Principles of Hengold Instruments Hydrogen Sulfide Detector Application Field
Hydrogen sulfide detection with sound and light alarm integrated machine is suitable for continuous online detection of hydrogen sulfide concentration and on-site sound and light alarm in various industrial environments and special environments, which plays an early warning role for the safety of hazardous site operations. Microcontroller technology has the advantages of stable signal, high precision and good repeatability. The explosion-proof wiring method is suitable for various dangerous places. The instrument is compatible with various control alarms, PLC, DCS and other control systems, and can realize on-site alarm and remote monitoring and alarm functions at the same time.
description
The semiconductor technology hydrogen sulfide gas detector is designed to monitor the concentration of hydrogen sulfide gas in the ambient air,
Its measuring range is from 0-20 / 50 / 100ppm of standard type (adjustable on the job site) to 10,000ppm of high measuring range type. The product uses solid metal oxide semiconductor sensing technology. The sensor consists of two sheets: one is a heating sheet and the other is a gas-sensitive sheet sensitive to hydrogen sulfide gas. Both sheets are mounted on a silicon chip by vacuum coating. The heating sheet raises the working temperature of the gas-sensitive sheet to a level that can react with hydrogen sulfide gas. There are metal oxides on the gas-sensitive film, which can dynamically display the change of hydrogen sulfide gas concentration. Its sensitivity can range from one part per billion to one percent. This product is sturdy and durable and can maintain stable operation for more than ten years in most industrial environments.
Features
l Sturdy and durable, strong resistance to bad weather
l Long service life
l The longest warranty period of hydrogen sulfide gas detector in the world
l Low cost of replacement and maintenance
l Not affected by prolonged exposure to hydrogen sulfide
Application field
Where are solid oxide semiconductor hydrogen sulfide detectors most suitable?
Bad weather
l Desert and high temperature areas
l Sub-zero environment
l Tropical and subtropical humid environment
Harsh environment
l Ocean operation
l Oil and gas drilling operations
l Where hydrogen sulfide gas often appears
Establish a system solution
The hydrogen sulfide sensor provides users with many output signal selection options. Multi-channel controllers are based on microprocessors, programmable logic controllers, and microcomputers, and can be applied to any system and network. The following are some typical system establishment solutions.
l 4-20mA
The sensor directly feeds back the 4-20mA signal to the multi-channel controller. The controller repeatedly displays these signals and also provides spare relays and RS-485 output.
l 4-20mA plus local relay
The 4-20mA signal directly fed back to the multi-channel controller and the output signal of the relay together trigger an alarm or other reaction equipment. The controller also provides spare relays and RS-485 output.
l RS-485 communication plus local relay
The sensors are connected via the RS-485 communication bus to trigger an alarm or other reaction device together with the output signal of the relay. The programmable logic controller provides all data processing, display and history records.
l 4-20mA plus RS-485 communication bus
The 4-20mA signal of the sensor is imported into the DA-1 data module to be converted into a signal that RS-485 can process. The DA-1 data module feeds the data back to the 880 programmable logic controller. The controller provides all data processing, display and historical records. The programmable logic controller can be further connected to the computer via a human-machine communication interface through Citect, Wonderware or other software.
working principle
Changchun Yiyang series gas detectors use imported original ampere-type electrochemical sensors, usually composed of three electrodes immersed in the electrolyte. The working electrode is made of a catalytically active metal, which is coated on a breathable but hydrophobic membrane. The measured gas diffuses through the porous membrane and undergoes an electrochemical oxidation or reduction reaction on it. The nature of the reaction depends on the thermodynamic potential of the working electrode and the electrochemical (oxidation or reduction) nature of the analysis gas. In the electrochemical reaction, the electrons participating in the reaction flow into (reduction) or flow out (oxidation) of the working electrode. The working signal of the working electrode is amplified by the operational amplifier U2 to become the output signal of the instrument. The circuit also maintains the voltage of the working electrode at its bias voltage VBIAS. The reference electrode provides a stable potential for the working electrode in the electrolyte. After the reference electrode potential is compared with VBIAS, the output voltage signal of the op amp U1 is exactly the size of a current signal that is equal to the working electrode. At the same time, the circuit maintains a constant potential difference between the working electrode and the reference electrode. The measuring electrode is only the second electrode required for a complete electrochemical sensor, and its main function is to allow electrons to enter or flow out of the electrolyte.
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