Section 1

1.4 Principle of Operation

1.4.1 Liquid Sensing

The sampler is designed for indoor, permanent installation. All controls are located on the front panel. Capped, watertight connectors for interfacing to external devices are located along the left side of the controller.

The sampler uses a liquid sensing system to detect the absence or presence of liquid at the peristaltic pump intake. The liquid sensor (Figure 3) is located on the front of the control housing.

The liquid sensing system provides three primary benefits:

•Accurate, repeatable sample volumes

•Intake tube prerinse

•Sample retry

Figure 3

Liquid Sensor

1

2

3

1.Sensor Body

2.Sensor Cover

3.Knobs (turn to remove)

Accurate, Repeatable Sample Volumes

The liquid sensor detects the presence and velocity of the incoming sample. This information allows the sampler to automatically dispense the correct amount of liquid into the sample bottle.

The liquid sensing system allows the sampler to deliver repeatable sample volumes even with changing suction lifts. Each time the peristaltic pump pulls a sample, the microprocessor determines the time required for liquid to travel to the liquid sensor. If the suction lift increases due to a drop in level at the sample source, the time required for liquid to reach the sensor will increase. The microprocessor automatically compensates for this change by allowing the peristaltic pump to deliver sample liquid for a corresponding longer period of time. Conversely, if suction lift decreases due to an increase in level at the sample source, the time required for liquid to the sensor will decrease. Again, the microprocessor automatically compensates for this change by decreasing the sample delivery time.

 

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Principle of Operation

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Hach 900 MAX manual Section Principle of Operation, Liquid Sensing, Liquid Sensor, Accurate, Repeatable Sample Volumes
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900 MAX specifications

The Hach 900 MAX is an advanced analytical instrument designed to perform water quality analysis with precision and efficiency. This multiparameter water quality analyzer is tailored for a wide range of applications, including environmental monitoring, wastewater treatment, and industrial processes. Its unique design and technology make it a valuable tool for professionals in the field.

One of the standout features of the Hach 900 MAX is its ability to measure multiple parameters simultaneously. Equipped with advanced sensors, the device can analyze key water quality indicators such as pH, turbidity, dissolved oxygen, conductivity, and various chemical parameters. This comprehensive measurement capability allows users to gain a complete understanding of water quality in a single run, saving both time and resources.

The Hach 900 MAX utilizes cutting-edge technologies to provide accurate and reliable results. Its integrated optical sensors employ advanced photometry, which enhances the detection of chemicals in water samples with high sensitivity. Additionally, the device includes advanced calibration management tools that ensure consistent accuracy over time. Users can easily perform routine calibrations with minimal effort, facilitating reliable data collection.

Another notable characteristic of the Hach 900 MAX is its user-friendly interface. The instrument features a large, touchscreen display that allows for intuitive navigation through various settings and parameters. Users can quickly access real-time data, generate reports, and analyze trends using the built-in software. The ability to customize dashboards and create visual representations of data enhances user experience and simplifies the decision-making process.

In addition to its analytical capabilities, the Hach 900 MAX emphasizes connectivity and data management. The instrument can be connected to laboratory information management systems (LIMS) and other data networks, enabling smooth data transfer and integration into existing workflows. This connectivity enhances collaboration among team members and facilitates compliance with regulatory requirements.

Durability is another hallmark of the Hach 900 MAX. The device is designed for use in demanding environments, with robust construction and protection against dust and moisture. This reliability ensures that the analyzer remains operational even in challenging conditions, making it suitable for field applications.

Overall, the Hach 900 MAX stands out as a powerful and versatile tool in the realm of water quality analysis. With its multiparameter measurement capabilities, advanced sensor technologies, user-friendly interface, and reliable performance, it enables professionals to obtain accurate insights into water quality efficiently. As environmental concerns continue to grow, instruments like the Hach 900 MAX play a crucial role in ensuring the safety and sustainability of water resources.
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