A12 2 Wire Transmitter
A12 2 Wire Transmitter

A12 2-Wire Toxic Gas Transmitter

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Description

ATi’s A12 2-Wire UniSens Universal Toxic Gas Transmitter handles 28 different gases, providing an economical, reliable, accurate and flexible gas measurement system. Combining universal electronics, bench calibration capability, automatic sensor verification, fault detection and alarming, and superior sensor technology, UniSens is your best transmitter choice.

UniSens is designed for ambient gas monitoring in all kinds of industrial environments: gas storage areas, gas compressor rooms, process piping galleries, rail car sidings, analyzer shacks, gas cabinets, chemical process areas, and more. In fact, the UniSens transmitter can be used most anywhere that hazardous gas conditions might develop either through leakage or through natural buildup.

ATi sensing modules consist of an electrochemical gas diffusion sensor and a solid state memory assembly. Developed and manufactured exclusively by ATi, our electrochemical sensors provide excellent response time, maximum selectivity and superior temperature stability for reliable gas sensing in a wide range of environments. The companion memory assembly stores operational information and calibration constants, along with gas sensor identification, sensing module range and software revision level. Complete sensing modules are housed in convenient snap-in packages that mate easily with UniSens transmitters.

This unique combination of sensor and memory lets you calibrate sensing modules with any UniSens transmitter. Instead of calibrating in the field, you can bench calibrate sensing modules with a spare transmitter; once the sensors are snapped into a field transmitter, their calibration constants upload automatically.

Auto-Test – Savings & Safety

Available on many ATI sensing modules, the optional Auto-Test gas generator can cut testing costs dramatically by automatically verifying sensor response. The Auto-Test gas generator is coupled to the end of the sensor as an integral part of the sensing module. Every 24 hours, the transmitter activates the generator and monitors the sensor for response. If the sensor responds properly, the system reverts to normal operation; if it fails, output is driven to 3.6 mA to signal trouble. (During testing, the output signal is held at the pre-test value). The transmitter maintains a log of completed tests and can display the time until the next scheduled test. An operator can manually activate the Auto-Test, too.

Features

  • Interchangeable sensing modules
  • Auto-Test sensor verification
  • Non-intrusive magnetic controls
  • 28 different gases
  • Off site calibration
  • Integral LCD display
  • Output simulation
  • CSA approved
  • Intrinsically safe & explosion proof

Gases Available

Gas
Range Available
AutoTest Range
Acetylene
0-2,000 ppm
–
Acid Gases
0-10, 0-20, 0-100, 0-200 ppm
0-10, 0-20 ppm
Alcohol
0-500, 0-1,000, 0-2,000 ppm
–
Ammonia
0-50, 0-100, 0-200, 0-500, 0-1,000 ppm
0-50, 0-100 ppm
Arsine
0-1,000 ppb
–
Bromine
0-1, 0-2, 0-5, 0-10, 0-50, 0-100 ppm
0-1, 0-2, 0-5, 0-10 ppm
Carbon Monoxide
0-50, 0-100, 0-200, 0-500 ppm
0-50, 0-100 ppm
Chlorine
0-1, 0-2, 0-5, 0-10, 0-50, 0-100 ppm
0-1, 0-2, 0-5, 0-10 ppm
Chlorine Dioxide
0-1, 0-2, 0-5, 0-10, 0-50, 0-100, 0-1,000ppm
0-1, 0-2, 0-5, 0-10 ppm
Diborane
0-1,000 ppb
–
Ethylene Oxide
0-20, 0-200 ppm
–
Fluorine
0-1, 0-2 ppm
0-1, 0-2 ppm
Formaldehyde
0-20, 0-200 ppm
–
Germane
0-1,000 ppb
–
Hydrogen
0-1,000, 0-2,000 ppm, 0-4%, 0-10%
–
Hydrogen Chloride
0-10, 0-20, 0-100 ppm
0-10, 0-20 ppm
Hydrogen Cyanide
0-10, 0-20, 0-100 ppm
0-10, 0-20 ppm
Hydrogen Fluoride
0-10, 0-20, 0-100, 0-200 ppm
0-10, 0-20 ppm
Hydrogen Peroxide
0-10, 0-20, 0-50, 0-500, 0-1,000 ppm
0-10, 0-20 ppm
Hydrogen Selenide
0-1,000 ppb
–
Hydrogen Sulfide
0-10, 0-25, 0-50, 0-100, 0-500 ppm
0-10, 0-25, 0-50 ppm
Iodine
0-1, 0-2, 0-5, 0-10, 0-50, 0-100 ppm
0-1, 0-2, 0-5, 0-10 ppm
Nitrogen Dioxide
0-20, 0-200 ppm
0-20 ppm
Nitric Oxide
0-25, 0-50, 0-100, 0-200 ppm
–
NOx
0-25, 0-50
–
Oxygen
0-5%, 0-25%
–
Ozone
0-1, 0-2, 0-5, 0-10, 0-50, 0-100 ppm
0-1, 0-2, 0-5, 0-10 ppm
Phosgene
0-1, 0-2, 0-5, 0-10, 0-100 ppm
–
Phosphine
0-1,000, 0-2,000 ppb 0-10, 0-1,000 ppm
–
Silane
0-10 0-20 ppm
–
Sulfur Dioxide
0-10, 0-20, 0-100 ppm
0-10, 0-20 ppm

Specifications

Range Supplied with standard range for each gas unless otherwise specified
Display 4 1/2″ digit LCD
Accuracy Generally ±5% of value, but limited by available calibration gas accuracy
Electronic Repeatability ±1%
Electronic Linearity ±0.5%
Zero Drift Sensor dependent, but generally less than 2% of full scale per month, non-cumulative
Span Drift Application dependent, but generally less than 3% per month
Power 12-30 VDC
Output Loop powered 4-20 mA, 675 ohms maximum at 24 VDC
Loop Simulation Operator selectable outputs of 4, 12, 20 and 3.6 mA (trouble indicator)
Enclosure NEMA 4X and explosion proof cast aluminum, Class 1, Div 1, Groups B, C & D
Controls Magnetic controls activated externally through glass window
Sensor Modular plug-in unit with calibration data, gas type and range in sensor memory
Sensor Life Average greater than two years

Ordering Information

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

Downloads

A12 2-Wire Toxic Gas Transmitter literature

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