MANFRED JÜNEMANN DM10 Instructions D'utilisation page 3

These differential pressure gauges follow the EN 837.3
The user must ensure that the appropirate differential pressure gauge with regard to the medium effect on the
used material/measuring system, scale range and version is selected.
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.
Zero point marking
The tapping points should be prepared according to the indications for tapped holes. Further information you
will find on the VDE/VDI directive 3511 and 3512 page 3 of and EN 837-1/2.
Sealing must correspond to DIN 16258. The correct torque depends on material and shape of the sealing
washer. It should not exceed 80 Nm.
The higher pressure is connected to the + connector an the lower one to the - connector.
For tightening and removal of the pressure gauge, the connectors are adapted to the measuring point by
means of a loose union nut or right/left screwing.
Differential pressure gauges without glycerin/oil filling should be installed such as to avoid exposure to vibration
and to allow easy observation of the dial indication.
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 indication
accuracy must be considered.
If the tail pipe is not sufficiently rigid to accept the weight of the differential pressure gauge, particularly
where vibrations exists, the gauge should be mounted by means of a mounting device for surface or pipe
mounting, if necessary with capillary extension.
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 syphons with 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 screws (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 25 bar must be applied to the differential pressure gauge during hydrostatic pres-
sure 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 orignal packing.
Storage temperature -40 to +70°C.
Notice:
For pressure gauges with electric alarm contact, see instructions manual:
Electric alarm contact; Typ: S/M Art.-Nr.: 413081
Typ: E Art.-Nr.: 413082
Typ: I Art.-Nr.: 413083
Typ: P Art.-Nr.: 413084
X
Zero point adjustment
Connectors
Sealing surface
X
Final value
limitation mark
Quality for the
future
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