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Address: Gas monitoring system wiring project
The wiring of gas equipment and instruments in high-purity gas pipeline projects must meet three major requirements: material compatibility, sealing and leak-proofing, and signal accuracy. The core is to ensure gas purity and system safety.
| Category | Core module | Core function | Technical highlights | Adaptation Scenario |
| Gas detection instrument accessories | Sensor probe assembly | It directly contacts the gas medium and converts the concentration signal into an electrical signal for output | Detection principle: Catalytic combustion/electrochemistry/infrared (optional) | Atmospheric environment monitoring and gas sampling in confined Spaces |
| Response time≤30s(T90) | ||||
| Lifespan: 2 to 5 years (depending on the type of sensor) | ||||
| Signal processing transmitter | Linearize the sensor signal and output a standard industrial signal | Output signal:4-20mA/RS485 | Online analysis system, front end of gas alarm controller | |
| Accuracy grade: 0.5 | ||||
| Support zero point/range self-calibration | ||||
| Control valve accessories | Pneumatic/electric actuator | Receive control signals to drive the valve to open and close, achieving gas flow/pressure regulation | Action time: 0.5-5 seconds (adjustable) | Gas transmission pipeline and reactor feed control |
| Adjustment accuracy±1%FS | ||||
| Protection grade IP67 | ||||
| Valve positioner | Precisely control the actuator stroke to enhance the valve regulation accuracy | Input signal: 4-20mA/ Fieldbus | High-precision gas proportioning system, special gas conveying pipeline | |
| Return difference≤0.5% | ||||
| Supports HART protocol communication | ||||
| Wiring engineering system | Signal transmission wiring unit | Realize bidirectional signal transmission between gas detectors, sensors and the monitoring host | Twisted-pair shielded cable (anti-interference ≥80dB | Semiconductor high-purity gas pipelines, laboratory gas distribution systems |
| The longest transmission distance 1000m(4-20mA) | ||||
| Bus/star topology | ||||
| Safety interlock control module | Interlock valves/exhaust equipment to achieve emergency shut-off and alarm output in case of gas leakage | Relay contact AC250V/10A | Chemical reactor area, LNG storage tank station, electronic specialty gas cabinet | |
| Interlock response ≤50ms | ||||
| Manual/automatic dual-mode switching | ||||
| Explosion-proof wiring assembly | Meet the wiring safety requirements in explosive gas environments | Explosion-proof grade Ex d IIB T6/Ex ia IIC T4 | Petrochemical workshop, gas boiler room, spraying operation area | |
| Flameproof junction box +IP68 cable |
| Equipment/wiring type | Core parameters | Technical indicators | Application scenarios |
| Gas source pressure reducing device | Material/Leakage rate/pressure reduction accuracy | 316L BA grade valve body, leakage rate ≤2×10⁻⁸ atm, pressure fluctuation ±0.5% after secondary pressure reduction | Terminal pressure reduction of inert gases such as nitrogen and argon |
| Specialty gas cabinet(GC) | Alarm pressure/Material/control mode | The pressure alarm threshold is 0.1-0.3MPa, the inner tube is SS316L-EP, and the PLC automatically switches the gas cylinder | Storage and transportation of highly toxic gases such as SiH₄/PH₃ |
| Gas distribution cabinet(VMB) | Number of interfaces/gas compatibility/flow range | 8-12 interfaces, compatible with corrosive gases, maximum flow rate 500L/min | Gas distribution for lithography/deposition processes |
| Welded wiring | Material/Insulation grade/temperature resistance range | 316L stainless steel sheath, FEP insulation layer, temperature resistance -60℃ to 200℃, grounding resistance of the shielding layer < 1Ω | Valve position feedback signal transmission |
| Ferrule wiring | Connection method/pressure resistance grade/leakage rate | VCR double ferrule joint, with a pressure resistance of 3000PSI and a leakage rate of ≤1×10⁻⁹ Pa·m³/s | Connection of sampling pipelines for analytical instruments |
| Gas detection sensor | Detection accuracy/response time/signal output | The oxygen sensor has an accuracy of ±1%FS, a response time of less than 10 seconds, and a 4-20mA analog signal output | Main pipe leakage monitoring and safety interlock |
| Equipment/wiring type | Core parameters | Technical indicators | Application scenarios |
| Gas source pressure reducing device | Material/Leakage rate/pressure reduction accuracy | 316L BA grade valve body, leakage rate ≤2×10⁻⁸ atm, pressure fluctuation ±0.5% after secondary pressure reduction | Terminal pressure reduction of inert gases such as nitrogen and argon |
| Specialty gas cabinet(GC) | Alarm pressure/Material/control mode | The pressure alarm threshold is 0.1-0.3MPa, the inner tube is SS316L-EP, and the PLC automatically switches the gas cylinder | Storage and transportation of highly toxic gases such as SiH₄/PH₃ |
| Gas distribution cabinet(VMB) | Number of interfaces/gas compatibility/flow range | 8-12 interfaces, compatible with corrosive gases, maximum flow rate 500L/min | Gas distribution for lithography/deposition processes |
| Welded wiring | Material/Insulation grade/temperature resistance range | 316L stainless steel sheath, FEP insulation layer, temperature resistance -60℃ to 200℃, grounding resistance of the shielding layer < 1Ω | Valve position feedback signal transmission |
| Valve position feedback signal transmission | Connection method/pressure resistance grade/leakage rate | VCR double ferrule joint, with a pressure resistance of 3000PSI and a leakage rate of ≤1×10⁻⁹ Pa·m³/s | Connection of sampling pipelines for analytical instruments |
| Gas detection sensor | Detection accuracy/response time/signal output | The oxygen sensor has an accuracy of ±1%FS, a response time of less than 10 seconds, and a 4-20mA analog signal output | Main pipe leakage monitoring and safety interlock |