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EGE URA Series Opto Sensor Capacity Amplifier

The Opto Edge controller consists of an amplifier to which two fibre-optic cables of up to 10 m in length can be connected via a rapid action coupling. The first fibre-optic cable routes a send signal generated by the amplifier to a first optical converter, while the second fibre-optic cable returns a send signal detected by a second optical converter to the amplifier as a receiving signal.

System Description

The Opto Edge controller consists of an amplifier to which two fibre-optic cables of up to 10 m in length can be connected via a rapid action coupling. The first fibre-optic cable routes a send signal generated by the amplifier to a first optical converter, while the second fibre-optic cable returns a send signal detected by a second optical converter to the amplifier as a receiving signal. This receiving signal is processed further in the amplifier into an output control signal.

The Opto Edge controller works with infra-red light which issues extremely short and fast impulse sequences which enable reliable recording of rapidly occurring processes, even in the presence of influences from external rays.The process control system which is determined by the user, as well as the design of the optical converter, demands a high degree of flexibility from the system.

Structure of the opto edge controller

In the system structure illustrated on Fig.1 (please check the catalogue) the optical converters (3, 4) are configured in opposing positions to form a photoelectric barrier. The material which, for example, may be paper or a metal edge, pushes into the light ray and, depending on the depth of insertion, reduces the ray path of the light flow detected by the converter. The amplifier which is connected by means of the fibre-optic cable supplies a control signal (4…20 mA) to its output which is proportional to the insertion depth of the material depending on the formation of the optical converters (3,4) with a repeating accuracy of up to +/- 0.5 mm.

Opportunities for adjustment are provided on the amplifier which ensure the exact adaptation of the fibre-optic cable types, optical converters or output signals, such as to discriminate digital switching or analog recording. A particular advantage of the system is that the fibre-optic cable and the optical converter for transmitting and receiving are identical and, thereby, interchangeable. As a result, modification of the recording arrangement is reduced to purely construction measures. The photoelectric barrier process can be changed to a reflex process by a simple modification. In the reflex process illustrated in Fig. 3 (please check the catalogue) the optical converters for the send and receive signals are arranged next to each other, e.g. above the material. With this arrangement the material does not interrupt the ray path between the sender and the receiver, but rather reflects a residual ray flow, which is detected by the receiver. The output corresponds to the distance of the materials. In this arrangement the result is also a current signal from the amplifier which is proportional to the insertion depth of the material with high repeating accuracy.
In the case of the reflex process, however, accompanying conditions which are included in the measurement result have to be taken into account. In particular these include the reflection factor of the material (5) or the reflection due to the background (6) which is not covered by the material. Influences of this type have to be taken into account during installation.

Recording of cracks, impact or non-homogeneity

Cracks or non-homogeneity in the area of the edges are principally recognised by the processes described in Fig. 1 or Fig. 3. In accordance with Fig. 1, cracks or non-homogeneity are recognized as short flashes of light while passing through, whereas in accordance with Fig. 3 depending on the background the reflection is briefly altered. Recognition of cracks or irregularities in the material characteristics, e.g. also holes, is detpendent on high speed reception on the part of the recording system. If, for example, in accordance with Fig. 1 a crack approx. 2 mm wide moves past the optical converter at a belt speed of 10 m/s the duration of the flash amounts to 0.0002 s. In this case, the optical amplifier has to have a resolution of at least 5 kHz. Similar conditions exist if, for example, border recognition with an accuracy of only a few millimeters has to be carried out for rapid pipe throughput in a section reduction rolling mill.

Features

  • Analog high-capacity amplifier
  • 10 kHz detection frequency
  • LCD display
  • Universal high-capacity amplifier
  • 4…20 mA output
  • 0…10 V Outputs
  • Relay output
  • PNP output
  • Discriminator

Applications

High capacity amplifier URA 408

This amplifier is intended for connection to a 24 V direct voltage power supply and has a 4….20 mA current output. The instantaneous current is displayed on a LCD display. The zero point (4 mA) and amplification can be adjusted independently enabling the characteristic curve to be shifted in parallel, as well as adjusting the slope. In order to span larger distances between photoelectric barriers or larger intervals between reflex scanning the send capacity can be switched to “long”. These characteristics enable
adaptation to a wide variety of opto-converters, fibre-optic cables or application requirements. The ultrared light generated by the amplifier has a high pulse rate of 50 kHz which enables reliable recording of rapid processes in the range of 8 – 10 kHz. In addition to this high input resolution the amplifier also has a high EMC tolerance which excludes the possibility of disruptive pulses being confused with event pulses.

Universal high capacity amplifier URA 5001

In addition to the basic characteristics which have been described for the URA 408 amplifier, this device has additional characteristics which make it universally deployable. It is also equipped for alternating current power supplies, has an additional 0…10 V Voltage output, as well as two PNP switch outputs. Upper and lower thresholds can be set for the entire characteristic curve range by means of a precision potentiometer. If the upper threshold is exceeded or the lower threshold not achieved the respective switch output closed and the corresponding LED is activated. If no threshold is affected the signal value is within specified limits. This is displayed by a third LED. This discrimination technology allows direct control or monitoring, e.g. that a belt is operating correctly, with pre-set permissible tolerances. For applications which require higher currents for switched mode operation or require a system control center which is without voltage the PNP outputs are switched to internally installed relays.

Specifications

Design URA 408 GI
Sensitivity adjustable
Output 4-20mA
ID-No. P51022
Type URA 408 GI
Supply voltage [V] 24 DC ±10%
Current consumption [mA] < 120
Current output [mA] 4…20
Load resistance RL [Ω] 200…500
Detection frequency [kHz] 10
Accuracy [mA] ±1
Ambient temperature [°C] – 20…+60
EMC-class A
Protection [EN60529] IP 65
Display LCD
Housing material aluminium
Connection fibre-optic cable rapid action coupling | M12 connector

 

Design URA 5001
ID-No. P50029
Type URA 5001
Supply voltage [V] 24 DC / 230 AC ±10%
Current consumption [mA] 70 DC / 20 AC
Ambient temperature [°C] – 20…+70
EMC-class A
Protection [EN60529] IP 65
Display LCD
Housing material aluminium
Output 4…20 mA 0…10 V PNP Relay
Switching current [mA] 200 400
Detection frequency [kHz] 8 8 6 0.01
Accuracy [%] 3 3 5 5
Load resistance RL [Ω] 200…500 500…5000
Connection terminal screws

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EGE Opto Sensors

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