The micro flow float flowmeter is designed based on the principle of magnetic coupling, suitable for measuring small-volume flow rates of liquids and gases. Each flow rate of the measured medium corresponds to a fixed position of the magnetic float inside the measuring tube. This position is indicated by a pointer in the indicator through magnetic coupling, and the volume flow rate of the liquid or gas passing through the measuring tube can be obtained by reading the scale on the dial.
In addition to being equipped with an on-site indicator, the micro flow float flowmeter can accommodate up to two switch signal outputs for flow over-limit control. The remote indicator features an LCD that displays the instantaneous flow rate of the mea sured medium and supports 4-20mA two-wire current output and HART® protocol digital communication.
The micro flow float flowmeter can also be equipped with a flow control valve at its inlet or outlet, integrating the flow control valve with the flowmeter for convenient adjustment of small flow rates. In applications with significant medium pressure fluctua tions, a constant flow valve can be installed at the inlet or outlet to ensure stable and accurate measurements.
Thanks to its compact size, lightweight design, stable and reliable operation, minimal maintenance requirements, low straight pipe section requirements, and diverse installation options, the micro flow float flowmeter is widely used in industries such as petroleum, chemical, and steel for small-flow measurement and process control.
Characteristics
· Ultra-low Full Scale Range:
For water (20°C): Full scale as low as 3 L/h
For air (20°C, 0.1013 MPa): Full scale as low as 50 NL/h
· Compact and Lightweight with Diverse Connection Options:
The flowmeter offers process connections such as threaded or flanged options, allowing horizontal or vertical installation based on the on-site piping system.
· Supports Two Switch Signal Outputs:
One adjustable bistable reed switch outside the indicator
One or two NAMUR switches inside the indicator for convenient on-site flow monitoring
· Optional flow control valve:
A needle valve can be installed at the inlet or outlet of the flowmeter, enabling precise and convenient micro-flow adjustments.
· Constant Flow Valve for Pressure Fluctuations:
In applications with frequent medium pressure fluctuations at the flowmeter inlet or outlet, a constant flow valve (PE or PA t ype) can be installed.
These valves ensure stable flow output even when the inlet or outlet pressures vary
Main Technical Parameters
· Measuring medium: liquid and gas
· Flowmeter model: G22 horizontal connection, G24 vertical connection
· Measuring range (100% full scale): Water (20°C): 3 to 100 L/h; Air (20°C, 0.1013 MPa): 50 to 3400 L/h
· Range ratio: 10:1
· Measurement accuracy: ± 4% F.S. Special ± 2.5% F.S
· Medium temperature range: -25°C to +120°C for field indicators, -20°C to +70°C for remote indicators, maximum tempera ture ≤ 200°C
· Maximum medium pressure: ≤ 13 MPa
· Ambient temperature: -25°C to +70°C
· Switch signal output: Bistable reed switch signal 2-Wire NAMUR limit switch SJ2-S1N
· Electrical remote signal output: 2-Wire 4-20 mA output superimposed HART Protocol Digital Communications
· Connection type:
G22: Standard 1/4″ NPT female thread, mounting center distance 125 mm
G24: Standard 1/2″ NPT female thread, mounting height 160 mm
Optional: ø6 mm, ø8 mm, ø10 mm, ø12mm clamp
DN15 PN4.0 (GB 9119-2000), 1/2″ ANSI 150LB flange, mounting height 250 mm
Special: According to the user's requirements
· Medium flow direction:
Standard: bottom in - top out (G24), bottom back side in - top back side out (G22)
Special: bottom in - top back side out, bottom back side in - top out
· Indicator shell material and protection level: cast aluminum, epoxy resin electrostatic spraying, protection grade IP65
Product Model
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Description |
| Type |
HT57 |
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1/4 "NPT horizontal connection, mounting center distance 125 mm |
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1/2 "NPT vertical connection, mounting height 160 mm |
| Material |
RR |
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304 |
| R0 |
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316 |
| SM |
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Special materials |
| Indicator type |
M |
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The mechanical pointer indicates the instantaneous flow rate on site |
| E |
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24 VDC power supply, 2-Wire 4-20 mA |
| Flow regulating needle valve |
N |
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No flow regulating needle valve |
| VE |
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The flow regulating needle valve is installed at the inlet of the flow meter |
| VA |
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The flow regulating needle valve is installed at the outlet of the flowmeter (optional) |
| Process connection |
N2 |
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1/2″ NPT female thread |
| N4 |
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1/4″ NPT female thread |
| N8 |
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1/8″ NPT female thread |
| F |
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Flange connection (flange standard optional, total installation height 250 mm) |
| 6 |
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ø6 mm clamp connection |
| 8 |
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ø8 mm clamp connection |
| 10 |
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ø10 mm clamp connection |
| 12 |
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ø12 mm clamp connection |
| M |
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Panel mounting |
| Constant flow valve type |
P |
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Without constant flow valve |
| PE |
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With inlet constant flow valve |
| PA |
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With outlet constant flow valve |
| Switch signal type and quantity |
K |
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No switch signal output |
| R1 |
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1 bistable reed switch signal output |
| D1 |
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1 NAMUR switch signal output |
| D2 |
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2 NAMUR switches signal output |
| Explosion-proof type |
X |
None |
| Ex |
Intrinsically safe and explosion-proof |
Ordering Instructions
· Before ordering, please carefully read the product selection manual. If you have any doubts regarding the model code, please contact the manufacturer for clarification.
· When placing an order, the user should provide the manufacturer with detailed on-site working conditions, including param eters such as the medium name, temperature, pressure, density, maximum flow rate, minimum flow rate, rated flow rate, and other relevant information.
· Due to the variety of connection and installation types for flowmeters and flow purging devices, the product selection man ual lists only some of the common connection types. For other special connection types and installation heights, please consult the manufacturer.
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