To determine whether a system or component is operating properly, the pressure gauge is the first component you should check. For most process plants, pressure gauges must be reliable and easy to use.
Pressure gauges are designed to withstand harsh industrial environments and usually require minimal maintenance, except for regular calibration. However, if you find that the pressure gauge on your device is malfunctioning prematurely, you must check the following factors.
Pressure range selection
Selecting the pressure range is a critical step. Your pressure requirements can be determined using the system working pressure and the maximum system pressure. The maximum pressure is the highest pressure the system can withstand.
The working pressure is the average pressure of the system and should fall in the middle half of the pressure gauge dial. Pressures higher than the full-scale reading can cause system leakage and cause the meter to be inaccurate.
temperature
The temperature specifications outlined by the manufacturer should never be exceeded. In addition, the operating temperature and maximum temperature should be verified, and regular inspections should be performed to ensure that the limits are not exceeded.
Cooling devices such as siphons, capillaries, and cooling towers can be used to lower the temperature of the pressure gauge.
Wetted parts compatibility
Corrosive substances may not affect the inner walls of the system because they are very thick. However, the wall thickness of the pressure gauge is much lower, so it is easily damaged by corrosive chemicals.
Use the chemical compatibility chart to determine whether your pressure gauge can withstand the process media in the environment. In addition, if the meter is installed in a steam service, use a steam siphon to protect the inside of the meter.
vibration
Excessive vibration can cause the needle or internal mechanism to loosen. To prevent system vibration from damaging the pressure gauge, it is recommended to use capillary tubes for remote installation. If this is not possible, use a liquid-filled housing to suppress needle vibration and keep internal parts lubricated.
