.webp "Differential pressure measurement for Air Handling Units")
.webp "Differential pressure sensor for Air Handling Units")
.webp "Differential pressure transmitter for Air Handling Units")
.webp "Differential pressure meter for Air Handling Units")
.webp "Differential pressure detector for Air Handling Units")
.webp "Pressure sensor for Air Handling Units")
EU declaration conformity
Dual differential pressure transmitter | 0-4000 Pa | 24 VAC-VDC
Product description
The HPD series is a dual differential pressure sensor capable of measuring pressure in two separate locations simultaneously, within a range of 0 to 4,000 Pa.In addition to pressure, it can calculate air volume flow using the fan's K-factor and measure air velocity when connected to an external Pitot tube set.
The device is powered by a flexible 24 VDC or 24 VAC supply. It features two separate output channels, which can be configured as 0-10 VDC, 0-20 mA, or 0-100% PWM, and also supports Modbus RTU communication. All settings are fully adjustable via Modbus RTU.
Its IP65-rated, surface-mountable enclosure provides protection against dust and moisture, making it ideal for monitoring the supplied and extracted air volume in ventilation systems and Air Handling Units.
Additional specifications and description
What Can This Sensor Measure and Calculate Simultaneously?
This sensor measures differential pressure [Pa] in two different locations simultaneously. Based on the measurements, air volume flow [m³/hr] or air velocity [m/s] can be calculated. To calculate 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 measure differential pressure. To calculate 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. 
How Do the Analog Outputs Function?
This sensor has two analogue outputs. Each output transmits the measured differential pressure, air volume flow or air velocity proportionally. The default range of this sensor is 0 to 4.000 Pa. By default, each output transmits 0 V at 0 Pa and 10 V at 4.000 Pa. This range, the output types and all other settings can be adjusted via Modbus RTU.
This sensor has two analogue outputs. Each output transmits the measured differential pressure, air volume flow or air velocity proportionally. The default range of this sensor is 0 to 4.000 Pa. By default, each output transmits 0 V at 0 Pa and 10 V at 4.000 Pa. This range, the output types and all other settings can be adjusted via Modbus RTU.
How Can Measured Values Be Retrieved and Configured?
This sensor measures air volume flow in two different locations simultaneously. It can be used to monitor the supplied and extracted air volume in ventilation systems or Heat Recuperation Units (HRU).
What Are the Key Applications?
To obtain the measured value from this sensor, there are two options. Either read it from the Modbus registers or via the analogue output. The latter proportionally transmits the measured pressure difference, air flow or air velocity. The standard range of this sensor is 0 to 4.000 Pa. By default, the output is 0 V at 0 Pa and 10 V at 4 kPa. This range, output type (0-10 VDC / 0-20 mA / 0-100% PWM) and all other settings can be adjusted via Modbus RTU.
To obtain the measured value from this sensor, there are two options. Either read it from the Modbus registers or via the analogue output. The latter proportionally transmits the measured pressure difference, air flow or air velocity. The standard range of this sensor is 0 to 4.000 Pa. By default, the output is 0 V at 0 Pa and 10 V at 4 kPa. This range, output type (0-10 VDC / 0-20 mA / 0-100% PWM) and all other settings can be adjusted via Modbus RTU.
What Are the Power Supply and Wiring Details?
The supply voltage, both outputs and Modbus RTU communication can be connected via the screw clamp terminal block. This sensor 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, both outputs and Modbus RTU communication can be connected via the screw clamp terminal block. This sensor 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.
What Are the Sensor's Physical and Durability Features?
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 sensor 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 sensor can be wall-mounted.
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