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This differential pressure gauge follow the EN 837.3 .
The user must ensure that the appropriate differential pressure gauge with regard to the medium effect on the
used material/measuring system, scale range and version is selected.
Only dust free and dry gases must be used as medium.
The optimum selection of the scale range of the differential pressure gauge is given, if the operating pressure
is in the midscale of the scale range.
The overpressure safety is provided by means of the + connector in the measuring system.
Zero point marking
The connections are equipped for hoses with an outer diameter of 6 mm.
The higher pressure is connected to the + connector and the lower one to the - connector.
We recommend the installation of isolation devices between pressure tapping point and differential pressure
gauge facilitating replacement of the pressure gauge or a zero point control while the system is pressurised.
Correct zeroing may be checked by closing the isolating device and relieving the gauge from pressure.
The pointer must fall within the thickened portion of the zero mark. The influence of temperature on the indi-
cation accuracy must be considered.
The differential pressure gauge should be installed such as to avoid that the admissible ambient temperature
(ambient and medium) and possibly convection and heat radiation will not exceed the temperature span the
differential pressure gauge is intended for. Suitably shaped tail pipes or syphonswith water filling may be used
to seperate the gauge and its device from hot pressure media.
Should the measuring media be subject to rapid fluctuations in pressure, or pressure surges have to be taken
into account, these must not be allowed to act on the pressure element. The pressure surges must be restricted
in their effect, for example by filling integral restrictor screw (to reduce the cross-section in the canal) or by
using an adjustable snubber device.
Normal gauge position will have the dial facia in its vertical position. Positions other than vertical will
be indicated by a symbol on the dial.
No pressure higher than indicated by the working pressure symbol (final value) on the dial must be applied
to the differential pressure gauge during hydrostatic pressure test of the system. Otherwise the differential
pressure gauge must be isolated or removed during this operation.
Before removing the differential pressure gauge, the measuring element must be depressurised.
To avoid damages the differential pressure gauge is stored in its original packing.
Storage temperature -40 to +70°C.
X
Zero point Adjustment
Tube connection
+
-
Ø 6mm
X
Final value
limitation mark
Quality for the
future
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