The ALFK-340 series is based on the principle that the magnetic float rises and falls synchronously with the liquid level. When the magnetic float, along the guide rod, reaches the position where the reed switch is installed, the reed switch is closed or released, and the corresponding digital signal is output. This signal can be directly input to the PLC and flash alarm for automatic level control and alarm. It is matched with the signal converter or input to the PLC to directly drive the 220VAC control circuit for automatic motor and valve control.
Key Technical Specifications
· Detection range: 100 mm ~ 6000 mm
· Control accuracy: ±10 mm
· Contact capacity: 24VDC, 0.5A (resistive); 220VAC, 1A, available for special requirements of users
· Explosion-proof grade: Intrinsically safe Exia IIC T4-T6 Ga Flameproof Exd IIC T4-T6
· Specifi cation of float: φ92, φ84, φ54, φ48, φ25 (for special requirements, φ140 and φ76 are available)
· Float material: 304, 316L, PP · Operating temperature: -10 ~ 120° C
· Operating pressure: -0.1MPa~2.5MPa
· Specification of connecting flange: DN100 (DN50, DN25), PN1.0 (PN1.6)
· Electrical interface: M20×1.5 internal thread
· Connecting flange standard: HG20592~20635-97. Other standards (such as GB, JB, ANSI, and JIS) used by the user shall be indicated at the time of ordering.
System Connection
The output signal of the level switch is connected with PLC and other systems for use. When the user uses the level switch as control and alarm signal, if the control (alarm) loop voltage is greater than 36VAC(DC), the user should equip the switch with a signal converter, which can convert the reed switch signal of the level switch into a relay signal with larger capacity, to ensure the safety and reliability of the level switch and prolong the service life.
Comparison Table of Float Specifi cation, Material, Adapter Flange, Operating Pressure and Temperature
| Float specification |
φ92 |
φ84 |
φ48 |
| Float material |
304(316L) |
PP |
304(316L) |
| Specifi cation of adapter flange |
>DN100 |
>DN100 |
>DN50 |
| Applicable pressure |
1.0MPa |
Normal pressure |
2.5MPa |
| Applicable temperature |
120ºC |
60ºC |
120ºC |
Model and Specification Table
| 1 |
1 magnetic float and 1 control point |
Number of floats; number of control points |
| 2 |
2 magnetic floats and 2 control points |
| 3 |
3 magnetic floats and 3 control points |
| 4 |
4 magnetic floats and 4 control points |
| |
A5 |
DN50 PN1.6(HG/T20592-2009) |
Connection mode |
| A8 |
DN80 PN1.6(HG/T20592-2009) |
| A10 |
DN100 PN1.6(HG/T20592-2009) |
| B5 |
DN50 Class150(ANSI B16.5) |
| B8 |
DN80 Class150(ANSI B16.5) |
| B10 |
DN100 Class150(ANSI B16.5) |
| C |
Others |
| |
A |
Guide rod material: stainless steel 304 |
Guide rod material |
| B |
Guide rod material: stainless steel 316L |
| P |
Guide rod material: stainless steel, case material: PP |
| F |
Guide rod material: stainless steel, case material: PTFE |
| |
P |
Ordinary (waterproof) |
Explosion- proof type |
| D |
Explosion-proof type |
| B |
Intrinsically safe |
| |
- |
Installation height (mm) |
Installation height |
| |
L1U/L1D |
Upward movement of first control point/downward movement of fi rst control point |
Movement method of control point |
| L2U/L2D |
Upward movement of second control point/downward movement of second control point |
| L3U/L3D |
Upward movement of third control point/downward movement of third control point |
| L3U/L4D |
Upward movement of fourth control point/downward movement of fourth control point |
| |
K |
Normally open contact |
Contact type |
| B |
Normally closed contact |
| |
- |
Density g/cm3 |
Density |
|
D |
Operating pressure: normal pressure |
Operating pressure |
| - |
Actual operating pressure (MPa) |
Other special requirements can be indicated at the time of ordering!
Packaging & Delivery
| Category |
International Commercial Terms (Incoterms) |
Terms of Payment |
Nearest Port |
| ALFK-340 Top-mounted Connecting Rod Float Level Switch |
CIF, CFR, DAP |
LC, T/T, D/P |
Shanghai, Guangzhou, Tianjin |
Company Profile
Audited Supplier 
){kind=link}
){kind=link}