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Introduction

Principle & Structure

Plug-in installation, mechanical flow switch. Built-in micro trigger switch.

Features

Minimal pressure loss, good repeatability, anti-fouling ability, precise switch setting by knob. The mechanical part is safely isolated from the electronic part. There are 5 kinds of baffles in the delivery, which can be used flexibly by the user according to the site conditions when the large pipe diameter is low in flow rate or when the pipe is not full. The same switch can be used for many types of pipes.

Function

Open or close a circuit by detecting whether there is flow in the pipe. It is usually used in heating, air conditioning, refrigeration, water treatment, pressurized water supply, industrial addition and other systems. It can control the following equipment: water pump, burner, compressor, chiller, electric valve, alarm equipment, industrial addition equipment, etc. In the heating system, its role is particularly important. When the return water flow of the boiler system is too low or no flow, it can quickly turn off the burner to prevent the boiler system from drying out and overheating, and avoid frequent intervention of other temperature control components.

technical parameter

Parameter Table 1 Applicable when the pipe diameter is less than or equal to 6”
Install pipe diameterApplicable plate numberpressureAdjustable rangeHysteresis
DNbarL/min (water.air)L/min (water.air)
DN25 「1″」116 or 4020…488
DN32 「1 1/4″」34…10010
DN40 「1 1/2″」65…16014
DN50 「2″」120…28026
DN65 「2 1/2″」210…55018
DN80 「3″」380…75020
DN50 「2″」240…14018
DN65 「2 1/2″」110…34015
DN80 「3″」180…47018
DN100 「4″」350…92020
DN80 「3″」3115…22020
DN100 「4″」210…59020
DN125 「5″」380…120040
DN150 「6″」550…180080
Parameter Table 2 Applicable to when the diameter of the pipe is ≥ 125mm
Interface heightApplicable plate numberpressureAdjustable rangeHysteresisweight
mmbarm/s (water.air)m/s (water.air)kg
25416 or 400.37…1.220.050.55
2550.26…0.860.04
5040.57…1.680.08
5050.33…1.080.05
Note: The above parameters are obtained by installing the switch vertically in the horizontal pipeline and testing with 20°C water as the medium.


Bellows life:500,000 timesmaterialBody: Stainless Steel
Repeatability:±2.5% of total scaleProcess Connection: Bronze Alloy / Stainless Steel
Wiring:Terminal wiringConnecting rod: bronze alloy/stainless steel
Average pressure loss:0.08bar (maximum flow rate)Baffle: 316L Stainless Steel
Ambient temperature:'-25~80℃Protective Shell: Fire Grade Carbonated Polymer
Medium temperature:0…90℃ (-30…350℃)316L Stainless Steel & Die Cast Aluminum
Interface mode:DN25 flange connectionoutputMechanical switch normally open + normally closed
Protection class:IP54&IP6724VDC,15A
Interface mode:DN25 flange connection250VAC,15A
Interface mode:DN25 flange connection380VAC,5A

Selection table

FB30-Baffle flow switch
FB30M-Compact shutter type flow switch
FB30B-High protection grade flow switch (IP67)

Interface thread

Thread interface: NPT1″ (external thread)

Customized (greater than NPT1″)

Wetted part material

Bronze alloy construction UNI EN 12165 CW617N

Stainless steel 1.4301(304) Liquid body

Stainless steel 1.4435 (316L) liquid body

POM plastic material
Protective cover material

Fire-grade carbonated polymer enclosure (IP54)

Die-cast aluminum enclosure (IP67)

316L stainless steel enclosure (IP54)

(special alternative) VARIO

High temperature resistance 350°C (this option needs to choose FB30B body)

DN25 flange interface

High pressure 40bar
The complete data of this selection table, please contact the sales staff or email to sales@kewill-auto.cn for complete samples.
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