Central Station Controller for Gas Monitors
controller for gas sensors
  • Monitors up to 96 gas sensors
  • Full array of visual indicators and 65dB alarm
  • Continuous display
  • Zero maintenance - automatic quick self test
  • Low installation cost
  • Programmable time delays
  • Integrated time clock
  • Programmable relays
  • Modbus compatible; with BACnet/IP available

The VA 301C continuously monitors and controls remote sensors for toxic gases, combustible gases, and oxygen hazards. Designed for installation and operational simplicity, the VA 301C reduces the cost of installation and ownership.

Using an addressable RS-485 Modbus communication protocol, the VA 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.

Zoning / Averaging The Vulcain 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 ctivation 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 VA 301C has the capacity to manage input from three Modbus channels for up to 96 transmitters and up to 50 wireless transmitters which can be associated with up to 126 zones. Transmitters can belong to an unlimited number of zones, providing maximum operational and control flexibility.

General Technical Specifications
Capability Modbus controller for centralized gas detection monitoring with real-time gas reading, selective alarm activation and low
cost of installation
Network Capacity Three Modbus channels for up to 96 transmitters, one wireless channel for up to 50 301W wireless transmitters and an
optional BACnet/IP output
Display Large 122 x 32 dot matrix display
Communication Line - distance Up to 609 m (2000 ft.) per channel
Lengths T-Tap: 20 m (65 ft.), maximum per T-Tap
40 m (130 ft.), maximum for all T-Tap combined
Power Requirement

17-27 Vac, 24-38 Vdc, 500 mA

Alarm Levels
3 programmable alarm levels
Outputs 4 DPDT relays (alarms and/or fault); 65dBA buzzer
Relay output rating 5 A, 30 Vdc or 250 Vac (resistive load)
Time Delays 0, 30 sec., 45 sec., 1-99 minutes before and after alarm
Conformity ANSI/UL 61010-1
IEC 61010-1 Including Amendments A1:1992 +
A2:1995 and National Deviations (Canada, US)
Certifications CSA C22.2 No. 61010-1
ETL 11662
Operating Environment Commercial, indoor
Operating temperature range: -20 to 50°C (-4 to 122°F)
Operating humidity range: 15 to 90% RH non-condensing
Dimensions (H x W x D) 28 x 20.3 x 7 cm (11.02 x 7.99 x 2.76 in.)
Enclosure NEMA 4X Polycarbonate – ABS
Weight 1.1 Kg ( 2.4 lb )
Dimensions 8.4 in.(H) x 5.3 in.(W) x 2.25 in.(D) (21.3 cm x 13.4 cm x 5.7 cm)


Price Guidlines
VA301 C
Controller 24 Volts AC power required
VA301C DLC Controller 24 Volts AC, with data logging $1690.00
  Controller 24 Volts AC, with data logging BACnet/IP output $2950.00
Other configurations available depending on your application. Call for help with configuration


This is a world wide web document page design layout and HTML code copyright ©2017 by Topac Inc. - ALL RIGHTS RESERVED