Principles of Selection of Dynamic Pressure Sensors

Principles of Selection of Dynamic Pressure Sensors

In the field of fluid measurement, the conversion of physical signals (pressure, flow, temperature, etc.) into electrical signals (current, voltage, etc.) is often required in order to facilitate data analysis and in order to process data collection systems. Dynamic pressure sensors are one of the many applications that help improve system performance and product life. Dynamic pressure sensors are briefly described in the following areas:

Difference between Dynamic Pressure Sensors and Transmitters: 

The output signal is usually referred to as an early signal, e.g., mV signal, called a transducer. Taking the initial signal as a reference, the signal filter noise reduction and amplification processing, the output standard signal (4 ~ 20ma, 0 ~ 5v, etc.) for the transmitter. In the industrial field, the names of pressure sensor and pressure transmitter are usually mixed, usually referring to the pressure transmitter that outputs a standard signal. Some specialized fields specify the type of signal output to ensure the original state of the data.

Clear pressure measurement methods and pressure types

Measurement method:

Gauge Pressure Measurement: the reference pressure of the sensor is based on the local air pressure and is the most common measurement method where the cavity is communicating with the atmosphere.

Nodal Air Measurement: 

It is currently not possible to communicate with the atmosphere. For example, altitude cannot be measured by measuring local atmospheric pressure. This measurement method is based on vacuum zero.

Differential Pressure Measurement: 

This means that the difference in pressure between two manometers needs to be clarified as to which of the two measurement points is greater and what the maximum pressure is.

(Another form of sealing gauge pressure, special working conditions require this design)

Pressure types

Static pressure: 

Commonly used in industry where the pressure does not change significantly over a short period of time (e.g. maintenance and gas network pressure monitoring, etc.).

Dynamic pressure: 

Also known as temporary pressure. That is, the pressure fluctuates quickly and the data lasts for a short period of time (e.g., explosive shock, hydraulic pulsation, instantaneous pressure of cavitation collapse, wave strikes, changes in wind pressure on the surface of automobile operation and aircraft takeoff, etc.). Generally, the scientific research field requires temporary data analysis or monitoring of alarms that need to capture sudden changes in data.

Explicitly test measurement conditions.

Media Characteristics

State: 

liquid or gas, some gas measurement sensor can not be used for liquid measurement.

Viscosity: 

the fluidity of the medium requires the use of diaphragm pressure sensors, because high-viscosity fluids will block the sensor pressure measurement holes, making the measurement invalid.

Medium temperature range: 

the temperature of the pressure sensing surface of different sensors is different, or the temperature region of the measurement accuracy is different.

Corrosivity: 

to consider the compatibility of the medium and the sensor contact material.

Environmental Factors

Ambient temperature: 

The sensor is located in an abnormally high or low temperature environment, and it is necessary to consider whether the internal circuitry can withstand this temperature.

Flammable and explosive: 

Clearly defined explosion-proof requirements for pressure sensors, divided into intrinsically safe explosion-proof and explosion-proof, explosion-proof rating.

Vibration shock: 

The sensor should be specially designed to ensure robustness under vibration shock and normal data output.

Sources of interference: 

will produce high voltage, high-frequency electricity and other electromagnetic interference, the need for electrical isolation or grounding of the measurement system.

Clear measurement parameter requirements

1.Range

Before selecting the range, the ultimate pressure of the working conditions should be predicted with some margin to prevent overload damage. But it should not be exceeded too much. The range is usually selected about 2 times the conditioned pressure.

2.Accuracy

The accuracy of the data, i.e., the range of error between the measured data and the actual data. Accuracy of 1% for 100MPa, the actual value of 99 ~ 101mpa.

3.Power supply and output

Including sensors and sets of electrical and system adaptability, as well as the industry's commonly used 24VDC/4 to 20MA. most of the direct output voltage signals, plus watercolorizer.

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