Download Hydrogen Sulfide - Conspec Controls

Conspec Gas Facts • Hydrogen Sulfide (H 2S)
Potential industries and
applications for hydrogen
sulfide detection:
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Coal Mining
Oil and Gas Extraction
Petrochemical Refining
Chemical Production
Metals Refining
Coal-Fired Power Plants
Heavy Water Production
Plants
Hydrogen sulfide (H2S) is a colorless, very poisonous, flammable gas with a foul
odor similar to the odor of rotten eggs. In anaerobic digestion, H 2S results from the
bacterial breakdown of organic matter in the absence of oxygen, as in swamps and
sewers. It also occurs in volcanic gases, natural gas, and some well waters.
Hydrogen sulfide is about 20% heavier than air, with a specific gravity of 1.19. Its
odors can be recognized in concentrations of <1 mg/kg (air). The odor of hydrogen
sulfide will increase as the gas becomes more concentrated. However, in
concentrations of ≥150 mg/kg (air), it is not detectable by odor. Due to this property,
relying totally on the sense of smell to detect hydrogen sulfide gas can be extremely
dangerous because the disappearance of the odor could mean that the gas
concentrations have increased.
Hydrogen sulfide is classified as a toxic chemical and in high concentrations will lead
to complete respiratory arrest and almost instantaneous poisoning and death. A
person overcome by this gas should be removed immediately from the contaminated
area and given artificial respiration.
Hydrogen Sulfide (H 2S)
Exposure to lesser concentrations may result in nausea, stomach distress, belching,
and coughing. Moderate concentrations may result in eye irritation.
Industrial Applications
Mining
Also known as "stink damp," H2S is produced by the decomposition of iron pyrites in
coal mines. While flammable and considerably more deadly than carbon monoxide,
amounts of this gas are usually only trace. Proper ventilation and monitoring of this
and other gases is important in mines.
Production of thioorganic compounds
Several organo-sulfur compounds are produced using hydrogen sulfide. These
include methanethiol, ethanethiol, and thioglycolic acid.
Alkali metal sulfides
Upon combining with alkali metal bases, hydrogen sulfide converts to alkali
hydrosulfides such as sodium hydrosulfide and sodium sulfide, which are used in the
degradation of biopolymers. The depilation of hides and the delignification of pulp by
the Kraft process both are effected by alkali sulfides.
A precursor to metal sulfides
Many metal ions react with hydrogen sulfide to give the corresponding metal sulfides.
This conversion is widely exploited. For instance, gases or waters contaminated by
hydrogen sulfide can be cleaned with metal sulfides. Hydrogen sulfide is used in the
purification of metal ores by flotation, to treat mineral powders to enhance the
separation, and to passivate metal parts. Catalysts used in hydro-desulphurization
are routinely activated with H2S, and the behaviour of metallic catalysts used in other
parts of a refinery is also modified using this gas.
Heavy water production for nuclear industry
The Girdler sulfide (GS) process, also known as the Geib-Spevack (GS) process,
is an industrial production method for producing “heavy water” (deuterium oxide),
an important component in many nuclear reactors because it acts as a neutron
moderator.
Conspec Gas Facts • Hydrogen Sulfide (H 2S)
Conspec's CN Series is an economical
choice for hydrogen sulfide gas
monitoring. The CN Series is a simple
“smart” gas detector. An industry
standard 4-20 mA analog output signal.
Can be connected to any existing PLC,
DCS, or EMS system.
Specifications:
Mechanical
Enclosure
Dimensions
Weight
Mounting
Conduit Entry
Environmental
Operating
Temperature
Temperature
Compensation
Operating Humidity
Electrical
Operating Voltage
Cable Requirements
Current Consumption
Output Signal
System
Sensor Ranges
Hydrogen Sulfide
Sensor Type
Keypad
Modes
Display
Status LEDs
Alarms
NEMA 4x
4.5”x5”x4”
1 ¼ lbs.
4 holes
One (3/4” cable grip)
−4-120 F
(−20-50 C)
Full Temperature Range
10-90% RH
Non-condensing
12-24 VDC
3 Conductor
18 AWG Suggested
50 mA full-scale
Linear 4-20 mA, RS-485
(optional)
0 - 20 ppm, 0 - 50 ppm,
0-100 ppm, 0-200 ppm
Electrochemical
9-Button Infrared Remote
Control
2 (Normal & Calibration)
Two-Line, 8-Character
Alphanumeric LCD
Display
3 LEDs, 4 Status
2 User-Defined
Conspec's CX Series is an economical
choice for hydrogen sulfide gas
monitoring. The CX Series is a simple
“smart” gas detector designed for use in
hazardous or classified locations. An
industry standard 4-20 mA analog output
signal. Can be connected to any
existing PLC, DCS, or EMS system.
Specifications:
Mechanical
Enclosure
Dimensions
Weight
Mounting
Conduit Entry
Environmental
Operating
Temperature
Temperature
Compensation
Operating Humidity
Electrical
Operating Voltage
Cable Requirements
Current Consumption
Output Signal
System
Sensor Ranges
Hydrogen Sulfide
Sensor Type
Keypad
Modes
Display
Status LEDs
Alarms
Explosion Proof
UL Listed
Class 1 Div. 1 or 2
Groups B, C & D
4.5”x5”x4”
4 lbs.
Conduit-mounted
One (3/4” cable grip)
−4 F - 120 F
(−20 - 50 C)
Full Temperature Range
10 - 90% RH
Non-condensing
Conspec’s new Smart Head Gas
Monitoring System monitors, records,
and stores data; warns and advises if
replacement is needed.
Conspec’s Smart Head Single
Channel Monitor and Smart Head
Multi-Channel Controller are smarter
than your average monitors because
they are digital, yet simpler and more
reliable.
Specifications:
Mechanical
Enclosure
Dimensions
Weight
Mounting
Conduit Entry
Environmental
Operating
Temperature
Temperature
Compensation
Operating Humidity
12-24VDC
3 Conductor
18 AWG Suggested
50 mA full-scale
Linear 4-20mA, RS-485
(optional)
0-20 ppm, 0-50 ppm,
0-100 ppm, 0-200 ppm
Electrochemical
9- Button Infrared Remote
Control
2 (Normal & Calibration)
Two-Line, 8-Character
Alphanumeric LCD
Display
3 LEDs, 4 Status
2 User-Defined
Electrical
Operating Voltage
Cable Requirements
Current Consumption
Output Signal
System
Sensor Ranges
Hydrogen Sulfide
Sensor Type
Keypad
Modes
Display
Status LEDs
Alarms
NEMA 4x
7.5”x5”x3”
3 ½ lbs.
Plate-mounted, 6 holes
for suspension, grooves
for slot mounting
One (3/4” cable grip)
−4 F - 120 F
(−20 - 50 C)
Full Temperature Range
10-90% RH
Non-condensing
12-24VDC
4 Conductor
18 AWG Suggested
50 mA full-scale
RS-485; 4 Open Collector
Digital Output, Linear 4-20
mA (Single-Channel only);
HART (Optional).
0-20 ppm, 0-50 ppm,
0-100 ppm, 0-200 ppm
Electrochemical
4-Button Keypad or
Infrared Remote Control
2 (Normal & Calibration)
3.5” LCD Display
4 LEDs, 4 Status
3 User-Defined