Bi-rotor Positive Displacement Flow Meter

Bi-rotor Positive Displacement Flow Meter

A Bi-Rotor positive displacement (PD) flow meter is a high-precision device that measures volumetric flow rate using two meshing helical rotors that create fixed-volume measuring chambers inside the housing. The rotation speed directly reflects fluid velocity, driving a sealed coupling to display accurate flow rates and total volume.

To meet demanding industrial requirements, TBEL supplies durable, corrosion-resistant stainless steel units built for tough applications. These meters offer high accuracy, reduced pressure drop, and smooth operation without downstream pulsations, making them ideal for challenging fluids like oil-in-water mixtures and media with entrained solids.

AVAILABLE BRANDS:

SMC (USA)

Description

Short Description & Specifications

Nominal Diameter1/4″ to 16″ (8 mm to 400 mm) ANSI or DIN Flange
Measuring MediumLiquids, oil-in-water media, fluids with entrained solids, gasoline, liquefied gas, kerosene, crude oil, heavy oil
Accuracy & RepeatabilityStandard ±0.5% of reading (optional ±0.2% or ±0.1%) | Repeatability: ±0.01%
Measuring Range & ViscosityFlow Range: Up to 8800 GPM (2000 m³/hr) | Viscosity Range: 0 to 20,000 cP (mPa.s)
Working TemperatureProcess: -22°F to 480°F (-30°C to 250°C) | Ambient: 104°F to 176°F (40°C to 80°C)
Working PressureMax 930 psig (64 bar) | Ratings: 1.6 MPa, 2.5 MPa, 4.0 MPa, 6.4 MPa
Material OptionsBody & Rotors: Cast Steel, 304 Stainless Steel, 316 Stainless Steel, Carbon Steel
Outputs & Signal OutputPulse Output (24VDC), Current Output (4-20mA, 2-wire), Digital Output (RS485/RS232 Modbus RTU)
Enclosure & ApprovalsNEMA 4 (IP65) | UL, CSA, ATEX, NEPSI Class I, Div 1 & 2 Approvals

Features & Key Advantages

Helical Bi-Rotor Design

Two precisely machined helical rotors mesh without metal-to-metal contact to create low pressure loss and virtually eliminate downstream pulsations.

High Precision Measurement

Offers standard 0.5% accuracy with options down to 0.1% or 0.2%, combined with an exceptional 0.01% repeatability.

Rugged Double Case Construction

Prevents loss of calibration caused by environmental fluctuations, temperature changes, or line pressure variations.

Low Maintenance & Self-Lubricating

Self-lubricating system with a reduced number of parts, providing exceptionally low noise, minimal vibration, and extended service life.

Enhanced Particle & Viscosity Tolerance

Handles viscous fluids up to 20,000 cP, entrained solids, and challenging applications like oil-in-water mixtures with ease.

Advanced Batching & Mounting

Supports vehicle/skid mount configurations (SMS-716) with 2-stage batching, overrun compensation, and NIST traceable calibration.

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