ATI's D12-IR Infrared Toxic Gas Transmitter is great for measurement and data transmission of combustible gas (methane, ethane, propane, or butane), carbon dioxide, volumetric methane, or nitrous oxide to a remote display and alarm equipment in a 3-wire mode. It offers reliable service since it uses the compact IR sensor.  These gas sensors will have a longer life and provide gas measurement stability because of the infrared sensing technology.  Although the presence of silicon vapors, hydrogen sulfide, and halogenated hydrocarbons can quickly degrade sensor performance. Because the IR gas sensor is always in active state, the infrared transmitter continuously monitors critical sensor functions and indicates any sensor problems, both on the display and via the analog output. 

 

D12-IR Features

LCD Graphics Display: Gas concentrations are displayed in large, easy to read numbers. The display also provides alarm indication and complete menus for setting up operating parameters. A backlight is standard for good visibility in low light.

Internal Data Logger: Measured gas values are stored at user definable intervals and can be recalled when needed on the LCD display. Data can be downloaded using the MODBUS™ interface.

Non-Intrusive Operation: Operating functions such as calibration, alarm setup, alarm reset, data view, and setup options are all available using a magnetic tool. It is not necessary to open the enclosure when making adjustments.

Password Protection: Program settings stored in the transmitter may be protected by a user selectable 4-digit password. Operators may still review all functions, but changes may only be made by authorized personnel.

Modular Electronics: The D12 electronic assembly plugs easily into the power supply board in the base of the enclosure. Transmitters can be removed for wiring and quickly replaced in the event of a fault condition.

Explosion Proof Enclosure: Transmitters are designed for operation in hazardous areas. The cast aluminum housing for the D12 transmitter is rated for Class 1, Division 1, Group B, C, D locations and is UL, FM, and CSA certified.

Scalable 4-20 mA: The output range for a particular sensor is programmable within the range boundaries set in that sensor.

Explosion-proof Sensor Design: Infrared sensing element is protected by stainless steel housing and flame arrestor.

Fail-safe Sensor Operation: Because the IR sensor is always in active state, the transmitter continuously monitors critical sensor functions and indicates any sensor problems, both on the display and via the analog output.

High Range Methane Measurement: D12-IR transmitters can be factory calibrated for volumetric methane measurement in special applications. Ranges from 0-10% to 0-100% by volume are available. A separate sensor is also available for high percent level measurements of heavier hydrocarbons such as butane and propane.

Sensor Calibration History: Each time a sensor is zeroed or spanned, the data is stored in memory. Calibration history can be recalled and sensor condition reviewed by operating personnel when necessary.

Three Internal Alarm Relays: Optional relay outputs can be used for local alarm functions. All relays are programmable for set point, hysteresis, on-delay, off-delay, and other variables. Even a remote reset feature is provided for in the transmitter design.

Analog Output Simulation: Transmitter analog output can be set to user definable values. This provides for complete loop testing without the need to apply gas to the sensor.

Relay Output Simulation: Alarm relays may be activated on command to allow testing of local alarm devices. Any combination of relays may be activated based on operator selection. Output and alarms may also be inhibited for maintenance and calibration.

Serial Communication Interface: The transmitter is available with either HART™ or MODBUS™ protocol. The HART™ protocol supports the HART™ Universal and Common Practice Commands at 1200 baud using the Bell 202 FSK modem standard. The MODBUS™ protocol supports 9600 baud access to concentration and status information, and supports alarm setup and many other functions on either RS485 or RS232 (software selectable).

 

D12 Options (how to order)

Note: The D12 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.

Transmitter Type:
Choose Electrochemical sensor for toxic gas applications.  Choose combustible gas sensor for combustible gasses and environments.  Either configuration is available with or without the optional alarm board.

Sensor Module:
Choose the gas and range of detection required for your application

Digital Output:
Standard 4-20 mA output is provided with all sensors
HART interface is available for all sensors
Modbus interface is only available for RS-485 sensors, and 115 VAC sensors. 

 

D12 Specifications

Sensor Type	Single path Non-dispersive Infrared (NDIR)
Range	User adjustable within limits of selected sensor
Response Time	90% in 10 seconds
Accuracy	Generally ±5% of value, but limited by available calibration gas accuracy
Repeatability	±1% (Electronic)
Linearity	±0.5% (Electronic)
Zero Drift	Less than 1% full scale per month, non-cumulative
Span Drift	Dependent on operating environment but generally less than 1% per month
Analog Output	4-20 mA, 675 ohms maximum at 24 VDC
Power Requirements	12 - 30 VDC, 350 mA maximum in 3-wire connection
Serial Interface:	HART™ (1200 baud modem interface ) MODBUS™ (1200-9600 – RS232 or RS485, s/w  selectable)
Alarm Relays:	Three SPDT, 5 A @ 230 VAC resistive
Relay Coil:	Programmable either normally energized or normally deenergized.
Controls:	4 magnetic switches on front of transmitter
Enclosure	Explosion-proof, Class 1, Div. 1, Groups B, C, & D.
Display	Graphics LCD, 96w x 32h, backlit, transflective