Addressing The Question “What Is A Pressure Transducer?”

There are several different types of pressure transducers. However, before explaining the types and styles currently available, one question should be answered. What is a pressure transducer?

Broken down into simple terms, a pressure transducer reads the pressure applied to a sensor and translates it into an analog electrical reading. They are most often utilized to test the pressure applied by gases or liquids when under specific conditions. They are widely used by manufacturers of aeronautical equipment and undersea vehicles. Readings can be taken under a range of conditions, including in a vacuum or when the substance being tested is under extreme temperatures. The measurements are then recorded onto data loggers.

The most common transducer is called a strain gage transducer. Its name describes its action succinctly. Pressure is applied to a diaphragm, which places strain on the gages. This produces an electrical signal that equates to the pressure.

Output is in the form of analog electrical signals, but can be measured in three different ways. Millivolt transducers are the cheapest and are commonly used when the span involved is short. They are not suitable for an area that has much electrical noise, and do not perform properly if the power supply is inconsistent.

Voltage transducers are not as sensitive to external elements such as electrical noise. They also do not require the same degree of consistent power supply. The last type is a 4-20 mA output. This is often referred to as a pressure transmitter. They are vital if lead wires must be run a great distance, as they can handle leads of 1,000 feet or more. Power fluctuations and electrical noise are also not of major importance to them.

Pressure transducers are further categorized based on other factors. The type of sensor and type of pressure is one indicator. Absolute sensors test in a true absolute vacuum. Gauge sensors test relative pressure. Differential pressure sensors test the difference between two or more pressures. And a sealed sensor is calibrated and then sealed to measure pressure in terms of a known pressure, usually at sea level.

Further categorizations place transducers in either the force collector group or a group of all other types. Force collectors measure pressure applied to a piston or diaphragm. The second category registers changes in thermal capacity or resonance. These can take readings over extended time periods and normally measure changes in density when a gas is placed under pressure. Examples of force collectors are strain gage transducers which are normally used to test differentials and to take measurements in a vacuum. Capacitive transducers have both a diaphragm and a pressure cavity and are usually applied for low pressure tests. Piezoelectric transducers use materials such as quartz for sensors and can register high speed pressure changes, making them ideal for measuring automobile engine combustion.

Anyone asking, “What is a Pressure Transducer?” may also wonder about some of their applications. They are important tools to manufacturers of aircraft, automobiles, weather instruments, and satellites. From rockets to weather balloons, pressure transducers are used to measure the effects of changes in air pressure. They are also used to help submarines measure depth. In addition, several industries use them to test pressurized systems for leaks.

If you are looking for calibration services or even humidity sensors for your company, look no further! We offer competitive rates and the largest selection of fine measurement and test tools.