Series D12 Digital Gas Detection Transmitter from ATI
Series D12 Digital Gas Transmitter from Analytical Technology features loop powered transmission, loop powered with HART, transmitter with integral relay or a transmitter with MOBUS. Gas detection systems come in all shapes and sizes. Some require simple 4-20 mA transmission, some are better suited to local alarm relay functions, some relay require both. And increasingly, digital communication directly to the transmitter is desirable. Not to mention the fact that self-testing sensor capability adds to the reliability of any system.
- For measurement and data transmission to remote display and alarm equipment, the D12 will operate in 2-wire mode (except for combustible gas). Integral LCD indicates gas concentration as well as alarm conditions.
- Loop powered with HART for plants operating with HART protocol communications systems, the D12 can be supplied with this option. Our HART output supports both 4-20 mA and constant current mode of operation.
- Transmitter with integral relays for systems requiring local alarm functions, or systems where discrete outputs are desired, the D12 can provide 3 relay outputs. Relays are assignable to any alarm set point or fault condition and are fully programmable for set point, hysteresis and time delay.
- When RS-485 communication is desirable, D12 transmitters with alarm relays can be supplied with a MODBUS interface. Software supports up to 247 unique addresses for large system use.
- Operating functions such as calibration, alarm setup, alarm reset, data view and setup options are all available using a magnetic tools. It is not necessary to open the enclosure when making adjustments.
- Measured gas values are stored at user definable intervals and can be recalled when needed on the LCD display. Data can be downloaded using MODBUS interface.
- Gas concentrations are display in large, easy to read numbers. The display also provides alarm indication and complete menus for setting up operating parameters. a backlight is available when operating in 3 wire mode.
- Program settings stored in the transmitters 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.
- 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.
- Transmitters are designed for operation in hazardous areas. The case 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.
- The output range for a particular sensor is programmable within the range boundaries set in that sensor.
- 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.
- 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.
- 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.
- 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 RS-485 or RS-232(software selectable).
No matter which style of transmitter you choose, your D12 Digital Gas Transmitter includes features that enhance performance and provide operational flexibility, starting with out own advanced electrochemical sensors.
- Every toxic gas transmitter will accept up to 46 different sensors, greatly reducing the need for multiple transmitter models. The self aligning sensor holder simply plugs in, with automatic sensor recognition and verification when contact is made.
- Plug-in sensors store calibration data, allowing sensors to be calibrated separately from the transmitter. This allows bench calibration (or factory calibration) of sensors to reduce the necessity for carrying calibration gas around the plant. Sensors are even interchangeable with ATI’s C16 PortaSens II portable gas detector.
- Each time a sensor is zeroed or calibrated, the data is stored in sensor memory. Calibration history can be recalled and sensor condition reviewed by operating personnel whenever necessary.
Sensor Response Verification
For many toxic and combustible gases, ATI offers a unique sensor response testing system unmatched by any competitive transmitter. Even outdoors in high wind conditions, the Auto-Test system provides reliable response checks to insure system integrity.
- Sensor response is verified with an actual gas sample, generated on demand. Electronic sensor and circuit tests just cannot provide the same level of confidence.
- Auto-Test gas generators are easily installed and removed when necessary. Generators store run time information accessible to operators and are automatically tested for compatibility with the installed sensor.
- Systems using the Auto-Test generators store a testing log indicating the number of tests performed as well as test results. This data is stored in individual sensor memory for later review.
|0-200/1,000 ppm||1,000 ppm||00-1359|
|0-1/5 ppm, low Cl2 response||2 ppm||00-1425|
|0-200/1,000 ppm||1,000 ppm||00-1010|
(*) Indicates Auto-Test available
A combustible sensor is also available for the D12 system. An Auto-Test is available.
|Range||Supplied with standard range for each gas unless otherwise specified|
|Response Time||Sensor dependent|
|Accuracy||Generally ±10% of value, but limited by available calibration gas accuracy|
|Electronic Repeatability||±1% of full scale|
|Electronic Linearity||±0.5% of full scale|
|Zero Drift||Less than 2% of full scale per month, non-cumulative|
|Span Drift||Application dependent, but generally less than 3% per month|
|Alarms||Three concentration alarms (Caution, Warning, Alarm) programmable for setpoint, hysteresis, alarm delay and manual or automatic reset. One fault alarm with programmable output and relay response.|
|Analog Output||Loop powered 4-20 mA, 675 ohms maximum at 24 VDC (except combustible gas)|
|Serial Interface||HART (1200 baud modem interface), MODBUS (1200-9600 – RS-232 or RD-485, software selectable)|
|Power||12-30 VDC, 25 mA maximum in loop powered mode, 12-30 VDC, 200 mA maximum in 3-wire mode|
|Alarm Relays||Three SPDT, 5A@230 VAC resistive|
|Relay Coil||Programmable either normally energized or normally deenergized|
|Enclosure||Explosion proof Class 1, Div 1, Groups B, C, D|
|Sensor Auto-Test||Optional gas generator dependent on sensor|
|Controls||4 magnetic switches on front of transmitter|
|Temperature||-30° to + 60°C for toxics, -10°C minimum for oxygen sensor|
For pricing on the D12 Digital Gas Transmitter , please call AFC International at 1-800-952-3293, 219-987-6825 or fax 219-987-6826 or email firstname.lastname@example.org.