Pressure switch for permanent switching accuracy
A
Hydac product story
Edited by the Engineeringtalk editorial team
Aug 14, 2001
The EDS 1700, with its built-in pressure measuring cell, a 4-digit display and the 4 switching outputs, offers the user all the advantages of a modern electronic pressure switch.
The EDS 1700, with its built-in pressure measuring cell, a 4-digit display and the 4 switching outputs, offers the user all the advantages of a modern electronic pressure switch.
Four switching points and switch-back points can be adjusted very simply and independently of each other via a membrane keypad.
For optimum incorporation into monitoring systems (e.g with PLC), an analogue output is also available (4 to 20 mA or 0 to10 V).
The main applications of the EDS 1700 are in hydraulics and pneumatics.
The instrument is ideal for use where frequent switching cycles (several million) require permanent switching point accuracy or simple and precise adjustment.
Special features are: Built-in pressure sensor with DMS on stainless steel membrane; Accuracy class 0.5% or 1%; 4-digit digital display; 4 critical value relays, switching points and switch-back points can be adjusted independently; Option for analogue output signal; Many useful additional functions; Optional mounting position (pressure connection on the top/bottom, keypad and display can be turned through 180o); Adjustment of display ranges to indicate values in, for example, kN, kg, psi.
Setting Options: The heart of the instrument is a microcomputer which provides many useful extra functions in addition to normal pressure switch operation.
It is possible, for example, to activate switching delay times to prevent fast pressure peaks from triggering an unwanted switching cycle.
All settings are made via a membrane keypad.
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).
Assembly: When used in critical applications (e.g strong vibrations or knocks) the ETS 1700 must be mounted on rubber buffers (DIN vibration mounts).
The pressure connection must by via Minimess line for mechanical decoupling.
The EDS 1700 must not be installed using rigid piping.
When supplied, the sensor connection is accessible from the bottom and the electrical connection is accessible from the top.
Depending on the application, the front panel of the instrument can be turned through 180deg so that the electrical connection can be made from underneath and the sensor connection can be made from the top.
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