Differential pressure measurement
-Continuous level, flow and differential pressure measurement
Types of Differential Pressure Gauges
Sino-Instrument offers differential pressure gauges with an assortment of housing materials, wetted parts, dial sizes, connection types, mounting configurations, and custom dial artwork. The three design options – piston-style, dual diaphragm, and the all-welded/all stainless steel – are suitable for different applications and include distinct features.
What is Differential Pressure?
Differential pressure, or DP or ∆p, is simply the difference between two applied pressures. For example, if the pressure at point A equals 100psi and the pressure at point B equals 60psi, then the differential pressure is 40psi (100psi – 60psi).
A differential pressure gauge is a visual indicator, designed to measure and illustrate the difference between two pressure points within a process system. The gauge usually has two inlet ports that are each connected to the pressure points being monitored. A differential pressure gauge simplifies the process by finding the difference between the points. Without this differential pressure gauge, an operator or control system would need to watch two separate gauges and determine the difference in readings.
Differential pressure gauges, typically found in refineries, petrochemical plants, and chemical plants,
are used to monitor filtration, liquid levels, and liquid flow.
What is a Differential Pressure Transmitter?
The most common and useful industrial pressure measuring instrument is the differential pressure transmitter. This equipment will sense the difference in pressure between two ports and produce an output signal with reference to a calibrated pressure range.
The industrial differential pressure transmitters are made of two housings. The pressure sensing element is housed in the bottom half, and the electronics are housed at the top half. It will have two pressure ports marked as “High” and “Low”. It is not compulsory that the high port will be always at high pressure and the low port always at low pressure. This labeling has its relation to the effect of the port on the output signal.
Differential pressure measurement: Measuring Principle
Silicon cell: The operating pressure deflects the process isolating diaphragm and a fill fluid transfers the pressure to a resistance bridge (semiconductor technology). The pressure-dependent change in the bridge output voltage is measured and evaluated.
Diaphragm seal: The operating pressure acts on the process isolating diaphragm of the diaphragm seal and is transferred to the process isolating diaphragm of the sensor by a fill fluid.
Benefits of DP measurement
Universal DP transmitter for flow, level or filter applications
With diaphragm seal process temperatures from -70 up to +400°C (-94 to +752°F)
The electronic differential pressure system eliminates traditional mechanical issues resulting in greater process availability and reliability. Also, safety risks are minimized with the electronic DP system architecture and design
Industrial applications of Differential Pressure Transmitters:
There are unlimited industrial applications of Differential Pressure Transmitters.
Oil and Gas flow metering in onshore, offshore and subsea applications.
Water and effluent treatment plants. It is largely used to monitor filters in these plants.
It is used to monitor Sprinkler Systems.
Remote sensing of Heating Systems for Steam or Hot Water.
Pressure drops across valves can be monitored.
Pump control monitoring.
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