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951-150-037-EN
Version 01
EN
3.
Overview, functional description
In cases of other piston detectors, with
and without adapter, the metering device
must first be depressurized. If an adapter is
already mounted, then it must be replaced
with the new adapter (see Figure 1).
Problems cannot occur in the stopper pres-
sure range of the sensor surface/meter-
ing device if using piston detectors with
adapters.
3.5 System design of metering device
adapter and piston detector
The piston detector 2340-00000026 is a
position sensor that, together with a pres-
sure-resistant adapter, is screwed into the
respective metering device.
Through the closed adapter, the sensor
detects 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 detector.
There are different adapters depending on
the metering device series. These differ in
terms of thread size and clearance. Another
feature is the wall thickness resulting from
the fixed nominal distance between the
metering device piston and the active sensor
surface.
If a
piston detector of series
2340-00000026 is already installed, the
piston detector can be replaced subsequent-
ly during operation.
However, the adapter
must
not
be removed while removing the
existing piston detector!
3.5.1 Function
Piston detector 2340-00000026 is de-
signed as a circuit closer (normally open
contact).
When the piston detector is actuated (piston
stroke), it closes and sends its output signal
(+) to the outlet (2/4). The signal lasts as
long as the piston detector is actuated by the
metering device piston.
At the same time as actuation, a yellow LED
lights up and indicates correct functioning of
the piston detector.
The piston detector automatically detects
the customer’s plug/cable assignment,
2-wire design or 3-wire design (with cable
break protection). The possibility of a wiring
error is thus excluded.
The piston detector, with the corresponding
adapter, is intended as a replacement for all
previous detectors.
