HFO Orifice Plate Flow Meter

The HFO Orifice Plate Flow Meter is the most widely used and classical differential pressure flow measurement device. It operates by using a concentric orifice plate to create a pressure drop proportional to the square of the flow rate of liquids, gases, and steam.The device features a simple and robust structure with no moving parts, making it suitable for a very wide pipe size range (up to DN3000). With high accuracy (up to ±0.5%), stable operation under extreme conditions such as temperature ranges from -50°C to 550°C and pressures up to 32 MPa, the HFO is a cost-effective and reliable solution widely used for steam metering, gas measurement, and liquid flow monitoring in the energy, chemical, and oil & gas industries.

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Category: Flow Meter

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Product Overview

The HFO Orifice Plate Flow Meter is a differential pressure flow measurement device based on the throttling principle. It consists of a standard orifice plate, pressure tapping devices, and a differential pressure transmitter. The flow rate is calculated by measuring the pressure drop generated when the fluid passes through the orifice plate.It is suitable for single-phase media such as gas, liquid, and steam. With advantages including simple structure, low cost, and high standardization, it is one of the most widely used flow measurement devices in industrial metering applications.

Product Features & Advantages

Wide Temperature & Pressure Range: Supports temperatures from -50°C to 550°C and high-pressure conditions from 0.25 MPa to 32 MPa.
High Durability: Simple and robust structure with no moving parts, ensuring long service life.
Wide Application Range: Applicable for pipe sizes from DN25 to DN3000, with broad pressure and temperature adaptability.
High Adaptability: Capable of measuring high-viscosity media. Supports multiple pressure tapping methods (corner tapping, flange tapping, etc.) to suit various working conditions. When combined with a differential pressure transmitter, it enables intelligent digital measurement.
Reliable Accuracy: Measurement accuracy ranges from ±0.5% to ±1.0%, with repeatability better than 0.2% and stable linearity within the rated flow range.
Flexible Materials: Orifice plate materials can be selected based on media properties, offering strong material adaptability.
Suitable for Multiple Media: Can measure various clean single-phase media such as water, steam, air, and natural gas.
Rugged Design for Harsh Conditions: The orifice plate adopts a forged or welded monolithic structure, providing high pressure resistance and suitability for high-temperature, high-pressure, and hazardous environments.
Smart Compensation: Integrated intelligent system supports automatic temperature and pressure compensation, correcting density variations in real time. For gases, compressibility factor compensation is also supported, improving accuracy under changing conditions.
System Integration: Supports 4–20mA analog output, pulse output, and RS485 communication with Modbus protocol. Easily integrates with PLC, DCS systems, or cloud platforms for remote data acquisition and centralized management.

Technical Specifications

Item	Detailed Specifications
Nominal Diameter	DN25 ~ DN3000
Accuracy Class	±0.5%, ±1.0%, ±1.5%
Operating Temperature	-50°C < t < 550°C
Main Body Material	Carbon Steel, Stainless Steel
Measured Medium	Liquid, Gas, Steam
Turndown Ratio	1:10; 1:15
Rated Pressure	0.25 MPa ~ 32 MPa
Pressure Tapping Method	Flange Taps, Corner Taps
Output Signal	4–20mA