3. Overview/functional description
3
3.7 Design and functional description of piston detectors
3.7.1 Piston detector design
The universal piston detector
234-13163-9 and the bipolar piston detec-
tor 234-11454-1 are position sensors that,
together with a pressure-resistant adapter,
are screwed into the progressive metering
device.
Through the closed adapter, the sensors
detect the metering device piston without
coming into direct contact with it.
Hydraulic pressure spikes therefore do not
act directly on the front sensor surface of
the piston detectors.
There are different adapters depending
on the progressive metering device series.
These differ in terms of thread size and
clearance. They are specifically tailored to
the respective progressive metering device
type and piston type.
The piston detectors automatically detect
the clearance between the metering de-
vice piston and the piston sensor following
several metering device strokes and adjust
themselves automatically.
The universal piston detector automatically
detects the customer’s plug/cable assign-
ment, 2-wire design or 3-wire design (with
cable break protection).
The universal piston detector can be used
for new lubrication systems. If replacing
parts, it is not suitable for use in vehicle
applications with a KFAS, KFBS or KFGS lu-
brication pump due to the undefined pin as-
signment. The bipolar piston detector should
be used in this case.
The bipolar piston detector is available only
in a two-wire design. The signal voltage can
be applied to either pin 1 or pin 4.
3.7.2 Function
When the piston detector is actuated (piston
stroke), a yellow LED lights up and indicates
correct functioning of the piston detector.
The piston detector can be replaced sub-
sequently during operation. However, the
adapter must not be removed while remov-
ing the previous piston detector!
Problems cannot occur in the stopper pres-
sure range of the sensor surface/progres-
sive metering device.
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951-230-008-EN
Version 04
EN
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