Bopp & Reuther Flowal® Plus | Oval Wheel Flowmeter for Industrial Liquids

Oval Wheel Meter Flowal® Plus Series

Founded in 1872, Bopp & Reuther Messtechnik GmbH is a globally recognized leader in precision flow, density, and energy measurement technology. With more than 150 years of experience, the company has built a strong reputation for engineering excellence, German quality, and innovation in industrial measurement solutions.

Headquartered in Mannheim, Germany, Bopp & Reuther develops and manufactures a wide range of instruments, including flow meters, density and concentration meters, energy measurement systems, flow computers, and dosing solutions. These products are designed to meet the highest standards of accuracy, reliability, and durability, making them trusted worldwide in critical industries

Bopp & Reuther Oval Wheel Meter FLOWAL? Plus Series OR

Bopp & Reuther Oval Wheel Meter FLOWAL? Plus Series OF

Bopp & Reuther Oval Wheel Meter FLOWAL? Plus Series OR

The Bopp & Reuther FLOWAL® Plus OR is a high-performance single-case oval wheel flow meter designed for precise liquid measurement across a wide range of viscosities. With ±0.3% accuracy (optional ±0.25%), low pressure loss, and robust multi-material construction, it offers exceptional reliability, flexibility, and long-term performance for both industrial and custody transfer applications.

The FLOWAL® Plus OR from Bopp & Reuther is an advanced direct volumetric flow meter engineered for accurate and repeatable liquid flow measurement, even under demanding process conditions.

Using the proven oval wheel principle, it provides linear and viscosity-independent performance, making it ideal for applications involving lubricants, fuels, chemicals, and other process liquids with viscosities greater than 3 mPa·s.

Built for durability and versatility, the FLOWAL® Plus OR is available in stainless steel, aluminum, PVDF, polypropylene, or PEEK housings, with wetted parts in stainless steel and PEEK to ensure corrosion resistance and compatibility with aggressive media.

The flow meter supports multiple power and output configurations — including NAMUR, NPN, PNP, battery, or 24 VDC supply — with 4–20 mA, pulse, or digital display outputs.

It also features a maintenance-free design, low pressure loss, and a blind 2-channel pulse version suitable for custody transfer metering systems.

Certified for Zone 1 explosion protection, the FLOWAL® Plus OR is a compact, efficient, and future-ready solution for precision liquid metering in industrial automation, process control, and transfer operations.

Technical Information

Parameter	Specification
Product Type	Direct volume meter (Single-Case design)
Application	Accurate flow and volume measurement of liquids (> 3 mPa·s)
Measuring Accuracy	±0.3% of measured value (optional ±0.25%)
Explosion Protection	Zone 1 (Ex-approved)
Process Temperature	–40 °C to +130 °C
Process Pressure	Up to 68 bar
Housing Material	Stainless steel, aluminum, PVDF, polypropylene, PEEK
Wetted Parts	Stainless steel, PEEK
Power Supply	NAMUR, NPN, PNP, battery, or 24 VDC
Output / Display	4–20 mA, pulse output, or digital display
Process Connection	Internal thread according to ISO 288
Special Features	Low pressure loss, maintenance-free operation, 2-channel pulse pick-up for custody transfer systems

Options

Output Versions: Pulse, 4–20 mA, or digital display

Power Supply Options: NAMUR, NPN, PNP, battery, or 24 VDC

Material Configurations: Stainless steel, aluminum, PVDF, polypropylene, or PEEK housing

Accuracy Upgrade: Optional ±0.25% precision calibration

Custody Transfer Ready: Blind version with dual-channel pulse output for legal metrology systems

Temperature Range Extension: Suitable for low-temperature (-40 °C) and high-temperature (+130 °C) environments

Applications

Oil & Gas Industry: Custody transfer and monitoring of fuels, lubricants, and refined liquids

Chemical Processing: Flow measurement of solvents, resins, and aggressive chemicals

Pharmaceutical & Cosmetic Manufacturing: Controlled dispensing and batching of liquid ingredients

Food & Beverage Industry: Measurement of syrups, oils, and viscous fluids

Energy & Utilities: Flow control and metering in process and auxiliary systems

Water Treatment & Environmental Systems: Monitoring of process fluids and additives

Benefits

High Accuracy: ±0.3% standard, optional ±0.25% for custody transfer precision

Versatile Material Selection: Corrosion-resistant options for wide chemical compatibility

Explosion-Proof Design: Certified for Zone 1 hazardous area operation

Low Pressure Loss: Efficient performance with minimal flow resistance

Maintenance-Free Operation: Reliable mechanical design with long service intervals

Flexible Outputs: Supports analog, pulse, or digital signal communication

Wide Temperature & Pressure Range: Operates up to 130 °C and 68 bar for diverse process environments

Custody Transfer Ready: Dual-channel pulse version for legal metrology and fiscal measurement

Compact & Easy to Install: Internal thread (ISO 288) connection simplifies installation and integration

More details

Bopp & Reuther Oval Wheel Meter FLOWAL? Plus Series OF

The Bopp & Reuther FLOWAL® Plus OF is a high-precision single-case oval wheel flow meter engineered for accurate measurement of liquids with viscosities above 3 mPa·s. Offering ±0.3% accuracy (optional ±0.25%), low pressure loss, and multi-material construction, this versatile meter delivers reliable, maintenance-free operation for industrial and custody transfer applications.

The FLOWAL® Plus OF from Bopp & Reuther is a direct volumetric flow meter designed for precise flow and total volume measurement of liquids across various process conditions.

Its oval wheel measuring principle ensures consistent, viscosity-independent performance and exceptional accuracy, making it suitable for fluids such as oils, lubricants, and chemicals with viscosities greater than 3 mPa·s.

Constructed from stainless steel, aluminum, PVDF, or polypropylene, with wetted parts in stainless steel and PEEK, the FLOWAL® Plus OF is built for durability and corrosion resistance.

It operates efficiently at temperatures from –40°C to +130°C and pressures up to 68 bar, making it ideal for high-demand process industries.

Equipped with 4–20 mA, pulse, and digital display outputs, and powered via NAMUR, NPN, PNP, battery, or 24 VDC, the FLOWAL® Plus OF provides flexible integration with automation systems.

The blind 2-channel pulse version is also suitable for custody transfer metering systems, meeting industrial and legal measurement standards.

With its maintenance-free, low-pressure-loss design and Zone 1 explosion-proof approval, this flow meter ensures long-term stability and precision for a wide range of applications.

Technical Information

Parameter	Specification
Product Type	Direct volume meter (Single-Case design)
Application	Flow and volume measurement of liquids (> 3 mPa·s)
Measuring Accuracy	±0.3% of measured value (optional ±0.25%)
Explosion Protection	Zone 1 (Ex-approved)
Process Temperature	–40 °C to +130 °C
Process Pressure	Up to 68 bar
Housing Material	Stainless steel, aluminum, PVDF, polypropylene
Wetted Parts	Stainless steel, PEEK
Power Supply	NAMUR, NPN, PNP, battery, or 24 VDC
Output / Display	4–20 mA, pulse output, or digital display
Process Connection	Flange according to DIN or ANSI standards
Special Features	Low pressure loss, maintenance-free, blind 2-channel pulse pick-up for custody transfer metering

Options

Output Versions: 4–20 mA analog, pulse, or digital LCD display

Power Supply: NAMUR, NPN, PNP, battery, or 24 VDC

Material Variants: Stainless steel, aluminum, PVDF, or polypropylene housing

Accuracy Enhancement: Optional ±0.25% calibration for custody transfer systems

Custody Transfer Ready: Blind 2-channel pulse configuration for legal metrology applications

Temperature & Pressure Options: Suitable for operation up to 130°C and 68 bar

Applications

Oil & Gas: Custody transfer and flow control for refined fuels and lubricants

Chemical Industry: Accurate dosing of process liquids, solvents, and resins

Energy & Power Generation: Monitoring and control of process and auxiliary fluids

Pharmaceuticals & Cosmetics: Precision filling and blending of liquid ingredients

Food & Beverage: Measuring syrups, oils, and high-viscosity fluids in process lines

Industrial Automation: Integration into control systems for production and process monitoring

Benefits

Exceptional Accuracy: ±0.3% standard, ±0.25% optional for custody transfer-grade performance

Explosion-Proof Zone 1: Certified for safe use in hazardous industrial environments

Durable & Chemical-Resistant: Choice of stainless steel, PVDF, aluminum, or polypropylene materials

Low Pressure Loss: Optimized flow path design for efficient operation

Maintenance-Free: Reliable mechanical operation with minimal servicing required

Flexible Connectivity: Supports 4–20 mA, pulse, and digital outputs for system integration

Wide Operating Range: Suitable for high pressure (68 bar) and extreme temperature conditions

Custody Transfer Capable: Dual-pulse blind version meets legal metrology requirements

Compact & Versatile: Easy to install with standard DIN or ANSI flanges

More details

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Oval Wheel Meter Flowal® Plus Series

Bopp & Reuther Oval Wheel Meter FLOWAL? Plus Series OR

Bopp & Reuther Oval Wheel Meter FLOWAL? Plus Series OF

Bopp & Reuther Oval Wheel Meter FLOWAL? Plus Series OR

Benefits

Bopp & Reuther Oval Wheel Meter FLOWAL? Plus Series OF

Benefits