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. 

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.

  A14/A11 monitor with A11 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. 

 ATI XP rated sensor for A14/A11 monitor

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.

More Information
Manufacturer ATI
Call For Price No
Gas Acid Gases, Acteylene (C2H2), Alcohol, Ammonia (NH3), Arsine (AsH3), Bromine (Br2), Carbon Monoxide (CO), 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 Fluoride (HF), 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 Add Auto Test Generator
Min, Max, Avg No
Voltage Output None
Power Requirements 12 VDC power at 300 mA
Datalogging No
Rechargeable No
Field Replaceable Battery No
Warranty 1 Year
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