BRIEF INFORMATION
about air pressure switches
PRODUCT FEATURES
Application
➔ Depending on the version, air pressure switches use medium pressure to provide electrical feedback, i. e. to connect or disconnect electrical devices or lamps.
➔ Air pressure switches uses springs and diaphragms to control at what pressure the switch is triggered. The springs forces are opposing the pressure of the inlet medium. The spring preload correlates with the pressure at which the switch makes electrical contact. When the pressure drops, the switch is reset to its original state.
➔ Typical applications are pneumatic control systems, diverse applications in pneumatic braking systems or door opening systems.
➔ 10 different HELLA parts for WABCO air brake systems.
➔ Different applications for most common 24 V applications: Mercedes, MAN, Iveco, Scania, Volvo, Renault, Neoplan, Setra, Irisbus, Solaris, Evobus, Irsisbus.
Basic design and function
➔ Air pressure switches either break or make contacts, applications designed for different switching pressures.
➔ Air pressure switches are intended for general appl. in pneumatic devices and systems in motor vehicles to signalise the pressure drop or rise.
➔ Mechanical diaphragm pressure switches are pressure-tight with respect to the medium to be measured.
➔ The compressed air is generated, controlled and stored by the compressor, air dryer, pressure regulator and storage tank.
Mounting
➔ Easy to mount due to 1:1 replacements in OE quality.
TECHNICAL DETAILS
| Technical data | |
|---|---|
| Operating pressure | 12 bar |
| Bursting pressure | 30 bar |
| Switching pressure | In the range from 0.15 bar to 6.6 bar (factory set) |
| Medium | Air |
| Switching capacity | Max. 30 W (at ohmic load) |
| Rated voltage | 12 V/24 V |
| Measuring range | 0.3, 0.5, 2, 4, 3.5, 4.1, 4.5, 5.5, 6.0 (bar) |
| Measuring range (static and dynamic) | (±10%) |
| Operating temperature | (-40 °C to +80 °C) |
| Protection class | Body IP 60, electrical terminal IP 00, switch with protective sleeve IP 65 |
| Permissible | Mounting torque max. 30 Nm(M12x1.5) max. 18 Nm (M10x1) |
| Threaded bolt, ground connection | M10x 1, M12 x 1.5 |
| Material | Brass terminals |
| Contact pin | Terminals 6.3 mm x 0.8 mm |
| Pin coating | Silver-coated |
| Casing type | Steel, zinc-coated (without Cr-VI) |
| Actuations | Air pressure |
| Thread connections (pressure ports) |
|---|
NOC – normally open
The contacts are open when there is no media pressure and closed (i. e., conduct electricity) when the device is activated and the pressure setting is reached.
NCC – normally closed
The contacts are closed when there is no media pressure and open (i. e., stopping conduction) when the device is activated and the pressure setting is reached.
Available as NOC (normally open) or NCC (normally closed) switch, depending on the application.