WIKA 712.15.160 Betriebsanleitung Seite 19

4. Commissioning, operation
Magnetic snap-action contacts (option)
Electrical switch contacts for level indicators and/or working pressure open circuits as a
function of the pointer position of the indicating measuring instruments.
Version
Single and double magnetic snap-action contact, model 828
The modular switch contact is an add-on unit, which can be built onto the pressure gauge
within a few minutes. The switch contacts provide IP65 ingress protection. The connection to
the actual value pointer is made by means of a special yoke so that a carrier pin at the pointer
itself is not needed. Due to this simple mounting, the instrument can be converted into a
contact pressure gauge extremely quickly and at low cost.
The switch contacts mainly comprise:
the already wired switch contact equipped with a special foot and a fork coupling
■
a transparent hood (polycarbonate) with dovetail guide into which the switch contact
■
containing the special foot is slid and fastened by means of a cross-head screw
a connector lower part (4-pin) moulded or welded to the transparent hood
■
an adjustment lock mounted in the centre of the transparent hood
■
The set value pointer of the
installed switch contacts are
adjusted, from the outside, to
the value at which the switching
operation is to take place, using
the adjustment lock with a
separate or integral key.
The switch contacts are desig-
ned to allow the instrument
pointer to move beyond the
adjusted actual value pointer
after contact actuation takes
place, with the contact remai-
ning actuated.
This design guarantees a
stable switching status corre-
sponding to the position of the
actual value pointer in case of
power failure.
Differential pressure gauge models 712.15.160, 732.15.160, optional for hazardous areas
Connector screw
Coupler connector
with cable
Connector sealing
Connector lower part
Product label screws
Product label
Front panel
Connection
Transparent hood
spiral tube
Special foot with dovetail
guide
Adjustment key
Adjustment lock
Lock latch
Adjustment pin
Contact arm with
Coupling fork
leaf spring
Ruby bearings
Rotation pin of coupling fork
EN
Carrying arm
Contact pin
Magnet carrying
plate
Screw-in magnet
Red set pointer
Bayonet rim
19