Are pressure switches and differential pressure switches widely used in your factory? Is it necessary?
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Our company works on projects, and in order to reduce costs, pressure switches have been installed on some compressed air tanks, compressed air pipes, and water pipes (all without interlocks), as we prefer not to use pressure transmitters. Installing pressure difference switches before and after the pump inlet filter is also a way to avoid using transmitters. As a result, the client insisted on using the UE brand from the United States. It turned out that the pressure switch models also cost over 2,000, while those with a pressure difference function cost over 4,000 – both prices being higher than those of transmitters. Do many factories use these two types?
In factories, the use of pressure switches and differential pressure switches depends on the specific process flow and equipment requirements. Generally speaking, pressure switches are more commonly used, while differential pressure switches are used relatively less often. Pressure switches are primarily used to control and protect pressure equipment such as compressors, pumps, pipes, etc. It can be controlled to turn on and off within a set pressure range, ensuring the safe and stable operation of the equipment. Pressure switches are relatively inexpensive, and they offer high stability and reliability, which is why they are widely used in many factories. Differential pressure switches are primarily used to monitor the pressure difference between two points, and are commonly employed in water or gas pipelines before and after filters. It can detect changes in pressure difference and perform on/off control to clean or replace the filter in a timely manner, ensuring the proper operation of the system. Pressure differential switches are relatively expensive and have a relatively limited range of applications; they are generally used in processes where high performance from filters is required. Considering cost savings, if pressure transmitters can meet the requirements of the process flow and equipment, and at the same time have a relatively low price, then using pressure transmitters may be a more economical and suitable choice. However, in certain specific processes or equipment, pressure switches and differential pressure switches can offer better performance and reliability, in which case it may be necessary to use them. .
Differential pressure is useful, mainly for monitoring leaks or blockages.
A pressure transmitter still needs to be used; differential pressure is not very suitable.
Switching-type meters are not recommended. Poor accuracy! Under current technical conditions, mechanical reliability is far inferior to electronic reliability! Transmitters of the same class are much more stable than switches. The precision is also high. Designing switch-type instruments is for the pit owners
It’s the owner, and they’re from the United States; I don’t think it’s your concern: lol
You’re right; originally, we chose differential pressure switches and pressure switches in order to save costs. However, with products like UE and SOR, their prices are basically on par with those of pressure transmitters, so it’s actually inappropriate to use them. Of course, unless the switches are directly interlocked without going through a DCS or PLC, that’s another matter, but that’s not our case.