What is the Maximum Line Pressure?
This is the highest pressure that can be applied to both pressure connectors at the same time. If a differential pressure exists between two pressure connections, the total pressure on the high/positive side would be considered for the purposes of assessing line pressure. The line pressure is an indicator of the mechanical integrity of all materials, welds and seals used in the construction of the transmitter.
What is Maximum Overpressure?
This is the highest permittable pressure difference without damaging functionality or integrity of the transmitter. Some overpressure specifications will also include a "no effect on performance" statement. Some overpressure ratings are directional, typically the positive overpressure rating will be higher than the negative side.
What are Mechanical Stops?
This is a feature incorporated into the mechanical assembly which protects sensitive components from a significant overpressure condition. The mechanical stop is typically a metal face positioned behind a diaphragm. If an overpressure limit is exceeded the diaphragm will butt up against the mechanical stop which will prevent it from traveling too far. A mechanical stop will normally be incorporated on both sides of the sensing diaphragm to protect the transmitter from an overload condition in either direction. This is particularly useful for installations where there is the risk of accidentally disconnecting one side of the differential pressure transmitter.
What is a Square Root Extraction Output?
Differential pressure sensors are often used to indirectly measure flow. The relationship of flow to differential pressure is a square root function. In order to improve resolution at the lower end of the pressure range where there is a larger change in flow, a square root extraction will provide a modified output which is linear with flow rather than pressure.
What does Bidirectional Measurement mean?
The output signal is scaled over a pressure range which can vary by an equal amount in the positive and negative direction, e.g. -15 to +15 mbar = 0 to 10 Volts dc.
What does Wet/Wet mean?
Both positive and negative side pressure ports are compatible with liquids
What does Dry/Dry mean?
Both positive and negative side pressure ports are only compatible with dry gases.
What does Wet/Dry mean?
The positive side pressure port is compatible with liquids whereas the negative side is only compatible with dry gases.
Can Differential Pressure Sensors be used for measuring Suction Pressure?
Yes, if the sensor has a positive range connect the negative side port to the suction pressure and leave the positive port open to ambient air pressure.
If you would like assistance in selecting a differential pressure sensor please complete this form.
0 comments:
Post a Comment