Campbell HygroVUE 5 Product Manual
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Campbell HygroVUE 5 Product Manual

Temperature and relative humidity sensor
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Revision: 02/2020
Copyright ©
2020
Campbell Scientific
CSL I.D - 1306

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  • Page 1 Revision: 02/2020 Copyright © 2020 Campbell Scientific CSL I.D - 1306...
  • Page 3 Quotations for repairs can be given on request. It is the policy of Campbell Scientific to protect the health of its employees and provide a safe working environment, in support of this policy a “Declaration of Hazardous Material and Decontamination”...
  • Page 5 PLEASE READ FIRST About this manual Please note that this manual was originally produced by Campbell Scientific Inc. primarily for the North American market. Some spellings, weights and measures may reflect this origin. Some useful conversion factors: Area: 1 in...
  • Page 7 • 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...

  • Page 9: 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 7.3 SDI-12 programming 7.4 Siting 7.4.1 Installation in a RAD06 radiation shield 7.4.2 Mount the shield 8.
  • Page 10 Appendix B. Example programs B.1 CRBasic example program B.2 CRBasic example program for the CR200 series Appendix C. Environmental performance C.1 Exposure to pollutants C.2 Operating range of the RH element C.3 Measurement below 0 °C Appendix D. SDI-12 sensor support D.1 SDI-12 command basics D.1.1 Acknowledge active command (a!) D.1.2 Send identification command (al!)

  • Page 11: Introduction

    Relative Humidity and Temperature sensors. The HygroVUE sensors feature a low maintenance design with a highly stable and accurate replaceable RH chip that will lower the total cost of deployment throughout a network. The HygroVUE 5 uses the SDI-12 communications protocol to communicate with any SDI-12 recorder, simplifying wiring and programming.

  • Page 12: Quickstart

    Sensors > Meteorological > Relative Humidity & Temperature folder. Double-click HygroVUE5/HygroVUE10 Temperature & Relative Humidity Sensor. NOTE: If the HygroVUE does not appear in the list, upgrade Short Cut to the latest version from the Campbell Scientific website. HygroVUE™5 Temperature and Relative Humidity Sensor...
  • Page 13 Celsius. This can be changed by clicking the Deg C box and selecting Deg F, for degrees Fahrenheit, or K for Kelvin. SDI-12 Address defaults to 0. Enter the correct SDI-12 Address for the HygroVUE 5 if it has been changed from the factory-set default value.
  • Page 14 Data Output Storage Interval. Click Next. NOTE: Making measurements from the HygroVUE 5 more frequently than 5 seconds can result in small additional errors due to self-heating of the element. If the main scan rate needs to be faster than this, please read Sensor measurement (p.

  • Page 15: Overview

    5. Overview The HygroVUE 5 sensor uses a single chip element that incorporates both a temperature and an RH sensor. Each element is individually calibrated with the calibration corrections stored on the chip. The element is easily changed in the field, reducing downtime and calibration costs.

  • Page 16: Temperature Measurement

    50 µA quiescent, typical Current consumption: 0.6 mA during 0.5 s measurement typical Sensor normally powered all the time, if power is switched allow Warm-up time: 1.8 s for sensor power-up. 12.5 mm (0.49 in) at sensor tip, maximum 16 mm (0.63 in) at the Diameter: cable end 115 mm (4.52 in) , sensor only, without cable...

  • Page 17: Relative Humidity Measurement

    6.2 Relative humidity measurement Operating range: 0 to 100% RH Accuracy (at 25°C)*: Over the range 0-80% RH: ±1.8% Over the range 80-100% RH: ±3% Temperature dependence: < ±1% RH (–40 to 60 °C) Short term hysteresis: < ±1% RH Long-term stability: ±0.5% per year (drift in clean air conditions) Reported resolution:...

  • Page 18: Data Logger Programming

    For the CR6 and CR1000X, triggering conflicts may occur when a companion terminal is used for a triggering instruction such as TimerInput(), PulseCount(), or WaitDigTrig(). For example, if the HygroVUE 5 is connected to C3 on a CR1000X, C4 cannot be used in the TimerInput(), PulseCount(), or WaitDigTrig() instructions.

  • Page 19: Sdi-12 Programming

    (p. 22). NOTE: Making measurements from the HygroVUE 5 more frequently than every 5 seconds can result in small additional errors due to self-heating of the element. If the main scan rate needs to be faster than this please read Sensor measurement (p.
  • Page 20 The Apogee Instruments aspirated TS100SS shield can also be used where minimal solar errors and a fast speed of response is desired. A special adapter is available to allow the HygroVUE 5 to fit within the shield. Please refer for the documentation for that shield for further installation instructions.

  • Page 21: Installation In A Rad06 Radiation Shield

    1/2 to 1 turn. Do not overtighten the nut as you risk damaging the sensor body and also making service of the sensor more difficult in the future. FIGURE 7-1. HygroVUE 5 detail of insertion in a RAD06 shield 7.4.2 Mount the shield 1.

  • Page 22: Operation

    FIGURE 7-2. HygroVUE 5 installed in a RAD06 radiation shield on a pole 8. Operation 8.1 Sensor measurement 8.2 Measurements in programs with fast scan rates 8.3 Long cables 8.4 Power conservation 8.5 Measuring multiple SDI-12 sensors 8.1 Sensor measurement...
  • Page 23 For the HygroVUE 5 this instruction is rarely used because the instruction takes longer to execute than the M or R commands.

  • Page 24: Measurements In Programs With Fast Scan Rates

    The HygroVUE 5 also supports the MC, CC, and RC instructions, which are the same as the M, C, and R instructions, but a cyclic redundancy check (CRC) is added that validates the data. Use of the checksum option is only normally necessary for long cable runs.

  • Page 25: Power Conservation

    In very low-power applications, conserve battery power by turning the 12 V supply to the HygroVUE 5 on just before the measurement (allowing a warm-up time of at least 1.8 s) and then turning it off afterwards. If available, the switched 12 V output of the data logger can be used.

  • Page 26: Troubleshooting

    Swap the element for another one. 9.2 Maintenance The HygroVUE 5 sensor requires minimal maintenance, but dust, debris, and salts on the filter cap will degrade sensor performance. Check the white filter on the end of the sensor for debris. If dirt or salt is ingrained in the filter, clean with distilled water or replace it.

  • Page 27: Calibration

    NOTE: The HygroVUE 5 sensor body is sealed and filled with a potting compound to totally protect the electronics from any water ingress. This means there are no serviceable parts within the sensor body.
  • Page 28 NOTE: If dirt, salt or grease are left on the face of the sensor element during the process of handling the element, it may influence the measurements made. 2. Disconnect the sensor from the 12 V power supply. 3. Remove the filter by unscrewing it counter clockwise when looking towards the tip of the sensor.
  • Page 29 the incorrect orientation or that the legs of the element have been bent. Screw the filter onto the thread and tighten gently with your fingers. CAUTION: Only tighten the filter approximately 1/8th of a turn by hand when the filter is fully screwed onto the thread.

  • Page 30: Attributions And References

    FIGURE 9-2. Incorrect fit of the 4-pin sensor element (side view) 10. Attributions and 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.

  • Page 31: Appendix A. Importing Short Cut Code Into Crbasic Editor

    Appendix A. Importing Short Cut code into CRBasic Editor Short Cut creates a .DEF file that contains wiring information and a program file that can be imported into the CRBasic Editor. By default, these files reside in the C:\campbellsci\SCWin folder. Import Short Cut program file and wiring information into CRBasic Editor: 1.

  • Page 33: Appendix B. Example Programs

    This CR1000X program can be adapted for use with the CR300, CR6, CR800 series, CR1000, CR3000, and CR5000 data loggers. CRBasic Example 1: CR1000X program measuring the HygroVUE 5 'Program measures one HygroVUE 5 sensor every 10 seconds and stores the 'average temperature and a sample of relative humidity every 10 minutes. 'Wiring Diagram...

  • Page 34: Crbasic Example Program For The Cr200 Series

    EndProg B.2 CRBasic example program for the CR200 series This example program shows the measurement of a single HygroVUE 5 and can be used directly with CR200(X) series data loggers. CRBasic Example 2: CR200(X) program measuring the HygroVUE 5 'CR200(X) Series Data Logger 'Program measures one HygroVUE 5 sensor every 30 seconds and stores the 'average temperature and a sample of relative humidity every 10 minutes.
  • Page 35 CRBasic Example 2: CR200(X) program measuring the HygroVUE 5 DataInterval (0,10,Min) Average (1,AirTC,False) Sample (1,RH) EndTable 'Main Program BeginProg Scan (30,Sec) 'Scan every 30 seconds 'HygroVUE 5 Temperature & Relative Humidity Sensor measurements 'AirTC' 'and 'RH' SDI12Recorder (TRHData(), "0M!" ,1,0)

  • Page 37: Appendix C. Environmental Performance

    Appendix C. Environmental performance This appendix details tests and limitations of the sensor when exposed to extremes of the environment. C.1 Exposure to pollutants All capacitive sensors are susceptible to pollutants to some degree. The vapours may interfere with the polymer layers used in the structure of the sensing element. The diffusion of chemicals into the polymer may cause temporary or even permanent shifts in both offset and sensitivity.

  • Page 38: Measurement Below 0 °C

    World Meteorological Organization. If an RH value is required to be referenced to ice, the HygroVUE 5 readings will need to be corrected. Please refer to standard text points on this matter for the correction required.

  • Page 39: Appendix D. Sdi-12 Sensor Support

    An active sensor responds to each command. Responses have several standard forms and always terminate with <CR><LF> (carriage return and line feed). Standard SDI-12 commands are listed Table D-1 (p. 28). NOTE: The HygroVUE 5 does not support all variants of the commands in the following table. HygroVUE™5 Temperature and Relative Humidity Sensor...

  • Page 40: Acknowledge Active Command (A!)

    Table D-1: Campbell Scientific sensor SDI-12 command and response set Response Name Command Acknowledge Active a<CR><LF> allccccccccmmmmmmvvvxxx...xx Send Identification <CR><LF> Start Verification atttn <CR><LF> Address Query a<CR><LF> aAb! Change Address b<CR><LF> Start Measurement atttn<CR><LF> aM1!...aM9! aMC! Start Measurement atttn <CR><LF>...

  • Page 41: Start Verification Command (Av!)

    sensor model information. Serial number or other sensor specific information may also be included. allccccccccmmmmmmvvvxxx...xx<CR><LF> Sensor SDI-12 address SDI-12 version number (indicates compatibility) cccccccc 8-character vendor identification mmmmmm 6 characters specifying the sensor model 3 characters specifying the sensor version (operating system) Up to 13 optional characters used for a serial number or other specific xxx…xx sensor information that is not relevant for operation of the data logger...

  • Page 42: Start Measurement Commands (Am!)

    NOTE: Only one sensor should be connected to a particular terminal at a time when changing addresses. D.1.6 Start measurement commands (aM!) A measurement is initiated with the M! command. The response to each command has the form atttn<CR><LF>, where a = sensor address ttt = time, in seconds, until measurement data is available.
  • Page 43 To use this command, the scan interval should be 10 seconds or less. The response to each command has the form atttn<CR><LF>, where a = the sensor address ttt = time, in seconds, until the measurement data is available nn = the number of values to be returned when one or more subsequent D commands are issued.

  • Page 44: Start Measurement Commands With Cyclic Redundancy Check (Amc! And Acc!)

    Table D-3: Example aC! sequence 10 seconds later, after a total of 30 seconds have passed, the data logger starts the process of XD0! collecting data from sensor X by issuing the first D command. The sensor immediately responds with the sensor X+1+2+3+4+5<CR><LF>...

  • Page 45: Continuous Measurement Command (Ar0

    or aMC!, the data logger issues the aD0! command once a service request has been received from the sensor or the reported time has expired. When the data logger is issuing concurrent commands (aC! or aCC!), the Send Data command is issued after the required time has elapsed (no service request will be sent by the sensor).

  • Page 46: Changing An Sdi-12 Address

    Transparent mode is entered while the computer is communicating with the data logger through a terminal emulator program. It is accessed through Campbell Scientific data logger support software or other terminal emulator programs. Data logger keyboards and displays cannot be used.

  • Page 47: Changing An Sdi-12 Address - Cr200(X) Series

    exited. In that case, simply type SDI12 again, press Enter, and type the correct control port number when prompted. 10. To change the SDI-12 address, type aAb!, where a is the current address from the previous step and b is the new address (see FIGURE D-1 (p.
  • Page 48 3. Under Select Device, located in the lower left side of the window, select the CR200Series station. 4. Click Open Terminal. 5. Select All Caps Mode. 6. Press Enter until the data logger responds with the CR2XX> prompt. 7. Type SDI12 and press Enter. 8.

  • Page 49: Appendix E. Sensor Element Calibration

    The sensor elements are individually calibrated during manufacture. The manufacturer publishes a statement (see FIGURE E-1 (p. 37)) as a description of and evidence of traceability of the calibration of the HygroVUE 5 sensor element. FIGURE E-1. Calibration certificate HygroVUE™5 Temperature and Relative Humidity Sensor...
  • Page 50 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 Location: Bremen, Germany Location: Shepshed, Loughborough, UK Phone:...

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