Compact Orifice

The Bopp & Reuther Compact Orifice – Oriflow is a high-performance differential-pressure flow meter designed for precise flow and volume measurement of liquids, gases, and vapours. Built for versatility and reliability, it delivers exceptional accuracy even under high-pressure and high-temperature conditions, making it a trusted solution across all industrial sectors.

Developed under the expertise of Bopp & Reuther’s METRA Energie-Messtechnik division, the Oriflow combines proven orifice-plate technology with a compact, space-saving design. Its robust construction and wide range of material options—including stainless steel, Hastelloy, Tantalum, Titan, PVDF, and Monel—make it suitable for the most demanding process environments, from chemical and petrochemical plants to energy systems and safety-critical applications.

The Compact Orifice Oriflow ensures accurate mass and volumetric flow measurement for conductive and non-conductive media, offering reliable integration into modern control networks through Foundation Fieldbus, Profibus PA, or analog outputs. With optional redundant configurations, it also supports safety-relevant (SIL) measurement applications, ensuring maximum process integrity and uptime.

Bopp & Reuther Compact Orifice Series ORIFLOW D

Bopp & Reuther Compact Orifice Series ORIFLOW Model O / PVDF

Bopp & Reuther Compact Orifice Series ORIFLOW Model U

Bopp & Reuther Compact Orifice Series ORIFLOW D

High-performance differential pressure flow meter designed for accurate volume and mass flow measurement of liquids, gases, and steam. The Bopp & Reuther ORIFLOW D combines precision, durability, and modular design for efficient integration into modern process systems.

The Compact Orifice ORIFLOW D from Bopp & Reuther is a differential pressure flow meter engineered for the precise measurement of liquids, gases, and steam according to DIN ISO 5167 standards. Its modular design allows for easy installation, configuration, and compatibility with differential pressure transmitters from renowned manufacturers.

Built to perform under extreme conditions, the ORIFLOW D operates with process temperatures up to +400 °C and pressures reaching 325 bar, making it suitable for both industrial and energy applications. With Ex-approval for Zone 1, it ensures safe operation in hazardous environments.

Featuring low pressure loss and a compact sandwich construction, the ORIFLOW D offers optimal flow performance while minimizing installation space. Its 4–20 mA / HART® outputs, pulse output according to NAMUR, and integrated LCD display provide precise signal transmission and on-site monitoring.

Available in stainless steel, Hastelloy, or PVDF wetted parts, it ensures long-term resistance to corrosion and chemical wear, guaranteeing high reliability and minimal maintenance.

Technical Information

Specification	Details
Product Type	Differential pressure flow meter (DIN ISO 5167)
Model	ORIFLOW D
Measurement Principle	Differential pressure for volume or mass flow measurement
Application	For liquids, gases, and steam
Measuring Accuracy	Up to ± 0.6 % of measured value
Explosion Protection	Zone 1 (Ex-approved)
Process Temperature	−40 °C to +400 °C
Process Pressure	Up to 325 bar
Housing Material	Electronics: Aluminium, coated
Wetted Parts	Stainless steel, Hastelloy, PVDF
Power Supply	24 V DC (2-wire technology)
Outputs / Display	4–20 mA / HART®, pulse output acc. NAMUR, LCD display
Process Connection	Sandwich version DN 15–1000, Flange according to DIN or ANSI
Special Features	Low pressure loss, modular concept, compatible with external differential pressure transmitters

Applications

Energy & Power Plants – flow measurement of steam and condensate in high-pressure systems

Chemical & Petrochemical Industries – accurate control of process liquids and gases

Oil & Gas Processing – measurement of crude oil, refined fuels, and gas streams

Water & Wastewater – efficient flow measurement of treated and raw water

Industrial Automation – integration with differential pressure transmitters for process control

Options

Wetted material selections: Stainless steel, Hastelloy, or PVDF for various process media

Flange standards: DIN or ANSI for system compatibility

Sandwich design (DN 15–1000) for compact installation

Selectable output signals: 4–20 mA / HART®, NAMUR pulse output

Integrated LCD display for local indication

Compatible with multiple differential pressure transmitters from global manufacturers

Benefits

High measurement accuracy (± 0.6%) in liquids, gases, and steam applications

Wide operating range: up to 400 °C and 325 bar

Explosion-proof (Zone 1) for hazardous environments

Low pressure drop ensuring energy efficiency

Compact modular design simplifies installation and maintenance

Durable materials for corrosion and chemical resistance

Flexible integration with leading DP transmitters and control systems

More details

Bopp & Reuther Compact Orifice Series ORIFLOW Model O / PVDF

Corrosion-resistant differential pressure flow meter specially designed for highly corrosive liquids and gases. The Bopp & Reuther ORIFLOW Model O / PVDF delivers precise flow measurement, low pressure loss, and exceptional chemical durability for demanding process environments.

The Compact Orifice ORIFLOW Model O / PVDF from Bopp & Reuther is a precision differential pressure flow meter engineered for volume and mass measurement of corrosive liquids and gases in accordance with DIN ISO 5167 standards.

Built with a PVDF primary element, this model provides excellent resistance to aggressive chemicals such as hydrogen chloride gas (HCl) — whether dry or up to 100% humidity. Designed for challenging process conditions in the chemical industry, the ORIFLOW O ensures long-term stability and reliable measurement accuracy up to ±0.6% of the measured value.

Equipped with an Emerson 3051 differential pressure transmitter (intrinsically safe, HART® communication), featuring a tantalum diaphragm with inert fill, this compact unit provides accurate signal transmission and robust process monitoring.

With a sandwich design (DN 15–150), low pressure loss, and Zone 1 explosion protection, the ORIFLOW O / PVDF is ideal for hazardous environments where chemical compatibility and safety are critical.

Technical Information

Specification	Details
Product Type	Differential pressure flow meter (DIN ISO 5167)
Model	ORIFLOW Model O / PVDF
Measurement Principle	Differential pressure for volume or mass measurement
Application	For corrosive liquids and gases
Measuring Accuracy	Up to ± 0.6 % of measured value
Explosion Protection	Zone 1 (Ex-approved)
Process Temperature	−40 °C to +150 °C
Process Pressure	Up to 16 bar
Housing Material	Aluminium, coated
Wetted Parts	PVDF
Power Supply	24 V DC (2-wire technology)
Outputs / Display	4–20 mA / HART®, LCD display
Process Connection	Sandwich design DN 15–150
Special Features	Low pressure loss, high corrosion resistance, modular construction
Transmitter	Emerson 3051 DP transmitter with tantalum diaphragm, inert filling

Applications

Chemical Industry – ideal for measuring hydrogen chloride gas (HCl) or similar aggressive chemicals

Petrochemical Processes – corrosion-resistant monitoring of process gases and fluids

Pharmaceutical Production – safe measurement of chemical media in controlled systems

Environmental & Waste Gas Treatment – accurate tracking of corrosive emissions and liquids

Industrial Processing – compatible with a range of chemically active or hazardous substances

Options

PVDF primary element for high chemical resistance

Emerson 3051 DP transmitter with tantalum diaphragm

4–20 mA / HART® output and integrated LCD display

Sandwich-type installation (DN 15–150) for compact mounting

Explosion-proof design (Zone 1) for hazardous area operation

Custom process calibration for specific chemical applications

Benefits

Excellent corrosion resistance using PVDF wetted parts

High accuracy (±0.6%) even with aggressive chemical media

Low pressure loss ensures efficient flow measurement

Compact and modular design for easy installation and maintenance

Explosion-proof (Zone 1) for hazardous industrial zones

Durable aluminium housing for long-term reliability

Integrated Emerson 3051 transmitter ensures stable, precise signal output

More details

Bopp & Reuther Compact Orifice Series ORIFLOW Model U

High-precision differential pressure flow meter engineered for volume and mass measurement of liquids, gases, and steam. The Bopp & Reuther ORIFLOW Model U combines accuracy, modularity, and durability, providing reliable performance across a wide range of industrial applications.

The Compact Orifice ORIFLOW Model U by Bopp & Reuther is a differential pressure flow meter designed in accordance with DIN ISO 5167 for the accurate measurement of flow and mass in liquids, gases, and steam.

This model features a low-pressure-loss design with a modular concept that allows flexible configuration, simplified maintenance, and compatibility with differential pressure transmitters from renowned manufacturers. With a measuring accuracy of up to ±0.6%, it delivers reliable performance even under extreme operating conditions—pressures up to 325 bar and temperatures up to +400 °C.

The Model U supports 3-fold redundancy or an extended measuring range, making it ideal for critical process applications that require continuous accuracy and system safety. Constructed with a coated aluminium housing and stainless-steel wetted parts, the ORIFLOW U is suitable for both standard and hazardous environments, certified with Ex-approval for Zone 1.

It includes 4–20 mA / HART® communication, an integrated LCD display, and multiple flange standards (DIN or ANSI) for seamless system integration.

Technical Information

Specification	Details
Product Type	Differential pressure flow meter (DIN ISO 5167)
Model	ORIFLOW Model U
Measurement Principle	Differential pressure for volume or mass flow measurement
Application	For liquids, gases, and steam
Measuring Accuracy	Up to ± 0.6 % of measured value
Explosion Protection	Zone 1 (Ex-approved)
Process Temperature	−40 °C to +400 °C
Process Pressure	Up to 325 bar
Housing Material	Aluminium, coated
Wetted Parts	Stainless steel (*)
Power Supply	24 V DC (2-wire technology)
Outputs / Display	4–20 mA / HART®, LCD display
Process Connection	Flange according to DIN or ANSI
Special Features	Low pressure loss, modular concept, 3-fold redundancy or extended measuring range
Compatibility	Works with differential pressure transmitters from renowned manufacturers

Applications

Power & Energy Plants – measurement of steam, condensate, and high-pressure fluids

Chemical & Petrochemical Plants – accurate control of process gases and liquids

Oil & Gas – high-pressure measurement of refined fuels and gases

Water & Utilities – monitoring flow in industrial water and heat-exchange systems

Industrial Automation – integration into process control systems for precise mass and volume tracking

Options

3-fold redundancy or extended measuring range for process reliability

Multiple flange standards: DIN or ANSI

4–20 mA / HART® outputs and local LCD display

Compatible with various DP transmitters from top manufacturers

Modular construction for easy maintenance and integration

Explosion-proof (Zone 1) version available

Benefits

High accuracy (± 0.6%) across liquids, gases, and steam

Extremely wide operating range: up to 400 °C / 325 bar

Low pressure loss ensures efficiency and minimal energy waste

Modular, compact design for flexible installation and servicing

3-fold redundancy option enhances measurement reliability

Durable stainless-steel wetted parts resist corrosion and wear

HART® communication for smart monitoring and system diagnostics

More details

Brands

Product Types

Industries We Serve

Compact Orifice

Bopp & Reuther Compact Orifice Series ORIFLOW D

Bopp & Reuther Compact Orifice Series ORIFLOW Model O / PVDF

Bopp & Reuther Compact Orifice Series ORIFLOW Model U

Bopp & Reuther Compact Orifice Series ORIFLOW D

Benefits

Bopp & Reuther Compact Orifice Series ORIFLOW Model O / PVDF

Benefits

Bopp & Reuther Compact Orifice Series ORIFLOW Model U

Benefits