If you have any kind of hydraulic machines at home or at work, you must get a hydraulic pressure transducer. Transducer is a component used for converting energy from one form to another. The type of transducer already tells us what the transformation is (for example an electromechanical transducer, transforms an electrical signal into mechanical or vice versa). It is a device used mainly in the fields of medicine, agriculture, robotics, aeronautics, etc., to obtain information from physical and chemical environments and to obtain (from this information) electrical signals or impulses and vice versa. The transducers always consume a certain amount of energy, so the measured signal is attenuated.

Types of Hydraulic Pressure Transducers:

There are two types of transducers: Sensors and Actuators

  • The sensors detect forms of energy, such as light or force, and become output digital information. Sensors are transducers that transform a physical impact into an output signal. For example, a thermocouple that produces a measurable change in the electrical voltage when it is heated or cooled. Or the load that is generated when a hydraulic force is applied to a piezoelectric force measurement ring.
  • The actuators also receive input and generate output but operate in the opposite direction, unlike a sensor. An actuator is a hydraulic pressure transducer that receives information and produces an output, consisting of some form of physical energy. For example, when a mobile phone vibrates in our pocket, it does so through the effect of actuators.

Why Do You Need A Hydraulic Pressure Transducer?

A pressure sensor belongs to the group of pressure gauges, which is the first element of a measurement chain, the physical quantity - pressure (= force per surface) in electrical output as a measure of the pressure forming. The SI unit for pressure is Pascal with the unit symbol Pa. Types of Hydraulic pressure transducer are available for measuring steady-state pressure, a pressure difference or pressure fluctuations up to sound pressure. Depending on the measuring method, there are different pressure sensors in the market, such as:

  • Absolute Pressure Sensors: This type of sensors draws their pressure measurement to vacuum with a pressure of almost 0 bar.
  • Differential Pressure Sensors: These sensors measure the pressure difference between the two measuring chambers, which can have different pressures. Pressure changes that affect both chambers are not detected.
  • Bidirectional Differential Pressure Sensors: Like the differential pressure sensors, this type measures the pressure difference that exists in two chambers. The special thing is that the measuring membrane can bend in both directions, hence the term bidirectional.
  • Relative Pressure Sensors: This type is similar to the differential pressure sensor. As a reference, the relative pressure relative to the atmosphere (atmospheric air pressure) is measured.
  • Barometric Pressure Sensors: This type is an absolute pressure sensor specifically designed for the 0-1.3 bar pressure range and measures barometric pressure.

The sensors on the market output a standardized electrical signal, which can be easily processed by the downstream device. Analog unit signals can be 0 ... 10 V, 0.5 ... 4.5 V rat or 4 ... 20 m A; there are also standardized digital interfaces such as I²C or CAN bus. These pressure sensors are passive components that require a power supply to process the signal. The characteristic curves of the sensors can be linear or they can correspond to an exponential function; Disturbance variables (e.g. temperature) must be compensated and the characteristic curves should be linearized appropriately.

It can be understood that a hydraulic pressure transducer is extremely important as they are the first line of measurement. The measurement influences a lot of decisions in the chain of processes involved in the operation of different machines.

Published by Zac Ferry