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WIKA operating instructions gas density monitor model GDM-63
EN
14502554.01 07/2021 EN/DE
5. Commissioning, operation
5.1 Mechanical mounting
CAUTION!
Physical injuries and damage to property and the environment
through faulty instrument
Prior to commissioning, the instrument must be subjected to a visual
inspection. Only use the instrument if it is in perfect condition with respect
to safety.
5.1.1 Requirements for the installation point
■
For outdoor applications, the selected installation location has to be suitable for the
specified ingress protection, so that the instrument is not exposed to impermissible
weather conditions.
■
The sealing faces at the instrument and at the measuring location have to be
undamaged and clean.
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.
5.1.2 Installation
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With transport or storage, it can occur that gas density monitors warm up or cool down
and this results in pointer movements. These pointer movements are caused by the
compensation system. To make sure that the instruments have adapted sufficiently to
ambient temperature, at least 2 hours at 20 °C [68 °F] must be allowed for adaptation
to the temperature. Then, in the depressurised state, the pointer will sit within the
tolerance bar.
■
Corresponding to the general technical rules for pressure gauges (e.g. EN 837-2
“Selection and installation recommendations for pressure gauges”) when screwing in
the instrument, the force required to do this must not be applied through the case, but
only through the spanner flats provided for this purpose and using a suitable tool.
■
When screwing in, do not tilt the threads.
For parallel threads, use flat gaskets, lens-type sealing rings or WIKA profile sealings
at the sealing face
. With tapered threads (e.g. NPT threads), sealing is made in the
threads
, using a suitable sealing material (EN 837-2).
The tightening torque depends on the sealing used. In order to orientate the measuring
instrument so that it can be read as well as possible, a connection with LH-RH adjusting
nut or union nut should be used. When a blow-out device is fitted to an instrument, it
must be protected against being blocked by debris and dirt.
Sealing in the thread
Spanner flats
Sealing face
4. Transport, packaging ... / 5. Commissioning, operation
