Introduction Sensors For Instrumentation - VDO SENSORS - INSTRUMENTATION V3.0 Manual

Introduction Sensors for Instrumentation
6
Pressure Senders
For measuring gas or fluid pressure in
connection with an electrical display unit.
Some senders are earthed. Other senders
are not earthed, i.e. earth is supplied by
a separate connection. Pressure senders
can be fitted with an additional warning
contact in order to indicate when the
pressure limit has been reached, as well as
carrying out continuous measurement.
Pressure Switches
For monitoring the pressure of gases and
fluids by making contact when a pre-
defined limiting value is exceeded or not
reached. Some switches are earthed.
Other switches are not earthed, i.e. earth is
supplied by a separate connection.
The pressure sender types in the product
range include:
• Without Warning Contact, Common
Ground
• With Warning Contact, Common Ground
• Without Warning Contact, Insulated
Return
• With Warning Contact, Insulated Return