Types of pressure sensors

Pressure sensors usually come in 5 different types: Absolute, Gauge, Differential, Sealed and Vacuum. In order to differentiate between these sensors, you need to be aware of what and how they measure pressure readings.

Absolute pressure sensor: These pressure sensors are used to gauge pressures like atmospheric pressure. They measure pressure starting from 0 PSI.

Gauge pressure sensor: These pressure sensors are commonly used to measure the pressure in tyres relative to absolute pressure.

Differential pressure sensor: These pressure systems are commonly used in industry. They are used to measure the difference in pressure between two or more pressure points.

Sealed and vacuum pressure sensors: Sealed pressure sensors are used to gauge pressure related to sea-level pressure while vacuum pressure sensors measure pressure that is less than 0 PSI.

A guide to pressure sensors is a post from: Impress Sensors

Pressure transducers

The popularity of pressure transducers is increasing and many injection moulding companies are now are making use of them to add quality to their mould. Globalisation and a dynamic economy have forced these professionals to create high value products. Advances in technology have enabled the growth of a variety of pressure transducers that can be used in different environments for different purposes. Thus, they now can be used for more vigorous applications.

Why is a pressure transducer used?

Using pressure transducers, injection mould makers can get precise and updated information about how their tools are performing in the actual process of production. The various types of information that can be gained are:

1. What effect do the fluctuating temperatures have on the final part or product?
2. How the balance of the tool is affected by varying fill speeds.
3. They are also used to obtain precise information regarding the effect of moulding pressure on different parts when using slides.
4. How the varying cooling temperatures affect the final outcome.
5. Pressure transducers are also helpful in carving the design of a stronger core and cavity.

Why not just simulated software?

Some injection mould makers might be apprehensive of using pressure transducers because of their slightly complex technology and instead want to use just simulated software. A detailed analysis and comparison of simulated results with the actual data can demonstrate why pressure transducers are important.

New technology

Though pressure transducers were delicate to handle in the past, modern technology has enabled the production of more robust devices that give accurate measurements and are a good return on investment.

Pressure transducers in injection mould making is a post from: Impress Sensors

Pressure sensors

Pressure sensors are able to generate a signal by way of the pressure imposed on the optical, electrical, visual or auditory sensor. They are used in many applications and are sometimes known as transmitters or indicators. Pressure sensors measure different variables like speed, water level, gas flow and altitude.

Pressure sensors vary in type and functionality. The type of pressure sensor used mainly depends on the cost of its manufacture, the type of technology used and the purpose it serves.

Depending on pressure measurements, pressure sensors broadly fall into 5 main categories. They are elaborated upon below.

Absolute pressure sensor

An absolute pressure sensor records pressure as per perfect vacuum pressure.

Gauge pressure sensor

A gauge pressure sensor is versatile in use as it can be calibrated to adjust to the atmospheric pressure of different areas.

Differential pressure sensor

Differential pressure sensors are used to detect whether there has been an increase or decrease in two or more pressure mechanisms. It is also used to achieve a pressurised flow in large vessels.

Vacuum pressure sensor

A vacuum pressure sensor is used to calculate pressure that is lower than a given location’s atmospheric pressure.

Sealed pressure sensor

Sealed pressure sensors are used to calculate pressure at sea-level.

Uses

Pressure sensors are widely used in the aircraft and automobile industry. They also find a variety of applications in industrial environments, weather balloons, satellites, rockets and weather instrumentation.

Pressure sensors – Their different types and uses is a post from: Impress Sensors

Pressure sensors monitor this pressure and keep them under control. These sensors can be used to monitor air, water and altitude pressures. Pressure transducers, pressure transmitters and pressure indicators are some of the common names used for pressure sensors. Pressure sensors are never of the same technology. They can either be wireless or wired, depending on the needs of your industry. It is prudent to have a wireless pressure sensor installed in your devices.

The benefits of using pressure sensors

Pressure sensors are installed in a device based on the principle of resistance offered by a material that is directly proportional to the applied force on that machinery or item. This principle is commonly found in wireless pressure sensors. Wireless pressure systems are used in applications that help to monitor the status and work rate of your device. A computer or a control system receives Radio Frequency (RF) which is transmitted by the wireless pressure sensor. The better signal-noise ratio it offers, the easier it becomes for networking. The benefits offered by wireless pressure sensors make them ideal choices for companies.

There are various other uses of wireless pressure sensors but they are mostly used in heavy industries which manufacture steel, chemical and beverages. Pressure systems have the capability to determine the depth of the ice pack along with its thickness and hence are used by environmentalists on a large scale.

What exactly is a pressure sensor? is a post from: Impress Sensors

Pressure sensors are used for many industrial applications. They measure pressure of liquids and gases.

There are different types of pressure sensors manufactured. The make of different sensors depend on the applications, the technology used to manufacture them and the costs. Some common types of pressure sensors are listed below.

Absolute pressure sensor

An absolute pressure sensor will record pressure according to the perfect vacuum pressure.

Gauge pressure sensor

Gauge pressure sensors are used for different applications. This is because they can be easily standardised to adapt to atmospheric pressures of varying locations.

Vacuum pressure sensor

Vacuum pressure sensor is commonly used to record pressure that is below a given location’s atmospheric pressure.

Sealed pressure sensor

Sealed pressure sensors are used to calculate pressure at sea-level

Differential pressure sensor

Differential pressure sensors are used to obtain measurements if there has been an increase or decrease in two or more pressure mechanisms. Differential pressure sensors also help to get a pressurised flow in vessels.

Technologies used to manufacture pressure sensors

Pressure sensors are manufactured using different technologies like semiconductor piezoresistive, strain gauge and microelectromechanical systems. All these technologies have their own distinct characteristics.

Fibre optic sensors make use of fibre optic mechanism. Small parts of fibre optic interferometers are connected together to produce a fibre optic sensor. Some pressure sensors are also manufactured using mechanical deflection. Mechanical properties of a liquid are calculated to determine the pressure and to track its effect on a spring system.

Common types and technologies used to manufacture pressure sensors is a post from: Impress Sensors

Temperature sensors have a dial or display where measurements are displayed. This temperature-related information allows the operators to run the plant smoothly. If you are planning to buy temperature sensors then you must know that they are available in two different types.

Contact temperature sensors – These sensors must be placed near the object or unit. This is because they require physical contact with the application to sense the temperature levels. Contact temperature sensors are used to monitor the temperature of different liquids, gases and solids.

Non-contact temperature sensors – These types of sensors detect the radiant energy which is transmitted. Non-contact sensors can be used with various materials which emit radiant energy. These two temperature sensors are further divided into three different groups, electronic, resistive and electro-mechanical.

Temperature sensors – two different types to gauge temperature levels is a post from: Impress Sensors

Functions

Pressure transducers are used to measure or gauge pressure. They are used to sense or measure the overall pressure applied in industrial applications or devices. Pressure transducers play an important role in facilitating the smooth operations of industrial applications. Major tragedies can also be averted with the use of these devices.

Uses of pressure transducers

Pressure transducers are used in many different industrial as well as domestic applications. Given are some of the uses of pressure transducers.

Industrial uses

Pressure transducers are used as ‘control systems’ in different industries. They are also known as pressure transmitters. Miniature pressure transducers are used in the transportation industry. For example, pressure transducers or transmitters are used in aviation for different aspects such as hydraulics and navigation. They are also used in medical instruments for measuring blood pressure and other readings.

Domestic uses

Pressure transducers are used to sense or detect washer water levels. Similarly, they are also used in plugged filters and vacuum cleaner bags. Transducers are also used in digital tyre pressure gauges. Weather stations also employ pressure transducers for measuring barometric pressure.

The innumerable uses of pressure transducers have contributed to their widespread usage.

Pressure transducers – understanding the functions and uses is a post from: Impress Sensors

Unlike pressure sensors, transmitters and transducers, pressure switches stop the operational procedure when the pressure is too high. They are also programmed to break electrical connections, if required. Nowadays, different types of pressure switches have been introduced onto the market. Two popular types of pressure switches are:

Differential pressure switches – These types of switches are specially manufactured to monitor the pressure which is imposed on two different units. This is why differential pressure switches are preferred by many operators. These devices are used to monitor the operation of snap action switches.

Mechanical pressure switches – These switches are available at lower prices and are used in different industrial applications. The main aim of mechanical pressure switches is to provide details about pressure changes to the operators.

If you have decided to buy any one of the pressure switches for your industrial applications then you must know about the different parts.

Various components of pressure switches

The most important part of pressure switches is a diaphragm which measures the pressure. You will also find a ring around the diaphragm. It protects the diaphragm from outside conditions. When the pressure levels go high, a pair of electrically conductive contacts activates and alerts the operators.

Pressure switches – sense pressure changes easily is a post from: Impress Sensors

Types of temperature sensors:

Thermistors

With a change in temperature, the resistance of semiconductor material inside thermistors also changes. As the temperature rises, the resistance begins to fall. Thermistors are widely used in appliances and household items to measure and respond to changes in temperature.

The upper range of thermistors is 500 degrees F. Thermistors are extremely sensitive compared to other types of sensors such as resistive temperature detectors (RTDs) and thermocouples. While sensing the changes in temperature, thermistors have an average to fast response time.

Resistive temperature detectors (RTD)

RTDs or resistive temperature detectors are another type of resistance sensor where its resistance rises with a rise in temperature. The increase in resistance of RTDs can be correlated to degrees. An RTD can measure temperatures from -400 degrees F to 1200 degrees F. These temperature sensors are extensively used in industry for measuring fluid and surface temperatures.

Thermocouples

Thermocouples have an extensive range of operating temperatures. While a usual household oven utilises a thermistor temperature sensor, a kiln on the other had uses a thermocouple due to its higher operating temperature. The device to which thermocouples are connected reads the voltage and transforms it into a temperature reading.

Temperature sensors – different types and uses is a post from: Impress Sensors

An electric signal is generated by pressure sensors which is related to the pressure imposed on the applications. If you run a utility plant where high pressure is imposed for production purposes then you must install pressure sensors in the units. They will provide you with pressure-related information.

Due to different requirements, different types of pressure sensors are introduced in the market. This includes absolute pressure sensors, gauge pressure sensors, vacuum pressure sensors, sealed and differential pressure sensors.

What are differential pressure sensors?

Out of the different options, differential pressure sensors are most commonly seen in a lot of the industrial applications. This is because they are designed to gauge pressure changes between two or more applications. With the help of differential pressure sensors, you can measure pressure which is introduced in different units. In some cases, these pressure sensors are used to monitor pressure level or flow in pressurised vessels.

Differential pressure sensors can gauge pressure from 0-0.25mbar up to 0-200bar. They are available at output signals such as 4-20mA and 0-1-Vdc.

If you have decided to buy differential pressure sensors for your industrial applications then you have to consider the pressure range, operating temperature range, cost, etc.

Pressure sensors – Keep a constant check on pressure changes is a post from: Impress Sensors