Campbell HygroVUE 5 User manual

Revision: 11/2022
Copyright © 2019– 2022
Campbell Scientific, Inc.

Table of contents
1. Introduction 1
2. Precautions 1
3. Initial inspection 1
4. QuickStart 2
5. Overview 5
6. Specifications 5
6.1 Temperature measurement 6
6.2 Relative humidity measurement 6
7. Installation 7
7.1 Wiring to data logger 7
7.2 Data logger programming 8
7.3 CRBasic programming 8
7.4 Siting 9
7.4.1 Installation in a RAD06 radiation shield 10
7.4.2 Mount the shield 11
8. Operation 12
8.1 Sensor measurement 12
8.2 Measurements in programs with fast scan rates 14
8.3 Long cables 14
8.4 Power conservation 15
8.5 Measuring multiple SDI-12 sensors 15
9. Troubleshooting and maintenance 15
9.1 Troubleshooting 16
9.2 Maintenance 16
9.3 Calibration 17
9.4 Sensor element replacement 17
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10. Attributions and references 19
Appendix A. Importing Short Cut code into CRBasic Editor 21
Appendix B. CRBasic example program 22
Appendix C. Environmental performance 24
C.1 Exposure to pollutants 24
C.2 Operating range of the RH element 24
C.3 Measurement below 0 °C 25
Appendix D. SDI-12 sensor support 26
D.1 SDI-12 command basics 26
D.1.1 Acknowledge active command (a!) 27
D.1.2 Send identification command (al!) 27
D.1.3 Start verification command (aV!) 28
D.1.4 Address query command (?!) 28
D.1.5 Change address command (aAb!) 28
D.1.6 Start measurement commands (aM!) 29
D.1.7 Start concurrent measurement commands (aC!) 29
D.1.8 Start measurement commands with cyclic redundancy check (aMC! and aCC!) 31
D.1.9 Stopping a measurement command 31
D.1.10 Send data command (aD0! … aD9!) 31
D.1.11 Continuous measurement command (aR0! … aR9!) 32
D.2 References 32
D.3 SDI-12 transparent mode 32
D.3.1 Changing an SDI-12 address 33
Appendix E. Sensor element calibration 36
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1. Introduction
The HygroVUE™5 Temperature and Relative Humidity Sensor is designed for general
meteorological and environmental applications. It is the entry level sensor in the HygroVUE line
of 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.
2. Precautions
lREAD AND UNDERSTAND the Safety section at the back of this manual.
lWhen opening the shipping package, do not damage or cut the cable jacket. If damage to
the cable is suspected, consult with a Campbell Scientific support engineer.
lAlthough rugged, the HygroVUE 5 should be handled as a precision scientific instrument.
3. Initial inspection
lCheck the packaging and contents of the shipment. If damage occurred during transport,
immediately file a claim with the carrier. Contact Campbell Scientific to facilitate repair or
replacement.
lCheck model information against the shipping documents to ensure the expected products
and the correct lengths of cable are received. Model numbers are found on each product.
On cables and cabled items, the model number is usually found at the connection end of
the cable. Report any shortages immediately to Campbell Scientific.
HygroVUE™5 Temperature and Relative Humidity Sensor 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.
The following procedure also shows using Short Cut to program the sensor.
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 HygroVUE5 or locate the sensor in the
Sensors >Meteorological >Relative Humidity & Temperature folder. Double-click
HygroVUE5/HygroVUE10 Temperature & Relative Humidity Sensor. Temperature units
default to degrees Celsius. This can be changed by clicking the Deg C box and selecting
Deg F, for degrees Fahrenheit, or Kfor 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.
HygroVUE™5 Temperature and Relative Humidity Sensor 2