Why can double-flange differential pressure transmitters not be used to measure the liquid level in a compressor separator tank
Thread Content
Question: Why is it said that double-flange differential pressure transmitters cannot be used for measuring the liquid level in a compressor separator tank? The people from the design institute replied that the dual-flange differential transmitter is limited by its range (there is oil inside the liquid separation tank, and the height of the tank is also less than 70 CM), but I think this reason is far-fetched! I checked the manual for the FCX-III Fuji transmitter, and it clearly states that the measurement range for this dual-flange model is from a minimum of 0.32 KPa to a maximum of 3000 KPa! So I don’t understand why it’s not possible to measure the liquid level in the separation tank. I asked the manufacturer, and they also said that for liquid level measurement below 3 KPa, double flanges cannot be used. But I just can’t figure out what purpose the 0.32 range is meant for I would be extremely grateful if the experts here could share their insights! Looking forward to your reply. Thank you!
Media with almost constant density can be measured
That number is there to deceive people, hehe. . . . Just as a flow meter is set to a flow range of 0–20 tons per hour, allowing it to measure anything within that range, then why is there still a setting for cutting off low signals? Because the value of this thing becomes meaningless on a small scale; although there is a value, it’s impossible to determine whether that value is accurate. It is a double-flange transmitter operating in the range of 0–3000 KPa, capable of measuring any value within this range. But why isn’t it usable at 3 KPa? 3 KPa is a fairly significant value compared to 0, yet it represents only 0.1% of the entire measurement range. Is this percentage the accuracy level of this double-flange transmitter? Although double-flange transmitters can now achieve an industrial accuracy level of 0.1%, is this value reliable? Is it practically meaningful? ? A ruler can measure distances ranging from 0 to 20 CM, but can it accurately measure distances of 0.2 mm? ?
Large fluctuations. With just a breath, you get 1 KPa; such a small range means that any slight fluctuation will cause your gauge to read erratically.
Well, actually at first I was also considering this aspect, but in the end the design institute said that it wasn’t the main reason. But after reading everyone’s answers, I feel a little bit ** clearer in my mind. It’s like the analogy that person gave: a ruler that can measure up to 20 centimeters, but if you ask it to work within a range of 0.02 centimeters, it won’t be able to meet the requirement. The filling of silicone oil is also a problem.
Thank you! There is some truth to what you say.
Of course, the range is too small; that is, when the level is at its maximum, there are only a few KPA, so this differential pressure isn’t sufficient
0.3 meters; don’t use double flanges, use something else instead.
The original poster needn’t worry; it’s a fact that it’s difficult to measure a differential pressure of around 1 Ka using double flanges – I’ve experienced this as well. :D