Introduction To Industry Scenarios
The core of subway/intercity railway is underground space+high-density pedestrian flow+all-weather operation. Working conditions: underground humidity, high risk of water accumulation, dust, strong stray current, high electromagnetic interference, closed civil air defense, dense equipment, 24-hour uninterrupted operation.
Typical measuring points:
Station/Tunnel: Collecting well/wastewater tank liquid level, pump room pressure, tunnel drainage ditch liquid level, civil air defense door sealing pressure
Vehicle depot/parking lot: Rainwater tank/sewage tank level, car wash water circulation water pressure, fire water tank level
Power supply station/traction substation: cooling water tank level, transformer oil level, gas pressure, fire pipe network pressure
Ventilation/air conditioning: condensate drainage level, duct pressure, fan pressure difference
Fire protection/water supply and drainage: fire water tank/water tank level, sprinkler pipe network pressure, fire hydrant pressure, domestic water pump pressure
Adapt to Core Products
QDY30A subway specific input type liquid level transmitter (IP68, anti silt, anti stray current, -20 ℃~60 ℃, 316L)
QDY60 series large-diameter static pressure liquid level transmitter (wide range, anti sewage/sludge, long-term immersion, specialized for tunnel collection wells)
QDW90A-3051 single flange liquid level transmitter (closed water tank/civil air defense area, anti condensation, flat membrane anti blocking)
QDKG intelligent pressure switch/transmitter (waterproof IP67, anti vibration, micro/high pressure, fire/water pump specific)
GLG stray current isolation type signal isolator/RS485 (resistant to DC stray current, frequency converter interference, long-distance tunnel transmission）
S803/SS803 underground digital display instrument (IP65, moisture-proof condensation, stainless steel shell, local alarm, tunnel wall mounted)
Product Function
QDY30A/QDY60 liquid level class (collection well/wastewater tank/fire water tank)
Tunnel/station water collection well liquid level: IP68 long-term immersion, anti silt blockage, anti stray current, real-time monitoring of accumulated water level, automatic start stop/frequency conversion of linked drainage pump, anti waterlogging of tunnel, anti backflow, ensuring driving safety, and preventing shutdown accidents.
Fire water pool/tank liquid level: 316L anti-corrosion, high stability, monitoring of fire water inventory, automatic replenishment at low liquid level, overflow alarm at high liquid level, ensuring sufficient water supply and compliance acceptance in case of fire.
Rainwater/sewage tank level in the vehicle depot: resistant to oil pollution/suspended solids, automatic drainage during rainy season, anti overflow of accumulated water, and protection of equipment and tracks in the vehicle depot.
Liquid level of closed water tank in civil air defense area: QDW90A flat membrane anti condensation, monitoring the closed water level to ensure the sealing of civil air defense doors and waterproof penetration during wartime.
QDKG pressure switch/transmitter (water pump/fire/pipe network)
Drainage pump inlet and outlet pressure: waterproof, anti vibration, micro pressure type, monitoring pump pressure/head, determining idling/blockage/overload, automatic protection, fault warning, extending pump life, reducing emergency repairs.
Fire sprinkler/hydrant pipe network pressure: high-precision, long-term stable pressure, real-time monitoring of fire pressure, prevention of overpressure explosion, prevention of low-pressure fire extinguishing failure, meeting fire safety regulations and ensuring passenger safety.
Air conditioning condensate drainage pressure: micro pressure type, monitoring drainage smoothness, preventing condensate backflow and damage to electrical equipment.
Cooling system pressure of traction substation: high voltage type, anti-interference, monitoring transformer cooling water pressure, preventing water interruption and overheating, protecting power supply equipment, and ensuring train operation.
GLG stray current isolator/RS485 (strong tunnel interference/long-distance)
Tunnel stray current+frequency converter interference: 2500V isolation, anti DC stray current, common mode suppression ≥ 60dB, cutting off the ground loop, suppressing stray current and peak interference, DCS signal stability, no drift/jump, no false interlocking, ensuring driving and signal safety.
Long distance signal for tunnels (1-2km): RS485+Modbus, signal attenuation free, packet loss rate<0.1%, real-time synchronization and reliable traceability of data between the central control and tunnel pump room.
S803/SS803 underground digital display instrument (on-site/tunnel wall mounted)
On site display of tunnel/pump room: IP65 moisture-proof condensation, high brightness LED, anti dust, intuitive reading for inspection, no need to enter the well/water accumulation area, safe and efficient.
Liquid level/pressure over limit alarm: relay output, linked sound and light alarm, emergency drainage/valve closing, 1-second response, prevent water accumulation from expanding, and avoid shutdown.
Data upload/accumulation: Modbus communication, connected to the subway comprehensive monitoring ISCS, energy/water consumption statistics, fault tracing, to meet the requirements of smart subway operation and maintenance.
Addressing Industry Issues
The risk of underground water accumulation is extremely high, and tunnels that are prone to flooding are shut down. During the rainy season, water accumulation occurs quickly due to leakage, and artificial drainage lags behind. Water accumulation can flood the tracks and cause train shutdowns, resulting in losses of tens of millions of yuan per shutdown and significant social impact.
Stray current+strong electromagnetic interference, signal jumping
DC traction stray current, frequency converter/fan interference, DCS false alarm, false interlock, drainage pump false start stop, affecting driving safety.
Underground moisture condensation and instrument vulnerability
High humidity+dust, ordinary instruments may experience corrosion/short circuit faults for 3-6 months, frequent replacement, and affect continuous operation.
The compliance pressure for fire protection/water supply and drainage is high
If the fire liquid level/pressure does not meet the standard and fails to pass the acceptance inspection, fines will be imposed and rectification will be carried out, which will affect the opening and operation.
Manual inspection is dangerous and inefficient
Tunnel water accumulation/darkness/narrowness, high risk, low efficiency, data lag, and untimely drainage of manual underground inspection.
High energy consumption and high maintenance costs
The drainage pump operates at a constant speed without intelligent control, resulting in high power consumption, short pump lifespan, and high maintenance costs.
Direct Customer Benefits
Security and operational revenue (core, guaranteed activation/operation)
Real time monitoring of water accumulation+automatic drainage: tunnel water accumulation accidents are reduced by 100%, preventing shutdowns and avoiding annual shutdowns with losses of ≥ 5 million yuan.
Fire compliance: The fire liquid level/pressure meets 100% standards and has successfully passed the fire inspection, avoiding fines and rectification.
Signal stability: DCS misoperation reduced by ≥ 98%, and the risk of driving safety accidents reduced by ≥ 95%.
Stable operation and equipment lifespan benefits
High reliability of instruments: The service life of underground humid environments is 2-3 years, with a failure rate reduction of ≥ 70% and a reduction in unplanned shutdowns.
Intelligent protection of water pump: The lifespan of the water pump is extended by 2 times, and the annual cost of equipment replacement is reduced by ≥ 300000 yuan.
Energy saving and consumption reducing benefits (direct savings)
Variable frequency linkage of drainage pump: power consumption reduced by 20% -30%, annual power saving of single line subway ≥ 500000 kWh, and electricity cost savings ≥ 400000 yuan.
Maintenance and labor benefits
Long maintenance free period: Annual maintenance costs reduced by ≥ 60%, spare parts/labor expenses reduced by ≥ 200000 yuan.
Unmanned operation: Reduce manual inspections by ≥ 80%, save labor costs of ≥ 150000 yuan per year, and eliminate operational risks in tunnel water accumulation areas.
Management and smart subway revenue
Data Traceability: Connected to the ISCS system, real-time and transparent operation and maintenance data is achieved, and management efficiency is improved by ≥ 50%.
Intelligent upgrade: meets the requirements of smart subway construction, remote monitoring/scheduling, and fine operation and maintenance.
