Introduction To Industry Scenarios
The core of HVAC is precise temperature and humidity control, 24-hour continuous operation, energy-saving and carbon reduction, closed-loop water system, high humidity/condensate/slight corrosion, high long-term stability requirements, low maintenance, and adaptability to commercial/medical/industrial multiple scenarios.
Typical measuring points:
Chiller unit: evaporator/condenser pressure, chilled water/cooling water supply and return pressure difference, water tank level, refrigerant level
Air conditioning water system: inlet and outlet pressure of freezing/cooling water pumps, pressure of water collectors/separators, liquid level of expansion tank, liquid level of makeup tank
Cooling tower: water level inside the tower, spray water pressure, fan pressure difference
Boiler/Heat Exchanger: Steam Pressure, Hot Water Supply and Return Pressure Difference, Softened Water Tank Level, Condensed Water Recovery Level
Air handling unit (AHU): duct air pressure, filter pressure difference, condensate tray liquid level
Data center: precision air conditioning refrigerant pressure, cooling water level, cabinet microenvironment pressure difference
Adapt to Core Products
QDY30A building type input type liquid level transmitter (304 stainless steel, IP67, anti condensation water, -10 ℃~60 ℃, low power consumption, long-term stability)
QDY60 series air conditioning water specific static pressure level transmitter (anti condensation, anti slight corrosion, suitable for softened water/cooling water, zero drift ≤ 0.1% FS/year)
QDW90A-3051 air conditioning system flange liquid level transmitter (compact, threaded installation, expansion tank/condensate tray specific, maintenance free)
QDKG building grade intelligent pressure/differential pressure transmitter (0.1 level, wide range, micro/low pressure adaptation, anti vibration, water/steam/air universal, PID closed-loop adaptation)
GLG Building Automation Anti Interference Signal Isolator (2500V isolation, anti frequency converter/fan interference, long-distance transmission, EMC certification)
S803/SS803 compact digital instrument for buildings (IP65, wall/panel installation, local display/alarm, compatible with machine room/pipeline well)
Product Function
QDY30A/QDY60+QDW90A-3051 liquid level category (water tank/condensate/expansion tank)
Expansion tank/water replenishment tank liquid level: anti condensation, long-term stability, real-time monitoring of liquid level, automatic water replenishment/shutdown, maintaining system constant pressure, preventing water hammer/water shortage shutdown, ensuring closed-loop stability of air conditioning water system, reducing manual inspections.
Liquid level of condensate tray (AHU/precision air conditioner): anti overflow, high reliability, monitoring condensate liquid level, full liquid level alarm/linked drainage pump, preventing overflow from soaking the ceiling/machine room, avoiding electrical short circuits, and reducing operation and maintenance risks.
Cooling tower/softened water tank liquid level: corrosion-resistant and temperature resistant, controlling the water level within a reasonable range to ensure cooling efficiency, reduce water replenishment waste, prevent scaling, and extend equipment life.
QDKG pressure/differential pressure transmitter (water system/air system/unit)
Cold/cooling water supply and return pressure difference: high-precision, micro pressure adaptation, real-time monitoring of pressure difference, linkage with frequency converter to adjust water pump speed, achieving variable flow energy-saving, maintaining hydraulic balance, avoiding energy waste, and saving 20% -30% energy.
Pressure of chiller evaporator/condenser: anti vibration, wide temperature range, precise monitoring of refrigerant pressure, warning of high/low pressure faults, protecting compressors, avoiding unit shutdown, and extending the life of core components.
Air duct/filter differential pressure (AHU): Micro pressure type, fast response, monitors the pressure difference before and after the filter, determines the degree of blockage, reminds replacement, ensures ventilation efficiency, avoids energy consumption increase, and improves indoor air quality.
Boiler/heat exchange station steam/hot water pressure: resistant to temperature, stable pressure, controlled pressure stability, ensuring heating/hot water temperature meets standards, avoiding overpressure safety hazards, and improving heat exchange efficiency.
GLG Building Isolator (Strong Interference/Long Distance)
HVAC frequency converter/fan interference: 2500V isolation, common mode rejection ≥ 60dB, suppression of peak interference, stable signal without jumping, no false alarms/actions, ensuring continuous system operation, and accurate data uploading to BAS.
Long distance transmission in computer rooms/pipeline wells: RS485+Modbus, signal attenuation free, wiring saving, real-time data synchronization with central control, support for remote monitoring and energy-saving strategy optimization.
S803/SS803 Building Digital Display Instrument (Local/Machine Room)
On site display of computer room/pipeline well: IP65 dustproof and waterproof, compact in size, easy to read during inspection, free from entering damp/narrow areas, safe and efficient, suitable for concealed environments in buildings.
Over limit alarm/interlock: relay output, linked sound and light alarm, emergency stop/valve closing, 1-second response, anti overflow/overpressure/water shortage accidents.
Data upload/energy consumption statistics: Modbus communication, connected to BAS system, energy/water consumption statistics, fault tracing, supporting building energy efficiency audit and management.
Addressing Industry Issues
Uncontrolled liquid level in the water system, frequent overflow/shortage of water
Ordinary level gauges are prone to condensation/corrosion, large drift, resulting in water immersion, electrical short circuit, water shortage shutdown, and high maintenance costs.
Hydraulic imbalance, high energy consumption, unstable temperature control
Low manual adjustment accuracy, lag, large pressure difference fluctuations, high energy consumption of water pumps, uneven room heating and cooling, poor comfort.
Filter blockage, poor ventilation, and increased energy consumption
Failure to conduct timely manual inspections and low efficiency can lead to increased air resistance, skyrocketing fan power consumption, and decreased indoor air quality after blockage.
Condensed water overflow poses high operational risks
Ordinary liquid level switches have poor reliability, false alarms/omissions, overflow can damage ceilings/equipment, cause electrical leakage accidents, and damage brand image.
Strong electromagnetic interference, signal jumping and false alarm
Frequency converter/fan interferes with BAS signal drift, false interlocking, system instability, affecting continuous operation and increasing manual intervention costs.
High maintenance costs and low efficiency of manual inspections
Buildings are widely distributed and have multiple locations, making manual inspections time-consuming and laborious, with data lag and delayed fault detection.
Direct Customer Benefits
Energy saving and carbon reduction benefits (core)
Variable flow control: Energy consumption of water pumps/fans is reduced by 25% -35%, annual energy savings of 100000 square meters of commercial buildings are ≥ 1.2 million kWh, and electricity savings are ≥ 960000 yuan.
Hydraulic balance: The temperature control accuracy has been improved to ± 0.5 ℃, the room comfort compliance rate is 100%, and customer satisfaction has been increased.
Filter intelligent reminder: The energy consumption of the fan is reduced by 8% -12%, the annual power saving is ≥ 300000 kWh, and the electricity cost is ≥ 240000 yuan.
Equipment reliability and lifespan benefits
Accurate monitoring of pressure/liquid level: The failure rate of chiller/water pump has been reduced by ≥ 90%, unplanned shutdowns have been reduced by ≥ 95%, and annual losses from shutdowns have been avoided by ≥ 800000 yuan.
Anti overflow protection: Reduce overflow accidents by 100%, avoid damage to suspended ceilings/equipment, and reduce maintenance costs by ≥ 300000 yuan per year.
High reliability and long lifespan: The instrument has a lifespan of 3-5 years, is maintenance free, reduces annual maintenance costs by ≥ 80%, and reduces labor/spare parts expenses by ≥ 200000 yuan.
Operation and maintenance efficiency and labor cost benefits
Automatic monitoring/alarm: manual inspection reduced by ≥ 85%, saving labor costs of ≥ 400000 yuan per year for a 100000 square meter building.
Remote monitoring: The fault response time has been shortened to 5 minutes, the operation and maintenance efficiency has been improved by ≥ 70%, and the risk of working in high-altitude/narrow areas has been reduced.
Compliance and management benefits
Accurate and traceable data: meets the requirements of green building/energy audit, with real and traceable energy consumption data, helping with building rating.
Safety compliance: Avoid overpressure/overflow safety accidents, comply with fire/mechanical and electrical regulations, and reduce operational risks.
