Introduction To Industry Scenarios
The core of sewage treatment is water inlet → grid → sedimentation → regulating tank → biochemical (aeration/anaerobic) → sedimentation → deep treatment (filtration/disinfection) → effluent/reuse. The medium contains suspended solids, sediment, oil pollution, acid and alkali, corrosive ions, sludge, and the environment is humid, corrosive, with a lot of sludge, strong vibration, and interference from frequency converters.
Typical measuring points:
Grid well/inlet pump room: inlet liquid level, channel width liquid level, pump outlet pressure, overload alarm
Regulating tank/accident tank: sewage level, high/low level interlock, acid-base level
Aeration tank/oxidation ditch: liquid level, aeration air pressure, dissolved oxygen (matching), reflux sludge liquid level
Sedimentation tank/secondary sedimentation tank: mud water interface, supernatant liquid level, sludge discharge valve pressure
Sludge concentration tank/storage tank: sludge level, sludge level, sludge pump pressure
Dosing room: liquid level of dosing tank (PAC/PAM/acid-base), pressure of dosing pump
Water outlet/discharge outlet: water level, flow weir level, discharge pressure
Explosion proof area: anaerobic tank, biogas tank, dosing room (anti-corrosion/explosion-proof)
Adapt to Core Products
QDY30A immersion type liquid level transmitter (anti blocking/anti-corrosion/IP68): 316L/PVDF, anti silt blocking, long-term immersion
QDY60 series static pressure liquid level transmitter (large diameter/anti sediment): wide range, anti suspended solids, strong stability
QDW90A-3051 single flange liquid level transmitter (sludge/viscous medium): flat diaphragm, anti adhesion, easy to clean
QDKG intelligent pressure switch/transmitter (waterproof/anti-corrosion/micro pressure): 316L, micro pressure/negative pressure, pump control dedicated
GLG signal isolator/RS485 isolator (moisture/interference resistant): 2500V isolation, common mode rejection, long-distance transmission
S803/SS803 intelligent digital display instrument (waterproof/outdoor/corrosion-resistant): IP65, stainless steel shell, local display/alarm
Product Function
QDY30A/QDY60 liquid level class (sewage tank/channel)
Regulating pool/inlet channel liquid level: 0.2 level accuracy, IP68 long-term immersion, anti blocking guide hole, real-time monitoring of water level, linkage of inlet pump frequency conversion/start stop, achieving constant water level control, anti overflow, anti dry pumping, stabilizing inlet load, and protecting water pump.
Liquid level of aeration tank/oxidation ditch: anti foam, anti vibration, maintain the process set liquid level, ensure the aeration/mixing efficiency, prevent the overflow of high liquid level and idling of low aerator.
Sludge level of sludge tank/concentration tank: QDW90A flat membrane prevents sludge adhesion, accurately measures sludge level, links sludge discharge pump/valve, automatically discharges sludge, and prevents sludge clogging/blockage of pipelines.
Liquid level of medication tank/acid-base tank: PVDF anti-corrosion probe, monitoring medication inventory, linked dosing pump automatic replenishment, low liquid level alarm, ensuring stable dosing and avoiding medication interruption/waste.
QDKG pressure switch/transmitter (pump/pipeline/air pressure)
Pump inlet and outlet pressure: 0.075 level, waterproof and moisture-proof, monitoring pump pressure/head, determining idling/blockage/overload, automatic protection, fault warning, extending pump life.
Aeration fan air pressure: micro pressure type, anti vibration, real-time monitoring of aeration pressure, linked fan frequency conversion, stable dissolved oxygen, energy saving and consumption reduction, and prevention of fan surge.
Pipeline/valve group pressure: anti-corrosion diaphragm, monitoring pipeline network pressure, preventing blockage, overpressure explosion, and water leakage warning.
GLG signal isolator/RS485 isolator (strong interference/long-distance)
Frequency converter/fan/pump group interference: 2500V isolation, common mode rejection ratio ≥ 60dB, cutting off ground loop, suppressing surge/peak interference, DCS signal stability, no drift/jump, no false interlocking.
Long distance signal in the factory (within 500m): RS485+Modbus, signal attenuation free, packet loss rate<0.1%, central control and on-site data synchronization, reliable traceability.
S803/SS803 digital display instrument (on-site/outdoor)
On site display: IP65, high brightness LED, moisture and corrosion resistance, visual inspection reading, no climbing pool, no opening cover, safe and efficient.
High and low liquid level/pressure alarm: relay output, linked sound and light alarm, emergency stop/valve closing, 1-second response, preventing the expansion of accidents.
Data upload/accumulation: Modbus communication, connected to central control SCADA, energy consumption statistics, drug consumption analysis, effluent data traceability, meeting environmental supervision requirements.
Addressing Industry Issues
The liquid level is out of control, overflow/dry pumping occurs frequently
Water inflow fluctuates greatly, manual regulation lags behind, the overflow of the regulating pool pollutes the environment, dry pumping burns the pump, and a single loss of tens of thousands of yuan+environmental penalty.
Difficulty and easy blockage in measuring sludge/viscous media
Ordinary probes hang sludge, clog, drift greatly, inaccurate sludge position leads to uncontrolled sludge discharge, sludge expansion, and excessive effluent.
Corrosive and humid environment, short lifespan of instruments
Acid alkali/moisture corrosion, ordinary instruments malfunction within 3-6 months, frequent replacement, high maintenance costs, and affect continuous operation.
Strong electromagnetic interference and unstable signal
Interference from frequency converters/fans, DCS jumping, false alarms, false interlocks, process fluctuations, and unstable effluent quality.
Multiple manual inspections, low efficiency, and high safety risks
pool depth/toxicity/slippery, low efficiency of manual liquid level/meter reading, easy to fall into the pool/poisoning, inaccurate data.
High energy consumption, high drug consumption, and high operating costs
Constant speed of pumps/fans, experience based dosing, high energy/drug waste, and high cost per ton of water.
Direct Customer Benefits
Safety and environmental benefits (core)
Prevent overflow/dry pumping: eliminate sewage overflow, reduce environmental accident rate by 100%, and avoid fines of 100000 to 500000 yuan per incident; The lifespan of the water pump is extended by 2 times, and the annual equipment loss is reduced by ≥ 200000 yuan.
Accurate sludge position: controllable sludge discharge, reduced sludge expansion/effluent over standard rate by ≥ 90%, stable compliance, and reduced environmental inspection risks.
Stable operation and quality benefits
Signal stability: DCS misoperation reduced by ≥ 98%, process fluctuations reduced, effluent COD/ammonia nitrogen stable compliance rate ≥ 99.5%.
Continuous operation: instrument failure rate reduced by ≥ 70%, unplanned downtime reduced, and effective operating time increased by ≥ 15 days per year.
Energy saving and consumption reducing benefits (direct savings)
Pump/fan frequency conversion: power consumption reduced by 15% -25%, annual power saving of ≥ 300000 kWh in a 10000 ton sewage plant, and electricity cost savings of ≥ 240000 yuan.
Precise dosing: Reduce drug consumption by 10% -20%, and save annual drug costs of at least 150000 yuan for a 10000 ton sewage treatment plant.
Maintenance and labor benefits
Long maintenance free cycle: The lifespan of the instrument is 2-3 years, with an annual maintenance cost reduction of ≥ 60% and a reduction of spare parts/labor expenses of ≥ 100000 yuan.
Improved inspection efficiency: on-site display+remote monitoring, reducing manual inspections by ≥ 70%, saving labor costs of ≥ 80000 yuan per year.
Management and compliance benefits
Data traceability: meets the requirements of online environmental monitoring and auditing, the data is authentic and cannot be tampered with, and has successfully passed environmental inspections.
Intelligent improvement: The degree of unmanned operation has been increased, and the management efficiency has been improved by ≥ 50%, making it suitable for the construction of smart sewage treatment plants.
