Rota Yokogawa RAMC series metal tube float flowmeter

Main features of the product

Structural principle: A conical metal measuring tube with an internal float that rises and falls with the flow rate; Magnetic coupling transmits the position of the float to the meter head, without medium contact transmission mechanism.

Advantages: Simple installation, sturdy and durable; Mechanical indicators do not require power supply and have low pressure loss.

Two major categories of liquid receiving materials

Stainless steel 316/316L;

PTFE lining (strong corrosion condition);

Special orders available: nickel based alloys, titanium materials.

Measurement range (calibration conditions: water 20 ℃; air 20 ℃, 1   bar absolute pressure)

Water: 0.0025~130 m ³/h

Air: 0.075~1400 m ³/h

Range ratio of approximately 10:1; The actual range is affected by the density and viscosity of the medium; We recommend using the official software FlowConfigurator for selection.

Measurement accuracy: According to VDI/VDE 3513-2, ± 1.6% at 50% flow point; Normal version ± 2.5%; The error in small traffic segments will increase.

Optional configuration

Gas working condition float damping, suppressing float jumping;

Heat tracing steam/heat transfer oil interface;

Two types of header shells: 90 type stainless steel shell; 91 type yellow painted aluminum alloy shell, protection IP66/67, NEMA4/4X/6;

Electronic transmission unit (- E/- J/- P/- F)

Two wire system with 24 VDC power supply;

-E: 4-20 mA analog output;

-J：HART 7；

-P：Profibus‑PA；

-F：FOUNDATION‑Fieldbus；

LCD display: instantaneous flow rate, total amount, percentage; Can display the internal temperature of the transmitter; Support on-site user calibration; Float stuck alarm; Adjustable output damping; NAMUR-NE43 fault level.

Limit switch (NAMUR intrinsic safety proximity switch)

Normal version/K1-K3: SIL1;

Fault safety fail safe version/K6-K10: SIL2;

Output 1 mA/3 mA NAMUR signal; It can achieve high limit, low limit, and high low limit combination alarms.

An intrinsically safe isolation power supply module (/Wxx series options) is required.

Safety document: FMEDA report can be provided for SIL functional safety assessment.

Model system, nominal diameter and process connection

Diameter series RAMC01~RAMC15, DN15~DN150.

Rich forms of process connections

EN flange PN16/40/63/100;

ASME B16.5 Class150/300/600 RF；

Threads: NPT internal thread, G internal thread, DIN11851 external thread;

Sanitary clamp Tri Clamp.

Shell model

90: Stainless steel shell;

91: Aluminum alloy yellow coating shell (explosion-proof DB shell can only use 91 shell);

-T: Pure mechanical meter head; E/J/P/F: with electronic transmission; – N: No header.

Electrical parameters

E (4-20mA): power supply 14-30 VDC; Load resistance ≤ (U-14)/0.020; Fault output<3.6 mA (NAMUR NE43).

J-HART7: Load 230-600 Ω; Fault<3.6mA or>21mA.

P/F (PA/FF fieldbus): Bus power supply 9-32 VDC; The working current is 14 mA.

NAMUR limit switch: 8 VDC; Output 1 mA/3 mA; requires a matching isolation safety barrier.

Cable gland: M16 × 1.5 (90 shell); M20 × 1.5 (91 shell); Optional NPT 189-14.

Temperature and pressure performance

Liquid contact temperature

Stainless steel measuring tube: -196 ° C~+400 ° C;

PTFE lining: -80 ° C~+130 ° C.

Ambient temperature

The lowest temperature for ordinary mechanical meter heads is -25 ℃; Option/A26 can be expanded to -40 ° C; LCD display screen is unavailable below -25 ° C, and button operation is prohibited;

The minimum environment for the explosion-proof DB shell (91 shell) is -20 ℃.

Pressure temperature (PT) rating gauge: pressure decreases with increasing medium temperature for different flange forms; The gasket adopts Klingersil C4400.

Installation length: The document provides a complete installation length table for metal pipes and PTFE lining pipes for pipeline design.

Explosion proof certification 

It is divided into three categories: intrinsic safety ia, explosion-proof Ex-db/tb (explosion-proof and dustproof), and mechanical type without electronic components, including China NEPSI certification.

Category Option Code Description

The intrinsically safe IA transmitter/KS1 (ATEX)/ES1 (IECEx)/NS1 (China NEPSI)/GS1 (EAC) is suitable for Zone 0 intrinsic safety; 90/91 shell

Intrinsic safety+dustproof/KS2/ES2 ia electronic+tb dustproof, limited to 91 shell only

Explosion proof+dustproof db/tb/KF1 (ATEX)/EF1 (IECEx)/NF1 (China NEPSI)/GF1 (EAC)/UF1 (Brazil INMETRO) shell made of 91 aluminum alloy; Ex   db   IIC, Ex   tb   IIIC Dust Explosion proof

No electronic pure mechanical header/KC1/GC1 no electrical components, non electrical explosion-proof

Limit switches should also be equipped with corresponding explosion-proof options; Explosion proof instruments do not include cable glands when leaving the factory, and users need to purchase them separately.

Simultaneously supporting FM/UL North America, INMETRO Brazil, PESO India, KOSHA Korea, EAEU Eurasian Union EAC, China RoHS, and China TSG special equipment licensing (/TS1/TS2).

Select ordering options 

Limit switch/K1 MIN; /K2 MAX； /K3 MIN‑MAX； /K6-K10 fault safety fail safe version, SIL2。

Heat tracing/T1-T6: Steam/heat transfer oil heat tracing interface (only for stainless steel liquid connection).

/A16: Extend the header rod, under high temperature conditions, keep the header away from the high temperature process pipeline.

/A26: Low temperature -40 ° C version (LCD low temperature failure).

Anti corrosion coating/X1/X2: epoxy coating on the shell.

Certificate types: Material certification PMI, NACE, ASME-B31.3, penetrant testing, radiographic testing, etc.

Quick delivery/QD: Factory shipment within 48 hours.

Safety Barrier Power Supply/W Series: Provides isolated power supply for NAMUR limit switches.

Key points of installation planning

Installation posture: Vertical, with the medium flowing from bottom to top.

Gas measurement: The operating pressure should be at least 5 times the pressure loss to suppress float bounce; The float damping option can be activated.

Multiple float flow meters are arranged in parallel: the distance between the measurement tube centers is ≥ 300   mm, and the distance from ferromagnetic objects is ≥ 250   mm to avoid mutual interference of magnetic fields.

Easy to scale media, it is recommended to install bypass pipelines for easy disassembly and cleaning.

Viscosity will significantly affect accuracy, and high viscosity conditions must be accounted for.

Ordering requires providing: medium, temperature, pressure, density, viscosity; Gas requires calibration status; Tag number is required.

Machinery and Weight

Provide external drawings of 90 stainless steel shell and 91 aluminum alloy shell; Including various interface dimensions such as flanges, clamps, and threads.

Whole machine weight: 3-20 kg, varying with diameter and connection form; /A16 extension rod increases weight by approximately 1 kg.