Verschildruktransmitter | 0 tot 2 kPa | PoM-voeding

€ 124,35

00sinds 30 dec. '24, 13:10

Kenmerken

ConditieNieuw

Beschrijving

This Modbus HVAC sensor measures the differential pressure within the range of 0 to 2 kPa. In addition, you can also measure the air flow or air speed with it. The measured value is only available via Modbus RTU. The sensor is equipped with an RJ45 connector through which both the 24VDC and data communication take place. Because there is no digital-to-analog conversion, the sensor is cheaper to purchase and it also makes it extremely suitable for inclusion in your Modbus network. 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.

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.

Visual indication
This differential pressure transmitter provides a clear visual indication of the differential pressure, air velocity or air flow level via the 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 and Modbus RTU communication are switched on.Power over Modbus
Sentera developed the Power over Modbus (PoM) concept to reduce costs, increase reliability, and simplify cabling in Modbus networks. So, for example, as soon as multiple sensors are in the same network, they can use the same power supplies, converters, gateways, etc. For this purpose, most Sentera products are available in a PoM version that is equipped with one or more RJ45 connections.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.