Mounting and commissioning
30
Bourdon tube, capsule, diaphragm, spring diaphragm pressure gauges
7.8
Commissioning the product
Carefully commission the pressure measurement arrangement in or-
der to avoid pressure surges or sudden temperature changes.
Slowly open the shut-off units.
When subjecting pipe systems to pressure tests, never apply pres-
sure to pressure gauges in excess of the specified permissible val-
ues for static loads for the pressure gauge. If necessary, shut off the
pressure gauge or dismount it (see chapter 4.4, page 13).
In many cases, the range for static loads for a pressure gauge is in-
dicated by a maximum value mark (as per EN 837-1, chap-
ter 9.6.7/EN 837-3, chapter 9.6.6) on the dial. In the case of fluctuat-
ing loads, pressure gauges with maximum marks at the full scale end
may only be subjected to a pressure of 0.9 times the full scale value.
Pressure gauges with a maximum mark at 75 % of the full scale val-
ue or pressure gauges without a maximum mark may only be sub-
jected to a pressure of 2/3 of the full scale value in the case of fluc-
tuating loads.
a
Maximum value mark
Fig. 8: Maximum value mark
When cleaning or flushing the pressure line, you must not ex-
ceed the maximum permissible operating temperature of the
pressure gauge. If necessary, shut off the pressure gauge or
dismount it (see chapter 8.1, page 32).
