Contents

Revision and Copyright Information
Warranty and Assistance
Table of Contents
Cautionary Notes
SR50 Sonic Ranging Sensor
- 1. SR50 Specifications
- 2. Introduction
- 3. Operation
  - 3.1 SDI-12 Operation
    - 3.1.1 SDI-12 Wiring
  - 3.2 SDI-12 CR10(X) Program Example
    - CR10X and SDI-12 FUNCTION DATA OUTPUTCR23X P105 COMMANDSPa
  - 3.3 Pulse Train Output
    - 3.3.1 Pulse Training Wiring
  - 3.4 Two 21X Program Examples for Pulse Train Output
    - 3.4.1 Pulse Train Programming Example 1
    - 3.4.2 Pulse Train Programming Example 2
  - 3.5 ASCII Output
- 4. Sensor Mounting and Installation
- 5. Data Interpretation
  - 5.1 Measuring Snow Depth
- 6. Maintenance
- 7. Assembly/Disassembly Procedures
Appendix A. Making Concurrent Measurements with the SR50
Campbell Scientific Contact Information

Campbell Scientific SR50 Instruction Manual

Campbell Scientific SR50 Sensor manual cover

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Campbell Scientific SR50 Sensor Specification

The Campbell Scientific SR50 Sensor is an advanced ultrasonic distance measurement device designed for accurate and reliable snow depth monitoring and other distance measurement applications. It operates using ultrasonic pulses to determine the distance to a target surface, making it particularly effective in environments where traditional contact-based measurement methods are impractical. The SR50 features a measurement range from 0.5 to 10 meters, with a resolution of 1 millimeter and an accuracy of ±1 centimeter under typical conditions. This sensor is engineered to perform optimally in a wide temperature range from -45°C to +50°C, making it suitable for harsh and variable climates.

The SR50 utilizes a robust design to withstand environmental stresses, including an IP65-rated housing that ensures protection against dust and water. Its low power consumption, typically around 250 milliwatts during measurement, makes it ideal for remote installations where power availability is limited. Communication with data loggers or other systems is facilitated through SDI-12, RS-232, or RS-485 interfaces, providing flexible integration options for diverse data acquisition systems.

The sensor's innovative transducer design minimizes error by compensating for changes in air temperature, enhancing measurement accuracy. In addition to snow depth monitoring, the SR50 can be employed in applications such as water level measurement, crop canopy analysis, and other scenarios requiring non-contact distance assessment. Its easy installation and maintenance, combined with its proven reliability, make the Campbell Scientific SR50 a trusted choice for researchers and professionals in environmental monitoring and related fields.

Campbell Scientific SR50 Sensor F.A.Q.

How do I connect the Campbell Scientific SR50 sensor to a data logger?

To connect the SR50 sensor to a data logger, use the sensor's cable to connect the appropriate wires to the data logger's input terminals. Refer to the sensor and data logger manuals for specific wiring diagrams and configurations.

What is the recommended maintenance schedule for the SR50 sensor?

The SR50 sensor should be inspected every 6 to 12 months. Check for any physical damage, clean the sensor face with a soft cloth if necessary, and verify that the sensor is securely mounted.

How can I troubleshoot incorrect readings from the SR50 sensor?

If the SR50 sensor provides incorrect readings, check the wiring connections, ensure that the sensor is properly aligned, and verify that there are no obstructions blocking the sensor's path. Additionally, check for any software configuration errors in the data logger.

What environmental conditions can affect the SR50 sensor's accuracy?

Environmental factors such as temperature extremes, high humidity, and strong winds can affect the SR50 sensor's accuracy. It is important to install the sensor in a location that minimizes these effects or apply appropriate corrections in the data analysis.

How do I calibrate the SR50 sensor?

The SR50 sensor is factory calibrated and typically does not require field calibration. However, if calibration is necessary, use a known reference distance and adjust the sensor settings accordingly. Consult the sensor manual for detailed calibration procedures.

What data output formats are supported by the SR50 sensor?

The SR50 sensor supports various data output formats, including SDI-12, RS-232, and RS-485. Select the format that is compatible with your data logging system and configure the sensor accordingly.

Can the SR50 sensor be used in snowy conditions?

Yes, the SR50 sensor is designed to operate in snowy conditions. It uses an ultrasonic pulse to measure distance to the snow surface, making it effective for snow depth measurements. Ensure the sensor face is kept clear of ice buildup for optimal performance.

How do I update the firmware on the SR50 sensor?

To update the firmware on the SR50 sensor, connect the sensor to a computer using the appropriate interface and follow the manufacturer's instructions for downloading and installing the firmware update. Ensure that the sensor remains powered throughout the process.

What is the typical range of the SR50 sensor?

The SR50 sensor typically has a measurement range of 0.5 to 10 meters. This range allows it to be used effectively for a variety of applications, including snow and water level measurements.

How can I integrate the SR50 sensor with a Campbell Scientific CR1000 data logger?

To integrate the SR50 sensor with a CR1000 data logger, configure the data logger to read the sensor's output based on the chosen communication protocol. Use LoggerNet or similar software to set up the data logger's program for data acquisition.