Toxic/Combustible Gas Monitor- Nework Version
  • Advanced Sensing Technology:
  • Detects CO, NO2, O2, H2, H2S, CH4, C3H8
  • Wall or duct Mount
  • Advanced electrochemical (for toxic gases)and catalytic bead (for combustible gases) sensor performance
  • Comes in standalone (shown here), or network versions (this page)
  • Connects to analog or digital systems
  • Works with virtually any BAS including BACnet, Modbus or LonWorks
  • Connects to wired or wireless system (via 301CW wireless controller)
  • Cost Effective:
  • Saves energy through Demand Control Ventilation (DCV)
  • Optimizes BAS, fire, ventilation and other security systems
  • Versatile Communications:
  • Works through BAS to improve fault diagnostics and collect data on gas concentration levels, sensor condition, etc.
  • Couple with VA301C to log data and daisy-chain up to 96 E3Point units

The E3Point detects a wide range of toxic and combustible gases found in commercial building spaces and outdoor buildings, including CO, NO2, O2, H2, H2S, CH4 and C3H8. This page covers the specifications of the networkable device (interoperable with BACnet, Lonworks or other Building Automation System); E3Point also functions with existing controller-based gas monitoring systems and wired or wireless gas monitoring system components.

E3Point uses Demand Control Ventilation through relays, Building Automation System (BAS) or controller in order to increase energy savings, extend fan life, and align with practices of green building. In its network configuration, E3Point also optimizes HVAC, fire/smoke, surveillance, and other building systems performance.

Intelligent product design reduces the unit’s cost of ownership while increasing flexibility of application. Smart sensors are pre-calibrated, auto-configured upon set-up and operate continuously on patented Reflex© technology which continuously monitors sensor cell condition and alerts user to fault status. The plug-n-play sensor cartridge, user-friendly menu and wiring options simplify installation and maintenance, and reduce the cost of gas monitoring over the life of the unit.

Portable Air Quality Monitor, CO, CO2 here 

Locating the Sensor:duct mount sensor
Since the E3 Point units are shipped with custom network diagrams that indicate the best locations for installation, the remaining considerations are installation height and detection objectives. IF the primary application is the fastest possible leak detection, mount the sensor near the ptential leak sources. As a result, the indicated concentration may not be representative of personnel exposure, and easy access for the required calibration and maintenance can be compromised.

Duct Mounting
With the duct mounting kit included with duct mount versions the unit is mounted directly in a housing which is attached to the duct. Sample tubes extend into the duct and draw a sample into the sensor area.

Air Currents:
If there are fans, wind , or other sources of air movement, gases may tend to rise or collect in certain areas of a facility. The local air currents should be assessed to aid in selecting the sensor location. Air convection can often be more important in determining gas concentration areas than factors of vapor density.

Gas Emission Sources:
As a rule, at least one sensor shouold be located in close proximity to each point where an emission is likely to occur.

Detected Gas Relative Density Installation Height
(air =1)
Carbon Monoxide
1-1.5 m (3-5 ft.) from floor
Hydrogen Sulfide
30 cm (1ft.) from floor
Nitrogen Dioxide*
1.58 (cold)
30 cm -1 m (1-3 ft.) from floor
1-1.5 m (3-5 ft.) from floor
COMB Most combustibles are heavier than air, with the exception of methane, hydrogen, ethylene and acetylene. Sensors for gases that are heavier than air should be installed approximately 30 cm (1ft.) from the floor. For combustibles that are lighter than air, sensors should be installed 30 cm (1ft.) from the ceiling, close to the potential leak source.
* May differ in certain applications. Hot NO2 from exhaust systems is lighter than ambient air.
General Technical Specifications
Sensor options ( 1 sensor per unit) CO (Carbon Monoxide), H2S (Hydrogen Sulfide), NO2 (Nitrogen Dioxide), O2 (Oxygen), H2 (Hydrogen), CH4 (Methane), C3H8 (propane)
Input Power:

24 VAC nominal, 17-27- VA,. 50/60 Hz, 0.35 A
24 VDC nominal, 20-38 VDC

Network Communications RS485 modbus; BACnet MS-TP master
Relay output: 1 DPDT relays, 5A @ 250 VAC, 5A@ 30VDC
Operating Environment Commercial, indoor
Operating temperature range: H2S, N02, O2, Comb.: -40 to 50*C (-40 to 122* F)
CO: -20 to 50*C (-4* F to 122*F)
Available option CO: -40 to 50*C (-40 to 122*F)
Operating humidity range: 15 to 90% RH non-condensing
Resolution: CO= 1 ppm
O2 = 0.1% vol.
H2S= 0.1 ppm
NO2 = 0.1 ppm ,br> CH4, H2, C3H8, = 0.5% LEL
Operating Altitude: Mazimum 2000m (6562 tf)
Audible Alarm: > 85 dB at 3 m (10 ft)
Display: 8 character, 2 line LCD
Visual Indicators: Green LED: Power
Amber LED 1: Alarm/Fault
Amber LED 2: Alarm/Fault
Enclosure : Polycarbonate
Dimensions (H x W x D) 20.56 x 14.90 x 6.72 cm (8.09 x 5.87 x 2.65 in.)
Certifications CSA C22.2 No. 61010-1
FCC part 15; ICES-003 issue 4;ISO9001-2008
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)


E3 Point Detection Specifications:

Sensor Type Gas Range Detection Unit Accuracy (@25*) Display Resolution
CO  0/250 ppm 3% 1 ppm
Electrochemical O2 0/25 % 3% 0.1%
Electrochemical H2S 0/50 ppm 3%  0.1 ppm
Electrochemical  NO2  0/10 ppm 3% 0.1 ppm
Catalytic combustion (CH4) 0/100 (5.0% v/v) %LEL 3% 0.5%
Catalytic Combustion (H2) 0/100 (4.0% v/v) %LEL 3%  0.5%
Catalytic combustion (C3H8) 0/100 (2.1% v/v) %LEL 3% 0.5%


Ordering Information network units
order on line
  24 Volt Wall Mount Units  
E3SM-SCO E3 pt. Wall Mount 4-20mA 24VAC/DC CO> $522
E3 pt. Wall Mount 4-20mA 24VAC/DC NO2
E3 pt. Wall Mount 4-20mA 24VAC/DC H2S
E3 pt. Wall Mount 4-20mA 24VAC/DC H2
E3 pt. Wall Mount 4-20mA 24VAC/DC O2
E3SM-M (methane)
E3 pt. Wall Mount 4-20mA 24VAC/DC CH4
E3SM-P (propane)
E3 pt. Wall Mount 4-20mA 24VAC/DC C3H8
  24 Volt Duct Mount Units  
E3DM-SCO E3 pt. Duct Mount 4-20mA 24VAC/DC CO $682
E3 pt. Duct Mount 4-20mA 24VAC/DC NO2
E3 pt. Duct Mount 4-20mA 24VAC/DC H2S
E3 pt. Duct Mount 4-20mA 24VAC/DC H2
E3 pt. Duct Mount 4-20mA 24VAC/DC O2
E3DM-M (methane)
E3 pt. Duct Mount 4-20mA 24VAC/DC CH4
E3DM-P (propane)
E3 pt. Duct Mount 4-20mA 24VAC/DC C3H8


   Topac Inc 231 CJC Highway, Cohasset MA 02025 USA
Tel: 781 740 8778 Fax: 781 740 8779 e-mail:

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