YOKOGAWA RAMC Flowmeter

YOKOGAWA RAMC Flowmeter

1. Product Overview

The YOKOGAWA RAMC Flowmeter is a premium industrial variable area rotameter engineered by Yokogawa Electric Corporation, delivering reliable, cost-effective, and high-stability flow measurement for liquids, gases, and low-pressure steam across diverse industrial scenarios. Built on over a century of rotameter manufacturing expertise, this short-stroke metal tube flowmeter stands out for its robust all-mechanical structure, wide temperature and pressure adaptability, and minimal maintenance requirements, making it a universal solution for standard and harsh process conditions.

Unlike conventional glass tube rotameters with fragile structures and limited application ranges, the YOKOGAWA RAMC Flowmeter adopts an all-metal sealed design, perfectly compatible with opaque, corrosive, high-temperature, and high-pressure fluids. It supports both on-site visual reading and intelligent digital signal output, balancing basic mechanical measurement reliability and modern industrial automation compatibility. Widely deployed in chemical processing, water treatment, oil and gas, pharmaceutical, and energy industries, it serves as a core flow monitoring device for process parameter control and pipeline flow calibration.

2. Core Working Principle

The YOKOGAWA RAMC Flowmeter operates on the classic variable area flow measurement principle. When the medium flows upward through the tapered metering tube, the buoyancy and dynamic pressure of the fluid push the float to rise. As the float ascends, the annular gap between the float and the tube wall increases, until the fluid dynamic force, buoyancy, and float gravity reach a dynamic balance. The vertical position of the float directly corresponds to the instantaneous flow rate of the medium, enabling intuitive on-site flow reading via the built-in precision scale.

Equipped with an optional professional float damping system for gas measurement scenarios, the device effectively eliminates float bouncing and operational wear caused by unstable gas flow, ensuring stable and consistent measurement data without recalibration after system installation. Additionally, the integrated float blockage detection system monitors abnormal flow fluctuations in real time, triggering alarm prompts for blocked or stalled float status to avoid process monitoring failures.

3. Key Technical Specifications

The YOKOGAWA RAMC Flowmeter features comprehensive parameter coverage and standardized industrial design, adapting to global mainstream pipeline specifications and process operating conditions. All technical indicators comply with Yokogawa’s strict factory calibration standards and international industrial safety certifications.

3.1 Basic Operating Parameters

Measuring Medium: Clean and slightly turbid liquids, industrial gases, low-pressure steam

Maximum Working Pressure: 160 bar (2320 psi)

Operating Temperature Range: -20℃ to 250℃ (-4℉ to 482℉)

Measurement Accuracy: Standard ±2.0% FS (Full Scale); optional ±1.0% FS high-precision version

Repeatability: ≤±0.5% FS, ensuring consistent long-term measurement data

Pressure Loss: Low differential pressure design with stable and minimal pressure drop during operation

Installation Mode: Vertical pipeline installation (upward flow direction); supports horizontal thread connection and standard flange connection

3.2 Flow Range Parameters (Standard Working Conditions)

Flow data is calibrated under standard atmospheric pressure and rated temperature, covering common pipeline calibers for industrial applications:

Air Flow (20℃, 1 bar abs.): 2.8 Nm³/h to 110 Nm³/h, compatible with 1/2″ to 2″ flanged connections

Air Flow (60°F, 14.7 PSIG): 2.5 SCFM to 100 SCFM for different caliber specifications

Water Flow (20℃, 1 bar abs.): 2.2 L/min to 140 L/min, matching 1/2″ to 2″ standard flanges

Water Flow (60°F, 14.7 PSIG): 34 GPH to 38 GPM for mainstream pipeline sizes

3.3 Pipeline Connection Specifications

The device supports diversified connection methods to adapt to different on-site installation environments, with standardized overall dimensions for seamless pipeline integration:

Connection Types: NPT internal thread, standard industrial flange

Applicable Calibers: 1/2″, 3/4″, 1″, 1-1/4″, 1-1/2″, 2″, 2-1/2″, 3″, 4″, 5″, 6″

Flange Connection Length: Uniform 250mm (9.8 inches) for all calibers

NPT Thread Connection Length: 295mm (11.6 inches) for 1/2″ to 2″ calibers; 310mm to 325mm for large calibers above 2″

3.4 Material Configuration

Customizable wetted parts materials meet anti-corrosion, high-temperature, and wear-resistant application requirements, ensuring long-term service life in harsh media environments:

Standard Materials: All wetted parts (metering tube, float, flange) adopt 304 stainless steel; indicator housing uses stainless steel or aluminum alloy

Optional Special Materials: Titanium alloy, Hastelloy, Monel alloy, PTFE coated lining, suitable for strong acid, strong alkali, and corrosive media

3.5 Electrical & Communication Parameters

Signal Output: Optional 4-20mA analog signal output, compatible with HART 5 and HART 7 protocols

Fieldbus Communication: Supports PROFIBUS PA and FOUNDATION Fieldbus industrial bus protocols

Safety Rating: Optional adjustable limit switches with SIL2 safety certification

Hazardous Area Certification: Complies with ATEX, IECEx, FM and other international explosion-proof certifications

Float Blockage Detection: Built-in intelligent monitoring function, automatically alarms when flow fluctuation is lower than the preset threshold

4. Outstanding Product Features

The YOKOGAWA RAMC Flowmeter integrates Yokogawa’s decades of industrial flow measurement technology, with multiple optimized designs that distinguish it from ordinary variable area flowmeters:

Full Mechanical Reliability: The core measurement structure adopts a pure mechanical design, no need for power supply for basic on-site reading, avoiding measurement failure caused by power failure or circuit failure, and adapting to complex power supply environments

Low Maintenance & Replaceable Components: Float, precision scale, electronic transmitter EEPROM, limit switch, and housing components are all field-replaceable, eliminating the need for overall equipment replacement and greatly reducing operation and maintenance costs

High Environmental Adaptability: All-metal sealed structure resists vibration, dust, and moisture; wide temperature and pressure resistance covers most industrial process working conditions

Stable Gas Measurement Performance: Retrofittable gas float damping system suppresses float jitter, maintains measurement stability under turbulent gas flow, and requires no recalibration after installation

Diversified Expansion Functions: Supports multiple communication protocols and safety accessories, can be seamlessly connected to industrial PLC and DCS systems, realizing automatic monitoring and remote data transmission

High Safety Standard: Multiple international explosion-proof and safety certifications, suitable for flammable, explosive, and high-risk industrial working conditions

5. Industrial Applications

With its excellent comprehensive performance and flexible customization capabilities, the YOKOGAWA RAMC Flowmeter is widely used in precise flow monitoring and process control in multiple industries:

Water & Wastewater Treatment: Flow detection of ozone disinfection medium, industrial circulating water, and chemical dosing pipelines

Chemical & Petrochemical: Measurement of corrosive chemical reagents, process gas, and low-viscosity liquid media

Pharmaceutical & Fine Chemicals: Precise flow control of purified water and sterile process media

Oil & Gas: On-site flow monitoring of pipeline gas and low-pressure process fluids

Energy & Power: Auxiliary steam and cooling water flow measurement in power plant systems

New Energy Industry: Flow calibration and monitoring in biodiesel production and new energy process pipelines