The key differences between Differential Pressure Switches (DPS) and Differential Pressure Transmitters (DPT) in HVAC applications are:
1. Function:
- DPS: Provides a binary, on/off signal based on a preset pressure differential setpoint.
- DPT: Provides a continuous, proportional electrical output (4-20 mA or 0-10 VDC) that corresponds to the measured pressure difference.
2. Applications:
- DPS:
- Filter status monitoring - Triggers an alarm when the filter becomes clogged and the pressure drop across it exceeds the setpoint.
- Airflow monitoring - Detects loss of airflow in ducts or air handlers.
- Proof of operation - Verifies that a fan or blower is running by detecting the pressure difference it creates.
- DPT:
- Variable Air Volume (VAV) systems - Provides feedback to the control system to modulate dampers and maintain desired airflow.
- Building pressure control - Monitors and maintains the desired pressure differential between indoor and outdoor environments.
- Air balancing - Provides data for adjusting dampers and registers to achieve the desired airflow distribution.
- Filter monitoring - Tracks the gradual increase in pressure drop across filters to schedule maintenance.
3. Precision and Range:
- DPS: Typically have a fixed setpoint and a limited adjustability range.
- DPT: Offer a wider measurement range and better precision, allowing for more accurate monitoring and control.
4. Output:
- DPS: Provides a simple on/off signal, suitable for basic monitoring and alarm applications.
- DPT: Provides a continuous, proportional output signal that can be integrated into more advanced control systems.
In summary, DPS devices are better suited for basic monitoring and switch-based control, while DPT devices are preferred for more sophisticated pressure-based control, monitoring, and optimization applications in HVAC systems.
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