Section 6

6.3

4–20 mA Option

 

 

 

 

 

 

The 4–20 mA option provides a current loop for controlling external devices

 

 

 

such as a chart recorder or PC. Either one or both of the 4–20 mA outputs can

 

 

 

be factory installed and are isolated from each other.

 

6.3.1

4–20 mA Connection

 

 

 

 

 

 

The interface has a 3-ft cable with a connector on one end, and a 10-ft cable

 

 

 

with two open wire leads on the other. Insert the connector into the sampler

 

 

 

receptacle labeled “Auxiliary”, located on the left side of the control housing.

 

 

 

On the 10-ft cable, the wire with clear insulation is positive (+) and the wire

 

 

 

with black insulation is negative (-).

 

 

 

 

Table 16 4–20 mA Connections (J18)

 

 

 

 

 

 

 

 

Pin

 

Signal Description

 

Wire Color

 

 

 

 

 

 

 

A

 

Output 1 + (pos)

 

Yellow

 

 

 

 

 

 

 

B

 

Output 1 - (neg)

 

Black

 

 

 

 

 

 

 

C

 

Output 2 + (pos)

 

Red

 

 

 

 

 

 

 

D

 

Output 2 - (neg)

 

Green

 

 

 

 

 

 

Rating:

•Isolation Voltage:

Between sampler and either 4–20 mA output: 2500 V ac

Between the two 4–20 mA outputs: 1500 V ac

•Maximum Resistive Load: 600 ohm

•Output Voltage: 24 V dc - no load

Cable Required

4–20 mA Interface Cable (Cat. No. 2924), 25 ft long, 4-pin connector on one end, tinned wire leads on the other end.

6.3.2 4–20 mA Programming

Note: When the 4–20 mA outputs are disabled and not completely turned off, they will continue to output a steady 4 mA.

1.From the Main Menu, select OPTIONS > ADVANCED OPTIONS > 4–20 mA

OUTPUTS > SELECT.

2.Enable the 4–20 mA outputs by pressing CHANGE CHOICE while in the 4–20 mA output menu.

3.When the display shows the outputs as enabled, press ACCEPT.

4.Choose either OUTPUT A or OUTPUT B. Use the UP and DOWN keys to highlight the choice, then press SELECT.

11:00 AM 21 - APR - 01

4–20 mA OUTPUTS

 

 

SELECT

OUTPUT A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OUTPUT B

 

 

 

 

 

 

 

 

 

 

RETURN

 

Page 87

8990cm.fm

4–20 mA Option

Page 88 Page 90
Page 89
Image 89
Hach 900 MAX manual Section MA Option, MA Connection, 2 4-20 mA Programming, mA Connections J18, Rating
Page 88 Page 90

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.
Top Page Image Contents