Liquid Turbine Flowmeter
Liquid Turbine Flowmeter
High-accuracy liquid flow metering with a simple structure, excellent reproducibility and fast response — a preferred choice for custody-transfer measurement.
- High accuracy, typically ±1%R / ±0.5%R, with ±0.2%R available on high-accuracy models
- Short-term repeatability of 0.05% to 0.2%
- Pulse-frequency output for easy totalizing and computer interfacing
- Wide turndown ratio of 10:1 to 20:1
- Compact and lightweight structure, easy to install and maintain
Overview
The HUALIU HL-LWGY series liquid turbine flowmeter is a velocity-type flow instrument based on the principle that the rotor speed is proportional to the average flow velocity in the pipe. It is widely used for the precise metering of impurity-free, low-viscosity, non-strongly-corrosive liquids in industries such as petroleum, chemicals, metallurgy, water supply and scientific research. The meter covers sizes from DN4 to DN200, with accuracy up to ±0.5%R, excellent repeatability and a turndown ratio of 1:10 to 1:15, and features a compact structure, high measuring accuracy, fast response and easy maintenance.
In operation, the measured liquid flows through the sensor and drives the rotor to spin, its rotational speed being proportional to the average flow velocity in the pipe. The rotor periodically changes the reluctance of the magnetic circuit, causing periodic variation in the magnetic flux through the detection coil and producing an induced electromotive force at the same frequency as the blade rotation. After pre-amplification, conversion and processing, this yields a signal corresponding to the flow rate. Roughly two-thirds of the working range is a linear segment of the meter factor, giving stable characteristics that are the basis for maintaining long-term measuring accuracy.
The series offers a variety of connections including flange, threaded, tri-clamp and wafer types; the body can be specified in SUS304 or SUS316, with pressure ratings from PN1.0MPa to PN6.3MPa and medium temperatures customizable up to 150℃. Outputs support pulse, 4-20mA, as well as RS485 and HART digital communication, powered by a 3.6VDC lithium battery or 24VDC. A flameproof version (ExdIICT6 Gb) is available to meet safe-metering requirements in flammable and explosive environments.
Specifications
| Nominal diameter (DN) | DN4 to DN200 |
| Accuracy | ±0.5%R, ±1%R |
| Repeatability | ≤0.03% to ≤0.15% |
| Turndown ratio | 1:10, 1:15 |
| Medium temperature | -20℃ to +150℃ (standard type -20℃ to +80℃, high-temperature type -20℃ to +120℃, ultra-high-temperature type -20℃ to +150℃ on request) |
| Ambient temperature | -20℃ to +60℃ |
| Relative humidity | 5% to 90% |
| Atmospheric pressure | 86kPa to 106kPa |
| Applicable medium | Impurity-free, low-viscosity, non-strongly-corrosive liquids |
| Pressure rating | PN1.0MPa to PN6.3MPa (higher available on request) |
| Output signal | Pulse, 4-20mA |
| Communication protocol | RS485, HART protocol |
| Power supply | 3.6VDC lithium battery, 24VDC |
| Connection type | Flange, threaded, tri-clamp, wafer connection |
| Explosion-proof rating | Flameproof type ExdIICT6 Gb |
| Body material | SUS304 / SUS316 (rotor: stainless iron / duplex steel) |