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  • New item   -120.75€Dual differential pressure transmitter | 2×0-1000Pa | 2×0-10VDC/0-20mA/PWM | Modbus RTU | 24VAC/VDC | 3-wire | IP65 | Sentera Controls | HPD-G-1K0
    New item   -120.75€Dual differential pressure transmitter | 2×0-1000Pa | 2×0-10VDC/0-20mA/PWM | Modbus RTU | 24VAC/VDC | 3-wire | IP65 | Sentera Controls | HPD-G-1K0 1
    New item   -120.75€Dual differential pressure transmitter | 2×0-1000Pa | 2×0-10VDC/0-20mA/PWM | Modbus RTU | 24VAC/VDC | 3-wire | IP65 | Sentera Controls | HPD-G-1K0 2
    New item   -120.75€Dual differential pressure transmitter | 2×0-1000Pa | 2×0-10VDC/0-20mA/PWM | Modbus RTU | 24VAC/VDC | 3-wire | IP65 | Sentera Controls | HPD-G-1K0 3
    New item   -120.75€Dual differential pressure transmitter | 2×0-1000Pa | 2×0-10VDC/0-20mA/PWM | Modbus RTU | 24VAC/VDC | 3-wire | IP65 | Sentera Controls | HPD-G-1K0 4

    Dual differential pressure transmitter | 2×0-1000Pa | 2×0-10VDC/0-20mA/PWM | Modbus RTU | 24VAC/VDC | 3-wire | IP65 | Sentera Controls | HPD-G-1K0

    Code: HPD-G-1K0
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  • Product description

    Dual differential pressure transmitter | 2×0-1000Pa | 2×0-10VDC/0-20mA/PWM | Modbus RTU | 24VAC/VDC | 3-wire | IP65 | Sentera Controls | HPD-G-1K0

    HPD-G-1K0 – a Sentera Controls dual differential pressure transmitter with a factory measuring range of 0–1000 Pa. It integrates two independent digital differential pressure sensors and two analog / modulating outputs: 0-10 VDC, 0-20 mA or 0–100 % PWM signal, and Modbus RTU communication. The -G version – for 3-wire connection with a common supply and output “minus”, powered by 24 VAC or 24 VDC; IP65 enclosure, wall-mounted.

    Key idea:
    Two pressure points – one housing: e.g. fan pressure and filter fouling, supply and extract sides or two zones are measured with a single device, with two independent outputs and a common Modbus RTU line. This means less installation, wiring and space in the ventilation unit.
    Measuring range
    2 × 0–1000 Pa (factory default)
    Output
    2 × 0-10 VDC / 0-20 mA / PWM + Modbus RTU
    Power supply
    24 VAC / VDC (18–34 VDC, 15–24 VAC ±10 %)
    Protection class
    IP65, ASA enclosure

    Operating principle

    The transmitter is mounted on a wall or other solid surface near the measuring points, and the measuring points are connected with tubes to the aluminium “+” and “–” nozzles (for a 6 mm tube) – separately for each of the two sensors. For connection, the Sentera PSET-PVC-200 or PSET-QF-200 kits are convenient; for air velocity – the Pitot tube kits PSET-PTS-200 / PSET-PTL-200.

    Each of the two integrated digital sensors 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 0 Pa, 10 V at 1000 Pa. Over Modbus RTU (the 3SModbus application or the Sensistant configurator) the working window (min. interval 50 Pa for pressure, 10 m³/h for flow, 1 m/s for velocity), output type and response time of 0.1–10 s are set. The status and communication are shown by LED indicators.

    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 0–1000 Pa range is the most common choice for filter fouling and duct pressure in commercial ventilation systems where the operating point is a few hundred Pa.

    Benefits HPD-G-1K0?
    One device – pressure, flow and velocity measurement, analog and Modbus RTU output, programmable range, two independent channels and an IP65 housing. A single model in stock is enough for many sites.

    Technical specifications

    Product type Dual differential pressure transmitter
    Manufacturer / code Sentera Controls / HPD-G-1K0
    Series HPD (-F / -G; 0–1000 Pa, 0–2000 Pa, 0–4000 Pa, 0–10 000 Pa)
    Number of sensors 2 (independent digital)
    Measuring range 0–1000 Pa per sensor (factory default)
    Operating modes Differential pressure, airflow (K-factor or Q = A × V), air velocity (with PSET-PTX-200)
    Min. operating interval 50 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 and AO2 – one per sensor: 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 0 Pa, 10 V at 1000 Pa
    PWM power supply Internal 3.3 or 12 VDC (jumpers JP1/JP2) or external via a pull-up resistor
    Communication Modbus RTU (RS485, A, /B); configuration with 3SModbus or Sensistant
    Supply voltage 18–34 VDC or 15–24 VAC ±10 %
    Consumption max. 1.17 W, Imax 65 mA (DC); max. 2.88 W, Imax 160 mA (AC)
    Connection 3-wire, common supply and output GND (-G)
    Terminals Vin, GND, A, /B, AO1, GND, AO2, GND
    Buttons / indication SW1 and SW2 – calibration of each sensor or resetting the Modbus registers; LED: blinking blue – calibration / reset, blinking green – Modbus communication, steady – normal operation
    Pressure nozzles Aluminium, for Ø6 mm tube
    Wire cross-section 1.5 mm²; cable gland 3–6 mm
    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 0.14 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

    Manufacturer documentation

    ✔ Recommended by Elektrotechnikos sprendimai

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

    Main functions

    • Two independent channels – two pressure points with separate outputs AO1 and AO2 – one transmitter instead of two.
    • 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 50 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 / SW2 – quick zero check on site, and also resetting the Modbus registers to factory defaults.
    • 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.
    • 24 VAC or DC power supply – 3-wire connection with a common GND – the transmitter is easy to connect to a 24 VAC control transformer or an 18–34 VDC source.

    Where is it used?

    • Two measuring points at the same time – e.g. fan and filter, supply and extract
    • Filter fouling monitoring in ventilation units
    • Maintaining constant pressure in a duct (VAV systems)
    • Airflow measurement via the fan K factor
    • Air velocity measurement in a duct with a Pitot tube
    • Ensuring minimum ventilation rates in buildings
    • Clean rooms, kitchens, laboratories – pressure monitoring

    On-demand operation

    For ventilation unit service technicians.
    two 0–1000 Pa channels monitor the supply and extract filters simultaneously, so replacement is planned according to the actual pressure drop.
    For the control panel manufacturer.
    two independent channels with outputs AO1 and AO2 in a single enclosure reduce the number of sensors, wires and installation work.
    For installers with a 24 VAC control transformer.
    The -G version is wired with 3 wires with a common GND and powered at 15–24 VAC or 18–34 VDC.

    Practical application

    If in a ventilation unit the filter has to be monitored and constant duct pressure maintained at the same time, then one channel of the HPD-G-1K0 is connected before and after the filter and the other to the duct; AO2 with the factory scale 100 Pa = 1 V controls the fan controller, while AO1 or Modbus RTU reports filter contamination to the BMS.

    Application guide: how it is used in practice

    The HPD-G-1K0 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
    Air handling unit Sensor 1 – fan pressure, sensor 2 – filter; AO1 → controller, AO2 → BMS One transmitter controls the fan and monitors the filter Each channel is configured separately
    Air handling unit filter Tubes upstream and downstream of the filter; AO1 or Modbus → BMS When the filter becomes clogged – an alarm and timely planned replacement Narrow the working window to the filter pressure limits
    Constant pressure in the duct Duct point and environment; AO1 → Sentera speed controller / frequency converter / EC fan Fan speed is varied so that the pressure stays constant Increase the response time if the signal pulsates
    Airflow measurement Measuring points at the fan inlet nozzle (PSET-PVC-200) The transmitter displays and transmits m³/h according to the K-factor You will find the K factor in the fan documentation
    Air velocity in the duct Pitot tube PSET-PTS-200 / PSET-PTL-200 Measured in m/s, flow is calculated as Q = A × V Install the Pitot tube in a straight section of the duct
    Building with BMS Modbus RTU (A, /B) Values and settings are managed centrally Do not mix -F and -G versions in the same network

    How to choose the range of a dual pressure transmitter

    Measuring range / connection Recommended model
    0–1000 Pa, 3-wire, 24 VAC/VDC HPD-G-1K0 (filters, duct pressure, VAV) ← this model
    0–1000 Pa, 4-wire, 18–34 VDC HPD-F-1K0 (filters, duct pressure, VAV)
    0–2000 Pa, 3-wire, 24 VAC/VDC HPD-G-2K0 (universal AHU / fans)
    0–2000 Pa, 4-wire, 18–34 VDC HPD-F-2K0 (universal AHU / fans)
    0–4000 Pa, 3-wire, 24 VAC/VDC HPD-G-4K0 (higher-pressure fans)
    0–4000 Pa, 4-wire, 18–34 VDC HPD-F-4K0 (higher-pressure fans)
    0–10 000 Pa, 3-wire, 24 VAC/VDC HPD-G-10K (high-pressure industry)
    0–10 000 Pa, 4-wire, 18–34 VDC HPD-F-10K (high-pressure industry)
    Rule: choose the range so that the maximum operating pressure is about 50–80 % of the upper limit – the working window can be narrowed via Modbus RTU, but not widened. The -G (3-wire) version suits 24 VAC or DC supply with a common GND; -F (4-wire) – DC only with separate GNDs, when the output GND must be separated from the supply GND (e.g. in DC-powered networks with other devices). Do not mix -F and -G on the same network.
    When to choose another solution: with a display – DPD series; for a single point – HPS (without display) or DPS (with display); for small room pressures – HPS-x--LP / DPS-x--LP (-125…+125 Pa); 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

    • Two independent sensors and outputs in one housing
    • Pressure, airflow and velocity in a single transmitter
    • 0-10 VDC / 0-20 mA / PWM output and Modbus RTU
    • Programmable working window and response time
    • 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 – DPD-G-1K0
    • 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
    • The common GND of -G must not be connected to other DC-powered devices; in that case choose HPD-F-1K0
    • There is no -125…+125 Pa version – for room pressure differential choose HPS-G--LP

    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 or 15–24 VAC ±10 % (the terminal table specifies AC as 13–26 VAC); use a safety transformer or a power supply.
    • Never connect the common GND of the -G version to other DC-powered devices – they may be irreversibly damaged.
    • 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

    2 × 0–1000 Pa
    0-10 VDC / 0-20 mA / PWM
    Modbus RTU
    24 VAC/VDC
    IP65
    Suitable when you need:
    • to measure two pressure points with a single device;
    • to measure the pressure difference within 0–1000 Pa and pass it to a controller or BMS;
    • to maintain a constant pressure or flow by controlling a fan;
    • to integrate the measurement into a BMS via Modbus RTU.
    Check before use:
    • the maximum operating pressure – whether it fits within the 0–1000 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 HPD-G-1K0 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 HPD-G-1K0 be powered at 24 VAC?
    Yes – the -G version is powered with 15–24 VAC ±10 % or 18–34 VDC and connected with 3 wires with a common GND.
    Can the measuring range be changed?
    Via Modbus RTU the working window can be narrowed to a 50 Pa interval within the factory 0–1000 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?
    Two outputs AO1 and AO2 (one for each sensor) 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 DPD-G-1K0.
    How do I configure the transmitter?
    Via RS485 with the CNVT-USB-RS485 converter and the Sentera 3SModbus software or the Sensistant configurator.

    Dual differential pressure transmitter | 2×0-1000Pa | 2×0-10VDC/0-20mA/PWM | Modbus RTU | 24VAC/VDC | 3-wire | IP65 | Sentera Controls | HPD-G-1K0

    Sentera HPD-G-1K0 – dual differential pressure transmitter 0–1000 Pa with two channels, 0-10 VDC / 0-20 mA / PWM and Modbus RTU, 24 VAC/VDC, 3-wire, IP65 – for filter fouling monitoring, maintaining constant duct pressure and measuring airflow in small and medium ventilation systems.

    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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