Keram (Nanjing)ELECTRICAL Equipment Co., Ltd.
Keram (Nanjing)ELECTRICAL Equipment Co., Ltd.
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KWFS series water flow switch is a flow switch that can be used under the medium temperature of - 20~120 ℃. Its unique housing material allows its working environment temperature to reach - 40~85 ℃, which can meet the requirements of some customers for the use environment. Its IP65 protection level allows it to effectively protect internal components and extend the service life of the equipment.
The working principle is that when the fluid rushes towards the blade, the blade swings, changing the relative position of the magnet and the reed contactor, activating the contactor to make it close or open. Once the fluid is interrupted, the blade returns to its initial position, again activating the reed contactor. The mutual repulsion of the two magnets provides the force required for the flow switch to reset, and the contactor returns to its previous state
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
| 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 |
| 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 | 4.2 | 5.8 | 7.5 | 13.7 | 17.6 | 27.5 | 64..7 | 35.2 | 125 | 57.01 | 190.0 | 74.0 | 374.7 | 204.7 |
| Flow Decrease | 2.5 | 3.7 | 5.0 | 9.7 | 11.9 | 19 | 50.1 | 26.9 | 101.1 | 41.0 | 158.0 | 54.0 | 319.7 | 170.0 | |
| Max.flow | Flow Increase | 9.2 | 13.3 | 17.6 | 26.9 | 30.8 | 50.2 | 127.6 | 81.0 | 245.0 | 118.0 | 374.7 | 144.0 | 759.5 | 415.0 |
| Flow Decrease | 8.1 | 12.5 | 16.3 | 25.1 | 28.6 | 47.1 | 122.0 | 76.2 | 234.7 | 111.0 | 359.7 | 134.7 | 729.6 | 400.6 | |
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)
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.
| 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 |