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Sensors for Extraction, Filtration, and Ventilation Technology
Sensors make operating conditions measurable. In extraction systems and filter systems, they provide readings that can be used for monitoring, control, or fault diagnosis. Typical measured variables include pressure, differential pressure, flow rate, temperature, and switch states. The right sensor technology thus enables automated and more transparent system operation.
Differential pressure as an important measurement
In filter systems, differential pressure is a key parameter. It describes the pressure difference across the filter. If this value increases, it may indicate increasing filter loading or higher system resistance. In suitable systems, the measured value can be used for filter cleaning, maintenance alerts, or fan control.
What to Look for in Sensors
ā appropriate measurement unit and measurement range
ā Appropriate source text
ā Supply voltage and connection type
ā Protection Class and Environmental Conditions
ā Appropriate measurement point in the system
ā Compatibility with control systems or variable frequency drives
The measurement point and installation location are key factors
A high-quality sensor will only provide usable readings if it is installed in a suitable location. Turbulence, contamination, condensation, or unsuitable pressure taps can distort measurements. Therefore, the sensor and its installation location should always be considered as a single unit.
Typical sensor tasks
| Measurement unit | Typical Task | Application |
|---|---|---|
| Differential pressure | Monitor resistance | Filter condition |
| Record equipment condition | Piping Network / Fan Control | |
| flow rate | Monitor air flow | Extraction efficiency |
| Temperature | monitor thermal conditions | Process and Exhaust Air |
Sensors as a Component of the Control System
In automated systems, the sensor value is often processed directly by the control system. One example is constant-pressure control: The sensor measures the pressure in the piping network, the control system compares it to the setpoint, and the variable frequency drive adjusts the fan speed. This allows a system to respond to changing open sensing points.
Typical Applications
ā Monitoring of filter elements
ā Fan speed control
ā Monitoring of air and pressure conditions
ā Troubleshooting and Maintenance Notifications
ā Process monitoring in extraction systems
FAQ
What is the difference between pressure and differential pressure?
Pressure describes a measured value at a single point. Differential pressure compares two pressure points with each other.
Why is the measurement range important?
An inappropriate measurement range can lead to poor resolution or sensor overload.
Can sensors directly control a fan?
In most cases, the values are evaluated via a control system or a variable frequency drive.
Do sensors need to be maintained?
Depending on the measurement principle and environment, measurement points, lines, and functions should be checked regularly.
What is important in a dusty environment?
The protection class, measuring principle, and positioning must be appropriate for the load.
Consulting on Sensor Technology
The selection depends on the measured variable, measurement range, existing control system, desired output signal, and installation conditions.
