Instrumentation: [Weekly Topic] Discussion topic for Week 13 of 2011: Cost-performance of flowmeters
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Topic for this week’s discussion: Everyone is invited to discuss the performance of flow meters from various manufacturers in terms of cost-effectiveness, operating environment, accuracy, and other aspects. Notes: 1 1) Respondents can receive up to 30 wealth rewards; only responses that involve serious and in-depth discussions will earn extra points! In principle, not more than 120 people; 2) Thank you all for your active participation.
How can this be compared? Everyone talks about their own products’ advantages, and I’m no exception. But our watches really offer great value for money!
Nantong Guoyi’s range of electromagnetic flowmeter products includes: integrated and split-type electromagnetic flowmeters, flange-mounted and clamp-type electromagnetic flowmeters, submersible electromagnetic flowmeters, battery-powered electromagnetic flowmeters (electromagnetic water meters), clamp-type electromagnetic flowmeters (hygienic type), all-stainless-steel electromagnetic flowmeters, electromagnetic flowmeters designed for liquid metals, corrosion-resistant electromagnetic flowmeters, electromagnetic flowmeters specialized for pulp and slurry, high-pressure electromagnetic flowmeters, and electromagnetic calorimeters (heat meters). The vortex flowmeter series includes: flange-type and clamp-type vortex flowmeters, integrated and split-type vortex flowmeters, all-stainless-steel vortex flowmeters, and temperature and pressure-compensated vortex flowmeters (steam mass flowmeters), among others ； The metal tube rotameter series includes models with on-site indication, power supply transmission, LCD display with power supply transmission, and explosion-proof versions ； In addition, the company offers a wide range of V-cone flow meters (V-cone flow sensors), turbine flow meters, and ultrasonic flow meters, which can meet the measurement needs of users for various fluids in different applications.
Recommended nozzles for steam flow measurement
The a+k balanced flow meter does not require a long straight pipe section, offers high precision and a long service life; it has a relatively high cost-performance ratio for its class. It is not suitable for measuring steam, moisture, dirty substances, or process liquids, and it is not widely used at present. ABB flowmeters are widely used; ABB’s electromagnetic type is the best, though it doesn’t offer good cost-performance. E+h flowmeters experience significant fluctuations, but they are quite commonly used
Differential pressure gauges of the 3051 series for flow measurement – ABB flow meters
Yokogawa, E+H, and ROSEMOUNT all offer stable performance with low maintenance requirements； It can meet various operating conditions; alkalis, acids, circulating water, brine, and so on can all be used, as long as the appropriate electrode material is selected ； The issue is that their cost-performance ratio isn’t high; the prices of these three companies are more or less similar. If compared to domestic products, they can’t be matched, as their quality is not in the same category ； The accuracy level can reach +-0.5%FS; it can be even higher if required.
Emerson mass flow meters are widely used in the LNG industry; they offer high precision, but their price is extremely high
The flow meter should be selected based on the medium being used. Elliptical gear flow meters have lower precision and a higher failure rate; flow meters such as those from Yokogawa, which use orifice plates or Venturi tubes, are very reliable. Emerson’s mass flow meters are easy to operate and can be used in a wide range of environments. Rotary flow meters also tend to have more failures. Kolon ultrasonic flow meters are easy to maintain, but they require specific environmental conditions. All of the above is based on our company’s experience~~
Both Yokogawa and Emerson have excellent performance； Well, it depends. If the performance is good, the price will naturally be higher!
Reply to 9# wangsong123: Why could the precision of elliptical gears be poor? Do you mean that there is oil leakage or backflow in these gears? The flow precision curve of elliptical gears shows that the error remains constant during continuous measurements, and it can be corrected accordingly. In fact, epicyclic gears are very accurate for measuring cumulative flow and trade volume. I came across venturi flow meters some time ago; generally, domestic venturis are purchased and then paired with transmitters. I’d like to ask everyone here: are foreign venturis more accurate? There is also an insert-type venturi for large-diameter pipes, which involves placing a small venturi inside square or circular pipes. Is this measurement method accurate? Is there anyone who understands fluid properties and can analyze it?