Measurement methods for low flow rates

Flow measurement method and instrument preliminary list symbol description: http://www.chinaflow.com.cn/PRODUCT/images/yes.gif Most applicable http://www.chinaflow.com.cn/PRODUCT/images/delta.GIF Generally applicable? Applicable under certain conditions http://www.chinaflow.com.cn/PRODUCT/images/no.gif Not applicable Output characteristics SR square root L Linear fluid characteristics and process conditions Measurement performance Installation conditions Liquid gas Fluid characteristics Process process General small flow Large flow Corrosive high temperature Steam Accuracy Minimum Reynolds number range Pressure loss Output characteristics High accuracy flow Applicability High accuracy Total applicability Nominal diameter range (mm) Sensor installation orientation and flow direction Upstream straight pipe length requirements Clean, dirty, particle-containing fiber slurry, corrosive viscosity, non-Newtonian fluid, liquid-liquid mixture, liquid-gas mixture, high temperature, low temperature, small flow, large flow, pulsating flow, differential pressure orifice plate http://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/yes.gif(1)http://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/delta.GIFhttp://www.chinaflow.com.cn/PRODUCT/images/yes.gif(3)?http://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/delta.GIFhttp://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/delta.GIFhttp://www.chinaflow.com.cn/PRODUCT/images/yes.gif?http://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/delta.GIFhttp://www.chinaflow.com.cn/PRODUCT/images/delta.GIFhttp://www.chinaflow.com.cn/PRODUCT/images/delta.GIFhttp://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/yes.gif Medium 2 * http://www.chinaflow.com.cn/PRODUCT/images/10-4.gif Small, medium-large SR? http://www.chinaflow.com.cn/PRODUCT/images/no.gif50-1000 Any short-long nozzle http://www.chinaflow.com.cn/PRODUCT/images/yes.gif?http://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/delta.GIFhttp://www.chinaflow.com.cn/PRODUCT/images/delta.GIF?http://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/delta.GIFhttp://www.chinaflow.com.cn/PRODUCT/images/yes.gif?http://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/yes.gif(4)?http://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/delta.GIFhttp://www.chinaflow.com.cn/PRODUCT/images/delta.GIFhttp://www.chinaflow.com.cn/PRODUCT/images/delta.GIFhttp://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/yes.gif 1 in 1 * http://www.chinaflow.com.cn/PRODUCT/images/10-4.gif Small-medium SR? http://www.chinaflow.com.cn/PRODUCT/images/no.gif50-500 Any short-long venturi http://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/delta.GIFhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/delta.GIFhttp://www.chinaflow.com.cn/PRODUCT/images/delta.GIF?http://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/delta.GIFhttp://www.chinaflow.com.cn/PRODUCT/images/yes.gif?http://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/yes.gif?http://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/delta.GIFhttp://www.chinaflow.com.cn/PRODUCT/images/delta.GIFhttp://www.chinaflow.com.cn/PRODUCT/images/delta.GIFhttp://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/yes.gif 7.5 in * http://www.chinaflow.com.cn/PRODUCT/images/10-4.gif Little SR? http://www.chinaflow.com.cn/PRODUCT/images/no.gif50-1200 Any very short-medium bent pipe http://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/delta.GIFhttp://www.chinaflow.com.cn/PRODUCT/images/delta.GIFhttp://www.chinaflow.com.cn/PRODUCT/images/delta.GIFhttp://www.chinaflow.com.cn/PRODUCT/images/delta.GIFhttp://www.chinaflow.com.cn/PRODUCT/images/no.gif?http://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/delta.GIF??http://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/yes.gif?http://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/delta.GIF?? Low 1 * http://www.chinaflow.com.cn/PRODUCT/images/10-4.gif Little SR http://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gif >50 optional very short-medium wedge shaped tube 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http://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gif25-300 Any short to medium speed pipe 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low-medium http://www.chinaflow.com.cn/PRODUCT/images/10-4.gif Zhong Zhong L http://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gif1.5-100 Vertical from bottom to top without metal conical tube 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middle http://www.chinaflow.com.cn/PRODUCT/images/10-4.gif Zhong Zhong L? http://www.chinaflow.com.cn/PRODUCT/images/no.gif10-150 Volumeless oval gear 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http://www.chinaflow.com.cn/PRODUCT/images/10-2.gif CUHK L http://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/yes.gif6-250 Horizontal or vertical without waist wheel 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http://www.chinaflow.com.cn/PRODUCT/images/10-2.gif CUHK L http://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/yes.gif15-500 No scraper 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http://www.chinaflow.com.cn/PRODUCT/images/10-3.gif CUHK-Big L http://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/yes.gif15-100 Membraneless 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http://www.chinaflow.com.cn/PRODUCT/images/10-2.gif Size L http://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/yes.gif15-100 Horizontal without turbine 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http://www.chinaflow.com.cn/PRODUCT/images/10-4.gif Small-Medium Medium L http://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/yes.gif10-500 Any short-medium electromagnetic type 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short-long Doppler method http://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gif?http://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/delta.GIF?http://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/delta.GIFhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gif Low 5 * http://www.chinaflow.com.cn/PRODUCT/images/10-1.gif Small-medium no L http://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gif >25 any short target type http://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gif??http://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/delta.GIF?http://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gif?http://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gif Low-Medium 2 * http://www.chinaflow.com.cn/PRODUCT/images/10-1.gif Xiaozhong SR? http://www.chinaflow.com.cn/PRODUCT/images/no.gif15-200 Any short - medium heat http://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gif middle http://www.chinaflow.com.cn/PRODUCT/images/10-1.gif Small and medium L http://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gif4-30 Any Coriolis-free mass formula http://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/delta.GIFhttp://www.chinaflow.com.cn/PRODUCT/images/no.gif?http://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/delta.GIF???http://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gif??(3)http://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gif?(3)http://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gif High no data medium-large medium-large L http://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/delta.GIF6-150 Horizontal or arbitrary without insertion (turbine, electromagnetic, vortex) http://www.chinaflow.com.cn/PRODUCT/images/yes.gif(2)(2)http://www.chinaflow.com.cn/PRODUCT/images/no.gif(2)(2)(2)(2)(2)(2)(2)http://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/yes.gif(2)http://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/yes.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gif Low no data (2) small L http://www.chinaflow.com.cn/PRODUCT/images/no.gifhttp://www.chinaflow.com.cn/PRODUCT/images/no.gif >100(2) Medium-Long bet: (1) Round orifice plate; (2) Depends on the type of measuring head; (3) Quarter-round orifice plate, tapered inlet orifice plate; (4) Pipe diameter below 500mm; (5) Only suitable for high-pressure gas; (6) Pipe diameter below 2500mm; (7) Depends on sensor structure; (8) >200 degrees Celsius

If the flow rate is low, the differential pressure will be low; it is not recommended to use orifice plates in such cases； The Delta bar also operates on the same differential pressure principle ； For low flow rates, Kroni’s metal rotor is recommended ； If the flow rate is lower, you might consider a Fuji low-flow rotameter ；

In response to the original poster’s question, I propose the following solutions: 1 If it is a liquid medium, an electromagnetic flow meter can be used; our factory has already employed the small-diameter electromagnetic flow meters provided by manufacturers, and they have performed well. 2 If it is a gas, a turbine flow meter can be used, similar to those used for measuring household natural gas flow. The solution suggested by the person above is a rotameter, which is also an option that can be considered.

For low flow rates, the EJA115 can be used; it is an integrated orifice plate designed specifically for measuring low flow rates

An integrated orifice plate or venturi meter can be used; this is how I use it