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Appendix
optoNCDT 22xx
14.2
Protective Housing
The SGH protective housing are designed to be used especially if the sensor operates in a dirty environment
or higher ambient temperature. It is available as an accessory. If these protective housings are used, the lin-
earity of the sensors in the complete system may deteriorate. For the sole purpose of protection against me-
chanical damage a simple protective shield with sufficiently large opening is therefore more advantageous.
The protective housing are offered in two versions:
SGH
without air purging (with inlet and exhaust for cooling) and
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SGHF with air purging.
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The following guidelines must be observed if the sensors are operated in a protective housing:
1. The maximum ambient temperature within the protective housing is 45 °C.
2. 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.
3. With a flow rate for example 240 l/min (2.5 bar) the maximum outside temperature is 65 °C.
4. For higher ambient temperatures it is recommended to use an additional water-cooled carrier and cover
plates outside the protective housing.
5. No direct heat radiation (including sunlight!) on the protective housing. In case of direct heat radiation
additional thermal protective shields must be installed.
6. 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.
7. It is recommended that the protective window is cleaned from time to time with a soft alcohol-soaked
cloth or cotton pad.
The delivery includes:
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.
The delivery includes no screws for fastening the protective housing (for example 4 pieces M4 x 20).
