A14/A11 Gas Detector

The GasSens A14/A11 Modular Gas Detector is a flexible component system providing a variety of options to meet individual gas detection and alarm requirements.

Multipoint sensor is capable of measuring toxic gasses in up to 12 locations.  32 separate gasses can be detected with the GasSens Detector. 

Choose your configuration or contact us for help finding the right solution for your application!

As low as $1,045.00
The GasSens A14/A11 Modular Gas Detector is a flexible component system providing a variety of options to meet individual gas detection and alarm requirements. From chemical and petrochemical plants to food processors, the GasSens system can be applied to the simplest or most complex gas detection application. Economical and low maintenance, this system is your best choice for reliable gas leak detection. GasSens gas 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 gas sensor testing system, greatly reducing operator testing requirements.

Receiver modules provide the electronic brains for the gas 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 1000 feet from sensor/transmitters for remote indication, or can provide local control functions such as valve shutoff while transmitting a 4-20 mA signal to remote displays or data loggers.


Standard unit operates on 12 VDC power only.  Optional universal power supply modules provide DC power to receivers. The power supply is housed in a compact module similar to the receiver, and will accept inputs from 85 to 265 volts, AC or DC, without adjustment. The power supply also provides a power failure relay and charging for an optional battery back-up unit.


GasSens A14/A11 Options (how to order)

Note: The GasSens A14/A11 is highly customizable to fit your every need.  Please review the options closely to ensure you choose the right configuration for your application.  Please call if you have any questions or need help configuring the right sensor for your application.

Sensor Module:

Choose the gas detection required for your application.  Range shown is standard range; each sensor can be calibrated for a custom range for an additional $50.  See chart below to see minimum and maximum detection ranges for each sensor.  Contact us for details on this and to verify we can calibrate for your specific range.

A14 Transmitter Options:

The A14 can be customized with the following add-on options

  • Audible Alarm is a beeper style alarm that will be integrated into the A14 and set to alarm using the user settable relays
  • Strobe Light Red Strobe light will be mounted to the top of the A4 and  integrated into the A14 and set to alarm using the user settable relays
  • Battery Backup will provide a reserve power source for your A14 in the event of a power outage
  • XP Rated Sensor Module is an enclosure for the remote sensor that is XP rated
  • Calibration Adapter will allow a flow cell style adapter to be fitted to the sensor so the A23-14 calibrator can be used to calibrate the A11 Sensor Modules
  • Sensor Flowcell will fit to the opening on the A11 Sensor and allow a gas flow to be used to measure gasses

 Auto-Test Generator:

Gas generators permanently installed on the sensor verify sensor operation by providing a “bump test” of the sensor from daily to once a week.  See what sensors can use the specific Auto-Test Generators from the chart at the bottom of the product page.


GasSens A14/A11 Features

  • LED Display: Indicates gas concentration directly in PPM, PPB, or %. The display may be operated in high intensity (sunlight readable) mode for outdoor use or in normal mode for indoor applications.

  • Analog Output: An isolated 4-20 mA output is standard. The output will drive loads up to 1000 ohms for use in recording, data logging, or computer input

  • Two Alarm Set points: Alarm set points are factory adjusted to standard values but may be set to any value from 5% to 100% of range. Front panel LED’s marked “Warning” and “Alarm” indicates the status of each alarm set point. A standard alarm delay of 2 seconds or a longer delay of 10 seconds may be selected. In addition, alarms may be switch programmed to activate either above or below the set point

  • Three Alarm Relays: Output relays are SPDT with unpowered contacts for use in activating external signaling devices, control elements, or for input to telemetry or annunciator systems. Each relay may be assigned to either alarm set point for application flexibility. Relays are factory set to energize on alarm, but may be switch programmed for fail safe operation. Relays may also be set for either latching or non-latching operation.

  • Trouble Alarm & Relay: Should the sensor/transmitter input be lost, a trouble light (LED) on the front panel will flash and an associated relay will activate. For those systems equipped with the sensor Auto-Test feature, this alarm will also activate if the sensor does not respond to the automated gas test.

  • Front Panel Reset Switch: A single front panel switch marked A/R (Acknowledge/ Reset) serves a number of functions. When an alarm occurs, the switch will silence an audible horn wired to the module and will change the alarm lights from flash to steady on. After the alarm condition has cleared, the switch may be used to reset any latching alarms. The switch will also activate an electronic module test, inhibit alarm contacts, and activate the Auto-Test.

  • Remote Reset Input: Terminals are provided for connection of a remote reset switch so that alarms can be acknowledged from a remote location or through a telemetry system.

  • Pluggable Terminal Blocks: External electrical connections are made to plug-in terminal blocks. Should module service ever be needed, modules can be replaced in minutes.


A14 Receiver Module Specifications

4 digit LED, sunlight readable
Input Digital signal, 2 wire connection to A11 remote sensor/transmitter
Output Isolated 4-20 mA DC, 1000 ohms maximum load
Alarms Two adjustable concentration alarms, set points adjustable from 5-100% of range
Alarm Indicators
High intensity LED bars for WARNING (low set point) and ALARM (high set point)
Indicator Functions WARNING indicator non-latching, ALARM latching
Alarm Relays
Three assignable alarm relays, 10 A, 120 VAC (5 A, 250 VAC) resistive Alarm relays assignable to either alarm set point
Relay Function Configurable for normal/fail-safe, latching/nonlatching, and fast/slow operation
Relay & Indicator Reset Activated from front panel switch or through remote reset
Trouble Alarms Front panel LED indicator and SPDT, 10 A, 120 VAC (5A, 250 VAC) resistive relay; Relay factory set to fail-safe operation
Trouble Functions 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 Nory
Size 2.8"W x 3.6"L x 2.3"D (70 mm x 90 mm x 58 mm)
Operating Temperature -40° to +55°C
Humidity 0-99% non-condensing
Power 9-15 VDC, 300 mA maximum


A11 Sensor/Transmitter Specifications

Sensor Type Electrochemical Cell
Range User adjustable within limits of selected sensor
Response Time Sensor dependent
Accuracy Generally ±5% of value, but limited by available calibration gas accuracy.
Zero Drift Less than 2% full scale per month
Transmitter Type
Two wire system, current pulse position signal
Electrical Connection
Quick disconnect terminal blocks (two wires without polarity)
Connection Distance   
Up to 1000 feet (300 m) to receiver
Operating Temperature
-25° to +55°C (-5° for oxygen)
Humidity 0-95% non-condensing
Options Sensor Auto-Test (available for most gases)
Enclosure NEMA 4X polystyrene
Size (Sensor Transmitter with Auto-Test) 3.7"L x 6.5"W x 2.2"D (94 mm x 163 mm x 57 mm)
Power 12 VDC from receiver module


Module Enclosure Sizes

Single Module Enclosure: NEMA 4X polystyrene, 4.33"W x 7.09"H x 4.33"D (110 x 180 x 110 mm)
Two Module Enclosure: NEMA 4X polystyrene, 7.17"W x 7.09"H x 4.33"D (182 x 180 x 110 mm)
Three Module Enclosure: NEMA 4X polystyrene, 10.0"W x 7.09"H x 4.33"D (254 x 180 x 110 mm)
Six Module Enclosure: NEMA 4X polystyrene, 10.0"W x 14.21"H x 4.33"D (254 x 361 x 110 mm)


A11 Sensor/Transmitter

GasSens gas detection systems employ electrochemical sensors developed and manufactured by ATI. Expertise in electrochemistry and sensor design provides the foundation for leak detection systems that perform continuously with minimal maintenance. Sensors are rated for ambient temperatures from -25° to +50°C, allowing both indoor and outdoor applications. Excellent zero stability and high sensitivity and selectivity combine to make ATI sensors the best available on the market today.

A11 Gas Sensor for A14 Detector - Chlorine sensor


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 is not polarity sensitive, virtually eliminating the possibility of incorrect transmitter wiring. Sensor/transmitters can be located up to 1000 feet from receiver modules.

XP Rated Sensor/Transmitter

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 of the transmitter is also available for applications where this type of protection is preferred. Combustible gas transmitters are always explosion-proof.

A14/A11 Explosion Proof Sensor


Sensor Range Specifications:

Please contact us with any questions on what sensor might be right for you, or if other sensors are available for your application.

Gas Min Range        Max Range        Standard range      
Acid Gasses
0-10 ppm 0-100% 0-10 ppm
Acetylene 0-100 ppm 0-2000 ppm 0-1000 ppm
Alcohol 0-500 ppm 0-2000 ppm 0-500 ppm
Ammonia 0-50 ppm 0-500 ppm 0-100 ppm
Arsine 0-1000 ppb 0-10ppm
0-1000 ppb
Bromine 0-1 ppm  0-100 ppm  0-2 ppm
Carbon Monoxide  0-50 ppm  0-500 ppm  0-100 ppm
Chlorine  0-1 ppm   0-100 ppm  0-10 ppm
Chlorine Dioxide   0-1 ppm  0-100 ppm   0-2 ppm
Combustible Gas  0-50% LEL
0-100% LEL   0-2 ppm
Diborine  0-1000 ppb
 0-10 ppm 0-1000 ppb
Ethylene Oxide  0-20 ppm 0-200 ppm 0-20 ppm
Fluorine  0-1 ppm 0-100 ppm 0-2 ppm
 0-20 ppm 0-200 ppm 0-20 ppm
Germane  0-1000 ppb  0-10 ppm 0-1000 ppb
Hydrogen  0-2000 ppm
0-10% 0-4%
Hydrogen Chloride   0-10 ppm  0-100 ppm  0-20 ppm
Hydrogen Cyanide   0-10 ppm 0-100 ppm 0-20 ppm
 Hydrogen Flouride
  0-10 ppm  0-100 ppm 0-20 ppm
 Hydrogen Sulfide
  0-10 ppm  0-100 ppm  0-50 ppm
 Hydrogen Peroxide
 0-10 ppm  0-100 ppm 0-10 ppm
 Hydrogen Selenide
0-1000 ppb 0-10 ppm 0-1000 ppb
 0-1 ppm  0-100 ppm  0-2 ppm
 Nitric Oxide
 0-20 ppm  0-250 ppm 0-100 ppm
 Nitrogen Dioxide
 0-10 ppm 0-100 ppm 0-100 ppm
 Oxygen  0-5%
0-25 %
 Ozone  0-1 ppm  0-100 ppm
0-2 ppm
 Phosgene  0-2 ppm
 0-100 ppm
0-1000 ppb
 Phosphine  0-10 ppm  0-50 ppm  0-10 ppm
 Silane  0-10 ppm  0-100 ppb 0-20 ppm
Sulfer Dioxide 0-10 ppm  0-100 ppb 0-20 ppm


Replacement Sensor

Replacement Sensors for the A11 Sensor/Transmitter are available. Replacement sensors can be purchased online HERE.

A11 Sensor/Transmitter Replacement Sensor


Auto-test Generator

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 most ATI digital sensor/transmitters 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 in 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.

ATI A11 sensor with Auto-Test generator installed

The Auto-test option requires a gas generator, which must be compatible with the installed sensor’s gas type, and full-scale range. Table below lists gas compatible generators and sensors.

Auto-test Generator   Generator Type       
Compatible Sensors    
00-0097 Chlorine (Cl2)                    
Bromine (Br2)

Chlorine (Cl2)

    Chlorine Dioxide (ClO2)
    Flourine (F2)
    Ozone (O3)
    Hydrogen Flouride (HF)
    Nitrogen Dioxide (NO2)
    Iodoine (I2)
 00-0098  Sulfer Dioxide
Sulfer Dioxide (SO2)
     Hydrogen Dioxide (H2O2)
    Hygrogen Cyanide (HCN)
00-0099 Ammonia (NH3) Ammonia (NH3)
 Hydrogen Sulfide
Hydrogen Sulfide (H2S)
    Hydrogen Chloride (HCL)
    Nitric Oxides (NOx)
00-0257 Carbon Monoxide Carbon Monoxide (CO)



Wireless Monitoring & Data Logging Kit

Use the Wireless Monitoring & Data logging Kit with your fixed mount monitor to connect it to the internet allowing access from anywhere. Receive Instant notifications with free text and email alerts. This is a great addition for your fixed mount gas detector.


Use this kit to connect your Fixed mount gas detector to the internet allowing remote access from anywhere.A14/A11 with Remote Monitoring capabilites



Battery Back-up

The A14 can be ordered with an optional battery back-up.  This automated battery back-up can be wired to the A14 and provide a safety system that will keep your A14 operational in the event of a power outage.  The base unit, remote sensors, strobe and siren will all be operational in a power outage for 8-hours using the battery back-up.

A14 Battery back-up


Optional Strobe and Siren

The A14 can be configured with the optional strobe light or optional siren.  Both, or either will work with the internal relays in the A14.  User settable relays can be set to trigger the visual strobe light or siren.  Both the strobe and siren will be mounted to the enclosure prior to shipment.  No installation is required upon delivery, only relay set-points need to be configured by the customer.

A14 optional strobe light or siren




A14-A11 Product Spec Sheet

A14-A11 Support Drawings

A14-A11 Product Manual with Bromine Gas Sensor

A14-A11 Product Manual with Chlorine Gas Sensor

A14-A11 Product Manual with Chlorine Dioxide Gas Sensor

A14-A11 Product Manual with Flourine Gas Sensor

A14-A11 Product Manual with Ozone Gas Sensor

A14-A11 Product Manual with Ammonia Gas Sensor

A14-A11 Product Manual with Carbon Monoxide Gas Sensor

A14-A11 Product Manual with Hydrogen Gas Sensor

A14-A11 Product Manual with Oxygen Gas Sensor

A14-A11 Product Manual with Phosgene Gas Sensor

A14-A11 Product Manual with Hydrogen Chloride Gas Sensor

A14-A11 Product Manual with Hydrogen Sulfide Gas Sensor

A14-A11 Product Manual with Nitric Oxide Gas Sensor

A14-A11 Product Manual with Nitrogen Dioxide Gas Sensor

A14-A11 Product Manual with Sulfer Dioxide Gas Sensor

A14-A11 Product Manual with Hydride Gas Sensor

A14-A11 Product Manual with Silane Gas Sensor

A14-A11 Product Manual with Hydrogen Peroxide Gas Sensor

A14-A11 Product Manual with Iodine Gas Sensor

A14-A11 Product Manual with Acid Gasses Sensor

A14-A11 Product Manual with ETO Gas Sensor

A14-A11 Product Manual with Alchohol Gas Sensor


 Links to more info:</span

More Information
Manufacturer ATI
Call For Price No
Gas Acid Gases, Acteylene (C2H2), Alcohol, Ammonia (NH3), Arsine (AsH3), Bromine (Br2), Carbon Dioxide (CO2), Chlorine (Cl2), Chlorine Dioxide (ClO2), Diborane (B2H6), Ethylene Oxide (ETO), Fluorine (F2), Formaldehyde (CH2O), Germane (GeH4), Hydrogen (H2), Hydrogen Chloride (HCl), Hydrogen Cyanide (HCN), Hydrogen Peroxide (H2O2), Hydrogen Selenide (H2Se), Hydrogen Sulfide (H2S), Iodine (I2), Nitric Oxide (NO), Nitrogen Dioxide (NO2), Nitrogen Oxides (NOx), Oxygen (O2), Ozone (O3), Phosgene (COCl2), Phosphine (PH3), Silane (SiH4), Sulfur Dioxide (SO2)
4-20 mA Output Yes
Relays 3 Relays
Field Replaceable Sensor Yes
Auto Test Generator None
Min, Max, Avg No
Voltage Output None
Power Requirements 12 VDC power at 300 mA
Datalogging No
Warranty 1 Year
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