Contents

Revision and copyright information
Table of contents
1. Introduction
2. Precautions
3. Initial inspection
4. QuickStart
5. Overview
6. Specifications
7. Installation
- 7.1 Installation considerations
  - 7.1.1 Vent and desiccant tubes
  - 7.1.2 Appropriate water depth
  - 7.1.3 Dislodge bubbles
- 7.2 Installing and securing the transducer
  - 7.2.1 Split mesh cable grip
  - 7.2.2 Heyco cable grip
- 7.3 Wiring
  - 7.3.1 SDI-12 data logger connections
  - 7.3.2 RS-232 connections
- 7.4 Programming
  - 7.4.1 SDI-12 programming
  - 7.4.2 Offset calculation
- 7.5 Changing nose cones
8. Operation
- 8.1 Configuration
  - 8.1.1 Computer connection using the A200
    - 8.1.1.1 Driver installation
    - 8.1.1.2 A200 wiring
    - 8.1.1.3 Powering the sensor
    - 8.1.1.4 Determining which COM port the A200 has been assigned
  - 8.1.2 Device Configuration Utility (version 2.03 or higher)
- 8.2 SDI-12 commands
- 8.3 Measuring multiple SDI-12 sensors
- 8.4 Unit command
- 8.5 Sample number command
9. Maintenance
- 9.1 Every visit
- 9.2 Every two years
10. Troubleshooting
Appendix A. Importing Short Cut code into CRBasic Editor
Appendix B. Example program
Appendix C. Calibration certificate
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 Extended commands
- D.2 SDI-12 transparent mode
  - D.2.1 Changing an SDI-12 address
- D.3 References
Appendix E. RS-232 connection via computer terminal software
Limited warranty
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Campbell Scientific CS451 Product Manual

Campbell Scientific CS451 Sensor manual cover

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Campbell Scientific CS451 Sensor Specification

The Campbell Scientific CS451 Sensor is a high-precision pressure transducer designed for measuring water level and water pressure in various environmental and industrial applications. It offers accurate and reliable data, making it ideal for hydrological studies, groundwater monitoring, and other fluid measurement tasks. The sensor is constructed with a rugged stainless steel housing, ensuring durability and resistance to harsh environments and corrosive elements. Equipped with a piezoresistive sensor, the CS451 provides precise measurements with an output accuracy of ±0.1% full scale and a resolution of 0.0035% full scale.

The CS451 operates within a pressure range of 0 to 7, 35, or 70 meters of water column, accommodating different field requirements. It supports a wide temperature range from -20°C to 80°C, maintaining performance in varied climatic conditions. The sensor's design includes a vented cable, which compensates for atmospheric pressure changes, enhancing measurement accuracy. The CS451 features an RS-232 or SDI-12 output, allowing seamless integration with data loggers and telemetry systems for automated data collection and remote monitoring.

The sensor's low power consumption is optimized for long-term deployments in remote locations, powered by external batteries or solar panels. Its compact size facilitates easy installation and maintenance, while the robust design minimizes the need for frequent servicing. The CS451's versatility extends to its compatibility with various Campbell Scientific data loggers, creating a comprehensive solution for data acquisition and management. Overall, the Campbell Scientific CS451 Sensor stands out as a reliable and efficient tool for precise water level and pressure monitoring across diverse applications.

Campbell Scientific CS451 Sensor F.A.Q.

How do I install the CS451 sensor in a well?

To install the CS451 sensor in a well, first ensure the well is clean and free of debris. Lower the sensor into the well using a suspension cable, ensuring it does not touch the walls to prevent damage. Secure the cable at the top of the well to prevent movement.

What is the typical maintenance procedure for the CS451 sensor?

Regularly inspect the sensor for physical damage and clean the sensor body with a soft brush to remove any biofouling. Check and tighten any connections, and verify that the sensor is providing accurate readings by comparing against a known reference.

How can I troubleshoot inaccurate readings from my CS451 sensor?

First, verify the sensor is properly calibrated. Check all connections for corrosion or loose contacts. Ensure the sensor is not obstructed or damaged. If issues persist, perform a factory reset and recalibrate the sensor.

Can the CS451 sensor be used in saltwater environments?

Yes, the CS451 sensor can be used in saltwater environments. It is constructed with corrosion-resistant materials suitable for such conditions. Regular cleaning is recommended to prevent biofouling.

What data logger compatibility should I consider for the CS451 sensor?

The CS451 is compatible with most Campbell Scientific data loggers. Check that the data logger supports SDI-12 or RS-232 interfaces, which are used by the CS451.

How can I extend the cable of my CS451 sensor?

To extend the cable, use a waterproof junction box and ensure all connections are sealed to prevent water ingress. Use cables with similar specifications to avoid signal degradation.

What should I do if the CS451 sensor is not communicating with the data logger?

Check the power supply to ensure the sensor is receiving voltage. Verify that the communication settings match between the sensor and the data logger. Inspect the cables for any damage.

How do I calibrate the CS451 sensor?

Calibration involves comparing the sensor's readings with a known reference, adjusting the sensor’s settings as necessary. Follow the calibration procedure outlined in the user manual specific to your application.

What environmental conditions can affect the CS451 sensor's performance?

Extreme temperatures, high salinity, and biofouling can affect performance. Ensure the sensor is rated for the environmental conditions of your application and consider protective measures if necessary.

How do I perform a factory reset on the CS451 sensor?

To reset the CS451 sensor to factory settings, use the interface specified in the user manual (typically a software utility provided by Campbell Scientific) and follow the reset instructions.