WIKA NG 63 Betriebsanleitung Seite 21

5. Commissioning, operation
For information on the ingress protection, see Technical information
IN 00.18
EN
Protection of the pressure elements from overload
If the medium is subject to rapid changes in pressure, or pressure
surges are expected, then these must not act directly on the
pressure element. The action of the pressure surges must be
dampened, for example with the fitting of a throttle section
(reduction in cross-section in the pressure channel) or through the
addition of an adjustable throttling device.
Pressure tapping point
The pressure tapping point should be arranged with as large
a bore as possible (≥ 6 mm) via a shut-off device, so that the
pressure tap is not distorted by a flow in the medium. The measur-
ing line between the pressure tapping points and the instrument
should have a large enough internal diameter to prevent blockage
and lag in the pressure transmission.
Measuring line
The measuring lines must be as short as possible and should be
arranged without sharp radii in order to avoid any disruptive time
lags. When routing these lines, a steady inclination of approx. 1:15
is recommended.
The measuring line should be designed and installed so that
the loads occurring due to expansion, vibration and thermal
effects can be absorbed. With gaseous media, a drain should be
provided at the lowest point; with liquid media, a vent should be
provided at the highest point.
The measuring instruments must be mounted in the common
mounting position per EN 837-1, with a max. permissible incline
of 5° on all sides.
Pressure gauge with reed contact model 851-A, for Ex areas 21