Identity

The Static Pressure Sensor is an environmental microclimate device that uses a differential silicon diaphragm to measure internal vacuum (negative) pressure created by automated ventilation exhaust systems.

Overview

The Static Pressure Sensor is a medium-priority diagnostic unit essential for dynamic airflow management. It continuously translates the differential between indoor and outdoor pressure into an analog signal for the Smart Controller, regulating the wall air inlets. The system is susceptible to physical blockages from dust, feathers, and condensation, and the sensitive internal diaphragm can be burst if operators blow into the pressure ports manually.

Structured Facts

Classification

Ventilation and Pneumatic Control Equipment / Automated.

Purpose

Measures the difference between indoor and outdoor pressure to manage wall air inlets, ensuring proper negative pressure and fresh air mixing.

Working Principle

Contains two chambers separated by a flexible silicon diaphragm. One chamber is open to the inside of the house; the other connects to an outside reference tube. Differential pressure deforms the diaphragm, altering its electrical resistance. This is converted into an analog signal (A/D counts) used by the Smart Controller to dynamically adjust the air inlets.

Technical Specifications

• System Signal Output: Analog Voltage Signal (0 - 10 VDC).

Capacity

• Not specified in sources.

Installation Requirements

Pressure lines should be routed downward from the sensor to prevent moisture/condensation buildup inside the internal chambers.

Operating Parameters

• Not specified in sources.

Maintenance

Calibrate with the house completely closed and all fans turned off. Disconnect the air hoses to verify that the A/D value falls within the zero-pressure permitted calibration range. If out of bounds, adjust the calibration screw.

Cleaning & Disinfection

Keep pressure reference ports clear of dust and feathers.

Advantages

Enables precision negative-pressure tunnel and transitional ventilation.

Limitations

Outdoor reference tube or indoor ports easily blocked by dust, feathers, or condensation, causing delayed readings or sensor lockup. Zero-pressure baseline drifts over time. Manually blowing into the pressure ports will burst the silicon diaphragm and ruin the sensor.

Safety Precautions

Do not manually blow into the pressure tubes during testing.

Quantitative Data

• Voltage: System Signal Output 0 - 10 VDC.

Relationships

• Housing Systems: Tunnel Ventilated Houses, Semi-EC Houses.
• Environmental Controls: Smart Controller, Inlet Deflector Curtains, Exhaust Fans.
• Production Stages: All stages.
• Related Equipment: Smart Controller, Wall Inlets.
• Maintenance SOPs: Zero-pressure baseline calibration.