NORGREN pressure switches play a crucial role in industrial automation, fluid control, and many fields involving pressure monitoring. Although it may seem unremarkable, it is like a precise 'guardian', constantly monitoring the pressure changes of the system to ensure the safe and stable operation of the equipment. However, for many people, there are still many cognitive blind spots. Next, this article will analyze the core knowledge of the device, take you away from confusion, and delve into its mysteries.

1、 Basic principles

　　NORGREN pressure switchThe cornerstone of our work is the principle of mechanical equilibrium. When the pressure of the measured medium acts on the sensing elements of the equipment, such as diaphragms, bellows, or pistons, these elastic elements will deform. Taking the diaphragm as an example, as the pressure increases, the diaphragm will protrude to one side, and this small displacement change is amplified and converted through transmission mechanisms such as levers, springs, etc. Once the pressure reaches the preset set value, also known as the threshold, the transmission mechanism will trigger the micro switch. A microswitch is like a sensitive "switch" that quickly connects or disconnects the circuit connected to it, thereby achieving control of the circuit, issuing corresponding signals, or starting backup equipment, or stopping the operation of the current equipment, in order to maintain the stability of the entire system pressure.

2、 There are various types, each with its own advantages

1. Mechanical pressure switch

This is a more traditional and common type. With its intricate internal mechanical structure, it can work independently without the need for an external power source and has high reliability. For example, in a simple water pump control system, a mechanical pressure switch can automatically control the start and stop of the water pump motor based on changes in water pressure. But it also has certain limitations, such as relatively limited accuracy, narrow adjustment range, and long-term frequent use, mechanical components are prone to wear and may affect performance.

2. Electronic pressure switch

By using high-precision pressure sensors to sense pressure, and then processing and judging it through electronic circuits. Its significant advantages lie in high precision, fast response speed, ability to achieve complex logic control, and convenient integration with other electronic devices. Like the pneumatic control system in modern factories, electronic pressure switches can regulate air pressure to ensure the precision of production processes. However, due to its reliance on electronic components, it has higher requirements for electromagnetic compatibility in the usage environment, and the cost is usually higher than mechanical ones.

3、 Interpretation of key parameters

1. Set point

The specific pressure value for the desired device action must be set according to the actual application scenario. For example, in a fuel boiler system, in order to prevent overpressure hazards, the set point of the equipment should be slightly lower than the design pressure resistance value of the boiler to ensure timely cut-off of fuel supply within a safe range.

2. Range

The pressure range within which the pressure switch can monitor and effectively output signals. When selecting a range, it is necessary to ensure coverage of possible larger and smaller pressures, while avoiding a decrease in resolution caused by a large range, which may result in a lack of sensitivity in capturing subtle pressure changes.

3. Repetitive error

Reflecting the consistency of its output state when multiple actions are taken at the same set point. High quality equipment with minimal repeatability error means that each time the set pressure is reached, the corresponding action can be accurately and reliably triggered, which is crucial for processes that require continuous and stable control.

4. Dead zone

It refers to a non changing area between the switch being activated due to an increase in pressure and then being activated again due to a decrease in pressure. Reasonably setting a dead zone can prevent misoperation caused by momentary small pressure fluctuations, but a large dead zone may also lead to slow response, which needs to be optimized after weighing the pros and cons.

4、 Key points for installation and maintenance

During installation, it is essential to ensure that the equipment is perpendicular to the pipeline to avoid measurement deviation caused by tilting; The interface should be sealed to prevent leakage. Regular calibration is an important part of daily maintenance, and it is generally recommended to calibrate with a standard pressure source at least once a year to check the accuracy of the actions. At the same time, pay attention to the working environment, as harsh conditions such as high temperature, humidity, and corrosive gases can corrode the switch. If necessary, install protective covers to extend the service life.

In short, a deep understanding of the principles, types, and parameters of NORGREN pressure switches, as well as mastering the correct installation and maintenance methods, is necessary to fully utilize their role in various fields, and enable this "invisible guardian" to safeguard our production and life, away from the troubles and risks caused by lack of understanding.