Section 6

Figure 28 Deadband Concept

pH

7.60

7.40

7.20

 

 

Alarm Off

7.00

 

Deadband

 

 

6.80

 

 

6.60

Alarm On

Low Alarm Setpoint= 6.9 pH

 

 

 

6.40

6.5

Analog Inputs

 

 

 

6.5.1

Analog Inputs Connection

 

Note: 4–20 mA inputs must be

Analog voltage as well as analog current input signals are accommodated in a

isolated. Maximum load per unit is

single connector.

 

200 ohms.

 

 

 

 

 

To connect the analog voltage signal (-4.0 to +4.0 V dc):

 

 

 

1. Tie ground wire to Pin B (ground).

 

 

 

2. Tie analog voltage wire to the appropriate voltage input pin

 

 

(Pin C, E, or G).

 

 

 

For example, to connect an analog voltage input to analog input channel 1, tie

 

 

the ground wire to pin B and your positive wire to pin C.

 

 

 

To connect an analog current signal (4–20 mA dc)

 

 

 

1. Tie ground wire to Pin B (ground).

 

 

 

2. Connect analog current wire to both voltage and current input pins for the

 

 

appropriate channel (Pin C and D, or E and F, or G and H).

 

 

Table 19Analog Input Pin Assignments

 

 

 

 

 

 

 

Pin

Signal Description

 

Wire Color

 

 

 

 

 

 

A

+12 V dc

 

White

 

 

 

 

 

 

B

Signal Ground

 

Blue

 

 

 

 

 

 

C

Voltage Input 1 (-4.0 V dc to +4.0 V dc)

 

Yellow

 

 

 

 

 

 

D

Current Input 1 (4–20 mA dc)

 

Black

 

 

 

 

 

 

E

Voltage Input 2 (-4.0 V dc to +4.0 V dc)

 

Red

 

 

 

 

 

 

F

Current Input 2 (4–20 mA dc)

 

Green

 

 

 

 

 

 

G

Voltage Input 3 (-4.0 V dc to +4.0 V dc)

 

Gray

 

 

 

 

 

 

H

Current Input 3 (4–20 mA dc)

 

Brown

 

 

 

 

 

 

J

not used

 

Violet

 

 

 

 

 

 

K

not use

 

Orange

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Page 93

8990cm.fm

 

 

Analog Inputs

Page 94 Page 96
Page 95
Image 95
Hach 900 MAX manual Analog Inputs Connection, Analog Input Pin Assignments
Page 94 Page 96

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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