Paddle type water flow switch
Description
The shell of KWFS water flow switch is made of ABS&PC composite
material, which has the characteristics of corrosion resistance and
high temperature resistance, making it suitable for relatively
harsh working environment. At the same time, the protection grade
of IP65 makes it effectively protect internal components and
prolong the service life of the equipment.
Application
Control and monitor liquid flow of boilers, pumps, etc., of
heating, cooling, and air conditioning equipment.
Features
● Flow control of water and normal media
● Renovated SPDT micro switch ensures the reliable switch function
●15(8A)250VAC switch rating
● IP65, class I enclosure
● Set point adjustable
● Stainless steel paddle
●Brass material
● Max. liquid temp 120℃
● Max working pressure 20Ba
Specifications
| Type of operation | On/Off,single-stage,micro switch |
| Output | SPDT 15(8A) 24/250VAC |
| Flow rates | See flow rate table |
| Flow rate setting adjustment | Internal screw |
| Sensing element | Paddle |
| Liquid applications | Hot, chilled, well, pool and sea water,Brine or ethylene glycol |
| Parts material in contact with fluid | Brass |
| Paddle material | Stainless steel |
| Liquid temperature | -20℃~120℃ |
| Permissible ambient temperature | -40℃~85℃ |
| Permissible ambient humidity | 10…90% RH, non-condensing |
| Cable entry | M18 Fitting |
| Housing | Fire Resistance ABS or PC |
| Protection | IP65 |
| Color | White |
| Weight | 1.0Kg |
Types of Model
| Model | Connection |
| KWFS-1 | 1/2" -14 NPT |
| KWFS-2 | 3/4" -14 NPT |
| KWFS-3 | 1" -11½ NPT |
Liquid Flow Rate Table
| Line Pipe Size(in.) | 1 | 1-¼ | 1-½ | 2 | 2-¼ | 3 | 4 | 4Z | 5 | 5Z | 6 | 6Z | 8 | 8Z |
| Min.flow | Flow Increase
①&②Connected | 4.2
(1.0) | 5.8
(1.3) | 7.5
(1.7) | 13.7
(3.1) | 17.6
(4.0) | 27.5
(6.2) | 64..7
(14.7) | 35.2
(8.0) | 125
(28.4) | 57.01
(12.9) | 190.0
(43.1) | 74.0
(16.8) | 374.7
(85.1) | 204.7
(46.5) |
Flow Decrease
①&③Connected | 2.5
(0.6) | 3.7
(0.8) | 5.0
(1.1) | 9.7
(2.2) | 11.9
(2.7) | 19
(4.3) | 50.1
(11.4) | 26.9
(6.1) | 101.1
(22.9) | 41.0
(9.3) | 158.0
(35.9) | 54.0
(12.3) | 319.7
(72.6) | 170.0
(3806) |
| Max.flow | Flow Increase
①&②Connected | 9.2
(2.1) | 13.3
(3.0) | 17.6
(4.0) | 26.9
(6.1) | 30.8
(7.0) | 50.2
(11.4) | 127.6
(29.0) | 81.0
(18.4) | 245.0
(55.6) | 118.0
(26.8) | 374.7
(85.1) | 144.0
(32.7) | 759.5
(172.5) | 415.0
(94.2) |
Flow Decrease
①&③Connected | 8.1
(2.0) | 12.5
(2.8) | 16.3
(3.7) | 25.1
(5.7) | 28.6
(6.5) | 47.1
(10.7) | 122.0
(27.7) | 76.2
(17.3) | 234.7
(53.3) | 111.0
(25.2) | 359.7
(81.7) | 134.7
(30.6) | 729.6
(165.7) | 400.6
(90.8) |
Note:
①For flow rates with suffix "Z", the 6 inch paddle must be
installed.
②The flow rate unit of the above table is GPM (m /h)
Electrical Wiring
Installation
The flow switch can be installed in every position far from elbows
or throttlings, with arrow on flow direction. If pipe is vertical,
recalibrate range to balance paddle weight. If the device is
downwards mounted, take care to slags and apply it in a straight
pipe that is far from filters,valves,etc.,with length at least 5
times the diameter of pipe upstream and downstream the unit.
Note:
The flow switch is factory calibrated at its minimum sensitivity.To
increase the set valve,turn the adjustment screw clockwise.The
cut-out valve must be ≥the minimum flow necessary to guarantee the
protection of the plant.
Dimensions (mm)
Paddles
| Install Paddle |
| Pipe | NO. |
| 1" | 1 |
| 11/4" | 1 |
| 11/2" | 1 |
| 2" | 1,2 |
| 21/2" | 1,2 |
| 3" | 1,2,3 |
| 4" | 1,2,3 |
| 4"Z | 1,2,3,4 |
| 5" | 1,2,3 |
| 5"Z | 1,2,3,4 |
| 6" | 1,2,3 |
| 6"Z | 1,2,3,4 |
| 8" | 1,2,3 |
| 8"Z | 1,2,3,4 |
