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Installation, 9 venting – KROHNE OPTIBAR PC 5060 C EN User Manual

Page 21

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INSTALLATION

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OPTIBAR PC 5060 C

www.krohne.com

04/2014 - 4003437201 - MA OPTIBAR PC 5060 C R01 en

3.9 Venting

The ventilation for the electronics housing is assured via a filter element in the vicinity of the
cable glands, which is permeable to air but water-absorbent.

The following devices feature a dummy plug instead of a filter element:

• Devices in the IP 66 / IP 68 (1bar) protection category - venting via capillary tube in

permanently connected cable

• Devices with absolute pressure

CAUTION!
The filter element causes a delayed pressure equalisation when the housing cover is opened or
closed quickly. During the process the measurement can change by up to 15 mbar for up to 5
seconds.

CAUTION!
In order to ensure effective ventilation, the filter element must be always free of deposits.

CAUTION!
Do not use a high-pressure cleaner to clean the housing. The filter element may become
damaged and as a result moisture can penetrate into the housing. The exception to this is the
IP69K single chamber housing.

Figure 3-3: Venting in non-Ex, Ex ia and Ex d ia versions

1 Single chamber housing, plastic, stainless steel precision casting
2 Single chamber housing, aluminium
3 Single chamber housing, electro-polished stainless steel
4 Double chamber housing, plastic
5 Double chamber housing, aluminium
6 Filter element

.book Page 21 Friday, May 2, 2014 12:49 PM