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I. Overview
The HNLG series orifice flowmeter is a differential pressure device used for measuring fluid flow in pipelines. It can measure the flow of various fluids using different types of differential pressure gauges or transmitters. The throttling device includes ring chamber orifice plates, nozzles, and other components. When combined with a differential pressure transmitter, it is widely used to measure liquid, steam, and gas flows across industries such as petroleum, chemical, metallurgy, power generation, and light manufacturing.
As the fluid flows through the throttling device, it creates a local contraction at the restriction point, increasing the velocity while decreasing the static pressure. This results in a pressure drop before and after the throttle, which is directly proportional to the flow rate. By measuring this pressure difference, the flow rate can be determined based on the principles of energy conservation and continuity.
The intelligent orifice flowmeter is an advanced version that integrates flow, temperature, and pressure detection. It automatically compensates for temperature and pressure variations, using microcomputer technology and low-power design. Its compact structure, ease of use, and powerful features make it ideal for modern industrial applications.
II. Features
â–² The throttling device is easy to manufacture, robust, stable, and cost-effective.
â–² Orifice calculations follow international standards, ensuring accuracy and consistency.
â–² Suitable for single-phase and some multiphase flow measurements.
â–² Standard throttling devices do not require real-flow calibration.
â–² Simple installation, no need for tube pressing, and direct connection to differential pressure transmitters.
Intelligent orifice flowmeter features:
â–² Uses imported monocrystalline silicon differential pressure sensors for high precision.
â–² Includes self-diagnosis and automatic adjustment capabilities.
â–² Can display cumulative flow, instantaneous flow, pressure, and temperature simultaneously.
â–² Offers online dynamic compensation, self-diagnosis, and range setting.
â–² Supports multiple communication interfaces.
â–² High stability and a wide range (greater than 10:1).
Technical Specifications:
▲ High accuracy: ±0.075%
â–² Excellent stability: Better than 0.1% FS/year
â–² Maximum static pressure: 40MPa
â–² No need for adjustment for up to 5 years of continuous operation
â–² Resistant to high overpressure and temperature fluctuations
III. Selection
| Model |
Description |
| HN LG Throttle Device (Orifice Flow Meter) |
Code |
| Two basic classifications according to structural characteristics |
K - Orifice Plate, P - Nozzle, etc. |
| Nominal Pressure (10âµPa) |
2.5 | 10 | 16 | 25 | 64 | 100 | 200 |
| Caliber (mm) |
10~1600 mm |
| Subdivided by structure |
H - Standard Orifice Plate, Y - Flanged Orifice Plate, K - Drilled Hole Orifice Plate, I - ISA 1932 Nozzle, L - Long Diameter Nozzle, W - Venturi Nozzle, G - Classic Venturi, S - Double Orifice, Q - Round Hole Plate, Z - Tapered Inlet Orifice, R - 1/4 Round Hole Plate, P - Eccentric Plate, N - Integral Orifice Plate, X - Wedge Plate, T - Special Throttling Device |
| Medium |
1 - Liquid, 2 - Gas, 3 - Steam, 4 - High-Temperature Liquid |
| Compensation Form |
N - No Compensation, P - Pressure Compensation, T - Temperature Compensation, Q - Pressure & Temperature Compensation |
| Transmitter Differential Range |
0 - Normal, 1 - Low, 2 - Medium, 3 - High |
| Live Display |
W - Throttle Sensor, X - Intelligent Flow Meter |
Related Products: Round Hole Plate, Annular Plate Flowmeter
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