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Instructions for Operating
optoNCDT 2300
10.5 Protective Housing
The protective housing are designed to be used especially if the sensor operates in diffuse reflection mode and in a dirty environment
or higher ambient temperature. It is available as an accessory. If these protective housings are used, the linearity of the sensors in the
complete system may deteriorate. For the sole purpose of protection against mechanical damage a simple protective shield with suf-
ficiently large opening is therefore more advantageous. Installation of the sensors in the protective housings should be performed by
the manufacturer, because especially in case of short reference distances the protective window must be included in the calibration.
10.5.1 Versions
- SGH size S, M: without air purging (with inlet and exhaust for cooling) and
- SGHF size S, M: with air purging.
10.5.2 Guidelines
- The maximum ambient temperature within the protective housing is 45 °C.
- The requirements for compressed-air are:
Temperature at the inlet < 25 °C
The compressed-air must be free of oil and water residues. It is recommended to use two oil separators in series arrangement.
- With a flow rate for example 240 l/min (2.5E+5 Pa or 36.2 psi) the maximum outside temperature is 65 °C.
- For higher ambient temperatures it is recommended to use an additional water-cooled carrier and cover plates outside the protec-
tive housing.
- No direct heat radiation (including sunlight!) on the protective housing. In case of direct heat radiation additional thermal protective
shields must be installed.
- It is recommended that the protective window is cleaned from time to time with a soft alcohol-soaked cloth or cotton pad.
10.5.3 Delivery
The rotatable plug-nipple glands type LCKN-1/8-PK-6 (FESTO) for the compressed-air tubes with a inner diameter of 6 mm, the air
plate (SGHF) and the sensor fastening accessories are included in the delivery of the protective housing.
i
The protection class is limited to water (no penetrating liquids or similar).
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