The Original Rotameter

The Variable Area Flowmeter is one of the oldest and mature principles in flow measurement with its simple design: a float rises inside a conically shaped glass tube as the flow increases and its position on a scale can be read off as the flow rate.In the 1990s, Yokogawa strengthened its focus on flowmeters through cooperation with and the eventual acquisition of the German flowmeter manufacturer ROTA. In so doing Yokogawa gained access to 100 years of flowmeter expertise and completed its flowmeter portfolio by adding the Rotameter (variable area) and Rotamass (Coriolis) product lines.


Hello my name is John Dougherty, I am a Product Manager with Yokogawa. I am here today to introduce you to Yokogawa’s line of variable area flow meters, the true original Rotameter. Yokogawa has been manufacturing their Rotameters for over 100 years with an emphasis on both quality and accuracy. Yokogawa has a complete line of both glass and metal Rotameters. All of our Rotameters can be used to measure both liquids and gases. This is our RAGK and  our RAGL model Rotameters. Both meters are rated to 230 psi and 200 degrees Fahrenheit. They come with an optional needle valve which can be placed on the inlet or outlet. Adjustable limit switches are available and can be added. Here is the RAGN it is the largest of our glass Rotameters also rated to 230 psi and 200 degrees Fahrenheit. It has 3/16 stainless steel connections and a protective shield. The RAGN has a flow range of 10 gallons per minute liquid and 95 SCFM of gas. The connections can be threaded or flanged. The yellow background allows the for easy flow readings as well as showing if the flow material has become contaminated. Adjustable limit switches are also available

Yokogawa has a complete line of metal Rotameters the RAKD and the RAMC. The RAKD is used in high pressure and high corrosive sampling system. It can come with an adjustable needle valve, adjustable intrinsically safe limit switches and a 4-20 milliamp output. Finally we have the RAMC, the workhorse of industrial flow measurement. Its operating pressure can range from 30 inches of Mercury vacuum all the way to 10,000 psi. Its temperature range is from a minus 328 degrees Fahrenheit to almost plus 700 degrees Fahrenheit. The process connections can be threaded or flanged up to a maximum of 6 inches. The RAMC works on all fluids or gases. For really corrosive applications the RAMC can be manufactured to have teflon-coated internal parts. Hastelloy-C or Monel are also available upon request. The RAMC  has a large 4-inch easy-to-read local display with an optional 4-20 milliamp Hart compatible output. A pulse output is also available. With the electronic output, we added an LCD display to the local display that is field programmable. You can program it to show the actual flow,  a percentage of range or as a totalizer. Adjustable limit switches and fail safe limit switches are also available. Transmitter and limit switches are both FM and ATEX intrinsically safe and ATEX explosion-proof.





Productos y Soluciones Relacionadas

Mini Rotámetro RAGK

El Mini Rotámetro RAGK está diseñado para la medición de líquidos y gases. El tubo de medición cónico de vidrio tiene un flotador de rotación libre. Medición de la Velocidad de Flujo: Agua = 0.002 l/h hasta 600 l/h; Aire = 0.2 l/h a 6300 l/h


Los Rotámetros RAGK/RAGL están diseñados específicamente para la medición de flujos bajos de líquido y gases. Su principal campo de aplicación es en los sistemas de purga, y sistemas de muestreo de gas, laboratorios y equipos de maquinaria.


Diseño de Acero Inoxidable
Diseñado para Aplicaciones Exigentes
Vidrio de Borosilicato
Fácil de leer, Instalar y Mantener
Interruptores con Límite Opcionales
0.04 - 44 GPM Agua  
0.09 - 90 SCFM Aire

Aire   Agua

Aplicaciones Personalizadas


El rotámetro RAKD se utiliza para la medición de líquidos y gases y es altamente preciso, en particular para flujos bajos y aplicaciones de alta presión.


316L Construcción de Acero Inoxidable 
2% Precisión de Escala Completa 
4-20ma Salida                              Protocolo Hart Disponible
Interruptores de Límite Ajustables
0.95 a 550 GPM
0.42 a 1050 SCFM

Aire   Agua

Custom Aplicaciones