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QDF70B-FS Waterproof Differential Pressure Transmitter
QDF70B-FS is a differential air pressure transmitter designed around “Waterproof Structure for Wet Installation Areas.” 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 hvac duct, pressure monitoring and industrial process 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.
QDF70B-FS is a differential air pressure transmitter designed around “Reliable Air Pressure Measurement & Conversion.” Provides dependable air pressure measurement for industrial automation systems. The sensing structure converts the physical process variable into a clear signal for industrial monitoring and automation. The feature is directly relevant to hvac duct, pressure monitoring and industrial process projects. Improve measurement clarity and maintenance efficiency in hvac duct applications, helping engineers keep the installation, inspection and signal path easier to manage during long-term operation.
QDF70B-FS is a differential air pressure transmitter designed around “Installation-focused Design for Differential Air Pressure Transmitter.” 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 hvac duct, pressure monitoring and industrial process 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.
Working Principle Diagram
Sensing Principle:MEMS capacitive differential pressure chip with full-temperature-range digital temperature compensation
Measurement Type:Three-mode versatility: positive pressure, negative pressure, and differential pressure
Standard Measurement Range:0–50 Pa / 0–100 Pa / 0–500 Pa / 0–1 kPa / 0–5 kPa / 0–10 kPa
Long-Term Stability:≤0.2% FS/year; extremely low annual drift
Damping Response Time:Standard 100 ms–1 s; supports custom damping parameters
Temperature Coefficient of Drift Across the Full Temperature Range:≤0.05% FS/°C (within the -10°C to 50°C operating range)
Zero-Point Temperature Drift:≤0.1% FS/°C
Standard Output Signal:4–20 mA two-wire / 0–5 V / 0–10 V three-wire; optional RS-485 Modbus-RTU digital output
Dimension Chart
Wiring Diagram