English
Español
русский
français
Deutsch
- Products
Piston-Type Pressure Switch
Product Introduction of Piston-type Pressure Switch
The hydro-electric pressure switch type HED 8 is a piston type pressure switch. It basically comprises of housing, installation kit with piston, compression spring, adjustment element and micro switch. If the pressure to be monitored is below the set pressure, the micro switch is operated. The pressure to be monitored is applied via the nozzle at the piston. The piston is supported by the spring plate and acts against continuously adjustable force of the compression spring. The spring plate transmits the movement of the piston onto the micro switch and releases the latter when the set pressure is reached. This switches the electric circuit on or off, depending on the circuit set-up. The mechanical positive stop of the spring plate protects the micro switch in case of a sudden pressure drop from mechanical destruction, and in case of over-pressure. Prevents solid compression of the compression spring.
Technical specification
| Model | HED 8 | ||
|
Pressure range (MPa) (Max setting pressure) |
Max working pressure | Pressure setting range (MPa) | |
| 5 | 35 | 0.2-5 | |
| 10 | 35 | 0.4-10 | |
| 20 | 35 | 0.5-20 | |
| 35 | 50 | 0.8-35 | |
| Working fluid | Mineral oil according to standard Din 51524 (HL, HLP) | ||
| Fluid temp. (°C) | -20~+80 (recommended +40~+50) | ||
| Fluid viscosity (mm2/s) | 20~380 (recommended 30-46) | ||
| Cleanliness | According to NAS 1638 class 9, recommended filter fineness(20≤δ≤50) | ||
| Switching accuracy (repetition accuracy) | <±1% of the set pressure | ||
| Max switching frequency (1/h) | 4800 | ||
| Electrical connection | Din 43650, type A, 3-pole + PE | ||
| Max connection cross sectional area mm2 | 0.5 | ||
| Max contact loading | -AC | 250V; 5A | |
| -DC | 50V/1A; 125V/0.03A; 250V/0.02A | ||
| Protection class as per Din 40 050 | IP65 | ||
| If it is direct-current inductive load, it is necessary to use arc extinguisher for longer serve life purpose. | |||
(For applications outside these parameters, please consult us!)