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Home > Gas Detection > Fixed Point Gas Detection Systems > Series B12 2 Wire Transmitter
Series B12 2-Wire Transmitter - The Simple, Economical Gas Transmitter from Analytical Technology
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Series B12 transmitters are loop powered instruments that transmit a 4-20 mA signal linearly proportional to gas concentration. Operated from a 24 VDC power supply, the transmitter will drive loads up to 675 ohms - sufficient for most monitoring applications. Alternatively, the unit can operate at 12 VDC - with reduced output load - for applications requiring battery operation. Transmitters are normally supplied with the sensor close coupled to the enclosure. However, for special applications, the unit can be supplied with separate sensors that can be located up to 25 feet from the transmitter. Sensor duct mounting adapters and sensor flowcells can also be provided for specific applications. |
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Input Voltage
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Maximum Load
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12
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75
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14
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175
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16
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275
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18
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375
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20
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475
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22
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575
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24
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675
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26
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775
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28
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875
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30
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975
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Gases Available
| Gas |
Minimum Range
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Maximum Range
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| Acetylene |
0-500 ppm
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0-2,000 ppm
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| Acid Gases |
0-10 ppm
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0-200 ppm
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| Alcohol |
0-500 ppm
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0-2,000 ppm
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| Ammonia |
0-100 ppm
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0-2,000 ppm
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| Arsine |
0-1,000 ppb
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0-5,000 ppb
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| Bromine |
0-1 ppm
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0-200 ppm
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| Carbon Monoxide |
0-100 ppm
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0-10,000 ppm
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| Chlorine |
0-1 ppm
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0-200 ppm
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| Chlorine Dioxide |
0-1 ppm
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0-200 ppm
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| Diborane |
0-1,000 ppb
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0-5,000 ppb
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| DMA |
0-100 ppm
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0-200 ppm
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| Ethylene Oxide |
0-20 ppm
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0-200 ppm
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| Fluorine |
0-1 ppm
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0-200 ppm
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| Formaldehyde |
0-20 ppm
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0-200 ppm
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| Germane |
0-1,000 ppb
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0-5,000 ppb
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| Hydrogen |
0-1,000 ppm
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0-10%
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| Hydrogen Chloride |
0-10 ppm
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0-200 ppm
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| Hydrogen Cyanide |
0-10 ppm
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0-200 ppm
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| Hydrogen Fluoride |
0-10 ppm
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0-200 ppm
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| Hydrogen Peroxide |
0-10 ppm
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0-2,000 ppm
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| Hydrogen Selenide |
0-1,000 ppb
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0-5,000 ppb
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| Hydrogen Sulfide |
0-10 ppm
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0-1,000 ppm
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| Iodine |
0-1 ppm
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0-200 ppm
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| Nitrogen Dioxide |
0-10 ppm
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0-200 ppm
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| Nitric Oxide |
0-50 ppm
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0-500 ppm
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| NOx |
0-50 ppm
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0-500 ppm
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| Oxygen |
0-5%
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0-25%
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| Ozone |
0-1 ppm
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0-200 ppm
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| Phosgene |
0-1 ppm
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0-100 ppm
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| Phosphine |
0-1,000 ppb
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0-2,000 ppm
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| Silane |
0-10 ppm
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0-50 ppm
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| Sulfur Dioxide |
0-10 ppm
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0-200 ppm
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Specifications
| Range |
Supplied with standard range for each gas unless otherwise specified |
| Accuracy |
Generally ±5% of value, but limited by available calibration gas accuracy |
| Electronic Repeatability |
±1% of full scale |
| Electronic Linearity |
±0.5% of full scale |
| 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 |
| Output |
Loop powered 4-20 mA, 675 ohms maximum at 24 VDC (except combustible gas) |
| Power |
12-30 VDC |
| Enclosure |
NEMA 4X polystyrene. Explosion proof optional, Class 1, Div 1,
Groups B, C & D |
| Controls |
Zero and span potentiometers mounted on transmitter circuit board |
| Display |
Optional 3-digit LCD (not available with explosion proof enclosure) |
B12 Series 2-Wire Transmitter for Wet Gas Streams
Increasingly stringent air quality requirements have led to expanded use of wet scrubber systems to control air emissions. Chlorine storage facilities and chemical process plants are frequently required to scrub exhaust gas streams to remove halogen and acid gases. Unfortunately, monitoring reactive gas concentration in moisture saturated air streams presents problems for standard diffusion sensors. Condensing water in these air lines can quickly blind diffusion sensors, rendering them inoperable.
ATI's Series B12 Wet Gas System was developed to meet the need for reliable measurements in wet scrubber outlets for other gas streams that might be saturated with water vapor. Systems have been developed for monitoring strong oxidants (chlorine, bromine, chlorine dioxide, or ozone), acid gases (HCl or HF) and hydrogen.
The basic B12 Wet Gas System consists of a loop-powered 2-wire transmitter and a corrosion resistant sensor specifically engineered to operate at 100% RH. Sensors are designed for direct insertion into vent stacks or may be used in a flowcell if sample can be pumped to the sensor.
When remote display and alarm relay functions are required, the B12 Wet Gas Transmitters can be connected to ATI's B14 Alarm Receiver System. This system will provide direct digital display of gas concentration, plus 3 alarm setpoints, remote alarm reset input and retransmit 4-20 mA output. Or, the B12 transmitter may be used separately and tied directly to the users DCS, PLC or other equipment. Either way, the B12 is an excellent solution to a difficult monitoring problem.
Specifications
| Gas Type |
Oxidant Gases:
Cl2, Br2, ClO2, O3
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Acid Gases:
HF, HCl
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Hydrogen
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| Range |
0-10, 0-20, 0-50 or
0-100 ppm |
0-10, 0-20, 0-50 or
0-100 ppm |
0-2% or 0-10% |
| Accuracy |
Generally ±5% of value, but limited by available calibration gas accuracy |
| Electronic Repeatability |
±1% of full scale |
| Electronic Linearity |
±0.5% of full scale |
| Output |
Loop powered 4-20 mA, 675 ohms, maximum at 24 VDC |
| Power |
12-28 VDC |
| Enclosures |
NEMA 4X polystyrene, LCD display optional.
Explosion-proof optional. Class 1, Div 1, Groups B, C & D |
| Controls |
Zero and span potentiometers mounted on transmitter circuit board |
| Operating Temperature |
0 to 50°C |
| Sensor Materials |
Noryl |
| Sensor Cable |
25 feet standard, 100 feet maximum |
Ordering Information
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