The metal tube float flowmeter adopts the principle of variable area measurement for production and research, and is suitable for measuring liquids and gases. All metal structure, including indicator type, electric remote transmission type, corrosion-resistant type, high-voltage type, jacket type, and explosion-proof type. It has standard analog signal output and on-site indication of 0-10mA and 4-20mA. Accumulation, digital communication, on-site modification of measurement parameters, different power supply functions, with magnetic filters and special specifications. Widely used in complex and harsh environmental conditions such as petroleum, chemical, power generation, pharmaceuticals, food, water treatment, and various mediaDuring the process of measuring flow conditions.
1. All metal structure, sturdy and stable.2. Short stroke and small structural design.
3. Low pressure loss design.
4. The design of the new magnetic coupling structure ensures more stable transmission signals.
5. Magnetic filters can be installed according to user requirements.
6. Can be equipped with insulation or heat tracing jacket.
7. Used for gas and liquid measurement in various industries, the measurement part can use different materials to adapt to different medium conditions.
8. Suitable for harsh environments and media with severe corrosion, it has good heat resistance and pressure resistance.
9. Intelligent dual row LCD display, optional on-site instantaneous/cumulative flow display, with backlight.
10. Optional options include two-wire system, battery, and AC power supply.
11. Equipped with data recovery, data backup, and power down protection functions.
The standard LZ series metal tube float flowmeter consists of a measuring tube and a local indicator. Local indicators can also be installed with additional optionsElectrical components suitable for measuring liquids and gases.
The flowmeter adopts the principle of variable area measurement, and the measuring component consists of a conical measuring tube and a float. The float can freely move up and down in the conical measuring tube, changing the flow area in the pipeline. As the flow rate changes, the vertical position of the float in the measuring tube also changes accordingly. The position of the float is transmitted to the dial of the indicator through a magnetic transmission system in a steel pipe, indicating the size of the flow value.
In M6, M8, M9 indicators, the rotation of the follower magnet is directly transmitted to the dial; In the M7 indicator, the rotation of the follower magnet causes the pointer to linearly indicate the magnitude of the flow rate value through a cam plate.
Technical parameters |
Instrument model |
Metal tube float flowmeter |
Caliber |
DN15-DN200 |
measuring range |
Water (20 ℃) 1-200000L/H |
Air (20 ℃ 0.1013Mpa) 0.03-4000m ³/h | |
Range ratio |
10:1 20:1 |
accuracy class |
1.5% 1.0% |
pressure loss |
7Kpa-70Kpa |
pressure rating |
Standard DN15-DN50 4.0Mpa Special DN15-DN50 25Mpa |
medium temperature |
Standard type -80 ℃ -200 ℃ Corrosion resistant (PTFE lining) 0-85 ℃ High temperature type -80-400 ℃ |
Viscosity |
DN15:η<5mPa.S DN25-DN150:η<300mPa.S |
ambient temperature |
LCD type: -30 ℃~85 ℃ pointer type: -40 ℃~120 ℃ |
Connection form |
Standard type: DIN2501 standard flowmeter |
cable interface |
M20*1.5 |
power supply |
Standard type: 24V DC two-wire system 4-20mA |
Alarm type: 24V DC three wire system 4-20mA | |
Communication type: 85-250V AC 50HZ | |
Battery type: 3.6V 7.5AH lithium battery | |
ALARM IN |
Upper or lower limit instantaneous flow alarm |
Switch quantity alarm (** 100mA@30V DC) | |
Relay output (** 5A@250V AC) | |
output signal |
Standard 4-20mA pulse |
pulse output |
Accumulated pulse output, with a minimum interval of 50 milliseconds |
Communication protocol |
RS485, Modbus, HART communication protocols |
liquid crystal display |
Instantaneous flow display value range: 0-50000 (with decimal point) cumulative |
Flow display value range: 0-I | |
protection grade |
P65 |
Explosion proof sign |
Intrinsic safety type iaIICT6 explosion-proof type dIICT |
M7 and M9 indicators
M7 indicator A, a local indicator, corrects the linear flow rate through a cam plate. B、 Adopting the latest ESK signal transmitter, it can also have HART protocol communication function. C、 Installation can be selected within the on-site flow indicator instrument: |
M9 indicator A uses a pair of coupled magnets in the indicator to complete flow indication and electrical signal conversion. B、 Adopting the latest ESK signal transmitter, it can also have HART protocol communication function. C、 Installation can be selected within the on-site flow indicator instrument: |
Before installation, all packaging should be disassembled, the components that fix the float during transportation should be removed, and checked for any damage.
Before installing into the process pipeline, clean the welding slag in the pipeline to prevent impurities from blocking the instrument and affecting normal use.
To ensure measurement accuracy, it is recommended to install a 5DN inlet straight pipe section upstream of the flowmeter and a 250mm outlet straight pipe section downstream.
Flow meters can be installed vertically or horizontally. If installed vertically, the verticality should be ensured to be better than 1%. If installed horizontally, both the verticality and levelness should be ensured to be better than 1%
If the medium contains solid impurities, a filter should be installed between the valve and the straight pipe section; If the medium contains ferromagnetic substances, a magnetic filter should be installed upstream of the flowmeter.
Due to the installation of a magnetic remote transmission system in the metal tube float flowmeter, it is necessary to ensure that the magnetic fields generated by other surrounding equipment do not affect the measurement results.
Instruments installed in pipelines should not be subjected to pressure, and the inlet and outlet of the instruments should be supported by suitable pipelines to minimize stress.
When measuring low-temperature media, a jacket type should be selected.