STFS-20 Seal Type Paddle Flow Switch
Product Description
The STFS-20 Seal Type Paddle Flow Switches are Single - Pole, Double - Throw (SPDT) flow switches that are used in liquid lines carrying water ,ethylene glycol,or other liquids not classified as hazardous. They can be wired to energize one device and de-energize another device powered from the same source when liquid flow either exceeds or drops below the set flow rate.
Note: The STFS-20 Seal Type Paddle Flow Switches can not be used where the liquid in the pipes will drop below the liquid's freezing point, causing an internal freeze-up.
Seal flow switch is one of the main products of Canto Switches with good price and quality, factory direct sales and factory supply. with various products on sale and Discount.Our company is a professional supplier and manufacturer in China.
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Dimension Chart (mm)  |
Wiring Chart  |
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CAUTION: Equipment damage hazard. Sealed settings(screws marked with black paint) are not intended to be changed. Adjustment attempts may damage the control or cause loss of calibration, voiding the warranty. |
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Standard Installation  |
Mounting: Flow switch should be mounted in a horizontal pipe line or vertical pipe line. Mount the instrument in a section of pipe where there is a straight run of at least 5 pipe diameter on each side of the flow switch.
1.Remove switch cover. 2.For higher flow rate-turn range adjusting screw clockwise. 3.For lower flow rate-turn range adjusting screw counterclockwise. 4.Make sure flow switch cover is assembled before leaving. |
Electric Parameter
| Current (A) ╲Voltage (V) | A.C.110 | A.C.220 | |
| Non-inductive Current | 16 | 16 | |
| Inductive Current | Full load | 16 | 8 |
| Starting | 96 | 48 | |
STFS-20 Seal Type Paddle Flow Switches 1~3" Paddle
| Required to Actuate Switch(m³/h) | ||||||
| Pipe Size(mm) | 25 | 32 | 40 | 50 | 65 | |
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Minimum Adjustment |
Flow Increase R to Y Closes |
0.95 | 1.32 | 1.70 | 3.11 | 4.09 |
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Flow Decrease R to B Closes |
0.57 | 0.84 | 1.14 | 2.16 | 2.84 | |
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Maximum Adjustment |
Flow Increase |
2.0 | 3.02 | 4.36 | 6.6 | 7.84 |
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Flow Decrease R to B Closes |
1.93 | 2.84 | 4.09 | 6.13 | 7.27 | |
| Required to Actuate Switch(m³/h) | ||||||
| Pipe Size(mm) | 80 | 100 | 125 | 150 | 200 | |
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Minimum Adjustment |
Flow Increase R to Y Closes |
6.24 | 14.8 | 28.4 | 43.2 | 85.2 |
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Flow Decrease R to B Closes |
4.32 | 11.4 | 22.9 | 35.9 | 72.7 | |
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Maximum Adjustment |
Flow Increase |
12.0 | 29.1 | 55.6 | 85.2 | 172.6 |
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Flow Decrease R to B Closes |
11.4 | 27.7 | 53.4 | 81.8 | 165.8 | |
STFS-20 Seal Type Paddle Flow Switches 6" Paddle
| Required to Actuate Switch(m³/h) | |||||
| Pipe Size(mm) | 100 | 125 | 150 | 200 | |
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Minimum Adjustment |
Flow Increase R to Y Closes | 8.40 | 12.9 | 16.81 | 46.56 |
| Flow Decrease R to B Closes | 6.13 | 9.31 | 12.26 | 38.61 | |
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Maximum Adjustment |
Flow R to Y Closes R to Y Closes | 13.4 | 26.8 | 32.70 | 94.26 |
| Flow Decrease R to B Closes | 17.3 | 25.21 | 30.66 | 90.85 | |
STFS-20 Seal Type Paddle Flow Switches Other Parameters
| Thread | Bellows/Paddle | Paddle Size |
| 3/4"-14NPT | Phosphor Bronze/Stainless Steel | 1", 2", 3", 6" |
| Liquid Temp (°C) | Max. Pressure(bar) | Shell | Type |
| -25 ~ 120 | 15 | IP65 Plastic Shell | STFS-20 |
Note: due to continuous product improvement, the appearance of the actual product may differ slightly.
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