301-EM Controller Type 1 Canada (for use with R123)



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Delivers sophisticated control functionality for up to twenty remote refrigerant sensors and detects a wide variety of gases. Protects personnel and property when mounted in mechanical or chiller rooms.

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301-EM & S301-IRF Refrigerant, Toxic & Combustible Gas Controller and Networkable Sensors

The 301EM acts as a controller for up to 20 remote sensors and suits a variety of gas detection system solutions for Mechanical Rooms.

Particularly configured to meet ASHRAE 15, B-52 and International Mechanical Code requirements, the 301EM is commonly used to optimize gas detection in mechanical and chiller rooms. A full complement of sensors (including toxic, oxygen, combustible gases and a full line of refrigerant sensors), horns, strobes and remote panels provide added flexibility to suit a variety of gas detection system solutions.

User Friendly

  • Easy to read LCD display
  • Auto-diagnostic capabilities

Economical Solution

  • Cost-effective answer for installation in Mechanical Rooms locations

Flexible Operation

  • Able to operate with up to 20 remote sensors at a time
  • Robust and reliable RS-485 Modbus communication
  • Various types of sensors available to simultaneously detect a range of different Refrigerant, Toxic and Combustible gases

Output Adaptability

  • Three 24 Vdc alarm outputs and four 4-20 mA outputs

Safety Measures

  • Four fully programmable relays
  • Three alarm levels with built-in visual indicators and audible alarm


  • Convenient stand-alone or network operation


  • Mechanical Rooms


Refrigerant Sensors

  • R11
  • R123
  • R125
  • R134a
  • R22
  • R404a
  • R407c
  • R410a
  • R4310
  • R507a

Toxic & Combustible Sensors

  • CO
  • Cl2
  • H2S
  • NO2
  • NH3
  • O2
  • SO2
  • COMB


Intertek: UL 61010-1:2012 Ed.3+R:29 Apr2016 and CSA C22.2#61010-1-12:2012 Ed.3+U1;U2

More Information
PN 301-EM-CA1
Manufacturer Honeywell
Unit of Measure ea
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