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In practice
the requirement often arises to convert the measurement
signals of a sensor into a standard signal in the
simplest possible manner in the immediate proximity of
the sensor. This permits trouble-free, low-loss
transmission of measured values over longer distances to
an instrument board or plant controls.
Ideally suited for this purpose is the in-line measuring
amplifier, which is inserted in between in the
connection cable by means of plug contacts. Owing to its
compact, robust design and low weight, it finds use in
almost any application. Even movable locations subject
to forces of acceleration, for example manipulators,
present no problems. It is intended mainly for use
outside control cubicles in just about any location and
is matched to a specific sensor. The aluminium housing
is extremely sturdy and affords the greatest possible
protection even in harsh environments.
Users who wish to integrate the amplifier in an existing
circuit board or in a housing of their own can have it
supplied as an open-type component with terminals
instead of plug contacts.
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| Description |
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The in-line
amplifier module itself is operated at voltages between
15 V and 30 V, from which it generates a stable feed
voltage to supply the sensor with power. The measurement
signals of the sensor, normally ranging between 0 ... 5
mV and 0 ... 10 mV for bridge-connected strain gauges,
are amplified to analogue 0 ... 10 V.
The sensor characteristics are first roughly preset by
means of DIP switches, through an opening in the
housing. The finetuning of the instrument zero and
amplification settings is performed by means of a
multiple trimmer, accessible by screwdriver through
holes drilled in the side of the housing. The amplifier
connections are realized with sub-D plug and socket;
short circuit-proof sensor power feed and polarity
reversal protection for the amplifier power supply
afford additional safety for installation. If the
amplifier has to be secured to its environment, this is
done by clamping the housing or affixing it with an
adhesive. The open-type circuit board has mounting holes
for screw size M 2,5. The amplifier’s cut-off
frequency is > 1 kHz, its weight is < 65 g.
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