There is no pressure when the pressure gauge is in operation

The question raised by the original poster is simple, but it’s hard to know where to start. First, you need to ask the technicians whether there is pressure inside the tank when the valve is opened, and roughly how much that pressure might be. Next, you should check what the range of the pressure gauge is and whether that range is appropriate. Also, it’s necessary to verify whether the pressure gauge is accurate and in good condition; determine if it needs to be adjusted manually, and identify any issues with the gauge itself. If the gauge is fine but its pointer doesn’t return to zero after long use, it can be adjusted manually. However, if the gauge is damaged, with its internal mechanical components broken or its internal transmission parts rusted, then it cannot be adjusted manually – a specific analysis of the problem is required. Finally, if this gauge is very important, it’s advisable to replace it with a pressure transmitter, choosing an appropriate range, as this will provide much greater accuracy. After all, domestic pressure transmitters aren’t expensive either. If the original poster really isn’t sure how to choose one, they can turn to me for help in making the selection

I vaguely remember that such containers are supposed to have an on-site pressure gauge for local monitoring; a remote transmission device is not necessarily required. Monitoring the transmitter is never as convenient as having a pressure gauge.

Pressure vessels are equipped with pressure gauges, but it’s not clear whether the one described by the original poster is of this type. If one needs to accurately read the gauge readings or check for any faults in the gauge, a pressure transmitter is more convenient. As for what this marine enthusiast said about the convenience of not having a pressure gauge, I don’t think there’s a big difference – one provides direct indication, while the other offers digital display along with remote transmission capabilities. Moreover, it’s simpler to zero a pressure transmitter than to zero a pressure gauge

What type of tank is this (under pressure or at atmospheric pressure)? What is the range of the pressure gauge? If it is a pressure vessel, the pressure gauge installed on it is subject to mandatory calibration and must be sent to a calibration institution qualified to carry out such tasks; the calibration interval for pressure gauges is half a year. It is a pressure vessel at atmospheric pressure, and its pressure gauge can be calibrated by oneself.....

Hahaha, I know; this one has low pressure, right? A low valve opening pressure means that the pressure is indeed low. When the valve is closed, air gets trapped between the valve and the pressure gauge.

When calibrating a pressure gauge with a spring tube, one needs to check the wire and gears at the downstream end. If the wire is damaged, the gauge is unusable; as for the gears, it’s necessary to see how severe the damage to the teeth is – if the damage isn’t too serious, the gauge can still be used, but if it’s severe, there will be no linear response at all and the gauge is unusable.

For observation, you can easily see the pressure gauge from ten meters away, but can you see the display on the pressure transducer?

Regarding this issue, I can only say that there are advantages and disadvantages on both sides. The accuracy of pressure transmitters can reach 0.075%, but the accuracy of pressure gauges is not very good. The pressure in question belongs to the category of low pressure; for such situations, I would recommend using a pressure transmitter for greater accuracy – that’s all. Of course, you’re right as well: pressure gauges are more intuitive. But I think this should be considered based on the accuracy of the instrument. Of course, if the instrument isn’t particularly important, then it doesn’t really matter