WIKA 910.27 - Manual (Page 6)

9045830 10/2006
6
Diaphragm Seal Measuring Systems
WIKA Operating Instructions Diaphragm Seals
D
Example 3 Example 4
Height (H1) max. 7 m or 4 m, respectively
Example 1 Example 2
Vacuum
Vacuum
■ To keep the influence of temperature low in case of diaphragm seal measuring systems with
differential pressure measuring instruments, fit or install plus and minus sides symmetric
with regards to ambient influences and ambient temperatures in particular.
7. Maintenance instructions
Under normal circumstances the diaphragm seal measuring system
requires no maintenance. Tests should be carried out on a regular basis
to guarantee the measuring accuracy of the pressure gauge. The tests or recalibrations have to
be carried out by qualified persons with the appropriate equipment.
For dismounting the measuring system must be in an unpressurised condition. Remainder of
the pressure medium contained in the pressure element may be hazardous or toxic. This
should be considered when handling and storing the removed pressure gauge.
In case of polluted, viscous or crystallizing pressure media, it may be necessary to clean the
diaphragm from time to time. Only remove deposits from the diaphragm with a soft brush and a
suitable solvent. Do not use aggressive cleaning agents.
Caution: do not damage the diaphragm with sharp edged tools.
!
When doing absolute pressure measurements (vacuum), the measuring instrument has to be
fitted at least on the same level as the diaphragm seal or below (see examples 3 and 4).
Vacuum: fit the measuring instrument below the
measuring point or on the same level in height (H1).