www.armano-messtechnik.com • p. 11 of 20 • GB • 09/22 • B1 •
B00-100
Operating Instructions Pressure Gauges
Selection Criteria, Measuring Arrangements, Installation and Operation Manual
For pressure gauges with pressure ranges of ≤ 6 bar
and pressure relief vent Ø 13 mm
(0.51")
at the top of
the case, it is recommended to cut off the nipple on
the filling plug in order to allow for internal pressure
compensation by venting the pressure gauge.
If the pressure gauge is positioned lower than the
pressure measuring port, the measuring line should
be rinsed thoroughly before putting into operation to
remove any foreign objects.
During pressure tests on pipes and vessels, no pres-
sure higher than indicated on the dial by the maximum
value mark must be applied to the pressure gauge
and the specified application limit at steady load must
not be exceeded (
chapter 8 “Intended Use”).
For diaphragm pressure gauges, the clamping bolts
for the upper and lower flange must not be loosened.
For instruments with attached chemical seal, the con-
nections between pressure gauge and chemical seal
and, if applicable, between chemical seal and capillary
line must not be loosened.
IMPORTANT! Before dismounting the
pressure gauge, the measuring unit has to
be depressurised.
If necessary, the measuring line needs to be
relieved. Medium residues in dismounted
pressure gauges might endanger person-
nel, facilities and the environment. Adequate
precautionary measures shall be taken.
8.
Intended Use
CAUTION! Shut-off devices shall only be
opened slowly in order to avoid sudden
pressure strokes during commissioning.
Application range:
On many pressure measuring instruments, the ap-
plication range for steady loads is indicated on the
dial by the maximum value mark (
DIN EN 837-1,
DIN EN 837-3).
At steady load, the Bourdon tube pressure gauges with
nominal case size 100, 160 and 250 are loadable up
to the full scale value. At dynamic load, only 0.9 times
of this pressure is permissible as peak load, for the
pressure ranges 0/2500 bar and 0/4000 bar max. 2/3 of
the full scale value. Bourdon tube pressure gauges are
overrange protected up to 1.3 times the full scale value
(0/2500 bar and 0/4000 bar instruments can only be
loaded up to their full scale value!).
At steady load, the Bourdon tube pressure gauges
with nominal case size 40, 50, 60, 63, 80 and 72x72 are
loadable up to 3/4 of the full scale value, at dynamic load
up to max. 2/3 of the full scale value and only temporar-
ily to the full scale value.
At steady load, diaphragm pressure gauges with verti-
cal diaphragm are loadable up to the full scale value, at
dynamic load up to 0.9 times the full scale value.
Diaphragm pressure gauges with horizontal dia-
phragm are overrange protected up to 5 times the full
scale value (custom-made instruments also higher),
but never higher than 40 bar.
At steady load, capsule gauges for low pressure are
loadable up to the full scale value, at dynamic load max-
imum up to 0.9 times the full scale value. Just as Bour-
don tube pressure gauges, they are 1.3-times overrange
protected (custom-made instruments also higher).
Zero point check:
In order to check the zero point of the pressure gauge
during operation, the shut-off device, required for this
purpose (
chapter 5 “Additional Accessory”), will
be shut and the pressure gauge will be relieved. The
pointer must be positioned within the zero range in-
dicated by .
If the pointer remains outside of this range, this gen-
erally results from a lasting deformation of the meas-
uring element, which needs to be submitted for a
closer examination in order to avoid accidents due to
measuring errors. In such a case, the device should be
replaced and, if required, returned to the manufacturer
for checking and repair.