Additional update post on which flow meter to use for measuring methanol,

It is not used for trade measurement, but only for general monitoring; therefore, mass flow meters are not under consideration. . .

I saw your post yesterday as well; today, with the specific data you provided, it’s much easier to make a choice. 1. Formaldehyde (70% water content) can be used with A. The oval gear flow meter, made of 304 stainless steel, has the advantages of simple installation and a long service life. The positive displacement flow meter offers high accuracy, provided that the fluid does not contain any particulate impurities or bubbles. The downside is that the price is relatively high compared to electromagnetic ones. B. Electromagnetic flowmeters are also a good option; their advantages include high precision, no pressure loss, and easy installation. The downside is that it requires a lot. For example, to achieve a perfect result, the medium must be free of bubbles, as air does not conduct electricity. The temperature should generally not exceed 60 degrees. 2. Urine formaldehyde: a chemical liquid. Due to a temperature of 110 degrees and a pressure of 6 KG, type A is generally used for such special operating conditions. The elliptical gear flowmeter made of 304 stainless steel has the same advantages as mentioned above. If B has enough money, they can use mass flow meters or ultrasonic flow meters; the latter are more expensive.

Reply to 3# leo 丶 torres Thank you! I wonder if the elliptical gear flow meter comes with a 4-20mA output? What is the minimum flow rate that this type of flow meter can achieve? The flow rate of the second medium is very low. Also, because the tube is small, the gears inside it are small as well; can it withstand a pressure of 6 kg? I hadn’t come across this type of flow meter before, hehe

This post was last edited by zyzs on 2011-7-17 at 13:43. Reply to 4# Fanhua Suieruo: Elliptical gear flow meters can provide a 4–20 milliampere output. The helical gear flow meter belongs to the category of positive displacement flow meters; it offers high accuracy, is easy to install, has a long service life, and requires low maintenance costs. Don’t worry about the flow rate range – your specified range falls exactly between the maximum and minimum flow rates that an elliptical gear flow meter can handle, so the performance will be excellent. In terms of pressure, we can withstand a maximum of 6.3 KG of pressure.

Elliptical gear flowmeters are now rarely used; they are on the verge of being phased out. Moreover, they are mechanical in design, prone to wear, and difficult to maintain. It is recommended that you use an electromagnetic flowmeter, a orifice plate flowmeter, or a vortex flowmeter. If high measurement accuracy is required, a mass flow meter can be considered, but its cost will be higher than that of the former.

Reply to 1# Fan Hua Sui Luo: For ordinary flow monitoring purposes, a metal tube float flow meter can be used; it is made of 304 stainless steel, is explosion-proof, features an LCD display, provides an output of 4-20mA or 24VDC, has an accuracy of 1.5 grade, and should be installed vertically from bottom to top. http://www.shakic.com/cp/product10.htm

Reply to 6# Wild Lion: It’s a vortex flow meter; the pipe diameter is only DN15, and the pressure is 6 kg. I’m not sure if it will work Mass flow meters are not under consideration for small factories. . . . You know what I mean: lol

Reply to 8# Fanhua Suiluo: Parameters related to the vortex flow meter (for reference only). For a DN15PN40 device handling liquid media, the flow rate ranges from 0.3 to 4 m3/h.

This post was last edited by qugd on 2011-7-17 at 14:19. Reply to 1# Fanhua Suieruo: It seems you made another mistake; the title says it’s about measuring methanol flow, but the content of the post deals with formaldehyde and urinary formaldehyde.

Our factory uses Yokogawa SE series electromagnetic flowmeters to measure methanol flow, and they perform very well – with a diameter of dn25