Analog type is good for flow meter for factory piping
<Is analog type good for flow meter for factory piping? >
Well, in this article, we will focus on "ease of response at the time of failure" and I would like to introduce about how to select the flow meter.
In conclusion from my experience, analog type is good for general flow meters for factory piping. (It is different for food and medical use etc ... ...)
The cause and countermeasure at the time of trouble are clear.
Although it is not limited to a flow meter, the malfunction of the equipment is inherent as a plumber.
In such circumstances, the analog type flowmeter in which the movable part exists in the piping part, in many cases the cause is obvious, such as "garbage clogging" etc. if movement stops.
If it is caused by "garbage clogging", the flowmeter starts to move normally in most cases by "disassembling and cleaning the flowmeter".
However, in the case of a digital flowmeter such as an electromagnetic flowmeter, there are many defects such as "electric signal is wrong" and the cause is difficult to specify. I have experienced the cause of "There is some electric noise in the piping system" etc, but since "electrical noise" is not visible, it is not easy to find appropriate countermeasures. (Experts who are familiar with the electric field may be different, but ...)
Therefore, those involved in piping instrumentation work should review the work experience of yourself once and recommend that you consider selecting an analog type flow meter.
<Recommended flow meter maker 3 selection>
My favorite manufacturers of analog type flowmeters are the following three companies.
1. If it is an instantaneous flowmeter, "Kawaki measuring instrument Co., Ltd."
2. If integrated flow meter "Nitto Seiko Co., Ltd."
3. If it is for air, "Ryutai Kogyo Co., Ltd."
The details are as follows.
<If it is an instantaneous flowmeter, "Kawaki measuring instrument Co.,Ltd.">
The Instantaneous Flowmeter of Kawaki Measuring Instrument Co., Ltd. is an analog type which detects the flow rate by the pressure receiving plate called "flapper" moving forward and backward within the pipe under the force of fluid. The pointer moves to the extent that fluid pushes the board. The characteristic of the flowmeter for Kawaki measurement is that it is "rugged and hard to break" anyway. In the main product, the power is transmitted through the magnet (magnet coupling system), so some water hammer will not be broken basically (manufacturer will not OK ...).
Recommended model is SF type (FY type) flowmeter.
(SF type)
it seems to be the mainstream of Kawaki measurement. In addition, it is recommended to use what is called INF type for small flow rate.
(INF type)
There are also SF type flow meters with contacts (what is called "flow switch"), which is characterized by using micro switches with high electric capacity.
A switch with a low electric capacity called "reed switch" is usually used for this hand flow switch. Lead switches with low electric capacity are easy to weld, which is one of the causes of malfunction of contacts.
Meanwhile, since the micro switch is used for the SF - MA type flow switch of Kawaki measurement, troubles like welding are unlikely to occur.
This is a great help as a user.
Because I was tormented many times by welding reed switch myself.
(There were times when I worked overtime until midnight to deal with problems.) Skin roughness ... (No Д`) )
Likewise, a microswitch is used for INF - MA type flow switch for minute flow rate. I have found it useful because it has a high contact capacity and can set even a very small flow rate of about 0.4 L / min.
To mention the drawbacks, it is order-to-order production, so it may take a delivery date. Since it seems that one item is adjusted and shipped, it is necessary to make a schedule from a plan before the time when arranging mass-produced items.
It is also a drawback that looks are disgusting ($ · · ·) / ~ ~ ~ haha
Well, you can not change your belly on your back so let's keep your eyes closed. . .
<If it is an accumulated flowmeter, "Nitto Seiko Co., Ltd.>
The integrated flowmeter of Nitto Seiko Co., Ltd. is a volumetric flowmeter called "rotary type", which is also very robust.
In the past, most of household water meters were those of Nitto Seiko Co., Ltd. According to what I heard it was that the bidding was done in the past, it seems that the share of Nitto Seiko Co., Ltd. has decreased. Just this company, its technical strength is certain. Anyway, once you install it will take about 20 to 30 years.
The main product is called RS type rotary flowmeter.
(RS type)
The flow rate is detected by the rotation of a socket called a rotor. The feature is also very high precision. However, it is easy to clog dust on the structure, so it is necessary to disassemble and clean regularly. But this is convenient because it will clearly show the trouble in the piping in the form of garbage clogging when returning the back. It is horrified considering that clogged dust will enter other devices (there were cases where other devices broke down due to dust in the pipes)
Although this can be said to the flowmeter of Kawaki measurement, as mentioned above, the analog type flowmeter makes it possible to reduce the troubles afterwards because the cause and troubles of the trouble are clear.
<For Air, " Ryutai Kogyo Co., Ltd.>
Ryutai Kogyo Co., Ltd.'s flow meter is a general area type flow meter using "float". There are other manufacturers of area type flowmeters, but compared with other comparable products, it is characterized by being hard to break (my rule of thumb ...). Since it is an area type flow meter, the flow direction is basically "down to up".
Although we derail from the story of the product, we are looking at "Technical information" on the website of Ryutai Kogyo Co., Ltd. ♪ (^ ^) / Because they are making detailed pages only for this, the product must be great...
How was it?
On this page, we have recommended dedicated analog flow meters for ease of troubleshooting. I think that there are pros and cons, but all based on my actual rule of thumb.
I hope that these information will be useful to your practice at all.
