Switch Contacts (Optional) - WIKA 712.15.100 Mode D'emploi

9. Switch contacts

9. Switch contacts (optional)

These switch contacts are fitted into the case of a pressure gauge and intended to make or
break an electric control circuit triggered by the position of the instrument's pointer.
Versions
Single and double magnetic snap-action contacts or single and double inductive alarm
sensors. Please refer to data sheet AC 08.01 for technical data.
The modular switch contact is a self-contained unit, which can be built onto the pressure
gauge within a few minutes.
The switch contacts provide IP65 ingress protection even for oil-filled gauges. The connec-
tion to the instrument pointer is made by means of a special fork so that a carrying pin at
the pointer itself is not necessary. By means of this simple mounting, the instrument can be
converted into a contact measuring instrument quickly and inexpensively.
The switch contacts mainly comprise:
the pre-wired switch contact, which is provided with a special foot and a fork coupling
„
a transparent hood (polycarbonate) with dovetail lead into which the alarm contact is
„
pushed and which is fastened by means of a recessed head screw
a 4-pin plug socket, injection-moulded or welded to the transparent cover
„
an adjustable lock, mounted in the middle of the transparent cover.
„
The set pointers of the built-in
switch contact are adjusted, to
the value at which the contact
should switch, from the outside
via the adjustable lock using a
separate or a rigidly mounted
key.
The switch contacts are
designed to allow the instru-
ment pointer to move beyond
the adjusted set pointer after
contact actuation takes place,
with the contact remaining
actuated.
The design therefore guaran-
tees a stable switching condi-
tion, which corresponds to
the position of the instrument
pointer, even if the power fails.
WIKA operating instructions differential pressure gauge models 712.15.100, 732.15.100
Plug screw
Plug with cable
Plug seal
Plug socket
Type plate screws
Type plate
Front plate
Connection
Transparent hood
Spiral spring
Special foot
with dovetail lead
Spanner
Adjustable lock
Metal flag
Adjustable pin
Contact arm with
Coupling fork
plate spring
Ruby bearing
Carrying pin of coupling fork
GB
Carrying arm
Contact pin
Magnet carrying
plate
Screw-in magnet
Desired value
indicator, red
Bayonet rim
13