Low range pressure measurement sensing devices.
- DMP331 Precision Pressure Transmitter - Stainless steel pressure transmitter with ranges from 100mbar up to 40 bar gauge or absolute. Special options for ATEX , SIL2 and compound ranges.
- DMP331P Hygienic Flush Pressure Transmitter - Sanitary pressure sensor wth exposed diaphragm with no crevices for high temperatures up to 300 Degrees Celsius in ranges from 100mb up to 40 bar gauge or absolute
- DMP457 Marine Approved Pressure Transmitter - Marine approved stainless steel diaphragm pressure transmitter with 4-20mA current loop output for shipbuilding in ranges from 100mb to 600 bar gauge or absolute.
- DPS200 HVAC Differential Pressure Transmitter - Differential air pressure sensor with a 10 volt or a 4-20mA output for building ventilation applications. Ranges from 0 to 6 mbar up to 0 to 1000 mbar.
- DMP343 Low Range Pneumatic Pressure Sensor - DMP343 pneumatic pressure sensor for measuring very low range pressures on pneumatic control systems, heating, ventilation and air conditioning systems (HVAC) .
- PrimAtü 10 Low Cost Low Range Differential Air Pressure Transducer - The PrimAtü 10 low cost low range differential air pressure transducer can detect and display both positive and negative differential pressure variations of very low low pressure ranges from 0.5 up to 1000 mbar/hPa, and output the pressure as a 4-20mA, 0-20mA or a 0-10Vdc analog output.
Measuring low range pressures is typically necessary on systems that transport air or gases such as building ventilation and factory dust or fume extraction.
In order to move air or gas from one place to another, a differential pressure difference needs to be created which causes movement in the direction of higher to lower pressure. Only a relatively small difference in pressure is needed to create sufficient movement of air or gas, which is a good thing because too high a differential would cause problems with noise and opening of doors in a workplace environment.
The size of low pressure measuring devices tends to be larger than equivalent higher range ones, this is because lower pressures produce less deformation in the sensing material, and therefore a larger surface area is required to maintain sensitivity of measurement. A thinner material is also used, but this is often limited by the technology and strength of the active material.
Due to the larger surface area and thinner sensing material used in low pressure sensing devices, it is necessary to downgrade the accuracy performance compared to higher ranges, because they are more sensitive to external environmental influences such as vibration and temperature changes.
Pressure units which are used to describe low pressure ranges include pascals (Pa), millibars (mbar, mb), hectopascals (hPa) or inches of water column (inH2O, inWC, inWG, “H2O, “WC, “WG).
Pressure sensors are measurement devices for detecting variations in pressure of liquids or gases. Typically a pressure sensor is made of two subcomponents, an electromechanical assembly on the frontend, and a signal conditioning module on the backend.
The frontend of the pressure sensor is connected directly via a thread or clamped seal to a pipe or vessel containing the liquid or gas to be measured. The pressure generated by the liquid or gas will apply a force to a sensitive exposed surface area within the electromechanical assembly which produces a physical change to the material, such as a deformation. This physical change is translated into an electrical change by smaller elements incorporated into the sensitive part of the assembly, typically on the reverse side of the surface in contact with the liquid or gas.
Since there are many different types of electromechanical technology used to measure pressure, producing very different electrical characteristics, it is necessary to add on a signal conditioning module to rationalise the electrical signal and convert it to one which is a commonly used standard within a particular industry or application.