<span>Xuyangqidian / Qidian Automation</span> Hydrostatic Level Sensors & Instrumentation

Industrial hydrostatic liquid level sensors and process instrumentation by Xuyangqidian / Qidian Automation: series QDY30B, QDY30A, QDY60A, QDY70A, QD3051, and QD-6011.

Submersible hydrostatic liquid level sensors QDY30B

Submersible hydrostatic liquid level sensors QDY30B feature an imported diffused silicon piezoresistive element enclosed within an IP68 stainless steel housing. The transmitters measure fluid head in open tanks, deep boreholes, wastewater sumps, and industrial reservoirs.

Hydrostatic measurement span options from 0.5 up to 50 meters of water column depth
Standard analog 4-20 mA current loop output and digital RS-485 Modbus RTU interface
Heavy-duty PUR cable with built-in atmospheric vent capillary for barometric balance
Removable front protective cap preventing sediment buildup over the sensing diaphragm

Submersible hydrostatic level transmitters series QDY30A

Industrial hydrostatic level transmitters series QDY30A provide continuous depth measurement in potable water, cooling towers, and industrial effluent basins. The 316L stainless steel submersible probe provides stable zero-point performance and high long-term precision.

Precision isolating sensing diaphragm fabricated from 316L stainless steel alloy
Overall hydrostatic pressure measurement accuracy rating within 0.5 percent full scale
Internal temperature compensation across operating ambient limits from -20 to +80 C
Hermetic cable gland entry engineered for continuous submersion to IP68 standards

Slim borehole hydrostatic level transmitters series QDY60A

Slim borehole hydrostatic level transmitters QDY60A feature a reduced probe outer diameter for installation in narrow well drillings and piezometer tubes. The reinforced suspension cable withstands high tensile pull loads during deep submersible deployment.

Compact 19 mm outer probe diameter designed for smooth descent into narrow boreholes
Reinforced cable jacket integrated with high-tensile strength support cord members
Built-in transient surge suppression protecting internal circuits against surges
Direct interface compatibility with programmable logic controllers and remote RTUs

Submersible liquid level sensors for harsh media QDY70A

Corrosion-resistant liquid level sensors series QDY70A are engineered for monitoring level columns in acids, chemical reagents, and industrial wastewater tanks. PTFE or PVDF polymer probe housings with ceramic diaphragms prevent chemical deterioration.

Chemical-grade polymer probe housing machined from fluoropolymer PTFE or PVDF alloy
Rugged ceramic capacitive sensing diaphragm resilient against abrasive slurries
Inert fluoroplastic cable jacket engineered for immersion in acidic solutions
Ideal solution for electroplating plants, chemical storage, and neutralization sumps

Industrial pressure and level transmitters series QD3051

Smart pressure and hydrostatic level transmitters series QD3051 utilize a monocrystalline silicon sensor with high long-term stability. The instruments are configured with direct or remote flange diaphragm seals for chemical reactors and process vessels.

Monocrystalline silicon sensor core providing reference accuracy up to 0.075 percent
Flange mounting diaphragm seals fabricated from 316L stainless steel or Hastelloy
Digital HART communication protocol superimposed over standard 4-20 mA current loop
Rugged dual-compartment terminal enclosure featuring an integrated backlit display

Isolated safety barriers and instrumentation modules QD-6011

Galvanic isolators and intrinsic safety barriers series QD-6011 provide explosion protection for Ex ia IIC loops when routing 4-20 mA signals from field level sensors to PLCs. The compact DIN-rail module provides three-port isolation between input, output, and power circuits.

Intrinsic safety barrier rating Ex ia IIC engineered for hazardous area zones 0, 1, 2
Three-port galvanic isolation up to 1500 V between power, field input, and output
Slim 12.5 mm enclosure profile engineered for high-density DIN-rail cabinet mounting
Integrated front LED status indicators displaying active power and loop continuity

Hydrostatic liquid level measurement operating principles in QDY30B

Submersible hydrostatic level transmitters Xuyangqidian / Qidian Automation QDY30B operate by continuously monitoring the hydrostatic pressure head exerted by the liquid column above the sensing diaphragm.

A piezoresistive silicon bridge, isolated behind an alloy 316L stainless steel diaphragm, experiences deflection proportional to fluid depth and generates an analog electrical potential.

Integrated electronics condition the signal into a standard 4-20 mA current loop or transmit digital readings over RS-485 Modbus RTU. Hermetic cable gland sealing prevents moisture ingress during continuous submersion in deep industrial reservoirs.

Atmospheric barometric pressure balance via cable vent capillary

High accuracy across varying weather patterns is achieved through an integrated atmospheric compensation system. The heavy-duty polyurethane cable incorporates a continuous internal vent tube fitted with a hydrophobic microporous breathing filter at the surface termination.

This capillary references barometric ambient pressure shifts to the backside of the silicon piezoresistive element, neutralizing weather-induced atmospheric deviations.

Technicians must avoid crimping the cable line during deployment, and terminal junction boxes should include silica desiccant capsules.

Deployment techniques in deep boreholes and narrow piezometer tubes

Installing slimline level transmitters Xuyangqidian QDY60A requires proper mechanical isolation against fluid turbulence and physical wall abrasion. The compact 19 mm probe diameter enables smooth descent down narrow piezometer pipes and borehole drillings without snagging.

To shield the sensing face from turbulent flow during well pump start cycles, the probe is installed inside slotted stilling pipes or anchored via stainless steel suspension wire. High-tensile strength support cords inside the cable jacket absorb longitudinal pull loads during vertical hanging.

Corrosion-resistant liquid level monitoring in aggressive chemical sumps

For continuous depth gauging in acids, electroplating baths, and chemical effluent sumps, Xuyangqidian QDY70A transmitters utilize specialized anti-corrosion polymers. The sensor body is precision-machined from fluoropolymer PTFE or PVDF alloy to withstand direct chemical attack.

The dry ceramic capacitive sensing diaphragm Al2O3 delivers exceptional mechanical hardness and abrasion resistance against gritty slurries. The fluoroplastic jacketed cable maintains flexibility and hermetic isolation when immersed in corrosive electrolytes.

System integration with industrial PLC controllers and telemetry networks

Xuyangqidian hydrostatic sensors connect smoothly with telemetry RTUs, pump station automation panels, and plant-wide supervisory control systems.

Two-wire 4-20 mA analog outputs run on 24 V DC loop power, minimizing wiring overhead while providing high immunity to industrial electrical interference along extended runs.

Alternatively, digital models equipped with RS-485 Modbus RTU allow multi-drop networking of up to 32 nodes on a single serial bus, transmitting depth values, process temperature, and diagnostic flags directly to digital control networks.

Intrinsic safety barrier configurations for hazardous process zones

Hazardous industrial locations such as sewage treatment facilities and wastewater processing plants demand strict electrical protection. Field level transmitters installed in explosive atmospheres are coupled with QD-6011 intrinsic safety barriers rated for Ex ia IIC zones.

The DIN-rail isolator restricts electrical energy delivered to the field wiring below ignition thresholds while providing 1500 V galvanic isolation. Integrated transient voltage surge protection protects delicate sensor electronics against high-voltage lightning surges.

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