HFM400 Pointer-Type Metal Tube Variable Area Flow Meter
Measured Media: Compatible liquid, gas and steam
Flow Range: Liquid 1.0–150000 L/h; gas 0.05–3000 m³/h
Range Ratio: 10:1 standard; 20:1 special
Indication and Output: Local pointer; optional LCD, 4–20 mA, HART and alarm contact
Wetted Materials: SS304 standard; SS316L, Hastelloy, titanium and PTFE-lined options
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Overview
The HFM400 is a pointer-type metal tube variable area flow meter for measuring the flow of compatible liquids, gases and steam. Its metal measuring tube and local mechanical indicator suit industrial lines where a glass-tube meter would not provide the required pressure, temperature or mechanical protection.
Available nominal sizes include DN15, DN25, DN50, DN80, DN100 and DN150. The meter is particularly useful for small-pipe and low-flow duties, while larger configurations extend the product family to liquid flows up to 150000 L/h and gas flows up to 3000 m³/h.
The standard design provides local pointer indication without direct contact between the measuring element and the external indicator mechanism. Depending on the selected configuration, the HFM400 can also provide a dual-line LCD, two-wire 4–20 mA transmission, HART communication and a dry-contact alarm output.
Each meter must be selected for the actual medium, operating flow, density, viscosity, pressure, temperature, flange standard and required signal. These conditions determine the measuring element, calibrated scale, wetted material and pressure-temperature configuration.
Features
It is suitable for measuring the flow rate of medium with small diameter and low velocity
Reliable operation, small amount of maintenance, long life
Requirements for straight section are not high
Wider range ratio of 10:1
Double-line LIQUID crystal display, field instantaneous/cumulative flow displa
There is a keyboard on the indicator for easy operation and setting
All-metal structure, suitable for high temperature, high pressure and strong corrosive mediu
Non-contact magnetic coupling transmissio
Can be used in inflammable and explosive dangerous occasions
Optional DC power supply or battery power supply mode
With data recovery, data backup and power down protection functions
Multi-parameter calibration function
Product Advantages
Local Flow Indication
The pointer gives operators a direct view of flow at the pipe. It can be used where local indication is sufficient or combined with an electronic output when the signal must also be sent to a PLC, DCS, recorder or remote display.
All-Metal Measuring Structure
The measuring cone, float and process connections form a robust metal flow path. This construction is suitable for process environments where a transparent measuring tube is not preferred. Material compatibility still has to be checked against the medium and cleaning conditions.
Non-Contact Magnetic Coupling
Float movement is transferred through the tube wall by magnetic coupling. There is no mechanical shaft penetrating the measuring tube between the process and the indicator, which separates the pressurized process chamber from the external pointer mechanism.
Practical Piping Requirements
Variable area measurement does not depend on a high-speed turbine rotor or an electromagnetic field. The HFM400 generally needs less straight pipe than many velocity-based meters, but installation disturbances must still be considered. Valves, reducers and pumps should not create unstable flow or float oscillation at the meter inlet.
Configurable Measurement Package
The HFM400 can be configured around local reading, remote transmission, totalization, material selection, pressure class and temperature duty. Optional electronics can include parameter setting, calibration data storage, backup and power-loss protection.
