Gas Detection Controllers

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Manning GM-JR

Innovative, standalone readout/alarm unit that can be configured in a variety of ways to solve many refrigeration-gas concentration and alarm needs.
Features and Benefits
  • 20-segment calibrated bar graph
  • Power-up delay
  • Fail-safe design
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Product Overview

This unique, practical gas monitor readout/alarm device offers a variety of configuration options for industrial refrigeration customers with their own computer control system, OEMs who want to incorporate gas sensing in their design and existing Honeywell Analytics customers who want remote indication other than at their main readout. It has an easily adjusted setpoint and relay output in either configuration, plus 4/20mA output in the "feed-through" design. With its own plug-in power supply, the GM-JR sensor combination provides an economical answer for local concentration level information and control capability. 

The GM-JR standard configuration is a single, rugged, miniaturized board mounted inside the door of the enclosure, and a separate terminal board for the sensor and/or power cable connections. The 20-segment LED bar graph has a calibrated scale that is specified when ordered. Alarm trip adjustments are made easily at 5% increments. On power up or after momentary power loss, a one-minute power-up delay period allows the sensor to stabilize. 

The unit continuously monitors the incoming 4/20 mA signal from the sensor. If the signal drops below 1.4 mA, the fault LED will illuminate and the alarm relay will trip. The alarm relay is always energized in its normal state, providing additional safety.

The GM-JR can be housed in its own 4" x 6" heavy-duty steel enclosure and operate as an "end of line" stand-alone readout/alarm unit or feed the sensor's 4/20 mA signal directly through to a PLC. It also can be mounted in the door of any sensor enclosure to incorporate both sensor and readout in the same 4" x 6" or 6" x 8" housing. Use #18/3 shielded cable (Belden #8770 or equal) for runs up to 1500' with most sensors.

Additional Features and Benefits:

  • 20-segment calibrated bar graph 
  • Power-up delay
  • Fail-safe design
  • Easy trip setting
  • Relay output is time delayed
  • Downscale alarm configuration available for oxygen
  • Rugged NEMA 1, gasketed steel enclosure
  • Continuous fault monitoring
  • Feed-through configuration allows remote readout capability while being powered from instrument cable (no remote power supply needed)


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.  

You can also call one of our sales representatives directly.  Click here to go to the Contact Us page.  

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. 

BW Technologies is part of the Honeywell Analytics family so in an effort to provide our customers with complete gas detection solutions we merged the and websites.  We hope that having all of our brands and products in one location will make it easier for you to find the right solution for your gas detection needs. 

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