Gas Detection Controllers

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HA71 Digital Gas Controller

Simultaneous display and alarm functions for up to 16 input variables, and can expand with 10 additional HA71 units to provide up to 160 points of gas detection.
Features & Benefits
  • Trouble-free operation with menu-driven calibration
  • Three adjustable alarm levels per channel
  • Improved drift and temperature compensation
Quick Specs
  • Display: 128 x 64 pixel graphic LCD with backlight displays
  • Power requirement: 100-240 VAC / 24 VDC
  • Operating temperature: -25°C to +50°C
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Product Overview

A graphic LCD displays monitored data as trends, bar graphs and engineering units. Three adjustable alarm levels are provided per channel. Relay outputs allow control of beacons horns and other alarm events. A horn relay may be set for steady or pulsing operation. Nonvolatile memory retains all configuration data indefinitely.

Analog inputs may be accepted and conditioned via sensor specific analog input cards. Alternatively, the standard Modbus Master port allows input data to be retrieved from Modbus slave devices including the many Modbus compatible Honeywell Analytics sensor transmitter products.

The HA71 is easy to configure and user friendly. Measurement ranges in engineering units, adjustable alarm set-points, dual serial interfaces and many other features combine to allow the HA71 satisfy the needs of many demanding applications. It is widely used for centralizing the display and alarm processing functions in critical multipoint monitoring applications. The optional HA-71-HMI (Human Machine Interface) software provides complete data display and storage, with real-time channel data available in 24-hour or 15-minute trends, including historical alarm and maintenance data.

A RS-485 Modbus slave port allows up to 128 HA71’s to be multidropped onto a single data highway for interrogation by another Modbus master. HA71’s may also be cascaded by connecting one unit’s master port to another’s slave port and others are added by connecting appropriate 8 channel boards (2 required for more than 8 channels) to the economical I2C expansion bus. Familiar “telephone style” cables and connectors interface to this bus. This method allows versatile system configuration of options satisfying the most unusual user applications.

HA71 facilitates monitoring of ambient gas detection, rotating machinery, tank levels, flow, temperature and other controls.  

Additional Features and Benefits:

  • Trouble-free operation--menu driven easy calibration, no moving parts
  • Improved drift and temperature compensation
  • Accepts inputs from up to 16 4-20mA sensors transmitters.
  • CSA certified to C22.2 NO. 152 for combustible detection and Class I, Div. 2, Groups A,B,C,D CE
  • Touch & magnetic keypad for nonintrusive operation in potentially hazardous locations
  • NEMA 4X (Div. 2 certified) and Explosion-Proof wall mount packaging options available
  • 3 independent alarm levels per channel. Relay Acknowledge feature allows silencing of external audible devices during existing alarm conditions
  • Graphic LCD readout displays monitored data as bar graphs, trends and engineering units
  • Cal Mode offers pushbutton zero / span calibration for direct sensor interface applications. Authorization Mode allows locking of critical configuration variables

HA71

FAQ

We do not sell our products directly on our website but we would be happy to assist you with your gas detection needs.  On each product page you will see a red button on the right-hand side titled “HOW TO BUY”.  If you click on this button a form will appear which will go directly to one of our sales representatives once completed and submitted.  

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There are two areas where you can access technical documents.  First, you can visit our Technical Library in the Support section of the website.  Here you will be able to access our entire catalog of documents and videos for all products – current and legacy products.  

You can also access the technical documents for each product on that product’s respective page within the website.    


Yes we do.  Check out our HA University training section to see what programs are available and sign up for any that you are interested in.  These courses are very informative and led by our expert engineers.  If you have any questions about training opportunities for yourself or your staff and would like to talk to a Honeywell representative, click here.

Check out the Product Inquiry page in the Contact Us section.  Here you’ll find sales contacts for each of our product lines and they can help you with any questions you may have from technical specifications to ordering information. 

Check out the Service & Repairs page in the Contact Us section.  Here you’ll find the contact information for our service centers in your region. 

There are several ways you can search for products on our website:

  • Click on the Products link in the main navigation to search by product lines.
  • Find products for a specific Industry or Application by clicking on the links in the main navigation bar at the top of the page.
  • Use our Gas Finder if you’re looking for a product that can detect a specific type of gas.
  • If you still can’t find the product you’re looking for, type the name of the product in the search bar at the top of the page.

Because we do not sell our products directly we cannot quote a specific price on our website.  Contact a sales representative through either the “HOW TO BUY” button on the product page or by calling them and they will be able to obtain pricing from local distributors in your area. 

Simply click on the arrow pointing down next to “LANGUAGE” in the red bar at the very top of the page.  A drop down list will appear and you can select any language from the list.

Our Technical Library has all the documents you’ll need for current and legacy products.  Select the “Legacy Product” filter in the left-hand column to find the documents for your product.  If you still can’t find the information you need, visit the Contact Us section of the website and a service representative will be glad to assist you. 

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