Seeking help with the selection of level gauges for complex operating conditions
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The company has installed an evaporation system, and now it is facing difficulties in selecting a suitable level gauge for the evaporation tank. The operating conditions are extremely complex: the reactor is lined with graphite. The conditions include: 1. Evaporation at around 120°; 2. Presence of strong fluorine compounds; 3. Vacuum environment; 4. Formation of foam – the vacuum inside causes uneven foam thickness. The material being evaporated can corrode the viewing lenses, so no such lenses are used, which means the foam thickness cannot be determined. 5. Steam is present, and the level of the liquid to be evaporated fluctuates significantly. 6. Crystals form at the bottom of the reactor. Instruments that have been tried include: 1. Monel alloy differential pressure level gauge: susceptible to corrosion, and the diaphragm of this gauge has scratches. 2. PTFE-lined magnetic flap level gauge: due to the high concentration of the material after evaporation, the magnetic flaps get clogged frequently. 3. Radar level gauge: since the foam thickness is unknown, the manufacturer advised against using this instrument, especially given the presence of large amounts of steam. Instruments that still need to be tried include: 1. PVDF linkage level gauge: Advantages include resistance to temperatures up to 150° and resistance to fluorine compounds; choosing an appropriate size float can help avoid issues caused by foam. Disadvantages include possible frequent fluctuations due to boiling of the material, and the reliance on magnetic induction may lead to delays in response and eventual failure of the instrument. 2. Wall-mounted level gauge: Its sensitivity remains uncertain, and the effects of foam and the graphite lining are not known. I seek advice from experts – the operating conditions are simply too complex.
Try a top-mounted magnetostrictive level gauge, and increase the gap between the float and the rod. If boiling is a concern, a PTFE static well can be added to reduce its impact.
Thank you so much. I’ll look up some information and ask the manufacturer tomorrow. Thank you; this type of level gauge is pretty much the only method I can think of. .
Differential pressure level gauges are not suitable for applications with a higher vacuum level; the recommendation for floor 2 is a good choice.
This post was last edited by 1111111 on 2018-12-22 at 17:14. Fluorine .............. is very difficult to deal with. . . But with such a large reward, there’s no shortage of mercenaries or outlaws. It’s the New Year, and I really need money to spend… Sisi si si. The country may be in ruins, but principles still matter. – The sensor diaphragm cannot be used for measurement when it’s not in contact with liquid; it also cannot be used for measurement when it’s not in contact with air
What kind of level gauge is this, man?
It is a level gauge with a zero-leakage gas collection and pressure sensing diaphragm that is not in contact with liquid; it still operates on the principle of hydrostatic pressure. The measuring elements consist of one or two pressure sensors. In terms of technical approach, gas collection and pressure sensing can be further divided into short-tube gas collection and full-tube gas collection. “For the measurement principle of pressure accumulation in gas collection, refer to the schematic diagram of short-pipe gas collection below
There is a vacuum inside me, and it changes frequently
This post was last edited by 1111111 on 2018-12-22 at 21:24. I posted that image earlier; it shows 7 types of vacuum level gauges as well as 7 typical methods for taking pressure readings from the liquid phase. All of these are used in situations where the vacuum level changes frequently. :lol If the vacuum level really remains constant, then those gauges would be left unused.
Is t3t also your account? ? What materials can this type of level gauge be made from? ? The glass here is even corroding.
1. It is inevitable for hydrofluoric acid to corrode glass. 2. For the material in contact with liquid, plastic must be used. 3. For the material in contact with gas, plastic is also required, and protection against hydrofluoric acid in the steam must also be taken into account.