juenemann-instruments DR10 Betriebsanleitung Seite 3

These differential pressure gauges follow the EN 837-1
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.
The optimum selection of the scale range of the differential pressure gauge is given, if the oper-ating
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 and EN 837-1/2.
Sealing surfaces according to DIN 16258 are particularly suitable for sealing the pressure gauge. 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 and 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 isolating devices between pressure tapping point and differntial 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
vibration 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 facial in its vertical position. Positions other than vertical will be
indecated by a symbol on the dial.
No pressure higher than indicated by 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.
Differential
Measured value
X
Kl.1,6
Connectors
Sealing surface
X
Kl.1,6
Final value
limitation mark
Quality for the
future
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