Hydrogen sulfide is a colorless, rotten egg-smelling toxic gas. When the volume fraction of hydrogen sulfide in the air exceeds 0.1%, it can cause headache and dizziness and other poisoning symptoms, so the preparation or use of hydrogen sulfide must be carried out in a fume hood.
1. Physicochemical properties of hydrogen sulfide:
Chemical formula: H2S. Formula Quantity 34.08. Density 1.539 g/l Melting point -85.5°C, boiling point -60.7°C.
Toxic, foul-smelling colorless gas. In industrial production, the content of H2S in the air is required to not exceed 0.01 mg/L. H2S is slightly soluble in water, and its aqueous solution is called hydrosulfuric acid. It is chemically unstable and can burn in air when ignited, and has reducing properties. It can make the surface of silver and copper products blacken. Interact with many metal ions to form sulfide prediits that are insoluble in water or acids. It reacts with many nonmetals to form free sulfur.
2. Existence of hydrogen sulfide:
It can be made by the direct compounding of sulfur vapor and hydrogen; It can also be prepared by the homotic action of metal sulfides. H2S can be used to separate and identify metal ions, refine hydrochloric acid and sulfuric acid (remove heavy metal ions), and prepare elemental sulfur. It is a good reducing agent.
Hydrogen sulfide is rarely used in industrial production, generally as a product of certain chemical reactions and natural protein decomposition processes, as well as as a component and impurity of certain natural products, and is often found in a variety of production processes and in nature. Such as mining and non-ferrous metal smelting. Hydrogen sulfide is produced in low-temperature coking, sulfur-containing oil mining and refining, rubber, tanning, dye, sugar and other industries. Excavation and remediation of swamps, ditches, printing and dyeing, sewers, tunnels, and removal of garbage and manure, as well as natural gas, volcanic fumes, and mineral springs, are also often accompanied by hydrogen sulfide.
3. Harm to the human body and its dangerous characteristics
When the air contains 0.1% H2S, it will cause people to have headaches and dizziness. When large amounts of H2S are inhaled, it can cause coma and even death. Excessive contact with H2S can cause chronic poisoning, worsen feelings, headaches, weight loss, etc. In industrial production, the content of H2S in the air is required to not exceed 0.01 mg/L.
It is flammable and can form an explosive mixture when mixed with air, and can cause combustion and explosion when exposed to open flame and high heat. Violent reaction with concentrated nitric acid, fuming sulfuric acid or other strong oxidizing agents, explosion. The gas is heavier than air and can diffuse to a considerable distance at a lower place, causing backfire in the event of an open flame.
4. Detection of hydrogen sulfide leakage
1In order to prevent the leakage of the tiny content of hydrogen sulfide, which causes safety accidents,
Suggested use:
Antai Jihua Hydrogen Sulfide Testing Equipment:
JHAT-FM-H2S (hydrogen sulfide detection probe,transmitter)+ AT-1/2/4/8(Alarm Control Host)
JHAT-FS-H2S (hydrogen sulfide detection probe,transmitter)+ AT-1/2/4/8(alarm control host),This model transmitter has a live display.
Used to monitor hydrogen sulfide preparation workshops, storage rooms, and other premises.
2If there are many release sources or large areas that need to be detected, (more than 8.)dots), please select:Beijing Antai Jihua
Bus-based hydrogen sulfide detection probe/transmitterJHAT-FZ-H2S。 See the table above for specific parameters:
and JHAT-FM-H2SThe advantages are: simple installation, saving wiring costs, and easy unified control.
3、 For places that need on-line testing all the time, you can choose the portablehydrogen sulfide detection alarm (JHAT-FH-H2S)。
4、 The specific parameters are as follows:
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transmitter name
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hydrogen sulfide gas transmitter
(Analog output type)
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hydrogen sulfide gas transmitter
(Switching output type)
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hydrogen sulfide gas transmitter
(Digital Display)
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hydrogen sulfidetransmitter
(Bus system)
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How it works:
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electrochemical
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Semiconductors
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electrochemical
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electrochemical
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Detection range
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0-100/200ppm
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10-50ppm
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0-100/200ppm
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0-100/200ppm
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Default alarm point
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10；20
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10；20
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10；20
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10；20
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Output signal
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4-20mA standard signal output
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Switching output
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4-20mA standard signal output; Switching output
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RS485
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Connect the cable
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2-core shielded cable
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Four-core shielded cable
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3-core shielded cable
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4-core shielded cable
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Explosion protection
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Ex d IIC T6
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Ex d IIC T6
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Ex d IIC T6
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Ex d IIC T6
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Ingress protection
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IP66
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IP66
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IP66
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IP66
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Power supply
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24V DC
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24V DC
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24V DC
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24V DC
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5、The host parameters are as follows:
Working Voltage: 220V AC;
Control output: switching contact output 220VAC, 2A;
Temperature and humidity range: 0~70°C; 10~90% RH (non-condensing);
Accuracy: 0.2%F.s (0.5%F.s for a single channel)
Installation method: wall mounting
Weight: approx. 1.2 kg (single/dual channel), 3kg (multi-channel)
6、 Product selection table:
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Purpose of the test
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Scenario type
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Probe model:
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Product Introduction
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1
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Monitor trace leaks of gas online at all times
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Typical scheme
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JHAT-FM-H2S
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4-20mA output, which can display the concentration value on the main unit. Alarm points are arbitrarily set on the host (PLC), and two-level/multi-level alarms are set up.
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