Burkert 8137 Manuel D'instructions page 16

4 Mounting
Socket
16
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Fig. 8: Inflowing liquid
The socket piece should be dimensioned in such a way that the
antenna end protrudes at least 10 mm (0.4 in) out of the socket.
Fig. 9: Recommended socket mounting
If the reflective properties of the medium are good, you can mount
LEVEL TRANSMITTER 8137 on sockets which are higher than the
length of the antenna. You will find recommended values for socket
heights in the following illustration. The socket end should be smooth
and burr-free, if possible also rounded. After installation you must carry
out a false echo storage.
LEVEL TRANSMITTER 8137 • 4 ... 20 mA/HART