ELECTRIC FLOW SWITCHES
The electric flow switches are used to set or break an electric contact in automation installations when reaching a limit of the flow speed of a fluid through a pipe.
The electric flow switches are manufactured in two constructive types:
1. electric flow switches with stainless steel bellows
- for hazardous area (former name: "Universal Electric Flow Switch")
- for non-hazardous area (former name: " Electric Flow Switch with Bellows").
2. electric flow switches with magnetic transmission with separation by diamagnetic wall for hazardous area:
- tilting (former name: "Electric flow signaler", SEC1 type)
- rotary (former name: "Rotary electric flow switch ", SEC2 type).
For both constructive types, connection within the electrical scheme shall be made by cable having minumum section of 1,5 mm², approved for usage in explosive. Full diameter of the cable shall be between 8 and 14 mm, according to the inside diameter of the jig bushing.
TECHNICAL DATA
- Signalling range for electric switches with bellows according to table no.1
Table no. 1
|
Nominal diameter ND (mm) |
15 |
20 |
25 ... 40 |
50 |
65 ... 200 |
|
Fitting cf. fig. 1, 2, 4 , 5 |
1,5 ... 12,5 |
1 ... 9,5 |
0,3 ... 8 |
0,2 ... 4,5 |
- |
|
Fitting cf. fig. 3 *) |
- |
- |
- |
- |
0,2 ... 4 |
*) At this mounting type, on special order, it can be used for pipes up to DN = 800 mm.
- Kinematic viscosity: 0.5 ... 60 cSt
- Max. pressure of the fluid: 25 bar
- Max. temperature of the fluid: 110 °C – for hazardous area;
50 °C – for non-hazardous area
- Working environment: fluids compatible with
austenitic stainless steels
- Working voltage: 220V/125V/50Hz or 48V c.c.
- Hazardous classification: ExdIIBT4
- Normal degree of protection: IP54 - for normal type
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