301C Controller

Designed for simple installation and operation, the Honeywell 301C continuously monitors and controls toxic gases, combustible gases and oxygen hazards.

Using an addressable RS-485 Modbus communication protocol, the 301C uses daisy chain wiring requiring only 2 pairs of wires to connect up to 96 transmitters on the 3 input channels. This simplifies installation, in turn lowering costs. The 301C’s zoning and averaging abilities significantly reduce operational and maintenance costs.

The 301C controller offers unique zoning capabilities which permit the averaging and comparison of multiple sensor readings. Zoning can reduce operational costs by ensuring that localized brief fluctuations registered at a single transmitter do not activate relays. For example, a car idling in a parking structure may locally increase a reading at a nearby transmitter. Rather than activating a fan as a result of the temporary localized fluctuation, zoning can be used to limit relay activation until the average reading for a zone exceeds a set-point. This can reduce run time of fans, yielding savings in both energy usage and wear and tear. The 301C has the capacity to manage input from three Modbus channels for up to 96 transmitters and up to 50 wireless transmitters that can be associated with up to 126 zones. Transmitters can belong to an unlimited number of zones, providing maximum operational and control flexibility.
  • User Friendly
    • Zero maintenance
    • User Friendly
    • Automatic quick self-test and warm-up
    • Continuous alphanumeric display
  • Inexpensive and Reliable
    • Low installation costs
    • Allows for up to 126 zoning groups which can save energy and extend fan and relay life
    • Manages up to 768 events with programmable latching alarms
  • Flexible Operation
    • Optional BACnet/IP available
    • Interchangeable transmitters able to detect different gases
    • Expands to handle up to 96 transmitters or relay modules
    • Programmable time delays
    • Integrated time clock enables scheduling of system operations
  • Safety Measures
    • Full array of visual indicators and integrated 65dBA alarm levels
    • Fully programmable relays (can be set as fail-safe or not)
  • Beneficial Options
    • Available in a heavy-duty industrial housing
    • Datalogging option
General Specifications
UseController for centralized gas detection monitoring with real-time gas reading, selective alarm activation and low cost installation
Power Requirement17-27 VAC, 24-38 VDC, 500mA
Size11 (W) x 8 (H) x 2.8 (D) in. (28 x 20.3 x 7 cm)
Weight2.4 lbs. (1.1 kg)
Network CapacityThree RS-485 channels for up to 96 transmitter inputs
Digital CommunicationOptional BACnet/IP interface, BTL listed as a smart sensor
Communication Line LengthsUp to 2,000 ft. (609 m) per channel
T-Tap: 65 ft. (20 m), maximum per T-Tap
130 ft. (40 m), maximum for all T-Tap combined
Relay Output5 A, 30 VDC or 250 VAC (resistive load)
Alarm LevelsFour fully programmable alarm levels
Time Delays0, 30 sec, 45 sec, 1-99 minutes before and after alarm
Outputs4 DPDT relays (alarms and/or fault); 65dBA buzzer
EventsFlexible programming that can include: alarms, gas concentrations, faults, real time clock, voting, optional outlier detection, and time since calibration
DisplayLarge 122 x 32 dot matrix display
Operating Humidity Range0 to 95% RH (non-condensing)
Operating Temperature Range-4° to 122°F (-20° to 50°C)
SecurityPassword protection for tamper resistance
ZoningUp to 126 programmable zones
Optional Memory2GB removable SD Card for configuration, readings, and events
Ratings and Certification
Certified toFor USA: Safety Requirements for Electrical Equipment for Measurement, Control and Laboratory Use - Part 1: General Requirements (ANSI/UL 61010-1, 2nd Edition, Dated July 12, 2004 Including Revisions Through October 28, 2008)
For Canada: Safety Requirements for Electrical Equipment for Measurement, Control and Laboratory Use - Part 1: General Requirements (CAN/CSA C22.2 No. 61010-1:04, 2nd Edition, Dated July 12, 2004 Including General Instruction 1 – October 2008 (Reaffirmed 2009))
Certified byIntertek
Designed to comply withIEC 61010-1:2010 (Third Edition)
California Title 24, Part 6, and associated administrative regulations In Part 1