What flow meter is used to measure 99.9% chlorine gas?
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Metal rotameters used for 99.9% chlorine often get stuck; the diameter is DN40, the pressure is 120 kPa, and the operation takes place at room temperature – what type of flow meter would be suitable?
Mass flow meters or orifice plates work fine； However, mass flow meters are expensive ； ； It depends on your company’s budget as well as the requirements for process parameters
Is there no solution when it gets stuck frequently?
What are the reasons for a metal rotor flowmeter getting stuck?
The rotor jam may be due to insufficient vertical alignment of the rotor, causing it to tilt. Alternatively, the rotor may have poor quality, resulting in significant friction between the float and the rings at its ends; in this case, it’s possible to remove the component and manually rotate the rotor back and forth to test it. If the flow rate at DN40 is sufficient, an vortex flow meter can be considered, as it requires less maintenance. Differential pressure maintenance involves many steps and numerous leakage points; it is also difficult to obtain accurate readings when the differential pressure is too low.
This post was last edited by Wang Tianze on 2016-11-1 at 19:26. Mass flow meters and thermal flow meters can be used, and they are also very suitable for measuring chlorine gas
If the required accuracy for measurement is not high, a rotameter can be used, with both the flow tube and the float equipped with corrosion-resistant coatings. There are also specially designed vortex flowmeters intended for measuring the flow of chlorine; one can refer to Yokogawa Electric’s options for specialized vortex flowmeters in this regard.
Due to the corrosive nature of chlorine gas (especially in humid conditions), finding a low-cost measurement solution represents a huge challenge for this industry. The most successful one available at present is SIERRA’s 760S series chlorine mass flow meter. This is a flow body made of Kynar® polyvinylidene fluoride (PVDF) material. This material exhibits excellent corrosion resistance and chemical resistance at both room temperature and high temperatures. PVDF also features stability, strength, wear resistance, and flame retardancy. The sensor of the 760S uses a 6-inch Hastelloy C probe and a 1-inch Hastelloy Swagelok NPT collar to be mounted on the Kynar® PVDF flow body. Hastelloy C alloy possesses excellent resistance to pitting and crevice corrosion, and is widely used in corrosive environments. Secondly, vortex flow meters using HaC alloy sensors can also be employed. How to choose still depends on what your data usage range is.