The pressure transducer, which is often known also as a pressure transmitter, converts pressure into an analog electrical output signal. There are a lot of different types of pressure transducers available in today’s market. One of the most common is the pressure transmitter ANDDT1.
Before giving you more details about its best use-cases, we would like to tell you more about how it works. The conversion of pressure into an electrical signal is achieved by the physical deformation of strain gauges which are bonded into the diaphragm of the pressure transducer and wired into a Wheatstone bridge configuration. Pressure applied to the pressure transducer produces a deflection of the diaphragm which introduces strain to the gages. The strain will produce an electrical resistance change proportional to the pressure.
1. Pressure transducer use cases
There is two most common implementation of pressure transducer ANDDT1 where it measures low-pressure or high-pressure. Let us tell you more what’s the difference.
LOW-PRESSURE USE CASE
By measuring the low-pressure in the water pipeline with the pressure transducer ANDDT1 we can prevent the heat pump before dry-running. Dry-running can lead to system overheating which leads to heat pump failure.
Heat pump failure is not just a very expensive expense, but also very dangerous. It can cause several other problems, like for example damage to electrical wiring, failure of other systems which rely on heat pump, etc. Measuring a low-pressure in the pipelines is therefore much more important than measuring the high-pressure while talking about the system failure.
Example of heat pump mounting 10m above the water level:
With a precise installation and extended automation of the pressure transmitter, it can for example send a notification to our mobile phone or email if the pressure drop below 0,8 bar and completely stop the heat pump in the case if the pressure drop below 0,3 bar.
HIGH-PRESSURE USE CASE
The high-pressure can also do a lot of damage to the heat pump’s transmission. How can this happen? Most of the time that means that the heat pump has been in the use for some time and the high-pressure indicates that it has to be cleaned. Technicians will therefore stop the heat pump and do a required service. After the clean-up and repair, the heat pump’s high-pressure and the flow should drop back to normal.
In this case, the pressure transmitter ANDDT1 has to be installed as close to the transmission as possible. Otherwise, the indication could be a bit off.
2. Modbus pressure transmitter
What are the main benefits of the Modbus pressure transducer? Mostly that it can be used and installed into existing Modbus building automation. The controller will therefore be able to read the measurements over the Modbus protocol and process them accordingly to the specific needs which are programmed and executed from it’s controlled.
How to convert the standard pressure transmitter with an output signal 0-10V into the Modbus pressure transmitter? Well, we need the following:
1x Pressure transmitter ANDDT1
If the sensor is connected to U-MIO’s digital input, the U-MIO can convert that signal to Modbus. The input-output unit U-MIO can be then connected to any Modbus controller. We usually use controller U-DDC.
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