KROHNE OPTISWITCH 6500 C EN - Manual (Page 12)

3
INSTALLATION
12
OPTISWITCH 6500 C
www.krohne.com 01/2014 - 4000649104 - MA OPTISWITCH 6500 R04 en
3.4 Mounting of 3A marked products
The 3A mark is valid only when the product is mounted in a 3A marked counterpart and installed
acc. to the installation manual. Use also a 3A marked O-ring or gasket if relevant.
The 3A marked products conforms to the 3A sanitary standards criteria. Materials and surfaces
fulfill the FDA demands.
EPDM O-rings supplied with 3A marked products are conform to sanitary standards class II (8%
milk fat).
1 Use only 3A approved counterparts.
2 The inspection hole should be visible and drained. Face it downwards that leaking can be
observed.
3 Mount the device in a self-drained position.
4 Level the inner surface of the pipe with the counterpart.
5 Weld from the inside of the tank, if possible. Welds shall be free from cracks, crevices and
grooves. Weldings should be grinded to R
a
= 0.8 µm.
Figure 3-1: Mounting of 3A products in pipe installations (A) or tank installations (B)