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  • New item   -83.73€Differential pressure PI controller for fans | 0-1000Pa | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VDC | IP65 | Sentera Controls | HPSPF-1K0
    New item   -83.73€Differential pressure PI controller for fans | 0-1000Pa | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VDC | IP65 | Sentera Controls | HPSPF-1K0 1
    New item   -83.73€Differential pressure PI controller for fans | 0-1000Pa | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VDC | IP65 | Sentera Controls | HPSPF-1K0 2
    New item   -83.73€Differential pressure PI controller for fans | 0-1000Pa | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VDC | IP65 | Sentera Controls | HPSPF-1K0 3
    New item   -83.73€Differential pressure PI controller for fans | 0-1000Pa | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VDC | IP65 | Sentera Controls | HPSPF-1K0 4
    New item   -83.73€Differential pressure PI controller for fans | 0-1000Pa | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VDC | IP65 | Sentera Controls | HPSPF-1K0 5

    Differential pressure PI controller for fans | 0-1000Pa | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VDC | IP65 | Sentera Controls | HPSPF-1K0

    Code: HPSPF-1K0
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  • Product description

    Differential pressure PI controller for fans | 0-1000Pa | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VDC | IP65 | Sentera Controls | HPSPF-1K0

    HPSPF-1K0 – a Sentera Controls differential pressure controller with an integrated PI control algorithm, measuring range 0–1000 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.

    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
    0–1000 Pa
    Output
    0-10 VDC / 0-20 mA / PWM + Modbus RTU
    Power supply
    24 VDC, 4-wire
    Protection class
    IP65

    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 0–1000 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 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. Four LEDs show whether the value is stable within the interval, outside it or in the alarm zone, and the same status is available via Modbus RTU.

    Benefits HPSPF-1K0?
    One compact IP65 device replaces a pressure transmitter and a separate controller: it measures, regulates, signals with LED indicators and integrates into a BMS via Modbus RTU.

    Technical specifications

    Product type Differential pressure PI controller for fans
    Manufacturer / code Sentera Controls / HPSPF-1K0
    Series HPSP-2 (0–1000 / 2000 / 4000 / 10 000 Pa)
    Measuring range 0–1000 Pa
    Controlled quantities Pressure difference (Pa), airflow (m³/h), air velocity (m/s)
    Control PI with anti-windup; 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)
    Communication Modbus RTU (RS485), configuration with 3SModbus or Sensistant
    Indication 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 0.12 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

    • PI control with anti-windup – the controller maintains the setpoint itself and directly controls the fan – no PLC or separate controller is needed.
    • 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 0–1000 Pa – for low-pressure systems – ducts of apartments, offices and smaller heat recovery units, VAV zones, filter monitoring
    • 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 apartment and office ventilation installer.
    The 0–1000 Pa range with ±2 % accuracy (±20 Pa) suits low-pressure ducts and VAV zones.
    For the BMS integrator.
    A controller without a display: the setpoint, PI coefficients, alarms and status are controlled via Modbus RTU, so it connects naturally to SCADA.
    For heat recovery unit manufacturers.
    The 24 VDC supply and separate supply and output GND (4 wires) allow the controller to be integrated into the equipment's 24 VDC control circuit.

    Practical application

    If in an office VAV system the duct pressure rises when some zone dampers close, then the HPSPF-1K0 with a PSET-PVC-200 nozzle in the duct slows the EC fan with the AO1 0-10 VDC signal and holds the setpoint within the 0–1000 Pa range with ±20 Pa accuracy. 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 HPSPF-1K0 adapts to different sites – only the measuring points and what is connected to the output change:

    Site What is connected Result Installer's note
    Office or apartment ventilation, VAV zone PSET-PVC-200 in the duct → + / −; AO1 → EC fan 0-10 VDC input With some of the dampers closed, the duct pressure stays constant and noise does not increase Install the nozzles away from elbows and branches
    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) HPSPF-LP (-125…+125 Pa, 24 VDC)
    0–1000 Pa HPSPF-1K0 (0–1000 Pa, 24 VDC) ← this model
    0–2000 Pa HPSPF-2K0 (0–2000 Pa, 24 VDC)
    0–4000 Pa HPSPF-4K0 (0–4000 Pa, 24 VDC)
    0–10 000 Pa HPSPF-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 HPSPG-1K0).
    When to choose another solution: with an LED display – DPSPF-1K0; for controlling damper actuators – HPSA 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
    • 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

    • No display – the value is visible only via Modbus RTU or LED statuses (with a display – DPSPF-1K0)
    • 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
    • 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

    0–1000 Pa
    PI controller
    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 0–1000 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 0–1000 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 HPSPF-1K0 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 or Sensistant.
    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 HPSPF-1K0 model this is ±20 Pa.
    Can it be installed outdoors?
    IP65 housing; the datasheet specifies an operating environment of -5…+65 °C, < 95 % rH non-condensing.

    Differential pressure PI controller for fans | 0-1000Pa | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VDC | IP65 | Sentera Controls | HPSPF-1K0

    Sentera HPSPF-1K0 – differential pressure PI controller 0–1000 Pa, 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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