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Switch point drift
The
operating distance varies are given
for an ambient temperature of 23 C,
in the permissible temperature range
the operating distance varies by
less than 15% from the value at 23
C. The temperature of the measured
object has no influence on the
switch point.
Hysteresis H
The
switching hysteresis describes the
distance between the turn-on point
while approaching an object and the
turn-off point during the separation
of it from the sensors.
The
hysteresis brings about a stable
switching signal even when there are
vibrations, temperature drift, or
electrical vibrations. The
hysteresis is defined in EN
60947-5-2 as a maximum 20% from the
effective operating distance, and
carries a value of typically to
3...15% from the effective operating
distance sr. for Optimum sensors.
Repeating accuracy R
The
repeating accuracy describes the
maintenance of the switching point
after the repeated approach of an
object under specified circumstances.
Optimum sensors have typical
tolerances of less than 3% of the
effective operating distance.
Switching frequency
The
maximum switching frequency of the
sensor is determined at half rated
operating distance sn with standard
measurement plate to EN 60947-5-2
Operating voltage
The
operating voltage is the voltage
range within Optimum sensors
function safely. For a constant
voltage supply it is important to
make sure that the limits are still
observed when the residual ripple is
included.
Switching current
This
current gives the maximum long-term
current for the switching output of
the sensor at an ambient temperature
of 25 C and ohmic load. At an
elevated ambient temperature, the
current load capability decreases.
For
analog outputs, the boundary values
given in the appropriate technical
data, and particularly the
permissible values for resistance
loads, must be observed.
Short circuit
protection
The
short circuit protection ensures the
sensor against destruction through a
short circuit on the output. After
removal of the fault, the output is
reactivated. Where a maximum
overload current is listed, this
should not be exceeded
Excess-current
release
This value indicates
the median value of current at which
the short circuit protection
responds with a tolerance of +- 20%
Reverse polarity
protection
The reverse polarity
protection prevents destruction of
the sensor by a reversal of the
polarity of the voltage supply.
Voltage drop Ud
The voltage drop
arises at the internal resistance of
semi-conductor elements, which are
in the current path of the pot put.
it is dependent of the load-current
and is declared according to EN
60947-5-2 for mean current of 50 mA. |