Pressure Transducers: Types and Application

Pressure transducers or transmitters are equipment used to convert pressure change into proportional standard (digital or analog) output signals. There are many types of pressure transducers; however, what we specialize in are piezoresistive pressure transducers. Other devices like alarms, closed-loop systems, and controllers use the information the devices provide for a wide range of uses.

Users apply the equipment to various uses in industrial and residential applications requiring pressure measurements like chemicals, oil and gas field, water treatment, aircraft, HVAC, etc. The pressure transducers have a pressure-sensitive element with a core part: a diaphragm. The diaphragm has a constant area and is deflected by the fluid when pressure is applied.

Pressure transmitters require a power supply to function. The equipment has a transduction element that converts the diaphragm’s deflection into a signal (electrical output). The signal decreases or increases depending on the amount of pressure applied.

Pressure transducers provide long-term, stable, and consistent performance; however, they require routine calibration and maintenance for optimal performance. Their pressure measuring range, required accuracy, pressure ports, output signals, and housing material vary depending on each customer’s unique requirements.

You shouldn’t confuse a pressure transmitter with a pressure switch. Pressure switches are devices operating on electrical contact when the applied force reaches a preset fluid pressure. There are various types of pressure transmitters, including digital pressure transmitters, differential pressure transmitters and wireless pressure transmitters.

Pressure transducers and transmitters

MicroSensor provides several pressure transducers and transmitters for the food and beverage industry, process control, telemetry and HVAC, industrial and marine gases, etc. Pressure transmitters range from 0.1bar – 1000bar, and they output 0.5V – 4.5V DC/ 0.5V – 2.5V DC/ 4mA -20 mA DC, HART and RS485, etc. UL and Exd versions are available and perfect for use in hazardous conditions; moreover, you could get one custom designed.

Types of pressure transducers include:

Digital Pressure Transducers

Digital pressure transducers and transmitters output digital HART, MODBUS, RS485, and 12C signals for applications. MicroSensor provides low-consumption digital pressure transducers with a 3.3V power supply.

The pressure transducers provide pressure readings ranging between 0.07bar – 1000bar. These digital pressure transmitters provide high-precision readings and are suitable for agriculture irrigation, tank monitoring, hydropower plant applications, etc.

Differential Pressure Transducers

Differential pressure transducers are perfect for low-range pressure measurements, i.e. when measuring gases and air. The low-pressure range may be 10mbar, and the differential pressure transmitter’s best accuracy can be + or -0.075%FS. People use these pressure transducers in oil, gas, and chemical fields.

Also, MicroSensor provides differential pressure transmitters for measuring oxygen pressure. The pressure transducers are perfect for measuring gas pressure in medical oxygen storage tanks and oxygen production equipment.

Wireless Pressure Transducers

MicroSensor’s wireless transducers provide a wireless communication function with low power consumption. The wireless series has wireless pressure transmitters, differential pressure transmitters, and temperature transmitters. You can equip the device with various networks, including 4G/ NB-IoT.

The device can detect and transmit real-time data from various monitoring points like chemical and petroleum industries or hydrology, electric power, and other fields. It is perfect for use when detecting pressure in areas requiring remote and unattended monitoring.

Pressure transmitter and transducer

In various applications, you can use pressure transmitters and transducers to measure pressure differences and levels. The main components of pressure transducers include a housing with optional materials like steel, depending on the working environment. Additionally, they have a sensing element for measuring the pressure and a circuit for processing the signal.

Various pressure types of pressure transmitters and transducers include absolute pressure, gauge pressure, and differential pressure.

Absolute pressure

Absolute pressure takes a perfect vacuum as a reference point. People use absolute pressure in scientific and research laboratories where fluctuating pressure could cause issues. Additionally, people also use absolute pressure in aeronautics, where they require precise pressure measurements to determine altitude.

This formula shows the differences between absolute and gauge pressure.

Absolute pressure = Atmospheric pressure + Gauge pressure

Gauge pressure

Gauge pressure refers to atmospheric pressure as its reference point. Atmospheric pressure varies between locations, and gauge pressure helps determine accurate measurements.

Generally, gauge pressure sensors have a vented tube as a reference point for atmospheric pressure when measuring media pressure. People use gauge pressure in processes requiring pressures relative to atmospheric pressure, i.e., where pressures shouldn’t dip below atmospheric pressure.

Differential pressure

Differential pressure refers to the pressure differences between two systems or points. The gauge has a specific differential pressure, meaning one pressure is entirely atmospheric. You can use differential pressure to determine whether pipelines are clogged. Clogging decreases or increases, helping you determine where the pipe’s blocked.