Regarding the selection of radar level gauges
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According to SH/T 3005-2016, clause 8.2.6, guided-wave radar level gauges should be used for containers or tanks with agitators. However, per HG/T 20507-2014, clause 7.2.10, non-contact radar level gauges are recommended for such containers or tanks. Which of these two approaches is more appropriate for measuring the level in containers equipped with agitators? We can discuss which type of radar level gauge people use in practice~~~ Automatic control instruments
You need to consider the size of the mixer; if its diameter is roughly the same as that of the tank, there will be no space to install a guided-wave radar, and in that case you’ll have to opt for a pulse radar level gauge. If the liquid level fluctuates significantly due to mixing, it will be difficult to achieve accurate readings, so installing a guided-wave radar on the side might be a good option.
So, it’s better to use guided-wave radar in containers or tanks that have agitators, right? Does anyone here have practical experience with this? What is the actual effect of side mounting or top mounting?
Side mounting is better. Whether to use a radar or not depends on the properties of the material – factors such as temperature, volatility, and tendency to crystallize come into play. It’s not necessary to use a radar; double-flange sensors can also be used for measurement. However, double-flange sensors can only be installed sideways, so it’s also important to consider the structure of the storage tank in question, to see if there is a suitable spot for side mounting. Electric float level gauges can also be used, especially in situations where crystallization, coking, or residue buildup is a concern. It’s not that one type of level gauge is the best, but rather which one is more suitable
Reactor, 316L, up to 220°C, -0.1 Mpa, with stirrer, density 1000 kg/m3
The negative pressure here is quite high; it’s likely that a fan is being used to create this negative pressure. For reactors with a capacity of a few tons and a small volume, side-mounted double flanges could be an option. Continuous stirring might affect the measurement of pressure on the positive pressure side, so it’s best to run a section of pipe separately; when using double flanges, those equipped with capillaries are recommended.
I consulted several level gauge manufacturers, and they said a double flange design isn’t necessary for this pressure
http://yunrun.com.cn/tech/1579.html
Then I would like to ask, how is negative pressure measured? Are domestic step-down transformers still of substandard quality in terms of technology? You have to choose a joint venture brand; isn’t EJA or Rosemount an option?