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EU declaration conformity
Differential pressure controller | -125 to 125 Pa | 24 VAC - VDC
Product description
Differential pressure controller for fans generating Variable Air Volume flow (VAV control). The supply voltage is 24 VAC or 24 VDC. The operating range is -125 to +125 Pa.
It controls differential pressure or air volume flow. Air velocity control is also possible in combination with a Pitot tube connection set.
The analogue output can control EC fans, frequency inverters or AC fan speed controllers. The output type is selectable via Modbus RTU communication. The four LED indicators provide a visual indication of the transmitter 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.
LED indication
This pressure controller provides an unambiguous visual representation of the differential pressure status using green, yellow and red LEDs. The green LED signals that the pressure level is within the designated range. As the pressure level approaches the alert range, the yellow LED illuminates. When the pressure falls outside the acceptable range, the red LED indicates a deviation. Additionally, the LEDs can display the status of the air volume flow or air velocity. A second green LED signifies the sensor operational status, activating when both power supply and Modbus RTU communication are enabled.
This pressure controller provides an unambiguous visual representation of the differential pressure status using green, yellow and red LEDs. The green LED signals that the pressure level is within the designated range. As the pressure level approaches the alert range, the yellow LED illuminates. When the pressure falls outside the acceptable range, the red LED indicates a deviation. Additionally, the LEDs can display the status of the air volume flow or air velocity. A second green LED signifies the sensor operational status, activating when both power supply and Modbus RTU communication are enabled.
How does it work?
This pressure controller has one analogue output. This output controls EC fans or AC fan speed controllers based on the measured differential pressure, air volume flow or air velocity. The fan speed is controlled to maintain the measured value constant at the setpoint. The setpoint can be adjusted via Modbus RTU. To make this controller compatible with most EC fans and AC fan speed controllers, the output type can be adjusted via Modbus RTU: 0-10 VDC / 0-20 mA / 0-100 % PWM. To match the reaction time of the fan to the application, P and I factors can be adjusted via Modbus RTU. A typical application is to guarantee a constant flow of fresh air, regardless of the demand.
This pressure controller has one analogue output. This output controls EC fans or AC fan speed controllers based on the measured differential pressure, air volume flow or air velocity. The fan speed is controlled to maintain the measured value constant at the setpoint. The setpoint can be adjusted via Modbus RTU. To make this controller compatible with most EC fans and AC fan speed controllers, the output type can be adjusted via Modbus RTU: 0-10 VDC / 0-20 mA / 0-100 % PWM. To match the reaction time of the fan to the application, P and I factors can be adjusted via Modbus RTU. A typical application is to guarantee a constant flow of fresh air, regardless of the demand.
The sensor controller features PI control. PI stands for proportional-integral control, a type of feedback control system commonly used in engineering and control theory. This control system adjusts the output based on the difference between the desired setpoint and the actual value. Integrated PI control means that both proportional and integral actions are integrated into the control scheme.
3-wire connection
The supply voltage, the analogue output and Modbus RTU communication can be connected via the cage clamp terminal block. They eliminate the need for routine maintenance and guarantee a reliable contact for solid or stranded wires. This sensor controller can be supplied with 24 VDC or with 24 VAC. It is intended for 3-wire connection. The ground of the output (GND) is internally connected to the ground of the supply voltage (V-). Make sure not to connect this common ground to other devices that are powered by a DC voltage.
The supply voltage, the analogue output and Modbus RTU communication can be connected via the cage clamp terminal block. They eliminate the need for routine maintenance and guarantee a reliable contact for solid or stranded wires. This sensor controller can be supplied with 24 VDC or with 24 VAC. It is intended for 3-wire connection. The ground of the output (GND) is internally connected to the ground of the supply voltage (V-). Make sure not to connect this common ground to other devices that are powered by a DC voltage.
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 made from aluminium. The sensor 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 made from aluminium. The sensor enclosure offers an IP65 protection against ingress of dirt and water. This pressure controller can be wall-mounted.
Maintain overpressure in staircases
A typical application for differential pressure controllers with this range is to maintain an underpressure or overpressure in staircases or cleanrooms.
E.g. by creating a constant overpressure in the staircase, it remains smoke-free in case of fire.
A typical application for differential pressure controllers with this range is to maintain an underpressure or overpressure in staircases or cleanrooms.
E.g. by creating a constant overpressure in the staircase, it remains smoke-free in case of fire.
A low-pressure differential pressure controller has other application fields across different industries and systems where precise control of airflow, fluid flow or pressure is essential. In HVAC systems, low-pressure differential pressure controllers are used to regulate airflow in ductwork, ensuring proper ventilation and air distribution throughout a building. They help maintain desired air pressure differentials between different zones or rooms. In cleanroom facilities, maintaining precise air pressure differentials is crucial for controlling contamination and ensuring product quality. Low-pressure differential pressure controllers play a vital role in achieving and maintaining these controlled environments. Laboratories often require controlled airflow to maintain specific environmental conditions, such as temperature, humidity and cleanliness. Low-pressure differential pressure controllers are used in fume hoods, biosafety cabinets, and other containment systems to regulate airflow and protect researchers from exposure to hazardous materials. In healthcare settings, low-pressure differential pressure controllers are used in isolation rooms, operating rooms and cleanrooms to control air quality and prevent the spread of infectious diseases.
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