Universal Flow Meter by Yokogawa

The RAMC variable area flow meter (rotameter) by Yokogawa is a truly universal flow meter, ideal for measuring air and highly aggressive liquids in low and high-temperature applications. The RAMC features a float blockage detection system, all mechanical design, and easily replaceable components, making it easy to maintain while delivering high reliability and performance.

Yokogawa’s variable area flow meters adhere to the highest operational safety standards, and the RAMC is no exception with wetted parts available in a variety of materials and optional intrinsically safe outputs.

The RAMC combines all the advantages of the variable area principle with robust design and reliable measurement. A truly universal flowmeter for gases, liquids, and steam applications.

Air   Water

Custom Applications


All Mechanical Design
The RAMC has a simple, robust design with three common components, making it ideal for low and high temperature applications, as well as making it highly reliable and reducing maintenance costs.

Field Replaceable Components
Many components of the RAMC are replaceable, including the float, scale, eprom (for eletronic transmitters), limit switches, and housing.

Float Damping System (for Gas Applications)
The float damping system is used in gas applications to avoid bouncing and putting a lot of wear on the float itself. The system is retrofittable and exchangeable at any time without requiring the operator to replace the float, and it can withstand a pressure maximum of up to 40 bar absolute. With this damping system, no recalibration is necessary after installation of the damping, and it is available to add on to old Yokogawa rotameters.

Float Blockage Indication System
This function is used for the electronic transmitter and detects when fluctuations remain under the preset level, activating an alarm.

Indicator Features & Options

  • Optional Electronic transmitter with HART protocol, various power supplies and signal outputs for 4-20ma and HART 5 and 7
  • Indicator is available in stainless steel and aluminum
  • Adjustable Limit Switches (optional), achieves SIL2 rating
  • Broad range of hazardous area approvals (ATEX, IECEx, FM, etc.)
RAMC A1                RAMC T6


Process Connection Diameter Flanged Process Connection  Dimension L in mm/inches NPT Process Connection  Dimension L in mm/inches
1/2" 250/9.8 295 /11.6
3/4" 250/9.8 295 /11.6 
1" 250/9.8  295 /11.6 
 1 1/4" 250/9.8  295 /11.6 
 1 1/2" 250/9.8  295 /11.6 
2"  250/9.8  310 / 12.2
2 1/2" 250/9.8  325/ 12.7
3" 250/9.8  325/ 12.7
3 1/2" 250/9.8   N/A
4" 250/9.8  N/A
5" 250/9.8   N/A
6" 260/10.2  N/A
Part Standard Optional
Flanges Stainless Steel Titanium, Hastelloy, Monel
Threads NPT Stainless Steel **
Metering Tube Stainless Steel Titanium, Hastelloy, Monel, PTFE Coated
Float Stainless Steel Titanium, Hastelloy, Monel, PTFE Coated
Indicator Housing  Stainless Steel / Aluminum **
Air (60° F, 14.7 PSIG)
Max. Flow in SCFM Connection Size  
2.5 1/2" Flanged  Request a Quote
5 1/2" Flanged  Request a Quote
8 1/2" Flanged  Request a Quote
13 1/2" Flanged  Request a Quote
25 1/2" Flanged  Request a Quote
32 1" Flanged  Request a Quote
45 1" Flanged  Request a Quote
70 1" Flanged  Request a Quote
100 2" Flanged  Request a Quote


Air (20° C, 1 bar abs.)
Max. Flow in Nm3/h Connection Size  
2.8 1/2" Flanged  Request a Quote
6 1/2" Flanged  Request a Quote
9 1/2" Flanged  Request a Quote
15 1/2" Flanged  Request a Quote
28 1/2" Flanged  Request a Quote
36 1" Flanged  Request a Quote
55 1" Flanged  Request a Quote
75 1" Flanged  Request a Quote
110 2" Flanged  Request a Quote
Water (60° F, 14.7 PSIG)
Max. Flow in GPM Connection Size  
34 GPH 1/2" Flanged Request a Quote
1.1 1/2" Flanged Request a Quote
2.2 1/2" Flanged Request a Quote
4 1/2" Flanged Request a Quote
5.5 1" Flanged Request a Quote
10 1" Flanged Request a Quote
15 1" Flanged Request a Quote
22 2" Flanged Request a Quote
38 2" Flanged Request a Quote


Water (20° C, 1 bar abs.)
Max. Flow in l/m Connection Size  
2.2 1/2" Flanged  Request a Quote
4.2 1/2" Flanged  Request a Quote
8.5 1/2" Flanged  Request a Quote
17 1/2" Flanged  Request a Quote
22 1" Flanged  Request a Quote
38 1" Flanged  Request a Quote
55 1" Flanged  Request a Quote
85 1" Flanged  Request a Quote
140 2" Flanged  Request a Quote

Yokogawa can size and build a metal or glass Rotameter for your specific application. Whether it is a gas or liquid, extremely hot or cold for any industry you may be in. Please fill out as much information as you can on the form below and we will quickly contact you and assist with getting you the Rotameter best suited to your application.

To receive a quote, click on the link below and complete the questionnaire in the message field.

Request a Custom Application Quote



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Product Overview

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.

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