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  • New item   -113.1€Constant pressure PI controller for fans with display | 0-4000Pa | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VDC | IP65 | Sentera Controls | DPSPF-4K0
    New item   -113.1€Constant pressure PI controller for fans with display | 0-4000Pa | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VDC | IP65 | Sentera Controls | DPSPF-4K0 1
    New item   -113.1€Constant pressure PI controller for fans with display | 0-4000Pa | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VDC | IP65 | Sentera Controls | DPSPF-4K0 2
    New item   -113.1€Constant pressure PI controller for fans with display | 0-4000Pa | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VDC | IP65 | Sentera Controls | DPSPF-4K0 3
    New item   -113.1€Constant pressure PI controller for fans with display | 0-4000Pa | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VDC | IP65 | Sentera Controls | DPSPF-4K0 4
    New item   -113.1€Constant pressure PI controller for fans with display | 0-4000Pa | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VDC | IP65 | Sentera Controls | DPSPF-4K0 5

    Constant pressure PI controller for fans with display | 0-4000Pa | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VDC | IP65 | Sentera Controls | DPSPF-4K0

    Code: DPSPF-4K0
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  • Product description

    Constant pressure PI controller for fans with display | 0-4000Pa | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VDC | IP65 | Sentera Controls | DPSPF-4K0

    DPSPF-4K0 – a Sentera Controls differential pressure controller with an integrated PI control algorithm, measuring range 0–4000 Pa. It measures the pressure difference itself and, via its 0-10 VDC / 0-20 mA analog or PWM output, directly controls EC fans, frequency converters or AC fan speed controllers to maintain the set value. On the front – a 4-digit 7-segment LED display showing the actual pressure, airflow or air velocity.

    Key idea:
    This is a sensor and a controller in one housing: no separate pressure transmitter, PLC or BMS logic is needed. The controller itself changes the fan speed until the pressure, airflow or air velocity in the duct matches the setpoint – the system adapts to damper positions and filter fouling.
    Measuring range
    0–4000 Pa
    Output
    0-10 VDC / 0-20 mA / PWM + Modbus RTU
    Power supply
    24 VDC, 4-wire
    Protection class
    IP65, LED display

    Operating principle

    The controller is mounted on a wall or duct structure; the measuring points are connected to the aluminium nozzles "+" and "−" with tubes (PSET-PVC-200, PSET-QF-200 or the Pitot tube kit PSET-PTS-200 / PSET-PTL-200). Power (Vin, GND), the Modbus RTU line (A, /B) and the analog output AO1 to the fan are connected at the terminals. The F type has separate power and analog output GNDs, so it is connected with at least 4 wires – if both GNDs are joined, the measurement may be inaccurate; do not mix F and G types in the same network.

    An integrated high-resolution digital sensor measures the pressure difference within the 0–4000 Pa range, and the controller, depending on the mode selected over Modbus RTU, works by pressure difference (Pa), air volume (m³/h – when the fan K factor is known, otherwise Q = A × V) or air velocity (m/s – with a Pitot tube kit). The PI algorithm with anti-windup and automatic tuning (auto-tune) compares the measured value with the setpoint and changes the AO1 signal of 0-10 VDC (RL ≥ 50 kΩ), 0-20 mA (RL ≤ 500 Ω) or 0–100 % PWM (1 kHz); the P and I coefficients, response time (0.1–10 s), min. / max. interval and alarm limits are set over Modbus RTU.

    Result – the fan speed is varied until the pressure, airflow or air velocity matches the setpoint, so the system adapts to damper positions and filter fouling without a separate sensor and PLC. The actual value is shown on a 4-digit 7-segment LED display, and four LEDs show whether it is stable within the interval, outside it or in the alarm zone.

    Benefits DPSPF-4K0?
    One compact IP65 device replaces a pressure transmitter and a separate controller: it measures, regulates, signals with LED indicators, shows the value on a display and integrates into a BMS via Modbus RTU.

    Technical specifications

    Product type Constant pressure PI controller for fans with display
    Manufacturer / code Sentera Controls / DPSPF-4K0
    Series DPSP-2 (0–1000 / 2000 / 4000 / 10 000 Pa)
    Measuring range 0–4000 Pa
    Controlled quantities Pressure difference (Pa), airflow (m³/h), air velocity (m/s)
    Control PI with anti-windup, automatic tuning (auto-tune); integrated K factor
    Power supply 18–34 VDC, max. 1.8 W, Imax 100 mA
    Connection 4-wire connection (separate supply and output GND)
    Analog / modulating output AO1 0-10 VDC (RL ≥ 50 kΩ) / 0-20 mA (RL ≤ 500 Ω) / 0–100 % PWM, 1 kHz (RL ≥ 50 kΩ)
    PWM internal voltage source 3.3 or 12 VDC (jumper JP1)
    Accuracy ±2 % of the measuring range
    Response time 0.1–10 s (selectable)
    Min. interval Pressure 50 Pa; airflow 10 m³/h; air velocity 1 m/s
    Communication Modbus RTU (RS485), configuration with 3SModbus
    Indication 4-digit 7-segment LED display; 4 LEDs (green – power / Modbus, green – within range, yellow – out of range, red – alarm / sensor fault)
    Button SW1 – sensor zero calibration and Modbus register reset
    Pressure nozzles Aluminium, “+” and “−”
    Housing ASA, grey (RAL 9002)
    Protection class IP65 (EN 60529)
    Operating environment -5…+65 °C, < 95 % rH non-condensing
    Wire cross-section 1.5 mm² (recommended)
    Weight 0.132 kg (net)
    Compliance EMC 2014/30/EU (EN 61326-1, EN 61326-2-3), WEEE 2012/19/EU, RoHS 2011/65/EU

    Manufacturer documentation

    ✔ Recommended by Elektrotechnikos sprendimai

    Original manufacturer documentation – technical data, wiring diagrams and installation instructions.

    Main functions

    • LED display – the actual value is visible on site – no computer or manometer is needed when commissioning the system.
    • PI control with anti-windup – the controller maintains the setpoint itself and directly controls the fan – no PLC or separate controller is needed.
    • Auto-tune – automatic PI parameter tuning based on the system response.
    • Three modes – pressure difference, airflow (by K-factor) or air velocity (with a Pitot tube).
    • Selectable output – 0-10 VDC, 0-20 mA or PWM – suitable for most EC motors, frequency converters and actuators.
    • Adjustable response time – 0.1–10 s – stable control even with pulsating flow.
    • Range and alarm limits – LED indicators and Modbus registers immediately show when a value goes outside the permitted limits.
    • Modbus RTU – setpoint, PI coefficients and status are controlled and monitored from a BMS or SCADA.
    • Zero calibration – with the SW1 button – quick commissioning on site.

    Where is it used?

    • Measuring range 0–4000 Pa – for higher-pressure systems – large air handling units, long duct networks, high-pressure fans
    • Maintaining constant pressure in supply and extract ducts
    • Constant air volume (CAV) / variable air volume (VAV) systems with EC fans
    • Overpressure in clean rooms and stairwells (fire protection)
    • Reduced pressure in restaurant kitchens and laboratories
    • Ensuring the minimum ventilation air volume (m³/h) in buildings
    • Ventilation modernization by replacing fans with EC fans

    On-demand operation

    For the large building HVAC designer.
    The 0–4000 Pa range is intended for long duct networks and high-pressure fans, with an accuracy of ±80 Pa.
    For HVAC commissioning engineers.
    The LED display shows the actual pressure, airflow or air velocity on site, and auto-tune helps tune the PI parameters quickly.
    For the control panel assembler.
    The controller is powered with 24 VDC from an SEPS8-24-40 or DRPS8-24-40 power supply and connected with 4 wires with separate GNDs.

    Practical application

    If the supply fan of a large building works at up to 4000 Pa, then the DPSPF-4K0 controls the EC motor with a PWM (1 kHz) or 0-10 VDC signal, and the display and four LEDs show whether the pressure is within the set range. Power the controller at 24 VDC (e.g. from a DRPS8-24-40) and wire it with 4 wires.

    Application guide: how it is used in practice

    The same DPSPF-4K0 adapts to different sites – only the measuring points and what is connected to the output change:

    Site What is connected Result Installer's note
    Large air handling unit, long duct network PSET-QF-200 (aluminium nozzles) → + / −; AO1 → EC fan 0-10 VDC input A high-pressure system is controlled without range overflow Check that the working pressure of the tubes and nozzles (up to 10 000 Pa) is sufficient
    Constant air volume (CAV) PSET-PVC-200 at the fan inlet measuring points; known K factor The fan delivers the set m³/h regardless of filter fouling You will find the K factor in the fan manufacturer's data
    Maintaining air velocity in the duct Pitot tube PSET-PTS-200 (Ø100–300 mm) or PSET-PTL-200 (Ø150–500 mm) The controller maintains the set air velocity (m/s) and, when the cross-section is known, the airflow Install the tube no closer than 7.5 D downstream of an elbow or a fan
    AC fan or frequency converter AO1 0-10 VDC / 0-20 mA → Sentera speed controller or frequency converter input The same controller also controls non-EC actuators Select the signal type via Modbus RTU
    Building with BMS / SCADA Modbus RTU (RS485) → A, /B Setpoint and alarms are changed centrally, status is monitored remotely For configuration – the CNVT-USB-RS485 converter and the 3SModbus software
    Power supply 24 VDC power supply (e.g. SEPS8-24-40 or DRPS8-24-40) → Vin, GND Stable controller operation At least 4 wires – do not join the power supply and output GND

    How to choose the range of a pressure controller

    Measuring range Recommended model
    -125…+125 Pa (bidirectional) DPSPF-LP (-125…+125 Pa, 24 VDC)
    0–1000 Pa DPSPF-1K0 (0–1000 Pa, 24 VDC)
    0–2000 Pa DPSPF-2K0 (0–2000 Pa, 24 VDC)
    0–4000 Pa DPSPF-4K0 (0–4000 Pa, 24 VDC) ← this model
    0–10 000 Pa DPSPF-10K (0–10 000 Pa, 24 VDC)
    Rule: the operating pressure must be within the range and, ideally, occupy a larger part of it – the ±2 % accuracy is calculated from the full range, so do not choose an overly large range for a low pressure. Choose the supply according to the system: type F – 24 VDC, 4-wire; type G – 24 VAC / VDC, 3-wire (the twin of this model is DPSPG-4K0).
    When to choose another solution: without a display – HPSPF-4K0; for controlling damper actuators – DPSA series; for two setpoints (day / night) – SPS2 series; for pressure measurement only, without regulation – HPS-2 / DPS-2 transmitters; for simple on / off switching by pressure – PSW pressure switches.

    Pros

    • Sensor and PI controller in one
    • LED display for the actual value
    • Pressure, airflow or air velocity mode
    • 0-10 VDC / 0-20 mA / PWM output
    • Modbus RTU – all parameters remotely
    • IP65 enclosure, aluminium nozzles
    • Adjustable response time 0.1–10 s

    Cons / limitations

    • The setpoint and PI parameters are changed only via Modbus RTU – a CNVT-USB-RS485 converter and the 3SModbus software are required
    • At least 4 wires are needed – not suitable for 3-wire connection
    • A single setpoint – for day / night mode choose the SPS2 series with two setpoints
    • The pressure connection kit is not included – choose PSET-PVC-200, PSET-QF-200 or the Pitot kit PSET-PTS-200 / PSET-PTL-200
    • Only for clean air and non-aggressive, non-flammable gases

    Safety and installation notes

    • Installation and connection are to be carried out by a qualified specialist with the power disconnected.
    • Power supply – only 18–34 VDC; do not exceed the specified limits.
    • Do not connect the supply and analog output GND of the F-type controller – connect with at least 4 wires.
    • Do not use type F and G controllers in the same network.
    • For clean air and non-aggressive, non-flammable gases only; ambient temperature -5…+65 °C, non-condensing.
    • Before start-up, perform zero calibration of the sensor (button SW1) with the pressure tubes disconnected.

    Quick selection guide

    0–4000 Pa
    PI controller
    LED display
    0-10 VDC / 0-20 mA / PWM
    Modbus RTU
    24 VDC
    IP65
    Suitable when you need:
    • to maintain a constant pressure or airflow in the 0–4000 Pa range by controlling a fan;
    • to avoid tuning a separate sensor and controller;
    • to integrate pressure control into a BMS via Modbus RTU.
    Check before use:
    • the operating pressure – whether it fits within the 0–4000 Pa range;
    • the input signal of the controlled device (0-10 VDC, 0-20 mA or PWM);
    • the supply type and connection: 24 VDC, 4-wire (type F);
    • whether a pressure connection kit is needed (PSET-PVC-200, PSET-QF-200, PSET-PTS-200, PSET-PTL-200).
    Important reminder: The DPSPF-4K0 regulates to a single setpoint; the setpoint and parameters are set via Modbus RTU, so commissioning requires a CNVT-USB-RS485 converter and the 3SModbus software.

    FAQ

    How do I set the setpoint?
    Via Modbus RTU – with the CNVT-USB-RS485 converter and the free Sentera 3SModbus software.
    What does the display show?
    Actual pressure difference, air volume or air velocity – depending on the selected mode.
    Can it be controlled by air volume in m³/h?
    Yes, if the fan K-factor is known; otherwise the airflow is calculated from the air velocity and the duct cross-section (Q = A × V) using a Pitot tube kit.
    What is the difference between the F and G types?
    F – 24 VDC, separate supply and output GND, connected with 4 wires; G – 24 VAC or VDC, common GND, connected with 3 wires.
    Are pressure tubes included in the kit?
    No, choose the PSET-PVC-200, PSET-QF-200 or the Pitot tube kit PSET-PTS-200 / PSET-PTL-200.
    What is the accuracy?
    ±2 % of the measuring range – for the DPSPF-4K0 model this is ±80 Pa.

    Constant pressure PI controller for fans with display | 0-4000Pa | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VDC | IP65 | Sentera Controls | DPSPF-4K0

    Sentera DPSPF-4K0 – differential pressure PI controller 0–4000 Pa with LED display, directly controlling EC fans, frequency converters or AC fan speed controllers with a 0-10 VDC / 0-20 mA / PWM signal, with Modbus RTU, 24 VDC supply and IP65 housing.

    Illustrative image may have been created using AI. The appearance of the product may differ slightly from the image shown. Please refer to the technical specification.

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