Pressure switches are used in many different industries and applications. It is true that the uses of pressure switches vary depending upon the environment they are used in and function they are use for. However, they are broadly classified into two main types such as electromechanical and solid-state switches.
Electromechanical switches enjoyed a monopoly for many years but today solid-state switches are also becoming immensely popular.

Irrespective of the different types available, pressure switches perform the same basic function of warning devices whenever the pressure applied exceeds or goes below permissible limits. However, these switches do differ on the basis of the detecting mechanism used.

Electromechanical pressure switches

These switches function with an electronic-snap action switch. This particular switch is connected to a sensory element. The element responds to a change in pressure and the switch opens or shuts depending upon the pressure sensed by the differential switches. These pressure switches remain stable as long the pressure is stable and within acceptable limits.

Solid state pressure switches

Solid state pressure switches are used widely in industry these days. They are known as fully programmable switches and are endowed with analogue and digital features. Some solid state pressure switches consist of digital displays and multiple switch points. They are also much better than electromechanical switches. The most superior advantage of solid state switches is their long shelf life. They last around 100 million cycles. Some of the other advantages of these switches are:

• High rate of accuracy
• Shock resistant
• Resistance to vibration
• Easier adaptability to different systems

Pressure switches are used in many different industries for different applications. The use of pressure switches can vary greatly in terms of the environment they are used in and the function for which they are used. Electromechanical switches and solid state switches are two of the most commonly used pressure switches in the majority of applications.

The function of pressure switches

Pressure switches are mostly used as warning devices. When the switch detects a pressure change, it gives a warning to a control system or sounds a loud alarm.

Pressure switches are specifically designed to accurately take readings in harsh conditions. They open, close or adjust the internal contact depending on the pressure sensed and the setpoint to which the pressure switch has been adjusted.

The workings of different pressure switches

Solid-state pressure switches

Solid-state switches are usually programmable. They possess analogue or digital features and sometimes have digital displays. Moreover, these pressure switches also possess one or more switches so normally open or closed contacts can be used. They also offer some striking advantages over electromechanical pressure switches including the length of their operational life. Higher resistance to shock and vibration, adaptability in different system pressures and high accuracy rates are some other important advantages of solid-state pressure switches.

Electromechanical pressure switches

Electromechanical pressure switches include an electronic snap-action switch. Depending on the high and lows in pressure that are detected, these sensors either close or open the contact.

Pressure plays an important role in many manufacturing plants. Pressure applied or exerted can affect the functioning of a device. This is why you need the help of certain devices to control the amount of pressure applied or exerted. This is very important since the application of excessive pressure can affect the functioning of a device and cause a problem to how the machine performs.

Pressure switches are used for sensing a change in pressure. A pressure sensing device responds to such changes and accordingly makes or breaks an electrical connection. Pressure switches or pressure sensitive switches are used in several applications that require a pre-determined or stipulated amount of pressure. Therefore, it is recommended that you use pressure switches to switch off the device when pressure exceeds certain limits.

Some of the applications in which pressure switches are used are as follows:

• Automobiles
• Aircraft

Pressure switches can set off an alarm whenever the applied pressure exceeds acceptable limits. Therefore, pressure switches that measure ambient pressure react on the basis of applied pressure.

Composition of pressure switches

Usually, a pressure switch is made up of diaphragm which responds to any sort of pressure change. These pressure switches also contain electrically conductive contacts which disrupt the contact on the basis of the diaphragm movement.

Pressure switches are considered one of the most important devices in manufacturing plants. Mentioned below are some features and uses that make pressure switches an important part of a process controlled system.

Features of pressure switches

A pressure switch is a form of switch that makes an electrical contact whenever a specified pressure is applied. Pressure switches are hence used to provide ‘on’ or ‘off’ switching. Pressure switches are also designed to operate when there is a rise or fall in pressure. These switches are available in types including pneumatic pressure switches and hydraulic pressure switches.

Pneumatic pressure switches

These are one of the commonly used pressure switches in manufacturing plants. Pneumatic pressure switches can be used to switch off an electrically driven gas compressor. The gas compressor is switched off whenever a specific pressure level is achieved in the reservoir.

Hydraulic Pressure Switches

Hydraulic pressure switches are usually used in automobiles. For instance, they are used to turn on a warning light when the engine oil pressure falls below a specific level. They are also used to turn on brake lights by sensing a change or rise in pressure in the hydraulic brake pipes.

Pressure switches are commonly used in many industrial plants. The main purpose of using a pressure switch is simple – to monitor a change in pressure. Mentioned below are some of the different aspects of pressure switches.

Different uses

Pressure switches are used in many different industrial and manufacturing environments. They are mostly used in manufacturing machinery, utility plants and commercial air systems. In some industrial applications, the pressure switch responds instantly to the pressure conditions whereas in some designs the pressure switch will monitor the difference between a low level setpoint and a high level setpoint.

Design

The design and technology incorporated in these switches varies from switch to switch and the type of switching action required. The pressure monitored can be that of a natural gas or liquid such as oil. And as such, the design of these switches need to be robust, which is why there are sealed pressure switches available that work well in harsh industrial environments.

Function

Pressure switches function normally as long as the pressure applied is within permissible limits. However, the same switches will stop a control system or sound off an alarm whenever the pressure level exceeds or drops below a certain limit. Some pressure switches can be directly connected to a PLC whose program will monitor the pressure of the system. This means that the machinery is shut down automatically when the pressure crosses the setpoint limits.

Pressure switches are now used many different kinds of industry. The purpose of pressure switches depends on their specific function and the environment in which they are used. The two main kinds of pressure switches available are solid state pressure switches and electromechanical pressure switches.

Pressure switches – Their function

Pressure switches are usually used to activate a warning alarm in a control system. If there is a change in the pressure beyond normal levels then the switch sends the signal to a PLC where it is acted upon.

Pressure switch – Electromechanical

An electromechanical switch is a snap action based switch which operates if the pressure tips beyond acceptable levels. In such a situation the switch will close or open accordingly. The switch will not change state if the pressure does not go beyond its setpoint limits.

Pressure switch – Solid state

A much more advanced kind of pressure switch is the solid state pressure switch. It has digital as well as analogue functions and some units have a digital display. Accuracy rates are very high and these switches can withstand external shocks and vibration. They can be used in a very wide range of systems to keep a check on the pressure levels imposed. Solid state pressure switches are much more durable than their electromechanical counterparts.

Similar to pressure sensors and transducers, pressure switches are manufactured to check pressure levels and changes. This is why they are commonly used in many industrial applications. Pressure switches are specially configured in such a manner that they can easily sense the pressure change within just a few seconds. They are commonly used in devices where pressure is imposed for operational purposes.

Features of pressure switches

Pressure switches respond automatically when the pressure levels face drastic changes. These high-tech devices can easily gauge the pressure that is related to the electric current or flow of liquid/gas. Pressure switches only display the pressure details if the pressure imposed on the applications is at safe levels. All the pressure switches also have alarm systems which inform the operators if the pressure goes too high.

Today, various pressure switches are manufactured to gauge the pressure imposed on the applications. The design of pressure switches is based on the kind of action required to monitor the pressure changes. Out of various types, differential pressure switches are commonly seen in many plants.

Role of differential pressure switches

The main aim of differential pressure switches is to convert the pressure that is imposed on two different units in to an electrical signal. These switches can be connected to more than 1 unit. This means that with differential pressure switches, you can monitor both applications at any one time. You can also compare the pressure levels to some extent. If the pressure imposed on any application goes too high then the switch turns off the system immediately.

Do you work as an operational manager in a utility plant? If yes, then you must ensure that all your equipment and machines are in a good condition. If you use high pressure devices for production needs you need to have a PPM system in place that checks the operation of pressure switches. With the help of these devices, you can easily check the pressure levels of different types of equipment.

The importance of pressure switches

Pressure switches can sense pressure changes within a few minutes. As some have built-in alarms, they can inform operators or managers when the pressure exceeds limits. The latest pressure switches can be used to measure the pressure level of liquids, steam, gas and electric current. Once you have installed these switches in your applications then you do not need to worry about exceeding a safe level of pressure.

Where are pressure switches generally seen?

Today, pressure switches are used in different working environments such as manufacturing facilities, utility plants, machines and also public buildings. In short, these pressure gauging devices can be used in all the systems where pressure is imposed or generated. To fulfil different requirements, different kinds of pressure switches are manufactured.

Points to ponder while purchasing

If you want to buy pressure switches for your industrial application then you will need to find specific details about the design of different types of pressure switches. This is important because pressure switches are available that work in different ways. You also have to check the pressure measurement capacity of these switches and choose one that suits your industrial needs.

Today, advanced devices and systems are being introduced in many industrial plants to enhance their functionality. Pressure switches are one such device which is commonly seen in many manufacturing and utility plants. They are also used in public buildings to monitor the pressure levels.

Why buy pressure switches

Pressure sensors are similar to other pressure sensing devices which can easily track the pressure changes. The main function of these switches is to inform the operators when the pressure is extremely high or low. The managers are alerted with the help of alarms which are placed in these devices.

The advanced pressure switches are manufactured in such a way that they shut down the machine automatically without any manual intervention. On the other hand, some pressure switches require manual interference. They can check the pressure which is related to the liquids, gasses and electric current.

What designs of pressure switch are available today?

With the advancement in technology, various kinds of pressure switches are made these days. They vary on the basis of the action which is required to operate them. This means various options are available today.

The first design is known as ‘toggle switch’ which needs manual support for operation. This means that the operator needs to shut the application when the alarm alerts. A ‘microswitch’ is the second design which shuts the machine off automatically. If you have decided to buy these switches then you have to consider the measurement capacity, technology and cost of the switches.

Do you own a factory or utility plant where high pressure is imposed for production purposes? If yes, then it is a must to install pressure gauging devices in your applications. One such device is known as a pressure switch. With the help of these switches, you can easily reduce the chances of accidents and injuries which occur due to high pressure levels.

How they work

Pressure switches are specially manufactured to monitor the pressure which is imposed on the applications. The main function of these devices is to inform the operators when the pressure (imposed or generated) goes beyond safety levels. The built-in alarms help in informing the operators. The advanced pressure switches shut off the application to control the pressure levels.

At present, pressure switches are found in all kinds of applications and equipment in which pressure is generated through out the operation. The pressure can be related to the electric current, gas, liquids, etc.

Different designs

Due to different requirements, pressure switches are manufactured using different designs. The switches which require manual intervention are known as toggle switches. If you have installed these switches then you have to shut down or activate the venting systems. On the other hand, there are some switches which use microswitch design work with the help of computer program. They shut down automatically when the pressure reaches extreme levels.

If you want to make the working environment safe for your employees then ensure that pressure switches are installed in your applications.