Replaceable dwyer air flow switch
Description
The duct air flow switch provides feedback of air flow in HVAC duct
work. It can be directly connected to the control system as a
feedback point or interlocked to prevent operation of heating and
cooling equipment when there is no air flow. The stainless steel
paddle resists corrosion. An adjustable spring tension screw allows
setting the air flow trip point from 200 to 1800 FPM (1 to 9.2
m/sec). The paddle can be trimmed down for higher flow
applications. The cable enters through the water tight gland, or
the gland can be removed and replaced with an EMT or flex connector
for wiring with EMT or metal flex.
Application
Control and monitor air and non aggressive gases flow in ducts,
chambers, etc.,of heating, cooling, and air conditioning equipment.
Features
● Renovated SPDT micro switch ensures the reliable switch function
● Stainless steel paddle
● Cut-in and cut-out
● Brass level
● IP65
Technical data
| Model | KAFS |
| Type of operation | On/Off,single-stage,micro switch |
| Flow rate switching | |
| - Cut-out | Min. 1.0 m/sec, Max. 8.0 m/sec |
| - Cut-in | Min. 2.5 m/sec, Max. 9.2 m/sec |
| Flow rate setting adjustment | Internal screw |
| Sensing element | Paddle |
| Paddle size | 3.2 x 6.9 in. (80 x 175 mm) |
| Paddle w/level - Length | 7.9 in. (200 mm) |
| Flow applications | Air and non aggressive gases |
| Paddle material | Stainless steel |
| Paddle level material | Brass |
| Permissible ambient temperature | |
| - Housing | -40℉ to 185℉(-40℃ to 85℃) |
| - Paddle | 14℉ to 185℉(-10℃ to 85℃) |
| Permissible ambient humidity | 10...90%RH,non-condensing |
| Cable entry | M18 fitting |
| Housing - Material | Base:Steel,galvanized; Cover:ABS,fire retardant or PC |
| - Color | white |
| - Protection | IP65 |
| Installation | Duct mounted |
| Ship weight | 0.7kg |
Installation
The flow switch should be mounted into a duct or chamber where the
air paddle can freely point horizontally downwards. To avoid air
swirl and paddle instability, straight zones should be provided for
a length of 5 times the diameter of duct upstream and downstream
from the installation location.
Note:
The units are factory calibrated to the minimum switch-off value.
To increase the set value, adjust the range screw clockwise. Due to
the risk of fracture at air speeds of higher than 5.0 m/sec, the
paddle must be cut off on the marked side. When the paddle is cut
off, the minimum cut-out value increases from 1.0 m/sec to 2.5
m/sec.
Electrical Wiring
Dimensions (mm)
FAQ
1 Q: What's the delivery time?
A: According to the specification and quantity of your order,
generally 4
days for normal standard products within 10pcs.
2 Q:Are you manufacturer or trading company?
A: We are manufacturer with many years of experience.We have our
own factory.Welcome to visit our factory.
3 Q: Can we use our logo on the products?
A: Yes.We can provide OEM service.
4 Q: Do you have products with ex-proof certificate?
A: Yes,we can offer intrinsic-safety and flame proof certificates.
5 Q: What is the warranty of your products?
A: Normal is 12 months.
6 Q: What's the means of transport?
A: Express such as TNT,Fedex,DHL,UPS, or logistics by indicator.
