Electrical output of pressure sensor
Pressure sensors generally have three types of power outputs: millivolts, amplified voltages, and 4-20mA. Below is a summary of these outputs and their best uses.
Millivolt output pressure sensor
Millivolt output sensors are usually the most economical pressure sensors. Its output is nominally about 30mV. The actual output is proportional to the input power or excitation of the sensor. If the incentive fluctuates, the output will also change. Because of this dependence on the excitation level, it is recommended to use a regulated power supply with a millivolt sensor. Because the output signal is extremely low, the sensor should not be located in an electrical noise environment. The distance between the sensor and the reading instrument should also be kept relatively short.
Voltage output pressure sensor
Voltage output sensors contain overall signal regulation and provide much higher output than millivolt sensors, typically 0-5Vdc or 0-10Vdc. Although specific models vary, the output of the sensor is usually not a function of excitation. This means that an unregulated power supply is sufficient as long as it is within the specified voltage range. Because they have a high level of output, they are not as susceptible to electrical noise as millivolt sensors, so they can be used in more industrial environments.
4-20 mA output pressure sensor
These types of sensors are also called pressure transmitters. Since the 4-20mA signal is minimally affected by electrical noise and the resistance of the signal line, this sensor is most suitable for the long-distance transmission of signals. They are often used in applications with leads over 1000 feet.
Selective pressure sensor
Still wondering how to determine what type of pressure sensor or pressure transmitter you need? To learn more about the criteria to consider when making a decision, this article, Practical Considerations when choosing a pressure sensor will help you choose the right device for your application. .
