Campbell HygroVUE 5 User manual

Revision: 02/2020
Copyright © 2020
Campbell Scientific
CSL I.D - 1306

Guarantee
This equipment is guaranteed against defects in materials and workmanship.
We will repair or replace products which prove to be defective during the
guarantee period as detailed on your invoice, provided they are returned to us
prepaid. The guarantee will not apply to:

Equipment which has been modified or altered in any way without the
written permission of Campbell Scientific

Batteries

Any product which has been subjected to misuse, neglect, acts of God or
damage in transit.
Campbell Scientific will return guaranteed equipment by surface carrier
prepaid. Campbell Scientific will not reimburse the claimant for costs incurred
in removing and/or reinstalling equipment. This guarantee and the Company’s
obligation thereunder is in lieu of all other guarantees, expressed or implied,
including those of suitability and fitness for a particular purpose. Campbell
Scientific is not liable for consequential damage.
Please inform us before returning equipment and obtain a Repair Reference
Number whether the repair is under guarantee or not. Please state the faults as
clearly as possible, and if the product is out of the guarantee period it should
be accompanied by a purchase order. 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” form will be
issued for completion.
When returning equipment, the Repair Reference Number must be clearly
marked on the outside of the package. Complete the “Declaration of
Hazardous Material and Decontamination” form and ensure a completed copy
is returned with your goods. Please note your Repair may not be processed if
you do not include a copy of this form and Campbell Scientific Ltd reserves
the right to return goods at the customers’ expense.
Note that goods sent air freight are subject to Customs clearance fees which
Campbell Scientific will charge to customers. In many cases, these charges are
greater than the cost of the repair.
Campbell Scientific Ltd,
80 Hathern Road,
Shepshed, Loughborough, LE12 9GX, UK
Tel: [phone]
Fax: [phone]
Email: [e-mail]
www.campbellsci.co.uk

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 in2(square inch) = 645 mm2
Length: 1 in. (inch) = 25.4 mm
1 ft (foot) = 304.8 mm
1 yard = 0.914 m
1 mile = 1.609 km
Mass: 1 oz. (ounce) = 28.35 g
1 lb (pound weight) = 0.454 kg
Pressure: 1 psi (lb/in2) = 68.95 mb
Volume: 1 UK pint = 568.3 ml
1 UK gallon = 4.546 litres
1 US gallon = 3.785 litres
In addition, while most of the information in the manual is correct for all countries, certain information
is specific to the North American market and so may not be applicable to European users.
Differences include the U.S standard external power supply details where some information (for
example the AC transformer input voltage) will not be applicable for British/European use. Please note,
however, that when a power supply adapter is ordered it will be suitable for use in your country.
Reference to some radio transmitters, digital cell phones and aerials may also not be applicable
according to your locality.
Some brackets, shields and enclosure options, including wiring, are not sold as standard items in the
European market; in some cases alternatives are offered. Details of the alternatives will be covered in
separate manuals.
Part numbers prefixed with a “#” symbol are special order parts for use with non-EU variants or for
special installations. Please quote the full part number with the # when ordering.
Recycling information
At the end of this product’s life it should not be put in commercial or domestic refuse but
sent for recycling. Any batteries contained within the product or used during the
products life should be removed from the product and also be sent to an appropriate
recycling facility.
Campbell Scientific Ltd can advise on the recycling of the equipment and in some cases
arrange collection and the correct disposal of it, although charges may apply for some
items or territories.
For further advice or support, please contact Campbell Scientific Ltd, or your local agent.
Campbell Scientific Ltd, 80 Hathern Road, Shepshed, Loughborough, LE12 9GX,
UK Tel: [phone] Fax: [phone]
Email: [e-mail]
www.campbellsci.co.uk

Safety
DANGER —MANY HAZARDS ARE ASSOCIATED WITH INSTALLING, USING, MAINTAINING, AND WORKING ON
OR AROUND TRIPODS, TOWERS, AND ANY ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS,
CROSSARMS, ENCLOSURES, ANTENNAS, ETC. FAILURE TO PROPERLY AND COMPLETELY ASSEMBLE,
INSTALL, OPERATE, USE, AND MAINTAIN TRIPODS, TOWERS, AND ATTACHMENTS, AND FAILURE TO HEED
WARNINGS, INCREASES THE RISK OF DEATH, ACCIDENT, SERIOUS INJURY, PROPERTY DAMAGE, AND
PRODUCT FAILURE. TAKE ALL REASONABLE PRECAUTIONS TO AVOID THESE HAZARDS. CHECK WITH YOUR
ORGANIZATION'S SAFETY COORDINATOR (OR POLICY) FOR PROCEDURES AND REQUIRED PROTECTIVE
EQUIPMENT PRIOR TO PERFORMING ANY WORK.
Use tripods, towers, and attachments to tripods and towers only for purposes for which they are designed. Do not
exceed design limits. Be familiar and comply with all instructions provided in product manuals. Manuals are
available at www.campbellsci.eu or by telephoning [phone] (UK). You are responsible for conformance
with governing codes and regulations, including safety regulations, and the integrity and location of structures or land
to which towers, tripods, and any attachments are attached. Installation sites should be evaluated and approved by a
qualified engineer. If questions or concerns arise regarding installation, use, or maintenance of tripods, towers,
attachments, or electrical connections, consult with a licensed and qualified engineer or electrician.
General
•Prior to performing site or installation work, obtain required approvals and permits. Comply with all
governing structure-height regulations, such as those of the FAA in the USA.
•Use only qualified personnel for installation, use, and maintenance of tripods and towers, and any
attachments to tripods and towers. The use of licensed and qualified contractors is highly recommended.
•Read all applicable instructions carefully and understand procedures thoroughly before beginning work.
•Wear a hardhat and eye protection, and take other appropriate safety precautions while working on or
around tripods and towers.
•Do not climb tripods or towers at any time, and prohibit climbing by other persons. Take reasonable
precautions to secure tripod and tower sites from trespassers.
•Use only manufacturer recommended parts, materials, and tools.
Utility and Electrical
•You can be killed or sustain serious bodily injury if the tripod, tower, or attachments you are installing,
constructing, using, or maintaining, or a tool, stake, or anchor, come in contact with overhead or
underground utility lines.
•Maintain a distance of at least one-and-one-half times structure height, or 20 feet, or the distance
required by applicable law, whichever is greater, between overhead utility lines and the structure (tripod,
tower, attachments, or tools).
•Prior to performing site or installation work, inform all utility companies and have all underground utilities
marked.
•Comply with all electrical codes. Electrical equipment and related grounding devices should be installed
by a licensed and qualified electrician.
Elevated Work and Weather
•Exercise extreme caution when performing elevated work.
•Use appropriate equipment and safety practices.
•During installation and maintenance, keep tower and tripod sites clear of un-trained or non-essential
personnel. Take precautions to prevent elevated tools and objects from dropping.
•Do not perform any work in inclement weather, including wind, rain, snow, lightning, etc.
Maintenance
•Periodically (at least yearly) check for wear and damage, including corrosion, stress cracks, frayed cables,
loose cable clamps, cable tightness, etc. and take necessary corrective actions.
•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
SUCH AS SENSORS, CROSSARMS, ENCLOSURES, ANTENNAS, ETC.

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 7
7. Installation 7
7.1 Wiring to data logger 7
7.2 Data logger programming 8
7.3 SDI-12 programming 9
7.4 Siting 9
7.4.1 Installation in a RAD06 radiation shield 11
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
10. Attributions and references 20
Appendix A. Importing Short Cut code into CRBasic Editor 21
Table of Contents - iv

Appendix B. Example programs 22
B.1 CRBasic example program 22
B.2 CRBasic example program for the CR200 series 23
Appendix C. Environmental performance 25
C.1 Exposure to pollutants 25
C.2 Operating range of the RH element 25
C.3 Measurement below 0 °C 26
Appendix D. SDI-12 sensor support 27
D.1 SDI-12 command basics 27
D.1.1 Acknowledge active command (a!) 28
D.1.2 Send identification command (al!) 28
D.1.3 Start verification command (aV!) 29
D.1.4 Address query command (?!) 29
D.1.5 Change address command (aAb!) 29
D.1.6 Start measurement commands (aM!) 30
D.1.7 Start concurrent measurement commands (aC!) 30
D.1.8 Start measurement commands with cyclic redundancy check (aMC! and aCC!) 32
D.1.9 Stopping a measurement command 32
D.1.10 Send data command (aD0! … aD9!) 32
D.1.11 Continuous measurement command (aR0! … aR9!) 33
D.2 References 33
D.3 SDI-12 transparent mode 33
D.3.1 Changing an SDI-12 address 34
D.3.2 Changing an SDI-12 address — CR200(X) Series 35
Appendix E. Sensor element calibration 37
Table of Contents - v

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.
Before using the HygroVUE 5 please study:
lPrecautions (p. 1)
lSafety (p. iii)
2. Precautions
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.eu/videos/cr1000x-datalogger-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.eu. It is included in
installations of LoggerNet, RTDAQ, PC400, or PC200W.
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.
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 2

4. On selection a new window opens as shown in the following image. This has two tabs. In
the properties tab you can change the name and units of measurement. 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.
5. In the wiring tab the connections to the data logger are shown. Click Next after wiring the
sensor.
6. Select any other sensors you have, and then click Next.
HygroVUE™5 Temperature and Relative Humidity Sensor 3

7. In Output Setup, type the scan rate (5 seconds or longer), meaningful table names, and the
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. 12) and Measurements
in programs with fast scan rates (p. 14) about alternate programming techniques.
8. Select the measurement and its associated output option.
HygroVUE™5 Temperature and Relative Humidity Sensor 4

9. Click Finish and save the program. Send the program just created to the data logger if the
data logger is connected to the computer.
10. If the sensor is connected to the data logger, check the output of the sensor in the data
display in LoggerNet, RTDAQ, PC400, or PC200W to make sure it is making reasonable
measurements.
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.
Electronics within the HygroVUE 5 control the measurement made by the sensor element, apply
temperature and linearization corrections to the readings, and present the data via SDI-12 to a
data logger.
A stainless steel mesh filter minimizes the effects of dust and dirt on the sensor while allowing air
exchange around the sensor element and reducing the chances of condensation remaining
inside the filter cap. A small PTFE membrane filter is bonded to the surface of the element which
prevents any finer dust or mould from directly influencing the measurement.
The sensor housing is designed to withstand permanent exposure to all weather and to fit into a
range of radiation shields, including compact shields.
6. Specifications
Compatibility:
lCompatible with Campbell Scientific data loggers CR6 series, CR3000, CR1000X series,
CR800 series, CR300 series, CR1000, CR200(X) series, and CR5000.
lDigital SDI-12 output which is fully SDI-12 V1.3 compliant (verified with an SDI-12 Verifier
(www.sdi-12-verifier.com). It is compatible with SDI-12 V1.4 recorders.
Sensor element: Sensirion SHT35 derivative
Calibration traceability: NIST and NPL standards. See Sensor element calibration (p. 37)
for details of calibration traceability.
Supply voltage: 7 to 28 VDC
HygroVUE™5 Temperature and Relative Humidity Sensor 5

Current consumption:
Warm-up time:
Diameter:
Length:
Housing material:
Housing classification:
Sensor protection:
EMC compliance:
Calibration:
Compliance documents:
50 µA quiescent, typical
0.6 mA during 0.5 s measurement typical
Sensor normally powered all the time, if power is switched allow
1.8 s for sensor power-up.
12.5 mm (0.49 in) at sensor tip, maximum 16 mm (0.63 in) at the
cable end
115 mm (4.52 in), sensor only, without cable
White PET-P
IP67 (electronics housing)
Outer glass-filled polypropylene cap fitted with a stainless steel
mesh dust filter with nominal pore size of <30 µm. The sensor
element is fitted with a PTFE protective film with a filtration
efficiency of >99.99% for particles of 200 nm or larger size.
Tested and conforms to IEC61326:2013
The sensor element is individually calibrated during manufacture.
View at www.campbellsci.eu/hygrovue5
6.1 Temperature measurement
Operating range: –40 to 70 °C
Accuracy*: Over the range –40 to 70 °C: ±0.4 °C
Over the range –20 to 60 °C: ±0.3 °C
Long term drift: <±0.03 °C/year
Reported resolution: 0.001 °C
Repeatability**: 0.04 °C
Response time: 130 s (63% response time in air moving at 1 m/s)
Units: Degrees Celsius
*The accuracy figures quoted are relative to factory standards.
**Values are 3 standard deviations of 25 measurements at constant temperature.
HygroVUE™5 Temperature and Relative Humidity Sensor 6

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: 0.001% RH
Repeatability**: 0.05% RH
Response time with filter: 8 s (63% response time in air moving at 1 m/s @ 25 °C)
Environmental performance: See Environmental performance (p. 25)
*The accuracy figures quoted are relative to factory standards.
**Values are 3 standard deviations of 25 measurements at constant humidity.
7. Installation
If you are programming your data logger with Short Cut, skip Wiring to data logger (p. 7) and
Data logger programming (p. 8). Short Cut does this work for you. See QuickStart (p. 2) for a
Short Cut tutorial.
7.1 Wiring to data logger
The sensor is fitted with a tough, polyurethane sheathed cable. This has three conductors plus a
shield wire. The wiring of the sensor is shown in Table 7-1 (p. 8).
HygroVUE™5 Temperature and Relative Humidity Sensor 7

Table 7-1: Wire colour, pin, function, and data logger connection
Pin Wire colour Wire function Data logger connection terminal
1 Brown Power 12V
2 White SDI-12 Cterminal1or Uterminal
configured for SDI-122
3 Black Power ground G
Clear Shield G
1Dedicated SDI-12 port on CR5000
2Uterminals are automatically configured by the measurement instruction.
To use more than one sensor per data logger, either connect the different sensors to different
terminals on the data logger or change the SDI-12 addresses of the sensors and wire them to the
same terminal. Using the SDI-12 address reduces the use of terminals on the data logger and
allows sensors to be connected in a daisy-chain fashion that can minimize cable runs in some
applications. (See Long cables (p. 14) for limits on the total cable length.)
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.
The SDI-12 address of the HygroVUE 5 can be set two ways:
lby sending the required commands to the sensors via an SDI-12 recorder/data logger that
allows talk through to the sensor.
lby loading a program into the recorder that sends the required commands.
See SDI-12 sensor support (p. 27) for detailed instructions.
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.
NOTE:
Short Cut cannot edit programs after they are imported and edited in CRBasic Editor.
HygroVUE™5 Temperature and Relative Humidity Sensor 8

A Short Cut tutorial is available in QuickStart (p. 2). If you wish to import Short Cut code into
CRBasic Editor to create or add to a customized program, follow the procedure in Importing
Short Cut code into CRBasic Editor (p. 21). Programming basics for CRBasic data loggers are
provided in the following section. Complete program examples for select CRBasic data loggers
can be found in Example programs (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. 12) and Measurements in programs with
fast scan rates (p. 14) about alternate programming techniques.
7.3 SDI-12 programming
The SDI12Recorder() instruction is used to measure a HygroVUE 5 configured for SDI-12
measurements. This instruction sends a request to the sensor to make a measurement and then
retrieves the measurement from the sensor. See Sensor measurement (p. 12) for more
information.
For most data loggers, the SDI12Recorder() instruction has the following syntax:
SDI12Recorder(Destination, SDIPort, SDIAddress, “SDICommand”, Multiplier,
Offset, FillNAN, WaitonTimeout)
For the SDIAddress, alphabetical characters need to be enclosed in quotes (for example, “A”).
Also enclose the SDICommand in quotes as shown. The Destination parameter must be an
array. The required number of values in the array depends on the command (see Table 8-1
(p. 13)).
FillNANand WaitonTimeoutare optional parameters (refer to CRBasic Help for more
information).
7.4 Siting
The general guidance for standard meteorological stations is to locate the sensor over an open,
level area at least 9 m (29.5 ft) (EPA) in diameter. The surface should be covered by short grass or
the natural earth surface where grass does not grow. Sensors should be located at a distance of
at least four times the height of any nearby obstruction and at least 30 m (98.4 ft) (EPA) from
large, paved areas. Sensors should be protected from thermal radiation and adequately
ventilated. Protect the filter at the top of the sensor from exposure to liquid water.
HygroVUE™5 Temperature and Relative Humidity Sensor 9

The sensor should be installed at a standard measurement height which varies depending on the
guides being used:
l1.5 m (4.92 ft) (AASC)
l1.25 to 2.0 m (4.1 to 6.5 ft) (WMO)
l2.0 m (6.5 ft) (EPA).
See Attributions and references (p. 20) for a list of references that discuss temperature and
relative humidity sensors.
When used in the field, the HygroVUE 5 must be housed in a radiation shield. Typically, the
RAD06 6-plate radiation shield.Typically, the RAD06 unventilated or the TS100SS fan-aspirated
solar radiation shield is used.
The white colour of these shields reflects solar radiation, and the louvered construction allows air
to pass freely through, thereby keeping the sensor at or near ambient temperature. The RAD06
uses a double-louvered design that offers improved sensor protection from insect intrusion and
driving rain and snow. In addition, compared to shields of a similar appearance, the RAD shields
have lower self-heating in bright sunlight combined with low wind speeds giving a better
measurement. The RAD06 attaches to a crossarm, mast, or pipe with a 2.5 to 5.3 cm (1.0 to 2.1
inch) outer diameter.
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.
Each of these solar radiation shields attaches to a crossarm, mast, or user-supplied pipe with a 2.5
to 5.3 cm (1.0 to 2.1 inch) outer diameter.
Tools required for installing a radiation shield to a tripod or tower include:
ladjustable wrench (to suit 12 mm (1/2 in) nuts)
lsmall screwdriver provided with data logger
lsmall Phillips screwdriver
lUV-resistant cable ties
lsmall pair of diagonal-cutting pliers
ladjustable wrench with a minimum 50 mm (2 in) jaw size.
HygroVUE™5 Temperature and Relative Humidity Sensor 10