EGE-Elektronik Spezial-Sensoren GmbH - Special-Sensors for Automation

Capacitive proximity switches - Terminology

Rated operating distance sn
The nominal operating distance is a device parameter that does not take into account sample variances and external influences such as temperature and supply voltages.

Effective operating distance sr
The real operating distance is the effective operating distance at nominal voltage and at nominal temperature of 23°C. It is between 90 % and 110 % of the nominal switching distance.

Usable operating distance su
The usable operating distance is in the entire allowable temperature and voltage range is between 80 % and 120 % of the real operating distance.

Assured operating distance sa
The assurred operating distance takes into account all the external influences and sample variances and is in the range from 0 % to 72 % of the service usable distance. Within this range a guaranteed switching is ensured.

Switch point drift
The operating distances 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 sensor. The hysteresis brings about a stable switching signal even when there are vibrations, temperature drift, or electrical failures. The hysteresis is defined according to EN60947-5-2 to be a maximum 20 % from the real operating distance, and carries a value of typically 10 % from the real operating distance sr for EGE sensors.

Repeating accuracy R
The repeating accuracy describes the maintenance of the switching point after the repeated approach of an object under specified circumstances. EGE sensors have typical tolerances of less than 3 % of the real operating distance.

Switching frequency
The maximum switching frequency of the sensor is determined at half nominal operating distance sn with standard measurement plates ST 37 according to EN 60947-5-2

Supply voltage
The operating voltage is the voltage range in which EGE 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
The current carrying capacity indicates the maximum continuous current for the switching output of the sensor at a given ambient temperature. The current carrying capacity is reduced with increasing ambient temperature and is meant for the use of a non inductive load.

Short circuit protection
The short circuit proof 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.

Overcurrent 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 in the semiconductor elements of the sensor. It is measured on the active output.

Residual current Ir
The residual current flows in the load current circuit when the output is blocked. The residual current must be considered when switching sensors in parallel.

Minimum load current Im
The minimum load current is necessary for flawless operation with two-wire devices.

Current consumption
The current consumption is the maximum value of the noload current Io that the sensor can absorb without a load.

Ambient temperature
The ambient temperature indicates the maximum allowable temperature range for the sensor.

Electromagnetic compatibility EMC
The EMC class is a measure of the noise immunity of the sensor against external electrical and magnetic influences. The information is based on the standard EN 61000-6-2.

Switch-on impulse suppression
EGE sensors have a switch-on impulse suppression that blocks the output during the switch-on phase, when the operational voltage is applied.

Protection
The protective system indicates the protection of the sensors against penetration of foreign bodies and water according to EN 60529.

LED-Display
EGE sensors with yellow light-emitting diodes indicate the switching status optically.

Housing material
The housing material determines the chemical resistance of the sensor against external influences. For special applications, other housing materials are available.

Connection
The connection of the sensors is accomplished through plug-in connections or cables. Different cable types and lengths are available upon request.

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