Installation of on-site pressure gauges

You can install a remote pressure gauge, but it needs to be calibrated; remote pressure gauges can also provide on-site display. It is necessary to have pressure displays on-site; ordinary pressure gauges are inexpensive. Since the pressure in different areas varies, multiple pressure gauges are required. Installing remote transmission pressure gauges in all such areas would result in much higher costs. The control system is not within the scope of mandatory calibration; the pressure values obtained can only be used as a reference ； Values must be displayable on-site to handle inspections, emergencies, and other such situations. Some pressure gauges are part of the safety interlock system and must be installed.

On-site pressure gauges and the method of transmitting data to the control room via PI (pressure sensors or pressure transmitters) each have their advantages and disadvantages. The selection and application of on-site pressure gauges and PI sensors usually depend on the following factors: 1. Safety requirements: In some process flows, on-site workers need to be able to view the real-time pressure of the equipment visually, so as to respond quickly in emergency situations. At this point, a pressure gauge on site becomes extremely necessary. 2. Maintenance costs: On-site pressure gauges do incur certain maintenance costs, such as regular calibration, cleaning, and replacement. However, if the central control system fails, the on-site pressure gauge can serve as a reliable backup source of information. 3. Operating costs: Although the maintenance cost of PI systems may be low, the initial investment for their installation can be high. In addition to the cost of sensors, there may also be costs associated with wiring, as well as data acquisition and processing equipment. 4. System complexity: In some simple or small-scale systems, on-site pressure gauges are sufficient to meet the requirements, while large or complex systems may need a central control system to monitor and analyze data in real time. 5. Data recording and analysis: The PI system can provide continuous data recording, which is very useful for long-term trend analysis, fault diagnosis, and optimizing process flows. 6. Ease of operation: The central control system enables centralized monitoring and control of pressure at multiple points, improving operational efficiency, whereas on-site pressure gauges require manual inspection at the location. 7. Communication disruption: In the event of a disruption in electronic communication or control systems, on-site pressure gauges ensure that operators can still obtain the necessary pressure information. In summary, on-site pressure gauges do incur certain maintenance costs, but their use is usually driven by considerations of safety and reliability. In some important devices or those with high safety requirements, field gauges and PI sensors are typically used together to ensure that accurate pressure data is available under all circumstances. In non-critical or cost-sensitive applications, it may be considered to use only a PI system. The final decision should be based on a comprehensive consideration of cost, safety, reliability, and operational requirements. .

For applications that require pressure control, on-site gauges are necessary; this is needed for inspection purposes, as well as as a backup to the remote sensors, in order to prevent distortion in the transmission of data due to damage to the remote sensors, issues with the wiring, or interference. I once saw an organization that, in order to enable centralized remote monitoring, installed cameras on all the key field display panels in addition to the DCS signals, so as to display the data from those panels directly in the control room.

The on-site meter is designed to prevent failures in remote meters, and this is also required by the standards

Local pressure gauges and those equipped with remote transmitters allow for comparison, thereby enabling the diagnosis of whether the instrument is functioning properly. It also makes it easy to directly read the operating pressure of the pipeline. It should be configured according to the actual process and production requirements; there is no one-size-fits-all solution.