Campbell Scientific OBS-3 Instruction Manual

Campbell Scientific OBS-3 Sensor manual cover

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Campbell Scientific OBS-3 Sensor Specification

The Campbell Scientific OBS-3 Sensor is an advanced turbidity and suspended solids monitoring instrument designed for environmental and industrial applications. It employs optical backscatter technology to measure the concentration of suspended particles in water, providing accurate turbidity readings in nephelometric turbidity units (NTU) or Formazin Nephelometric Units (FNU). The sensor is constructed with a rugged, corrosion-resistant housing, ensuring durability in harsh environments. It features a compact design, suitable for both shallow and deep water deployments, with a depth rating of up to 300 meters.

The OBS-3 is equipped with a high-output infrared LED light source and a photodetector positioned at an optimal angle to detect backscattered light from particulates. This configuration allows it to effectively measure turbidity levels ranging from 0 to 4,000 NTU, accommodating a wide array of water qualities. The sensor includes an integrated temperature sensor, which provides temperature-compensated readings, enhancing measurement accuracy across varying environmental conditions.

Connectivity options for the OBS-3 include SDI-12 and RS-232 interfaces, facilitating seamless integration with Campbell Scientific data loggers and other compatible systems. The sensor operates with low power consumption, making it ideal for remote or solar-powered installations. Calibration is straightforward, typically conducted using standard calibration solutions, ensuring reliable and repeatable measurements.

The OBS-3 is suitable for various applications, including monitoring of rivers, streams, lakes, and coastal waters, as well as wastewater treatment and industrial effluent monitoring. Its robust performance in diverse conditions makes it a preferred choice for researchers and professionals seeking dependable and precise turbidity measurements. Overall, the Campbell Scientific OBS-3 Sensor stands out for its precision, versatility, and durability in challenging monitoring scenarios.

Campbell Scientific OBS-3 Sensor F.A.Q.

What is the proper way to install the OBS-3 sensor in the field?

The OBS-3 sensor should be mounted securely at the desired depth, ensuring that it is aligned with the water flow. It is important to avoid areas with excessive turbulence or debris to prevent damage or inaccurate readings.

How do I calibrate the OBS-3 sensor?

Calibration involves using a known turbidity standard to adjust the sensor's output to match expected values. Follow the manufacturer's guidelines for creating calibration curves and ensure that the sensor is clean before calibration.

What maintenance does the OBS-3 sensor require?

Regular maintenance includes cleaning the sensor with fresh water to remove any biofouling or sediment buildup. Additionally, check the cables and connectors for signs of wear or damage.

How can I troubleshoot if the OBS-3 sensor is not providing data?

Check the power supply and connections first. Ensure that the data logger is configured correctly. If the problem persists, inspect the sensor for any physical damage and refer to the manual for specific troubleshooting steps.

What are the common error codes for the OBS-3 sensor and their meanings?

Refer to the sensor's manual for a comprehensive list of error codes. Common errors might include those related to power issues, sensor calibration errors, and communication failures.

Can the OBS-3 sensor be used in saltwater environments?

Yes, the OBS-3 sensor is designed to be used in both freshwater and saltwater environments. However, regular maintenance is crucial to prevent corrosion and biofouling in saltwater applications.

How do I replace the wiper on the OBS-3 sensor?

To replace the wiper, carefully follow the instructions in the sensor's manual. Ensure that you have the correct replacement parts and tools, and test the wiper function after installation.

What data output formats are supported by the OBS-3 sensor?

The OBS-3 sensor typically supports analog and digital outputs, including options like SDI-12 and RS-232. Confirm the specific output format with the sensor's specifications and your data logger compatibility.

How can I extend the cable length of the OBS-3 sensor?

Use appropriate extension cables and connectors specified by the manufacturer to ensure reliable data transmission. Avoid extending cables beyond recommended lengths to prevent signal degradation.

What should I do if the sensor readings are inconsistent?

Check for fouling or debris on the sensor optics. Ensure that the sensor is properly calibrated and that environmental conditions are stable. If issues persist, refer to the troubleshooting section of the manual.