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QDF70B-FS Waterproof Differential Pressure Transmitter for HVAC Ducts

A waterproof wall-mount differential pressure transmitter for reliable low-pressure air monitoring in HVAC ducts, ventilation systems, and humid installation areas.
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QDF70B-FS Waterproof Differential Pressure Transmitter

QDF70B-FS Differential Air Pressure Transmitter showing waterproof structure for wet installation areas

Waterproof Structure for Wet Installation Areas

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 Differential Air Pressure Transmitter showing reliable air pressure measurement conversion

Reliable Air Pressure Measurement & Conversion

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 Differential Air Pressure Transmitter showing installation-focused design for differential air pressure transmitter

Installation-focused Design for Differential Air Pressure Transmitter

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

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Technical Specifications

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

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Wiring Diagram

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Phone: +86-19715617532
Add: Building 14, University Science and Technology Park, Fenghuangshan Economic Development Zone, Xiangshan District, Huaibei City, Anhui Province

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