WIKA 851 - Manual (Page 14)

WIKA operating instructions magnetic snap-action contact model 821
GB
14
2003325.03 03/2011 GB/D/F/E
8. Commissioning, operation
With safety pressure gauges (see dial symbol k) ensure that the free
space behind the blow-out back is at least 15 mm.
8.2 Special requirements for the installation point
The instruments must be mounted in a location free from vibration in order to
avoid contact chatter and the resulting increased wear.
If the line to the measuring instrument is not adequately stable, a measuring
instrument holder should be used for fastening (and possibly via a flexible
capillary). If vibrations cannot be avoided by means of suitable instal-
lation, instruments with liquid filling should be used. The instruments
should be protected against coarse dirt and wide fluctuations in ambient
temperature.
8.3 Electrical connection
The electrical connection must only be made by qualified skilled
personnel. Connection details and switching functions are given on
the product label. Connection terminals and earth terminal are appro-
priately marked. The mains connection lines to be provided must be
dimensioned for maximum instrument power consumption and comply
with IEC 227 or IEC 245. Power ratings (see "Specifications") and
protective circuits with inductive and capacitive loads see chapter
"9. Contact protection measures".