HF68 Series Flow Switch
Application:
This switch is a single pole double throw (SPDT) flow switch, used to detect and observe the liquid flow rate relay, normally for air adjustment and applications in the field of water supply equipment. It is used to sense the change of the flow rate of the liquid, such as water, ethylene, glycol or other non-hazardous liquid passing through the pipeline, with the typical application as locations where the interlocking effect or “ flow breaking” protection is necessary.
Size and specification:
Case 64×64×48mm (Type:HF68S Stainless Steel)
Case 64×64×48mm (Type:HF68A Brass Type)
Case 52×52×48mm (Type:HF68B Brass Type)
Case 64×64×48mm (Type:HF68P with a nylon connector)
Electric parameters:
Rated value of the switch connector:
5A, 1/4HP, 125VAC~250VAC
10A，1/4HP，125VAC~250VAC
15A, 1/2HP, 125VAC~250VAC
Micro switch has follow certification standards:
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Parameter:
Max.working pressure:
1.6Mpa (Type: HF68A, HF68B)
1.6Mpa (Type: HF68P)
Connector: 1’NPT, 3/4’NPT, 1/2’NPT
Range of flow：
- 18L/M~2000L/M（standard）
- 5L/M~3000L/M（nonstandard）
Liquid temperature:
- -20℃~120℃ (Type: HF68A, HF68B)
- -45℃~260℃ (Type: HF68S stainless steel )
- -25℃~100℃ (Type: HF68P nylon connector )
Wiring:
Typical Flow Rates
Table 1
Required to Actuate Switch (m3/hr) |
Pipe Size (in.) |
1 |
1 1 /4 |
1 1 /2 |
2 |
2 1/2 |
3 |
4 |
5 |
6 |
Minimum
Adjustment |
Flow Increase
1-2（C- A） close |
0.88 |
1.4 |
1.8 |
2.6 |
3.3 |
4.1 |
5.4 |
8.0 |
10.8 |
Flow Decrease
1-4（C-B）close |
0.71 |
1.1 |
1.47 |
1.9 |
2.3 |
2.4 |
3.9 |
5.8 |
7.9 |
Maximum
Adjustment |
Flow Increase
1-2（C-A） close |
7.32 |
12.1 |
16.6 |
23.7 |
25 |
31 |
43.9 |
68.7 |
99 |
Flow Decrease
1-4（C-B） close |
5.10 |
8.3 |
10.7 |
13 |
20 |
24 |
33 |
47 |
63 |
Supply 8-inch flow paddle for special requirement
HF67 Airflow Switch
Application
This switch is a SPDT type airflow one and can be used for detecting on -off status of the airflow to ensure normal operation of system. This product can be used for any detection conditions with various filtrated airflow rates, such as environmental engineering, central air-conditioner, business office building and factory etc.
In an air treatment, it can adopt the control switch to setup acoustic-optical alarm device for cut-out or chained action of switching off circuit of heater and electric valve to avoid harmful effect on equipment and users resulting from overheat of vent-pipe, freezing of coil pipe and others when cut-off happens.
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Range of airflow: 2~8m/sec.
Temperature range: 82℃
Electric parameters:
Rated current of switch contact: 10.1A
Rated voltage: 125/250VAC, has follow standards:
HF78 Flow Switch
Application:
Protect your precious equipment from the fault of cold-producing medium, such as power supply, semiconductor equipment, water treatment, water heater, etc. In addition, the switch will ensure proper lube flow in the axletree or gear wheel, to protect the system from stopping, such as printing equipment, android system, etc.
Performance parameter:
The switch has follow standards: 
MAX. working pressure: 38kg liquid temperature: 0℃～+80℃ or 0℃～+100℃
Contact rating: 0.5A, 170VDC primary material: PP plastic, alnico, stainless steel
Connector: 1/4”NPT male screw setting of flow rate: 0.5L/M~5L/M |
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