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  • New item   -82.34€Differential pressure transmitter | -125...+125Pa | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VDC | 4-wire | IP65 | Sentera Controls | HPS-F--LP
    New item   -82.34€Differential pressure transmitter | -125...+125Pa | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VDC | 4-wire | IP65 | Sentera Controls | HPS-F--LP 1
    New item   -82.34€Differential pressure transmitter | -125...+125Pa | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VDC | 4-wire | IP65 | Sentera Controls | HPS-F--LP 2
    New item   -82.34€Differential pressure transmitter | -125...+125Pa | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VDC | 4-wire | IP65 | Sentera Controls | HPS-F--LP 3
    New item   -82.34€Differential pressure transmitter | -125...+125Pa | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VDC | 4-wire | IP65 | Sentera Controls | HPS-F--LP 4
    New item   -82.34€Differential pressure transmitter | -125...+125Pa | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VDC | 4-wire | IP65 | Sentera Controls | HPS-F--LP 5

    Differential pressure transmitter | -125...+125Pa | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VDC | 4-wire | IP65 | Sentera Controls | HPS-F--LP

    Code: HPS-F--LP
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  • Product description

    Differential pressure transmitter | -125...+125Pa | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VDC | 4-wire | IP65 | Sentera Controls | HPS-F--LP

    HPS-F--LP – a Sentera Controls differential pressure transmitter with a factory measuring range of -125…+125 Pa. It integrates a digital high-resolution differential pressure sensor and one analog / modulating output: 0-10 VDC, 0-20 mA or 0–100 % PWM signal, and Modbus RTU communication. The -F version – for 4-wire connection with separate supply and analog output GND, powered by 18–34 VDC only; IP65 enclosure, wall-mounted.

    Key idea:
    The transmitter converts the pressure difference between two points into a standard control signal: a controller, frequency converter or EC fan receives 0-10 VDC / 0-20 mA / PWM, while the BMS sees the actual pressure, airflow or velocity via Modbus RTU and can change all settings without a screwdriver.
    Measuring range
    -125…+125 Pa (factory default)
    Output
    0-10 VDC / 0-20 mA / PWM + Modbus RTU
    Power supply
    18–34 VDC
    Protection class
    IP65, ASA enclosure

    Operating principle

    The transmitter is mounted on a wall, and the two compared zones are connected with tubes to the aluminium “+” and “–” nozzles – e.g. a clean room and a corridor, or a stairwell and an outdoor / corridor space. The Sentera PSET-PVC-200 or PSET-QF-200 kits are used for connection.

    An integrated digital sensor measures the pressure difference; three modes are available: differential pressure (Pa), air volume flow (m³/h – by the fan K-factor or Q = A × V) and air velocity (m/s – with the external PSET-PTX-200 Pitot tube kit). The output is factory-calibrated: 0 V at -125 Pa, 10 V at +125 Pa. Over Modbus RTU (the 3SModbus application or the Sensistant configurator) the working window (min. interval 10 Pa for pressure, 10 m³/h for flow, 1 m/s for velocity), output type, response time of 0.1–10 s and alarm limits are set. The LED indicators show whether the value is normal, in the warning zone or out of limits, as well as a sensor fault.

    The analog signal directly controls a Sentera speed controller, frequency converter or EC fan – maintaining constant pressure in the duct or room, while the BMS receives the exact value via Modbus. The bidirectional range -125…+125 Pa with a 10 Pa minimum interval allows monitoring of both positive and negative room pressure – it is a pressure-cascade transmitter for clean rooms, stairwells and kitchens/laboratories.

    Benefits HPS-F--LP?
    One device – pressure, flow and velocity measurement, analog and Modbus RTU output, programmable range and alarm thresholds, and an IP65 housing. A single model in stock is enough for many sites.

    Technical specifications

    Product type Differential pressure transmitter
    Manufacturer / code Sentera Controls / HPS-F--LP
    Series HPS (-F / -G; -125…+125 Pa, 0–1000 Pa, 0–2000 Pa, 0–4000 Pa, 0–10 000 Pa)
    Number of sensors 1 (digital, high resolution)
    Measuring range -125…+125 Pa (factory default)
    Operating modes Differential pressure, airflow (K-factor or Q = A × V), air velocity (with PSET-PTX-200)
    Min. operating interval 10 Pa (pressure), 10 m³/h (flow), 1 m/s (velocity)
    Accuracy ±2 % of the operating range
    Response time 0.1–10 s (selectable)
    Outputs AO1 – single: 0-10 VDC (RL ≥ 50 kΩ), 0-20 mA (RL ≤ 500 Ω) or 0–100 % PWM 1 kHz (RL ≥ 50 kΩ)
    Factory-set output 0 V at -125 Pa, 10 V at +125 Pa
    PWM power supply Internal 3.3 or 12 VDC (jumper JP1) or external via a pull-up resistor
    Communication Modbus RTU (RS485, A, /B); configuration with 3SModbus or Sensistant
    Supply voltage 18–34 VDC (DC only)
    Consumption max. 1.3 W, Imax 71 mA (18–34 VDC)
    Connection At least 4 wires, separate power supply and output GND (-F)
    Terminals Vin, GND, A, /B, AO1, GND
    Button / indication SW1 – zero calibration or Modbus register reset; LED1 green – power and Modbus communication, LED2 green – value normal, LED3 yellow – warning zone, LED4 red – out of limits (blinking – sensor fault)
    Pressure nozzles Aluminium
    Wire cross-section 1.5 mm²
    Housing ASA plastic, grey (RAL 9002), wall-mounted
    Protection class IP65 (EN 60529)
    Operating environment -5…+65 °C, < 95 % rH non-condensing
    Medium Clean air, non-aggressive and non-flammable gases
    Weight 0.12 kg (net)
    Packaging dimensions 95 × 85 × 70 mm
    Compliance EMC 2014/30/EU (EN 61326-1, EN 61326-2-3), WEEE 2012/19/EU, RoHS 2011/65/EU

    Main functions

    • Three measuring modes – differential pressure, airflow in m³/h by K-factor or cross-section, and air velocity in m/s with a Pitot tube.
    • Selectable output – 0-10 VDC, 0-20 mA or PWM – suitable for controllers, frequency converters, EC fans and regulators.
    • Modbus RTU – all measured values and settings are accessible from a BMS / SCADA; configurable with 3SModbus or Sensistant.
    • Programmable working window – the min. and max. limits can be narrowed (down to a 10 Pa interval) – the output signal is used only for the required pressure.
    • Response time 0.1–10 s – damps pulsations and turbulence, so the signal to the controller is stable.
    • Zero calibration with a button – SW1 – quick zero check on site, and also resetting the Modbus registers to factory defaults.
    • Status LEDs – a green / yellow / red indicator shows whether the value is normal, in the warning zone or out of range.
    • PWM with internal or external power supply – a jumper selects the 3.3 or 12 VDC internal PWM supply, or an external one via a pull-up resistor.
    • Separate supply and output GND – 4-wire connection – the signal GND is separated from the supply, so the transmitter suits a common 24 VDC network with other devices.

    Where is it used?

    • Clean rooms – maintaining and monitoring positive pressure
    • Stairwell pressurisation systems (fire safety)
    • Restaurant kitchens and biosafety laboratories – negative pressure
    • Room pressure cascades in hospitals and laboratories
    • Monitoring the pressure difference between the room and the outdoors / corridor in a BMS
    • Room pressure control by changing the exhaust fan speed

    On-demand operation

    For cleanroom designers.
    a bidirectional -125…+125 Pa range with a minimum 10 Pa working window allows a single model to control both overpressure and negative pressure.
    For the BMS integrator.
    without a display – the pressure, flow or velocity value, alarm limits and all settings are accessible via Modbus RTU.
    For the electrical panel installer with a 24 VDC bus.
    The separate supply and output GND of the -F version allow the transmitter to be connected to a common DC network with other devices.

    Practical application

    If a cleanroom has to maintain a slight overpressure relative to the corridor, then the HPS-F--LP is connected with tubes between the room and the corridor, the working window is narrowed over Modbus RTU (to a 10 Pa interval), and the 0-10 VDC signal (factory 0 V = -125 Pa, 10 V = +125 Pa) controls the extract fan speed.

    Application guide: how it is used in practice

    The HPS-F--LP adapts to different sites – only where the tubes are connected and where the signal is routed changes:

    Site What is connected Result Installer's note
    Clean room “+” – clean room, “–” – corridor / airlock Positive pressure is continuously monitored; on deviation, an alarm is sent to the BMS Set the alarm limits via Modbus RTU
    Stairwell overpressure Stairwell and adjacent space; AO1 → fan frequency converter The fan maintains the required overpressure Choose the response time according to the door opening dynamics
    Restaurant kitchen Kitchen and dining hall; AO1 → extract speed controller Negative pressure is maintained in the kitchen, so odors do not spread to the dining hall The bidirectional range also shows the sign
    Laboratory / isolator Room and corridor; Modbus → BMS Pressure difference and alarms are logged For non-aggressive, non-flammable gases

    How to choose the range of a pressure transmitter

    Measuring range / connection Recommended model
    -125…+125 Pa, 3-wire, 24 VAC/VDC HPS-G--LP (low ± pressure difference between rooms)
    -125…+125 Pa, 4-wire, 18–34 VDC HPS-F--LP (low ± pressure difference between rooms) ← this model
    0–1000 Pa, 3-wire, 24 VAC/VDC HPS-G-1K0 (filters, duct pressure, VAV)
    0–1000 Pa, 4-wire, 18–34 VDC HPS-F-1K0 (filters, duct pressure, VAV)
    0–2000 Pa, 3-wire, 24 VAC/VDC HPS-G-2K0 (universal AHU / fans)
    0–2000 Pa, 4-wire, 18–34 VDC HPS-F-2K0 (universal AHU / fans)
    0–4000 Pa, 3-wire, 24 VAC/VDC HPS-G-4K0 (higher-pressure fans)
    0–4000 Pa, 4-wire, 18–34 VDC HPS-F-4K0 (higher-pressure fans)
    0–10 000 Pa, 3-wire, 24 VAC/VDC HPS-G-10K (high-pressure industry)
    0–10 000 Pa, 4-wire, 18–34 VDC HPS-F-10K (high-pressure industry)
    Rule: The -125…+125 Pa range is intended for room pressure differences; for duct and filter pressure choose a 0–1000 Pa or higher model. The -G (3-wire) version suits 24 VAC or DC supply with a common GND; the -F (4-wire) version is DC only with separate GNDs, when the output GND must be isolated from the supply GND (e.g. in DC-powered networks with other devices). Do not mix -F and -G in the same network.
    When to choose another solution: with a display – DPS series; for two points – HPD (without display) or DPD (with display); connection kits PSET-PVC-200, PSET-QF-200, Pitot tubes PSET-PTS-200 / PSET-PTL-200; for Modbus configuration – CNVT-USB-RS485-SET converter; for 24 VDC power – SEPS8-24-40.

    Pros

    • Bidirectional range -125…+125 Pa, min. interval 10 Pa
    • Pressure, airflow and velocity in a single transmitter
    • 0-10 VDC / 0-20 mA / PWM output and Modbus RTU
    • Programmable working window, response time and alarm limits
    • Accuracy ±2 % of the operating range
    • IP65 ASA enclosure, aluminium nozzles

    Cons / limitations

    • No display – the value is visible only via Modbus or in the controller; with a display – DPS-F--LP
    • Only for clean air and non-aggressive, non-flammable gases; operating environment -5…+65 °C
    • Full configuration requires Modbus RTU (3SModbus / Sensistant) and a CNVT-USB-RS485 converter
    • DC powered only and connected with at least 4 wires; for 24 VAC power supply – HPS-G--LP
    • Range of only ±125 Pa – for ducts and filters choose HPS-F-1K0

    Safety and installation notes

    • Installation and connection are to be carried out by a qualified electrician / automation technician with the power disconnected.
    • Power supply 18–34 VDC only.
    • The -F version is not suitable for 3-wire connection: use at least 4 wires and do not connect the supply and output GND together – otherwise the measurement will be incorrect.
    • Do not use -F and -G type transmitters in the same network.
    • The transmitter is intended for clean air and non-aggressive, non-flammable gases only; operating environment -5…+65 °C, < 95 % rH non-condensing.

    Quick selection guide

    -125…+125 Pa
    0-10 VDC / 0-20 mA / PWM
    Modbus RTU
    18–34 VDC
    IP65
    Suitable when you need:
    • to measure the pressure difference within -125…+125 Pa and pass it to a controller or BMS;
    • to maintain and monitor room overpressure or negative pressure;
    • to integrate the measurement into a BMS via Modbus RTU.
    Check before use:
    • the maximum operating pressure – whether it fits within the -125…+125 Pa range;
    • the controller power supply and connection: 3 wires with a common GND (-G) or 4 wires with separate GNDs (-F);
    • whether airflow (fan K-factor) or velocity (Pitot kit) measurement will be needed.
    Important reminder: The HPS-F--LP measures only the pressure difference of clean air and non-aggressive, non-flammable gases; connection tubes and Pitot tubes are ordered separately.

    FAQ

    Can the HPS-F--LP be powered at 24 VAC?
    No – the -F version is powered only with 18–34 VDC; for 24 VAC power supply choose HPS-G--LP.
    Can the measuring range be changed?
    Via Modbus RTU the working window can be narrowed to a 10 Pa interval within the factory -125…+125 Pa range, but it cannot be widened.
    Does the transmitter measure airflow and velocity?
    Yes – airflow in m³/h from the fan K-factor or Q = A × V, and air velocity in m/s with the Pitot tube kit PSET-PTS-200 or PSET-PTL-200.
    Which signals will I get?
    A single output AO1 with a selectable 0-10 VDC, 0-20 mA or PWM signal and Modbus RTU communication.
    Does it have a display?
    No, there is no display – the same range with a display is the DPS-F--LP.
    How do I configure the transmitter?
    Via RS485 with the CNVT-USB-RS485 converter and the Sentera 3SModbus software or the Sensistant configurator.

    Differential pressure transmitter | -125...+125Pa | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VDC | 4-wire | IP65 | Sentera Controls | HPS-F--LP

    Sentera HPS-F--LP – differential pressure transmitter -125…+125 Pa, 0-10 VDC / 0-20 mA / PWM and Modbus RTU, 18–34 VDC, 4-wire, IP65 – for measuring small pressure differences between rooms or zones – cleanrooms, stairwell overpressure, negative pressure created by kitchens and laboratories.

    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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