A very strange fault with a double-flange level gauge
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For a liquid sulfur tank, the differential pressure level transmitter has a range of 0-230 kp; the actual liquid level differential pressure should be around 170 kp, yet the transmitter on site shows a negative value of -5 kp. There is suspicion of leaks in capillaries or pipes, etc., causing pressure loss. The capillary was inspected, and a damage was found on it; however, no oil leakage was detected. This area was wrapped with tape, and all the connections of the capillary were tightened and sealed as well. The pressure value gradually increases, rising from -5 to 184 kp. This process is very slow, taking over 6 hours. During this process, the value first rises for a while, then drops slightly before rising again, and this repeats itself. In the end, the differential pressure value increased, but there was still a discrepancy compared to the actual value. I’m asking for help – how can this level gauge fault be fixed? Maybe it’s not due to the capillaries.
Can you still get accurate measurements if there’s capillary leakage? change
“\"It was found that the capillary is damaged\" – Luckily, it wasn’t completely broken?
The capillary skin is cracked, but there is still a metal hose inside, and no silicone oil leakage was detected. So it’s not necessarily a capillary issue; the value has gone back to 0 now
The capillary skin is cracked, but there is still a metal hose inside, and no silicone oil leakage was detected. So it’s not necessarily a capillary issue; the value has gone back to 0 now
Why is your range 0-230 KPa? Is it a double flange type? Still single flange, negative pressure to the atmosphere? Or reverse installation with double flanges?
Check the temperature at the flange to ensure that liquid sulfur properly transmits pressure changes, while preventing damage to the diaphragm box
This situation is usually due to a positive pressure transmission fault; in other words, there is a problem with the capillary, which is definitely leaking. It cannot be detected by the naked eye, and the pressure levels fluctuate. It might be due to the substandard quality of your diaphragm material.
The best thing to do is to try another one.
An open tank? How can it be ensured that there is no gas phase pressure if it’s not open?