B12 gas detection transmitters
B12 gas detection transmitters

Series B12 Gas Detection Transmitters from ATI

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Description

ATi’s B12 gas detection 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.

These detectors 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.

Input Voltage
Maximum Load
12
75
14
175
16
275
18
375
20
475
22
575
24
675
26
775
28
875
30
975

Gases Available

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

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

The B12 Wet Gas Detector was developed to provide reliable measurements in wet scrubber outlets for other gas streams that might be saturated with water vapor. These gas detector systems were specifically designed for monitoring strong oxidants (chlorine, bromine, chlorine dioxide, or ozone), acid gases (HCl or HF), and hydrogen.

Increasingly stringent air quality requirements have led to expanded use of wet scrubber systems to control pollutant gases released as 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 concentrations in moisture saturated air streams presents problems for standard diffusion gas sensors. Condensing water in these air lines can quickly blind standard diffusion transmitters, rendering them inoperable.

The basic B12 Wet Gas Detector system consists of a loop-powered 2-wire transmitter and a corrosion resistant sensor specifically engineered to operate at 100% RH. Gas sensors are designed for direct insertion into vent stacks, or may be used in a flow-cell if a 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 Gas Alarm Module. This receiver system will provide direct digital display of gas concentrations, plus 3 alarm set points, a remote alarm reset input, and retransmitted 4-20 mA output. The B12 wet gas transmitter may also be used separately and tied directly to the user’s DCS, PLC, or other equipment. Either way, the B12 Wet Gas Detector is an excellent solution to a difficult gas monitoring problem.

Specifications

Gas Type
Oxidant Gases:
Cl2, Br2, ClO2, O3
Acid Gases:
HF, HCl
Hydrogen
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

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

B12 gas detection transmitters Literature

B12 Wet Gas Literature

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