Function and configurationHydro-electric pressure switches type HED 4 are piston type pressure switches.They basically consist of the housing (1), cartridge with spool (2), compression spring (3), adj...
Product Detail
Function and configuration
Hydro-electric pressure switches type HED 4 are piston type pressure switches.
They basically consist of the housing (1), cartridge with spool (2), compression spring (3), adjustment element (4) and switch (5).
The pressure fluid is applied to the piston (2), then the piston (2) supports itself on the spring seat (6) and acts against the infinitely adjustable force of the compression spring (3).
The spring seat (6) transfers the movement of the piston (2) to the switch (5).
The switch (5) acts on-off as the designing requirement.
Terminal allocation
Circuit example
Ordering code
Technical data
| Fluid | Mineral oil suitable for NBR and FKM seal | ||||||
| Phosphate suitable for FKM seal | |||||||
| Fluid temperature | ℃ | -20~+80(for FKM seal) | |||||
| ℃ | -30~+80 (for NBR seal) | ||||||
| Viscosity range | m㎡/s | 2.8~500 | |||||
| Degree of contamination: | Maximum permissible degree of fluid contamination: NAS 1638 class 9.and ISO4406 20/18/15 | ||||||
| Switching accuracy (repeatiblity) | % | <±1% of setting range | |||||
| Permissible switching frequency | times/min | 120 | |||||
| Electrical connection | Plug-in connector to DIN 43 650 form A, 3...pin+PE | ||||||
| Rated pressure(bar) | Max.setting pressure (bar) | Offset pressure (bar) | Act pressure (bar) | ||||
| min | max | min | max | ||||
| 50 | 50 | 2 | 46 | 4 | 50 | ||
| 100 | 100 | 3 | 89 | 8 | 100 | ||
| 350 | 350 | 322 | 20 | 350 | |||
| Max.connection cross sectional area | m㎡ | 1.5 | |||||
| Protection degree to DIN 43650 | IP 65 | ||||||
| (With DC inductive loading, a spark suppresser m | ust be provided in order to increase the service life.) | ||||||
| Contact load: | AC | 250V/5A | |||||
| DC | 50V/1A,250V/0.2A | ||||||
| Weight | pressure switch | 0.6 | |||||
| stacking plate | 0.8(size 6) | ||||||
| 1.9(size 10) | |||||||
Characteristic curves(Measured at oil=40°C +5°C, using HLP46)
Unit dimensions
Unit dimensions
Unit dimensions
Installation guideline
