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A14/A11 Economy Gas Detection System

GasSens A14/A11 Gas detection system is a flexible component system providing a variety of options to meet individual gas detection and alarm requirements. Economical and low maintenance, this system is your best choice for reliable leak detection.

For pricing of GasSens A14/A11 gas detection system, please call AFC International at 1-800-952-3293, 219-987-6825 or fax 219-987-6826 or email



GasSens A14/A11 gas detection system is a flexible component system providing a variety of options to meet individual gas detection and alarm requirements. Economical and low maintenance, this system is your best choice for reliable leak detection. GasSens detection systems consist of individual modules that can be located where required. Sensor/transmitters located in the area where gas leakage or buildup might occur, provide the basic measurement for the system. Sensor transmitters are available in either NEMA 4X or explosion-proof versions and can be supplied with ATI’s exclusive Auto-Test automatic sensor testing system.

Receiver modules provide the electronic brains for the detection and alarm system. Each compact module includes a digital display of gas concentration, isolated analog output, and 4 relay outputs. Receivers may be located up to 1,000 feet from sensor/transmitters for remote indication or can provide local control functions such as valve shut off while transmitting a 4-20 mA signal to remote displays or dataloggers.

Receiver modules provide an interface between the detection system and external alarming and data logging requirements. One module is used with each sensor/transmitter.

The GasSens A14/A11 vas detection system employs electrochemical sensors developed and manufactured by ATI. Expertise in electrochemistry and sensor design provide the foundation for leak detection systems that perform continuously with minimal maintenance. Sensors are rated for ambient temperature from -25 to 50ºC, allowing both indoor and outdoor applications. Excellent zero stability and high sensitivity and selectivity combine to make ATI sensors the best available.

Gas sensors are closely coupled to a digital transmitter for excellent noise immunity and the ability to transmit long distances using unshielded cable. The transmitter is powered from the receiver module and uses a unique current pulse position technique to send information to the receiver over a two wire connection. The receiver connection in not polarity sensitive, virtually eliminating the possibility of incorrect transmitter wiring. Sensor/transmitters can be located up to 1,000 feet from receiver modules.

Sensor/transmitters are housed in shielded NEMA 4X enclosures for use in almost any industrial environment and are designed to meet intrinsic safety standards. An explosion proof version is available.

Auto-Test – Savings & Safety

A major expense in gas detection systems is the cost of regular testing to ensure that sensors are responding. This requires a technician to inspect sensors weekly and apply a small amount of gas manually to check response. ATI has developed a unique system to reduce this maintenance requirement.

Available on the GasSens A14/A11 Gas detection system is an option called “Auto-Test.” This option consists of an electrochemical gas generator closely coupled to the sensor. Every 24 hours, the receiver automatically activates the generator, producing a small amount of gas that diffuses into the sensor, just as it would if a gas leak occurred. The microcomputer is the receiver analyzes the output of the transmitter to determine that the sensor is responding normally. When proper sensor response is detected, the generator is turned off and the system goes back to normal operation. If no sensor response is detected, the TROUBLE light on the receiver will flash and the trouble relay will activate. During testing, alarm relays are inhibited so that external alarms are not activated.

The Auto-Test feature ensures that each sensor is regularly tested with gas. Premature sensor failure or blockage of the sensor membrane is quickly detected. In addition, self-testing will alert maintenance personnel when a sensor has reached the end of its useful life. Since sensors normally last anywhere from 12 months to over 3 years, this feature allows users to determine when sensor replacement is needed.

Power Supply Module

A compact universal power supply in a DIN rail module similar to the receiver was developed. The power supply will accept any AC or DC input from 85 to 225 volts, without adjustment.

Other options include a battery back up system and horn and strobe light options.

For pricing, please call AFC International at 1-800-952-3293, 219-987-6825 or fax 219-987-6826 or email

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  • Receiver modules provide electronic brains for the gas detection and alarm system
  • Isolated analog output and 4 relay outputs
  • Universal power supply modules provide DC power to receivers.
  • Power supply provides a power failure relay and charging for optional battery back-up unit.
  • LED Display
  • Analog Output
  • Two Alarm Setpoints
  • Three Alarm Relays
  • Trouble Alarm & Relay
  • Front Panel Reset Switch
  • Remote Reset Input
  • Pluggable Terminal Blocks


Concentration Display 4 Digit LED, sunlight readable
Input Digital signal, 2 wire connection to remote sensor/transmitter
Output Isolated 4-20 mA or 0-20 mA DC, 1,000 ohms maximum load
Alarms Two adjustable concentration alarms, setpoints adjustable form 5-100% of range
Alarm Indicators High intensity LED bars for Warning (low setpoint) and Alarm (high setpoint)
Indicator Function Warning indicator non-latching, alarm latching
Alarm Relays Three assignable alarm relays, 10 A, 120 VAC (5A, 250 VAC) resistive alarm relays assignable to either alarm setpoint
Relay Function Configurable for normal/fail-safe, latching/non-latching and fast/slow operation
Relay & Indicator Reset Activated from front panel switch or through remote reset
Trouble Alarm Front panel LED indicator and SPDT, 10 A 120 VAC (5A, 250 VAC) resistive relay; Relay factory set to fail-safe operation
Trouble Function Indicates loss of sensor/transmitter input or failure of sensor Auto-Test (if in use)
Gas Indicator LED bar on front panel with gas symbol overlay
Mounting Module mounts to 35 x 7.5 mm DIN rail
Electrical Connection Quick disconnect plug-in terminal blocks
Module Enclosure Noryl
Power 9-15 VDC, 30 mA maximum

Sensor Specifications

Acid Gases
0-10 ppm
0-1,000 ppm
0-500 ppm
0-100 ppm
0-1,000 ppb
0-2 ppm
Carbon Monoxide*
0-100 ppm
0-10 ppm
Chlorine Dioxide*
0-2 ppm
0-1,000 ppb
Ethylene Oxide
0-2 ppm
0-20 ppm
0-1,000 ppb
Hydrogen Chloride*
0-20 ppm
Hydrogen Cyanide*
0-20 ppm
Hydrogen Fluoride*
0-20 ppm
Hydrogen Peroxide*
0-10 ppm
Hydrogen Selenide
0-1,000 ppb
Hydrogen Sulfide*
0-50 ppm
0-2 ppm
Nitrogen Dioxide*
0-20 ppm
Nitric Oxide
0-100 ppm
0-100 ppm
0-2 ppm
0-2 ppm
0-1,000 ppb
0-20 ppm
Sulfur Dioxide*
0-20 ppm

Note: * Indicates sensors available with Auto-Test feature.

Sensor/Transmitter Specifications

Measurement Gas type and range customer specified
Transmitter Type Two wire system, current pulse operation signal
Sensor Electrochemical gas diffusion type
Accuracy Generally +/-5% of value, but limited by available calibration of gas accuracy
Zero Drift Sensor dependent but normally less than 2% per month, non-cumulative
Enclosure NEMA 4X polystyrene
Optional Enclosure Explosion proof cast aluminum, Class I, Div 1, Gps B, C & D
Electrical Connection Quick disconnect terminal blocks (two wires without polarity)
Connection Distance Up to 1,000 feet to receiver
Option Sensor Auto-Test
Power 12 VDC from receiver module

Ordering Information

For pricing of GasSens A14/A11 gas detection system, please call AFC International at 1-800-952-3293, 219-987-6825 or fax 219-987-6826 or email


GasSens A14/A11 gas detection system Literature

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