When looking for pressure measurement equipment, you'll find plenty of options. At first glance, pressure sensors, pressure switches, and pressure transmitters may seem very similar, but they are very different in their methods of use and design principles.

Pressure Sensors (Pressure Transmitters)

Pressure sensors are also known as pressure transmitters, and switches can be referred to as "pressure sensors". A pressure sensor consists of a pressure-sensitive element and electronics that can measure, detect, or monitor pressure and convert the information into an electrical output signal. As we know, pressure is the amount of force exerted over an area. Pressure sensors use piezoresistive technology, in which a piezoresistive element responds to pressure, changing its resistance.

Apply a pressure sensor

Industrial applications rely heavily on pressure sensors to control processes and maintain quality, and the industrial market covers a wide range of applications from very low vacuum, very low pressure, to high pressure.

The following are examples of applications where pressure sensors are currently used:

Energy Savings – To achieve greater energy savings, accurate pressure sensors are needed to measure portable and stationary weather stations, diesel truck emissions test equipment, and wind energy systems.

Automotive Applications – Passenger safety is largely dependent on the hydraulic brakes in the car. It requires a complex combination of components, such as pressure sensors, to control the vehicle and its brakes. When the pressure is too low and not working properly, the pressure in the braking system cavity can be monitored, alerting the driver and the engine management system.

Medical applications – Drugs are usually delivered in the form of liquids. The infusion pump is delivered intravenously, subcutaneously, or directly to a vein. Pumps use sensors, including instrumentation and differential pressure sensors, to ensure that the right flow is administered at the right speed.

Pressure switches and transmitters

The most common misconception about pressure transmitters (pressure sensors) and pressure switches is that they are the same, but they serve very different purposes. While both types measure pressure, pressure sensors have a continuous output and are typically connected to a controller that monitors and responds to pressure. In contrast, a pressure switch is a simple device that does not provide a continuous output. Just like a light switch, it has a switch function. Pressure switches are designed to open or close circuits when pressure rises and falls within the system.

What kind of sensors are needed?

Sensors and switches are used in different applications. Switches are widely used in vehicles as a way to indicate low engine oil pressure, and are also widely used in gas compressors with automatic shut-off function. Transmitters are beneficial for critical areas and industrial applications where system trend information is required for high accuracy, feedback and control, alarm conditions, and critical areas.

While pressure switches and sensors may seem to achieve the same goal at first glance, they have completely different methods of achieving their goals. Pressure sensors, on the other hand, are used for more complex purposes such as monitoring, predictive analytics, or process control.