Section 4

7.Set the Velocity Units (fps or m/s), using the UP and DOWN arrow keys. Press ACCEPT to continue.

8.Highlight Velocity Cutoff, using the UP and DOWN keys. Press SELECT.

9.Read the Velocity Cutoff information screen. Press any key to continue.

10.Set the Velocity Cutoff using the numeric keypad. Press ACCEPT.

11.Set the Velocity Default, using the numeric keypad. Press ACCEPT. Press RETURN to go back to the Setup Menu or Main Menu to return to the Main Menu display.

4.2.3 Submerged Area/Velocity Submerged Area/Velocity Sensor Calibration

This calibration requires a graduated cylinder or bucket with at least

16 cm (6 in.) of water and a ruler. Calibrating the Submerged Area/Velocity Sensor characterizes the sampler electronics to the unique characteristics of each individual sensor. In addition, the calibration compensates for any sensor drift that may occur over time (6 months or greater) as the materials in the sensor age.

The Submerged Area/Velocity Sensor is a pressure transducer that contains a stainless steel diaphragm. As the water pressure increases, (with increasing level in the flow stream) the diaphragm is deflected, or pushed, against a solid state device called a strain gauge. The strain gauge converts the pressure against the diaphragm to a voltage. As the level in the flow stream increases, so does the voltage coming from the Submerged Area/Velocity Sensor. The voltage is read by the microprocessor in the sampler at regular intervals and converted to a number that represents the level in the flow stream.

The manufacturer recommends calibrating the submerged area/velocity sensor when:

•The sensor is first used.

•Installing a new or different sensor on a flow meter or input receptacle.

•The difference between the level reading of the flow meter and the independent verification (measurement with a dipstick or ruler)

is increasing.

Note: The data is constant if the difference between the level reading of the flow meter and the independent verification is constant; recalibration is not required.

Note: Errors can occur with the flow meter level reading and the independent verification. Errors are caused by variation in site conditions and measurement abilities. These errors may cause slight changes in the difference, therefore, not indicating a true change in the difference.

1.From the Main Menu, select OPTIONS > ADVANCED OPTIONS >

CALIBRATION > SUBMERGED PROBE.

2.Place the sensor flat on a table top or floor with the sensor (the plate with holes) facing down onto the surface (Figure 17). Press any key to continue.

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Submerged Area/Velocity Sensor

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Hach 900 MAX manual From the Main Menu, select Options Advanced Options
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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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