Going beyond the mechanical pressure switch
A
Hydac product story
Edited by the Engineeringtalk editorial team
Aug 14, 2001
The EDS 300 is a compact, electronic pressure switch with digital display, with one or two switching points and an optional additional 4 to 20 mA analogue output signal
The EDS 300 is a compact, electronic pressure switch with digital display.
Four different output models are available with one switching point, with two switching points and both models can also have an additional analogue output signal 4 to 20 mA.
The switching points and the corresponding hystereses can be adjusted via keys.
For optimum adaptation to a particular application, the unit has many additional adjustment parameters, e.g switching delay times, N/O / N/C function of the outputs.
The main applications of the EDS 300 are pressure and critical value indications in hydraulics and pneumatics and anywhere where a high switching frequency or a constant switching accuracy places too high a demand on a mechanical pressure switch.
The unit is ideal for the construction of accumulator charging circuits or pump and compressor controls.
Special features are: Built-in pressure sensor with DMS on stainless steel membrane; Compact, robust construction; Accuracy class 1%; 3-digit digital display; Simple operation due to key programming; Switching points and switch-back hystereses can be adjusted independently; Window function; Many useful additional functions.
Setting Options: All the settings available on the EDS 300 are combined in two easy-to-follow menus.
To prevent unauthorised adjustment of the unit, a program disable can be activated.
Switching point/Switch-back point: The switching point is defined as being the pressure value, which when it is reached (whilst pressure is increasing) causes a change in the switching output.
This output state is maintained until the pressure falls below the switch-back point allocated to the switching point.
The switch-back point is determined by the switch-back hsysteresis which has been set (switching point minus switch-back hysteresis = switch-back point).
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