Pressure transmitters, also known as pressure sensors or pressure transducers, are used to measure and convert pressure into an electrical signal. There are various types of pressure transmitters available, each suitable for different applications and pressure ranges. Here are some common types of pressure transmitters:
- Strain Gauge Pressure Transmitter: This type of pressure transmitter uses a strain gauge as a sensing element. The strain gauge changes its resistance in response to the applied pressure, and this change is converted into an electrical signal proportional to the pressure.
- Capacitive Pressure Transmitter: Capacitive pressure transmitters utilize a diaphragm that deflects under the applied pressure, causing a change in capacitance. The variation in capacitance is measured and converted into an electrical signal representing the pressure.
- Piezo resistive Pressure Transmitter: Piezo resistive pressure transmitters employ a diaphragm with integrated resistors. The resistors change their resistance when subjected to pressure, and this resistance change is converted into an electrical signal proportional to the pressure.
- Vibrating Element Pressure Transmitter: Vibrating element pressure transmitters use a resonating element such as a tuning fork or vibrating wire. The pressure-induced changes in the resonating element’s frequency or amplitude are measured and converted into an electrical signal reflecting the pressure.
- Differential Pressure Transmitter: Differential pressure transmitters measure the difference in pressure between two points. They typically consist of two pressure ports and a sensing element that measures the pressure difference across the ports. These transmitters are commonly used in applications such as flow measurement, filtration systems, and level measurement.
- Absolute Pressure Transmitter: Absolute pressure transmitters measure the pressure relative to an absolute vacuum reference. They provide the absolute pressure value, including atmospheric pressure.
- Gauge Pressure Transmitter: Gauge pressure transmitters measure the pressure relative to atmospheric pressure. They do not account for the atmospheric pressure and provide the pressure value above or below atmospheric pressure.
- Sealed Pressure Transmitter: Sealed pressure transmitters are designed to measure pressure within a sealed system or enclosure. They are often used in applications where the pressure measurement needs to be isolated from the external environment.
- Submersible Pressure Transmitter: Submersible pressure transmitters are specifically designed for measuring pressure in liquid environments. They are typically sealed and suitable for applications such as water tanks, wells, and submersible pumps.
The selection of the appropriate type depends on factors such as the pressure range, accuracy requirements, compatibility with the measured medium (gas or liquid), environmental conditions, and specific application needs.