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QDY70A-FQ Magnetic Float Level Transmitter for Storage Tanks

A magnetic float level transmitter with frictionless, non-contact measurement, 4–20mA output, and flexible mounting for reliable tank level monitoring.
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QDY70A-FQ Magnetic Float Level Transmitter

QDY70A-FQ magnetic float level transmitter for direct continuous level measurement

Float Tracking for Direct Level Measurement

QDY70A-FQ is a float level transmitter designed around “Float Tracking for Direct Level Measurement.” Improves level stability, response or operating efficiency under changing field conditions. The stated operating range, accuracy, response, overload or stability feature supports more dependable data under changing field conditions. The feature is directly relevant to water tank, wastewater treatment and level monitoring projects. Maintain clearer trend data during long-term industrial operation, helping engineers keep the installation, inspection and signal path easier to manage during long-term operation.

QDY70A-FQ float level transmitter with multiple mounting options for different tanks

Multiple Mounting Options for Different Tank Structures

QDY70A-FQ is a float level transmitter designed around “Multiple Mounting Options for Different Tank Structures.” The dedicated mechanical and connector structure simplifies installation, replacement and field maintenance. The dedicated mechanical, connector or mounting structure helps the instrument fit the intended pipe, tank, cabinet or equipment interface. The feature is directly relevant to water tank, wastewater treatment and level monitoring projects. Shorten installation time and simplify later field maintenance, helping engineers keep the installation, inspection and signal path easier to manage during long-term operation.

QDY70A-FQ 4-20mA float level transmitter for remote storage tank monitoring

Remote Level Monitoring for Storage Tanks

QDY70A-FQ is a float level transmitter designed around “Remote Level Monitoring for Storage Tanks.” Converts the measured level into a standard signal for PLC, DCS or display instruments. The standardized signal path routes the measured value to PLCs, DCS platforms, displays or remote monitoring equipment. The feature is directly relevant to water tank, wastewater treatment and level monitoring projects. Connect field measurements directly to existing plc and monitoring systems, helping engineers keep the installation, inspection and signal path easier to manage during long-term operation.

Working Principle Diagram

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Technical Specifications

Output Signal:2-wire 4-20mA analog output, linearly proportional to liquid level


Linearity Error:≤±0.5% F.S. (full temperature compensated)


Repeatability:≤0.1% F.S.


Hysteresis:≤0.2% F.S.


Zero Temperature Drift:±0.05% F.S./℃ (within full compensated temperature range)


Sensitivity Temperature Drift:±0.05% F.S./℃


Long-term Stability:≤0.3% F.S./year; no drift from float wear or medium scaling


Step Response Time:≤200ms; follows liquid level fluctuations without lag


Sensing Principle:Magnetic buoyancy coupling, non-contact detection; zero mechanical friction inside the sensing rod


Optional Alarm Output:1~2 SPDT relay outputs (5A @ 250VAC) for high/low level interlock and alarm


On-site Calibration:Zero and span adjustment via head keypad; no tank draining required for routine calibration


Local Display Function:Backlit LCD shows real-time level, percentage, engineering unit and fault code


Reverse Polarity Protection:Full power supply reverse tolerance; no internal circuit damage with reversed wiring


Output Short-circuit Protection:Continuous short-circuit proof; automatic recovery after fault removal

Dimension Chart

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Wiring Diagram

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