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EU declaration conformity
Constant pressure controller | display | -125 to 125 Pa | PoM supply
Product description
This a differential pressure controller with display for fans. A typical application is Variable Air Volume flow or VAV control. The operating range is -125 to +125 Pa. The supply voltage is 24 VDC PoM - both Modbus RTU communication and the supply voltage are connected via the RJ45 socket.
It controls differential pressure or air volume flow. Air velocity control is also possible in combination with a Pitot tube set. EC fans, frequency inverters or AC fan speed controllers can be controlled via Modbus RTU communication.
The 7-segment LED display and the four LED indicators provide a clear, visual indication of the device status and the controlled values. The differential pressure setpoint and all other settings can be adjusted via Modbus RTU.
Additional specifications and description
Constant pressure, air volume flow or air velocity?
This differential pressure controller controls EC fans or AC fan speed controllers. It maintains the differential pressure [Pa] constant at the set point. The operating range is -125 to +125 Pa. It is also possible to control fan speed based on air volume flow [m³/hr] or air velocity [m/s]. To control air volume flow based on the K-factor of the fan, use the optional connection set type PSET-PVC-200 or PSET-QF-200. This connection set can also be used to control differential pressure. To control air volume flow based on the duct cross section [cm²] or air velocity [m/s], use the optional connection set type PSET-PTS-200 or PSET-PTL-200. The setpoint can be adjusted via Modbus RTU.
This differential pressure controller controls EC fans or AC fan speed controllers. It maintains the differential pressure [Pa] constant at the set point. The operating range is -125 to +125 Pa. It is also possible to control fan speed based on air volume flow [m³/hr] or air velocity [m/s]. To control air volume flow based on the K-factor of the fan, use the optional connection set type PSET-PVC-200 or PSET-QF-200. This connection set can also be used to control differential pressure. To control air volume flow based on the duct cross section [cm²] or air velocity [m/s], use the optional connection set type PSET-PTS-200 or PSET-PTL-200. The setpoint can be adjusted via Modbus RTU.
Differential pressure in HVAC
Differential pressure refers to the measurement of the variance between two process pressures. Instruments designed for measuring differential pressure feature two process connections. Heating and cooling operations contribute to about 40 % of energy consumption in commercial buildings. This drives facility owners and managers to seek ways to optimize HVAC operations, aiming to lower operating costs while maintaining the quality of occupied spaces. A key component in enhancing the efficiency of HVAC systems is the utilization of low differential pressure transducers.
Sentera’s low differential pressure controllers are employed to control airflow and pressure differentials between two designated points within an HVAC system. This data enables the facility to monitor the system performance in real-time via the Building Management System (BMS), facilitating adjustments and optimizations to heating, cooling or airflow operations as needed. Continuous monitoring of these measurements by the BMS allows for dynamic airflow adjustments, ensuring indoor conditions remain optimal while minimizing energy consumption.
Our low differential pressure controllers are engineered for permanent integration into HVAC control systems. They facilitate the monitoring of low pressures between rooms, duct static pressures and differential pressure across filters, delivering an analogue output to an EC fan or an AC fan speed controller. The fan speed is then adjusted by increasing or decreasing it to optimize pressure levels within the system as necessary. 
Visual indication
A 7-segment LED display shows the measured pressure, volume flow or air velocity. Additionally, green, yellow, and red LEDs provide visual cues for the measured values. Green indicates that the pressure is within the acceptable range, while yellow signifies an alert range. Red indicates that the differential pressure is outside the acceptable range. These LEDs also indicate the status of air volume flow or velocity. The second green LED shows the device status, illuminating when power supply and Modbus RTU communication are active.
A 7-segment LED display shows the measured pressure, volume flow or air velocity. Additionally, green, yellow, and red LEDs provide visual cues for the measured values. Green indicates that the pressure is within the acceptable range, while yellow signifies an alert range. Red indicates that the differential pressure is outside the acceptable range. These LEDs also indicate the status of air volume flow or velocity. The second green LED shows the device status, illuminating when power supply and Modbus RTU communication are active.
How it works
This pressure controller regulates the speed of EC fans or AC fan speed controllers according to measured differential pressure, air volume flow or velocity. It adjusts fan speed to keep the measured value constant at the setpoint, which can be modified via Modbus RTU.
This pressure controller regulates the speed of EC fans or AC fan speed controllers according to measured differential pressure, air volume flow or velocity. It adjusts fan speed to keep the measured value constant at the setpoint, which can be modified via Modbus RTU.
This controller lacks analogue output and communicates with EC or AC fan speed controllers via Modbus RTU. Additionally, P and I factors can be adjusted via Modbus RTU to align the fan reaction time with the application. "P" and "I" refer to proportional and integral control parameters in a control system. By adjusting these factors, the user can optimize the system performance, responsiveness and stability.
Reduced installation time
One RJ45 connector is all it takes to connect this sensor! Modbus RTU communication and 24 VDC power supply are connected via one cable - we call it Power over Modbus or PoM. All measured values are available via Modbus RTU communication.
One RJ45 connector is all it takes to connect this sensor! Modbus RTU communication and 24 VDC power supply are connected via one cable - we call it Power over Modbus or PoM. All measured values are available via Modbus RTU communication.
High quality
The enclosure is made of high-quality r-ABS VO (UL94) plastic. This material is heat resistant, very tough and offers good protection against impacts. The pressure connection nozzles are aluminium. The controller enclosure offers an IP65 protection against ingress of dirt and water. This pressure controller can be wall-mounted.
The enclosure is made of high-quality r-ABS VO (UL94) plastic. This material is heat resistant, very tough and offers good protection against impacts. The pressure connection nozzles are aluminium. The controller enclosure offers an IP65 protection against ingress of dirt and water. This pressure controller can be wall-mounted.
Maintain overpressure in staircases
A common application for differential pressure controllers within this range involves regulating air pressure in settings such as staircases or cleanrooms. For instance, in staircases, maintaining a constant overpressure can prevent smoke infiltration during a fire.
A common application for differential pressure controllers within this range involves regulating air pressure in settings such as staircases or cleanrooms. For instance, in staircases, maintaining a constant overpressure can prevent smoke infiltration during a fire.
Similarly, in cleanrooms, precise control of air pressure differentials is crucial for managing contamination levels and upholding cleanliness standards. These controllers play a vital role in ensuring safety, cleanliness, and operational efficiency across various industrial and commercial environments.
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