Verschildruktransmitter | 0 tot 2 kPa | 24 VDC

€ 147,69

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00sinds 10 jan. '25, 08:40

Beschrijving

This HVAC sensor with display measures the differential pressure within the range of 0 to 2 kPa. In addition, you can also measure the air flow or air velocity with it. The measured value is available via the analog output and via Modbus RTU communication. The output type of the analog output is selectable between 0-10 VDC, 0-20 mA or 0-100% PWM. The four LED indicators provide a visual indication of the status of the device and of the measured values. The range and all other settings can be adjusted via Modbus RTU. This device operates on 24 VDC supply voltage.

Measure or control?This sensor's output signal will increase proportionally within the set range. If it were e.g. CO2 or relative humidity, then it is perfectly possible to control e.g. a valve or a fan in this way. The more CO2, the more ventilation. Or the more moisture, the further the extractor valve opens.However, when it comes to differential pressure, it is unlikely that proportional control is used. Usually, pressure control does not operate within a range , but rather at a set value , a "set point". A differential pressure controller will then, for example, control a fan in such a way that the set point is maintained.Since this device does not have a set point (but does have a range), it is not a controller, but a sensor or transmitter . They are usually used to transmit the measured values to an external control or regulation system.Differential pressure, air volume flow or air velocity?
Technically, this sensor only measures the differential pressure [Pa]. However, based on this measurement, the device itself can calculate the air flow [m³/h] or the air velocity [m/s].To work with air flow [m³/h] there are 2 options:

Or you have the K-factor of your fan. In that case, it is sufficient to enter that value in the Modbus register provided for that purpose. Furthermore, you simply perform a pressure measurement. So with the help of the connection sets PSET-PVC-200 or PSET-QF-200. The air flow is calculated automatically and you can read it out via the Modbus registers.
If you do not have the K-factor of your fan, or the setup does not allow you to use it reliably, there is also the possibility to perform an air velocity measurement. This is usually easier to perform. For this you will need a PITOT tube connection set: PSET-PTS-200 or PSET-PTL-200 . Because you are measuring the air velocity [m/s], it is necessary to enter the duct cross-section [cm²] in Modbus, after which you can read out the air flow [m³/h] again via Modbus.

7-segment LED display
The 7-segment LED display shows the differential pressure, air volume or air velocity. In addition, this differential pressure transmitter has clear green, yellow and red LEDs. The green LED indicates that the measured value is within the set range . When the measured value is within the warning range , the yellow LED lights up. And red means that the value is out of range . The second green LED indicates the sensor status. It is activated when the power supply and Modbus RTU communication are turned on. Analogue output and Modbus
To know the value measured by this sensor, there are 2 possibilities. Either you read it out in the Modbus registers, or you read it out via the analogue output. This proportionally transmits the measured pressure difference, the air flow or the air speed. The standard range of this sensor is 0 to 2,000 Pa. By default, the output sends 0 V at 0 Pa and 10 V at 2 kPa. This range, the output type (0-10 VDC / 0-20 mA / 0-100% PWM) and all other settings can be adjusted via Modbus RTU.Reduced installation time
The power supply, analog output and Modbus RTU communication are connected via the terminal block with spring clamps. This eliminates the need for routine checks and guarantees reliable contact. For both stranded and hard core wires.The device operates on 24 VDCThe grounds of the power supply (V-) and output (GND) are not internally connected. This means that a 4-wire cable is required to connect this sensor. Most 24 VDC power supplies offer short circuit and overload protection. A 24 VDC supply voltage increases the safety and reliability of your installation. Be sure to also check out the Sentera power supplies.High-quality housing
The housing is made of high-quality r-ABS VO (UL94) plastic. This material is heat-resistant and offers good protection against impacts. The connections for the pressure lines are made of aluminum. The housing offers IP65 protection against the ingress of dirt and water. This sensor can be mounted on the wall.