Key points for using a scraper flow meter?

Do you know what a scraper flowmeter is? And do you understand its functions? Most people probably aren’t familiar with these questions. But don’t worry—today, we’ll dive into essential knowledge about single-use filters. If you’re also interested in this topic, stick around as we explore it together. We hope this will give you some valuable insights when it’s time to make your selection!

Although scrapers are now widely used across many industries, most people still feel unfamiliar when they first encounter them. Therefore, before using one, it’s important to understand that a scraper is actually a volumetric flowmeter designed to measure the volume flow rate of fluids in closed pipelines. Currently, it’s primarily employed for metering heavy oils like crude oil. The scraper flowmeter can display cumulative flow directly on-site and also features a remote output interface, making it compatible with dedicated photoelectric pulse converters and flow integrators for applications involving remote measurement, display, and control. The outer radial surface of the scraper’s unique core boasts a geometric profile similar to that of a classic Venturi tube’s inner surface, creating a narrowed annular flow passage between itself and the inner wall of the measuring tube. As a result, the throttling process experienced by the fluid passing through this internal Venturi tube closely mirrors the behavior seen in both traditional Venturi tubes and annular orifice plates. In fact, scrapers deliver exceptionally high measurement accuracy—typically achieving a basic error margin of as low as ± 0.2%-0.5% , up to ± in cases of special requirements 0.1% Specifically, the characteristics of the scraper flowmeter are typically unaffected by fluid properties or the Reynolds number. It can accurately measure fluids with higher viscosity, and variations in fluid viscosity have minimal impact on the indicated reading. Additionally, it requires no external power source, making it easy to operate. The meter features dual displays for cumulative flow—both readings can be reset individually—providing users with convenient flexibility for intermittent measurement applications.

The scraper bearing is made from cemented carbide and features exceptional wear resistance, corrosion protection, sand-proof capabilities, and excellent stability. Additionally, this product incorporates a stepless speed regulator—a unique technology developed by domestic scraper flowmeter manufacturers—particularly noted for its ease of adjustment. When an error occurs between the scraper flowmeter's indicated value and the calibrated value, simply use a screwdriver to rotate the adjustment rod until it reaches the desired correction point; no replacement of parts is required. In fact, during operation, the scraper conveyor is also equipped with an optoelectronic output shaft, which can be paired with an optoelectronic pulse converter to enable long-distance transmission of pulse signals or 4-20mA Signal. The scraper flowmeter is equipped with an electronic flowmeter. The scraper machine can achieve RS485 Remote communication enables direct reading of both instantaneous and cumulative flow rates, with the added advantage of longer transmission distances. A orifice plate is installed inside the scraper, featuring a central circular hole whose diameter is smaller than the inner diameter of the pipeline. As gas flows past the orifice plate in front of the scraper, it moves steadily forward. However, when the gas passes through the orifice plate—due to the reduced hole size and the resulting contraction of the cross-sectional area—the previously stable flow pattern becomes disrupted. Consequently, the scraper's flow velocity increases, while the gas's static pressure decreases.

The article above highlights key points about using scraper flowmeters—topics that our editor has carefully curated for you. If you’re curious, don’t hesitate to check it out; we’re confident it won’t disappoint. That’s all for today’s content—hope it was helpful!