Contents

Revision and copyright information
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 CRBasic programming
- 7.4 Siting
  - 7.4.1 Installation in a RAD06 radiation shield
  - 7.4.2 Mount the shield
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
9. Troubleshooting and maintenance
- 9.1 Troubleshooting
- 9.2 Maintenance
- 9.3 Calibration
- 9.4 Sensor element replacement
10. Attributions and references
Appendix A. Importing Short Cut code into CRBasic Editor
Appendix B. CRBasic example program
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!)
  - D.1.3 Start verification command (aV!)
  - D.1.4 Address query command (?!)
  - D.1.5 Change address command (aAb!)
  - D.1.6 Start measurement commands (aM!)
  - D.1.7 Start concurrent measurement commands (aC!)
  - D.1.8 Start measurement commands with cyclic redundancy check (aMC! and aCC!)
  - D.1.9 Stopping a measurement command
  - D.1.10 Send data command (aD0! aD9!)
  - D.1.11 Continuous measurement command (aR0! aR9!)
- D.2 References
- D.3 SDI-12 transparent mode
  - D.3.1 Changing an SDI-12 address
Appendix E. Sensor element calibration
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Campbell Scientific HygroVUE5 Product Manual

Campbell Scientific HygroVUE5 Sensor manual cover

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Campbell Scientific HygroVUE5 Sensor Specification

The Campbell Scientific HygroVUE5 Sensor is a compact and robust device designed for precise measurement of relative humidity and temperature in various environmental monitoring applications. It integrates a state-of-the-art capacitive polymer sensor element for humidity and a platinum resistance thermometer (PRT) for temperature, ensuring high accuracy and reliability. The sensor operates within a temperature range of -40°C to 70°C and a relative humidity range of 0% to 100%, providing versatile functionality in diverse climatic conditions.

The HygroVUE5 features a digital SDI-12 output, simplifying integration with data loggers and measurement systems commonly used in meteorological and hydrological research. This digital communication protocol allows for low-power consumption and extended cable runs, making the sensor ideal for remote field installations. The sensor housing is constructed from durable materials with an IP67 rating, providing excellent protection against dust and water ingress, which is essential for long-term outdoor deployments.

Accuracy is a key attribute of the HygroVUE5, with humidity measurements within ±2% RH and temperature measurements within ±0.2°C. The sensor offers rapid response times, critical for capturing transient environmental changes. Calibration of the sensor is facilitated by the use of a replaceable sensor module, ensuring ongoing optimal performance without the need for complex recalibration procedures.

Designed with ease of use in mind, the sensor's compact form factor allows for straightforward installation. Its resilience and precision make it suitable for a wide range of applications, from agricultural monitoring and climate research to industrial environmental control. The HygroVUE5 is a reliable choice for professionals seeking high-quality environmental data collection.

Campbell Scientific HygroVUE5 Sensor F.A.Q.

How do I properly install the Campbell Scientific HygroVUE5 Sensor?

To install the HygroVUE5 Sensor, mount the sensor in a location with good air circulation and away from direct sunlight. Use a radiation shield to protect against solar radiation and precipitation. Connect the sensor to a compatible data logger following the wiring diagram in the manual.

What is the recommended maintenance schedule for the HygroVUE5 Sensor?

Inspect the sensor and radiation shield every three to six months for dirt and debris. Clean the sensor with a soft brush or compressed air if necessary. Check the connections and replace any damaged cables.

How can I troubleshoot inaccurate readings from my HygroVUE5 Sensor?

First, ensure the sensor and data logger are properly connected. Check for any physical obstructions or dirt on the sensor. Verify that the data logger is configured correctly. If the problem persists, perform a sensor calibration check as outlined in the user manual.

Can the HygroVUE5 Sensor be used in extreme weather conditions?

Yes, the HygroVUE5 Sensor is designed to operate in a wide range of environmental conditions. However, for extreme conditions, ensure it is properly shielded and mounted securely to prevent damage or inaccurate readings.

What data output formats are supported by the HygroVUE5 Sensor?

The HygroVUE5 Sensor supports SDI-12 and Modbus RTU output formats, allowing integration with a variety of data loggers and systems.

How do I perform a calibration check on the HygroVUE5 Sensor?

To perform a calibration check, use a reference device with known accuracy. Compare readings and adjust the sensor’s calibration settings if necessary. Follow the calibration procedure in the user manual for detailed steps.

What should I do if the HygroVUE5 Sensor stops working?

Check the power supply and connections to ensure the sensor is receiving power. Inspect the cable for any signs of damage. If the issue persists, consult the troubleshooting section of the user manual or contact technical support.

How can I integrate the HygroVUE5 Sensor with my existing data collection system?

Ensure your data logger supports SDI-12 or Modbus RTU protocols. Configure the data logger to recognize the sensor and set up the appropriate channels for data recording. Refer to both the sensor and data logger manuals for specific integration instructions.

What are the common causes of data loss from the HygroVUE5 Sensor?

Data loss can occur due to power interruptions, poor connections, or incorrect data logger settings. Ensure there is a reliable power source, secure connections, and that the data logger is correctly configured to capture and store data.

How do environmental conditions affect the performance of the HygroVUE5 Sensor?

Extreme temperatures, humidity, and direct sunlight can affect sensor performance. Use a radiation shield to minimize these effects and maintain accurate readings. Regular maintenance and inspection can also help mitigate environmental impacts.