Easily configured to meet ASHRAE 15, B-52 and International Mechanical Code requirements, the Honeywell 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.
  • ASHRAE No 15-2001 Mechanical Standard and B-52 Code Compliance The ASHRAE and B-52 security standards have been established to minimise risk and protect the safety of mechanical room personnel and the environment at large. Available in a special configuration, the 301EM mechanical room controller has been carefully designed to meet and even exceed these rigorous standards. The Vulcain 301EM can be configured to offer automatic fan, horn and strobe activation in addition to manual fan activation. Latching relay for manual alarm recognition, silence key for manual horn deactivation, built-in 24 Vdc outputs for horn operation, and 2 breakglass switch accessories for manual alarm activation ensure optimal performance.
User Friendly
  • Easy to read LCD display
  • Auto-diagnostic capabilities
Economical Solution
  • Cost-effective answer for installation in hazardous locations
Flexible Operation
  • Able to operate with up to twenty remote sensors at a time
  • Various sensors available to simultaneously detect a range of different gases
  • Robust and reliable RS-485 Modbus communication
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
Beneficial Options
  • Convenient stand-alone or network operation
  • Mechanical Rooms
  • Chiller Rooms
UseWall mounted mechanical room controller for use with Honeywell Analytics 301IRFS and S301D2 gas sensors for up to 20 points of detection. Four (4) onboard relays can be used to activate alarms or deactivate equipment.
Power Requirement22-27 VAC, 29-38 VDC, 2A max @ 29VDC
Size11 (H) x 8 (W) x 2.7 (D) in. (28 x 20.3 x 7 cm)
Weight2.25 lbs. (1.02 kg)
Distance Between Controller and Sensor301IRFS refrigerant sensorsUp to 200 ft. (60.9 m)
S301D2 toxic/combustible sensorsUp to 500 ft. (160 m)
Visual IndicatorsNormal OperationGreen LED
Alarm Level 1Red LED
Alarm Level 2Red LED
Alarm Level 3Red LED
Signal TxBlinking amber LED
Failure IndicationYellow LED
Alarm Levels3 with high and low setpoints
Outputs4 DPDT relays (alarms and/or fault), buzzer
Three 24 VDC, 250mA (per output)
Four 4-20mA outputs
RFS option24 VDC built-in red strobe
RFSA option24 VDC built-in red strobe & 105 dBA horn
Relay Output Rating5 A, 30 Vdc or 250 VAC (resistive load)
Ratings and CertificationAlarm LevelsCAN/CSA C22.2 No. 61010-1
Conforms toANSI/UL 61010-1
Gases DetectedDetection RangeOperating TemperatureOperating Humidity Range
S301-IRFR11, R22, R123, R125, R134A, R404A, R407C, R410A, R507A0-1,000 ppm32° to 104°F (0° to 40 °C)0-95% non-condensing
S301-D2Carbon Monoxide (CO)0-250 ppm-40° to 100°F (-40° to 40°C)0-95% non-condensing
Chlorine (Cl2)0-15 ppm-40° to 100°F (-40° to 40°C)0-95% non-condensing
Nitrogen Dioxide (NO2)0-10 ppm-40° to 100°F (-40° to 40°C)0-95% non-condensing
Hydrogen Sulfide (H2S)0-50 ppm-40° to 100°F (-40° to 40°C)0-95% non-condensing
Sulfur Dioxide (SO2)0-10 ppm-40° to 100°F (-40° to 40°C)0-95% non-condensing
Oxygen (O2)0-25%-4° to 104°F (-20° to 40°C)0-95% non-condensing
Combustibles0-100% LEL-40° to 112°F (-40° to 50°C)0-95% non-condensing