Appendix B

Note: The Review All Items selection from the Setup menu indicates the maximum available logging hours for the channels and recording intervals you selected. The sampler calculates this information when the program is run using the RUN/STOP key.

Power Save Mode.

Selecting a five minute logging interval in Extended Power Mode causes a reading to be taken and logged every five minutes. All channels must share the same logging interval.

Longer logging intervals result in a longer total recording time. Lower resolution also occurs since more averaging is done at higher logging intervals. Choose the shortest logging interval possible, while still making data collection convenient. If possible, visit the site once per month to collect data, and choose a logging interval that almost fills memory over the course of one month.

For example, if the sampler is equipped with the standard complement of RAM memory (128K) and only one channel is logged, a two-minute logging interval would take 24 days to completely fill the available memory

If, on the other hand, a one-minute logging interval is selected, the memory would become full after 12 days.

Table 25 Logging Intervals vs. Total Recording Time for Each Memory Configuration*

 

Total Recording Time (days) before

Total Recording Time (days) before

Logging Interval

memory is full, with 128K Bytes of

memory is full with 512K Bytes of

 

RAM (standard)

RAM (optional)

 

 

 

 

(approx. 18,482 readings)

(approx. 115,630 readings)

 

 

 

 

1

12.15

80.55

 

 

 

 

2

24.30

161.10

 

 

 

 

3

36.45

241.65

 

 

 

 

5

60.75

402.75

 

 

 

 

6

72.90

483.30

 

 

 

 

10

121.50

805.50

 

 

 

 

12

145.80

966.60

 

 

 

 

15

182.25

1208.25

 

 

 

 

20

243.00

1611.00

 

 

 

 

30

364.50

2416.50

 

 

 

 

60

729.00

4833.00

 

 

 

 

 

 

 

 

* Assuming one logged channel.

Dynamic Memory Allocation

The sampler uses a management scheme called “Dynamic Memory Allocation.” All readings are logged in battery-backed Random Access Memory (RAM). RAM memory is allocated to each channel dynamically during operation. If one channel is logging at five-minute intervals and a second channel logging at one-minute intervals, the sampler automatically configures memory so that both channels fill memory at the same time. Five times as much memory is assigned to the channel that is logging at one- minute intervals than the channel that is logging at five-minute intervals.

Memory can be configured in two ways:

• Slate Modem

• Wrap Mode

 

 

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Programming Features

8990apdx_pfeatures.fm

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Hach 900 MAX manual Dynamic Memory Allocation, Slate Modem Wrap Mode
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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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