WIKA PGT43.100 - Manual (Page 11)

GB
4. Installation instructions
11
97
64 05/
009 GB/D/F/E
WIKA Operating Instructions intelliGAUGE family 11
Mounting provisions
If the line for the pressure gauge is not rigid enough for vibration-free installa-
tion, fasten the instrument using appropriate fastening elements for wall and/or
pipe mounting, and, if necessary, by means of a capillary line.
Measuring system damping
If it is not possible to avoid vibration by means of appropriate mounting, use
pressure gauges with liquid filling.
Effects of temperature
The operating temperature of the pressure instrument, resulting from the effects
of radiated heat, must not exceed the temperature range the pressure instru-
ment is intended for. Suitably-shaped tailpipes or syphons with water filling may
be used to separate the pressure transmitter and its isolating device from hot
pressure media.
The effective maximum surface temperature is not dependant
upon the device, but mainly on the temperature of the respec-
tive pressure medium! In the case of gaseous substances, the
temperature may increase due to compression warming. In
these cases it may be necessary to throttle the rate of change
of pressure or reduce the permissible temperature of the
pressure medium.
Diaphragm seal/separating foil
In the case of aggressive, hot, highly viscous, contaminated or crystallising
pressure media, which must not be allowed to enter the measuring element,
diaphragm seals must be used as a separating barrier. A neutral transmis-
sion fluid, used to transmit the pressure to the measuring element, should be
selected with consideration to the measuring range, the temperature and its
compatibility with the pressure media.
Under no circumstances must the connection between the pressure gauge and
the diaphragm seal be loosened.
Protection of the measuring element against overload
If the pressure media is subject to rapid pressure changes, or pressure impuls-
es may be expected, these must not act directly on the measuring element. The
effect of the pressure impulses must be damped, e.g. by installing an integrated
restrictor screw (reduction of the cross-section in the pressure channel) or by
connecting an adjustable throttle device in series.