E as outlined in the following
procedure. Short Cut can also be used to program other 083E compatible
Campbell Scientific dataloggers.

1. Open Short Cut and click on New Program.

3

Model 083E Relative Humidity and Temperature Sensor

2. Select a scan interval.

3. Select 083E Temperature and Relative Humidity Sensor and click the

right arrow to add it to the list of sensors to be measured.

4

Model 083E Relative Humidity and Temperature Sensor

4. Define the name of the public variables. Variables default to AirTC and

RH that hold the air temperature and relative humidity measurements.

Select the desired units of measure. Units default to Deg C.

5. Sensor connections to the CR1000 datalogger are shown in the Wiring

tab.

5

Model 083E Relative Humidity and Temperature Sensor

6. Select the desired output data for final storage and click Finish.

5. Overview

7. A full description of sensor wiring can be found by selecting Wiring

Diagram at the left of the Short Cut window. Send the program from the

PC to the CR1000 datalogger if telecommunications link is active.

6

The 083E is a microprocessor-controlled relative humidity and temperature
sensor. Relative humidity response is linear with negligible hysteresis or
temperature dependence. The temperature sensor is a three-element composite
thermistor type with linear response over the range of –50°C to 50°C. The
sensor is designed to be mounted in a radiation shield when used outdoors.

6. Specifications

Features:

Compatibility
Dataloggers: CR800 series

CR1000
CR3000

Measurement

Ranges
RH: 0 to 100% relative humidity
Temperature: -50° to 50°C (-58° to 122°F)
Accuracies
RH: ±2.0% from 0 to 100% RH
Temperature: ±0.10° C (0.18° F)
Response
RH: 10 s with 2 m/s wind aspiration

Temperature

Operating: -50° to 50°C (-58° to 122°F)

See Section 8.2, Limitations of RH Measurement at

Compensation: RH is temperature compensated internally

Model 083E Relative Humidity and Temperature Sensor

• Relative humidity sensing element: thin film polymer capacitor

• Temperature sensing element: thermistor

Below Freezing Temperatures.

7. Installation

7.1 Siting

Power requirement
Source: 10 to 18 Vdc
Load: < 5 mA

Outputs
RH: 0 to 1 Vdc
Temperature: Resistive bridge

Dimensions
Length: 216 mm (8.5 in)
Diameter: 19 mm (0.75 in)

If the sensor is to be mounted in a radiation shield, refer to the radiation shield
manual section for mounting details. A typical installation is illustrated in the

Section 7.2, Mounting.

Sensors not installed in a radiation shield should be mounted in a representative
location having good airflow and shaded from sunlight or other radiant heat
source.

Locate sensors over an open level area at least 9 m (EPA) in diameter. The
surface should be covered by short grass, or where grass does not grow, the
natural earth surface. Locate sensors away from objects at least a distance
equal to four times the height of the objects, and at least 30 m (EPA) from

7

Model 083E Relative Humidity and Temperature Sensor

large paved areas. Protect sensors from thermal radiation and ensure adequate
ventilation.

Standard measurement heights:

1.5 m (AASC)

1.25 to 2.0 m (WMO)

2.0 m (EPA)

See Section 10, References for a list of sources that discuss temperature and

relative humidity sensors and siting.

7.2 Mounting

8

FIGURE 7-1. 092 mounted in 41003-5 radiation shield

7.3 Wiring Instructions

Model 083E Relative Humidity and Temperature Sensor

Datalogger

083E Pin

Number

(pin F not used)

A White Power 12V

B Green Ground Signal Ground G G

C Blue Signal ref

D Black

E Red Signal temp

Clear Shield Shield

Wire

Color Cable Label Description

+10 to +18

Vdc

RH Analog

Output

Signal reference

temperature

Temperature

Common

Temperature

Signal

Datalogger

Channel

CR800

CR850
CR5000
CR3000
CR1000

CR23X

12V 12V

SE SE

SE SE

EX or VX EX or VX

Channel

CR10(X)

CR500
CR510

AG

G

Jumped
Resistor

28430

Jump resistor
between SE and
VX

7.4 Programming

This section is for users who write their own CRBasic datalogger programs.

To use the Short Cut program builder, see Section 4, Quickstart.

7.4.1 Programming Example

Table 7-1 describes the sensor wiring used with the following example
CRBasic datalogger program.

TABLE 7-1. 083E Sensor Wiring for Example Program

Wire

Color

White Power 12V 12V
Green Ground G

Blue Signal ref SE1

Black

Red Signal temp SE8

Clear Shield

Cable Label

Signal reference

temperature

Datalogger

Channel

CR1000

VX1

Jumped
Resistor

28430

Jump resistor
between SE8
and VX1

9

Model 083E Relative Humidity and Temperature Sensor

'CR1000 program to measure 083E-L
Public MetOne_083E_Temp
Public MetOne_083E_RH

DataTable(Table1,True,-1)
DataInterval(0,10,Min,10)
Average(1,MetOne_083E_Temp,FP2,False)
Sample(1,MetOne_083E_RH,FP2)
EndTable

'Main Program
BeginProg
Scan (5,Sec,1,0)

'MetOne 083E Temperature in Degrees C
BrHalf (MetOne_083E_Temp,1,mV2500,8,Vx1,1,2000,True ,0,_60Hz,-178.89,105.99)

'MetOne 083E Relative Humidity
VoltSe (MetOne_083E_RH,1,mv2500C,2,1,0,_60Hz,0.1,0)

CallTable(Table1)

NextScan
EndProg

8. Operation

8.1 Sensor Verification

To verify correct wiring and test the basic sensor operation, blow on the sensor.
The moisture in your breath should cause the relative humidity reading to rise.

To ensure proper operation, check the output data against a relative humidity
and temperature measuring device such as a psychrometer. Local weather
service data should be used only as a guideline since relative humidity and
temperature can vary significantly over short distances and over brief periods
of time.

10

Model 083E Relative Humidity and Temperature Sensor

8.2 Limitations of RH Measurements at Below Freezing Temperatures

The relative humidity measurement is referenced to saturated water vapor
pressure above liquid water. When air temperature is below freezing, the
maximum theoretical measurement range is limited as follows:

Air Temperature

(Deg C)

0 100

-5 96

-10 92

-15 88

-20 84

-25 80

-30 76

-35 72

-40 68

-45 64

-50 60

Maximum RH

(%)

11

Model 083E Relative Humidity and Temperature Sensor

8.3 Temperature Table

The temperature sensor is a resistive device. A resistance measurement across
the red and black leads of the 083E should equal the resistances listed in Table
8-1 at the stated temperatures.

TABLE 8-1. Model 083E-1-X Temperature vs. Sensor Resistance

YSI thermistor bead 44212

Temp ( ° C) RCAL (Ω Ohms) Temp ( ° C) RCAL (Ω Ohms) Temp ( ° C) RCAL (Ω Ohms)

-50 158181 -16 49648 18 22404

-49 150561 -15 48389 19 21908

-48 143555 -14 47173 20 21423

-47 137093 -13 45997 21 20949

-46 131114 -12 44861 22 20484

-45 125564 -11 43761 23 20029

-44 120400 -10 42696 24 19583

-43 115583 -9 41665 25 19147

-42 111079 -8 40665 26 18719

-41 106858 -7 39696 27 18300

-40 102895 -6 38755 28 17889

-39 99166 -5 37843 29 17487

-38 95651 -4 36957 30 17092

-37 92333 -3 36097 31 16705

-36 89196 -2 35260 32 16325

-35 86224 -1 34447 33 15952

-34 83406 0 33657 34 15586

-33 80729 1 32888 35 15227

-32 78183 2 32139 36 14875

-31 75760 3 31410 37 14529

-30 73449 4 30700 38 14190

-29 71245 5 30009 39 13856

-28 69138 6 29335 40 13528

-27 67124 7 28677 41 13206

-26 65195 8 28037 42 12890

-25 63348 9 27411 43 12579

-24 61576 10 26801 44 12274

-23 59875 11 26206 45 11974

-22 58242 12 25624 46 11678

-21 56671 13 25056 47 11388

-20 55160 14 24501 48 11102

-19 53705 15 23959 49 10822

-18 52303 16 23429 50 10545

-17 50952 17 22911

12

Following are polynomial expressions derived from Table 8-1.

T

= ((((R

c

= ((((-129.163 Tc) + 13698.3) ⎯1) – 23100 ⎯1)

R

t

⎯1

) + (23100 ⎯1)) ⎯1) – 13698.3) ⁄ -129.163

t

⎯1

Where: Tc = temperature in °C and Rt = sensor resistance in ohms (Ω)

Model 083E Relative Humidity and Temperature Sensor

9. Maintenance and Troubleshooting

9.1 Maintenance Schedule

The 083E is designed to operate for an extended period with minimum
maintenance. However, it can be damaged by untrained personnel attempting
disassembly or calibration.

6 – 12 Month Intervals:

• Inspect the sensor for proper operation per Section 8.1, Sensor

Verification.

12 Month Interval:

• Return the sensor to Campbell Scientific for calibration and

replacement of the O-rings and the filter membrane.

10. References

AASC, 1985: The State Climatologist (1985) Publication of the American

Association of State Climatologists: Heights and Exposure Standards for
Sensors on Automated Weather Stations, v. 9, No. 4 October, 1985.
(http://www.stateclimate.org/publications/state-climatologist/NOAA-

NCY-SCBOOKS-SC77097/00000029.pdf)

EPA, 2000: Meteorological Monitoring Guidance for Regulatory Modeling

Applications, EPA-454/R-99-005. Office of Air Quality Planning and
Standards, Research Triangle Park, North Carolina 27711

EPA, 2008: Quality Assurance Handbook for Air Pollution Measurement

Systems, Vol. IV, Meteorological Measurements, Ver. 2.0, EPA-454/B­08-002 (revised 2008). Office of Air Quality Planning and Standards,
Research Triangle Park, NC 27711

Goff, J. A. and S. Gratch, 1946: Low-pressure properties of water from -160°

to 212°F, Trans. Amer. Soc. Heat. Vent. Eng., 51, 125-164.

Lowe, P. R., 1977: An approximating polynomial for the computation of

saturation vapor pressure, J. Appl. Meteor., 16, 100-103.

Meyer, S. J. and K. G. Hubbard, 1992: Nonfederal Automated Weather

Stations and Networks in the United States and Canada: A Preliminary

Survey, Bulletin Am. Meteor. Soc. 73, No. 4, 449-457.

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, 7
Geneva, Switzerland.

th

edition,

13

Model 083E Relative Humidity and Temperature Sensor

14

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