Reliable detection of the smallest errors during ongoing production
The GLSL hole detector from Fiessler Elektronik reliably detects even the smallest defects such as holes or tears in continuously running webs of metal, plastic, paper or wood. Thanks to its adjustable sensitivity, compact design and high scanning speed, it guarantees precise quality control directly in the production process. Defective materials are detected at an early stage and rejects are effectively avoided.
Typical areas of application:
Metal and plastic foils
Sheet metal strips
paper webs
Wood veneers
Function
Lochsuchgerät GLSL
The device consists of two components: a light transmitter and a light receiver. The transmitter emits an invisible, modulated infrared light band. The receiver consists of a series of receiver elements, the signal amplifier and the evaluation unit.
The sensitivity can be adjusted so that even the smallest holes (≥ 1 mm Ø) can be detected. When a hole is detected, the output transistors conduct or the relay picks up and the "Hole detected" LED lights up.
The hole size to be detected can be set to values from ≥ 1 mm to approx. ≤ 15 mm using the "Hole size" potentiometer. The adjustment range of the hole size decreases as the light transmission of the material used increases.
The maximum belt speed depends on the hole size to be detected. The sensitivity decreases as the belt speed increases. Belt speeds of up to approx. 30 m/s can be achieved.
Operating modes
Static:
Opaque materials The "static" operating mode is preferably used for opaque materials. The output switches when holes >= the set hole size occur. An evaluation also takes place when the material is at a standstill.
Translucent materials The use of translucent materials in the static operating mode requires a different sensitivity setting for each change in translucency in order to detect the same hole sizes.
dynamic material adjustment:
Translucent materials This operating mode is only suitable for translucent materials. The device automatically adjusts to translucent materials. This means that holes of the same size can be detected with different translucent materials (e.g. different types of paper) with the same hole size setting. The permeability of the material passing through is measured and stored. This value serves as a reference for the sensitivity setting.
It is important for this operating mode that the material to be examined is in motion. No evaluation takes place when the material is stationary!
Technical data
Connection voltages:
Transmitter 24 V AC (15 mA - 35 mA) Receiver 24 V DC (50 - 200 mA)
Light source:
Infrared, 36 kHz
Ambient temperature:
-10 °C to 50 °C
Outputs:
NPN/PNP max. 100 mA short-circuit-proof, response delay approx. 1 ms optional: relay, 1 x UM 5 A / 250 V, ind. free, 0.2 s drop-out delay, response delay approx. 10 ms
Protection class:
IP 65
The standard version is equipped with transistor outputs (PNP and NPN). A relay output is available on request. The response delay at the transistor outputs is approx. 1 ms. A drop-out delay of approx. 200 ms is built into the relay output.
Sliding sliding blocks and fixing lugs on the rear of the device allow flexible mounting. The housings are mounted plane-parallel at a distance of approx. 50-100 mm. Care must be taken to ensure that the housing tubes are not twisted.
The material strip to be examined should be approximately in the middle between the transmitter and receiver. The strip must cover the entire width of the light field. An overlap of approx. 15 mm must be observed. For narrower strips, the free parts of the receiver must be covered. The connection is made via 6-pin plug connections.
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