Page 97
Instruction for Operating
optoNCDT 1700
9.4 Protective Housing
The 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 linearity
of the sensors in the complete system may deteriorate. For the sole purpose of protection against mechanical
damage a simple protective shield with sufficiently 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.
The following guidelines must be observed if the sensors are operated in a protective housing:
- 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 (2.5 * 10
5
Pa) 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 protective housing.
- No direct heat radiation (including sunlight!) on the protective housing. In case of direct heat radiation ad-
ditional 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.
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.
Model types:
- SGH size S
SGH size M:
without air purg-
ing (with inlet and
exhaust for cool-
ing) and
- SGHF size S
SGHF size M:
with air purging.
IMPORTANT!
The protection class
is limited to water (no
penetrating liquids or
similar)!
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