Instruction Manual

WIKA Alexander Wiegand SE
& Co. KG
Alexander-Wiegand-Straße 30
63911 Klingenberg • Germany
Tel. [phone]
Fax [phone]
E-Mail [e-mail]
www.wika.de
11195411.03 11/2009
Spanner flats
Sealing face 
Sealing in
the thread

Notes in accordance with Pressure
Equipment Directive 97/23/EC
The pressure gauges are "pressure
accessories" in accordance with
article 1, paragraph 2.1.4
The volume of the pressure bearing
housings of WIKA pressure gauges
is < 0.1 L
The pressure gauges carry the
CE marking for fluid group 1G in
accordance with annex 2,
table 1 when their permissible
working pressure exceeds 200 bar
Pressure gauges that do not carry
the CE marking are manufactured
in accordance with article 3,
paragraph 3 "sound engineering
practice".
Applied standards
EN 837-1 Bourdon tube pressure
gauges, dimensions,
metrology, requirements
and testing
EN 837-2 Selection and installation
recommendations for
pressure gauges
EN 837-3 Diaphragm and capsule
pressure gauges, dimen-
sions, metrology, require-
ments and testing
Specifications:
see data sheet at www.wika.de
Subject to technical modifications.
© WIKA Alexander Wiegand SE & Co. KG 2009
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Operating
Instructions
GB
Pressure Gauges
Examples:
Model 131.11.063
Model 131.11.050
1. Safety instructions
WARNING!
Before installation,
commissioning and
operation, ensure that the
appropriate pressure gauge has been
selected in terms of measuring range,
design and suitable wetted material
(corrosion) for the specific measuring
conditions.
In order to guarantee the measur-
ing accuracy and long-term stability
specified, the corresponding load
limits are to be observed.
Only qualified persons authorised
by the plant manager are permitted
to install, maintain and service the
pressure gauges.
For hazardous media such as oxygen,
acetylene, flammable or toxic gases
or liquids, and refrigeration plants,
compressors, etc., in addition to all
standard regulations, the appropriate
existing codes or regulations must
also be followed.
After an external fire pressure media
can leak out particularly at soft solder
joints. All gauges have to be checked
and, if necessary, replaced before
recommissioning the plant.
Non-observance of the respective
regulations can result in serious injury
and/or damage to equipment.
2. Mechanical connection
In accordance with the general techni-
cal regulations for pressure gauges
(e.g. EN 837-2). When screw-fitting
the gauges the force required for
this must not be applied through the
case or terminal box but just through
the spanner flats (with suitable tool)
provided for this purpose.
Mounting with
spanner
Correct sealing of pressure gauge
connections with parallel thread 
shall be by means of a suitable
sealing ring, sealing washer or WIKA
profile seals. The sealing of tapered
threads (e.g. NPT threads) is made by
providing the thread  with additional
sealing material like, for example,
PTFE tape (EN 837-2).
The torque depends on the seal used.
Gauge connection by means of a
clamp socket or a union nut is recom-
mended to simplify correct orientation
of the gauge. When a blow-out device
is fitted to a pressure gauge, it shall be
protected against blocking by debris
and dirt.
With safety pressure gauges (see dial
symbol k) it has to be ensured that
the free space behind the blow-out
back will be at least 15 mm.
After mounting, set
the compensating
valve (if available)
from CLOSE to
OPEN.
Requirements on the installation
point
If the line to the gauge is not
adequately stable for a vibration-free
mounting, a measuring instrument
support (possibly via a flexible capil-
lary) should be used for fastening.
If vibrations cannot be avoided by
a suitable installation, liquid-filled
gauges should be used. The instru-
ments should be protected against
coarse dirt and wide fluctuations in
ambient temperature.
3. Admissible ambient and
operating temperatures
When mounting the pressure gauge
it has to be ensured that, taking the
influence of convection and heat
radiation into consideration, no upper
or lower deviation from the permissi-
ble ambient and medium temperatures
can occur. The influence of tempera-
ture on the indication accuracy is to
be observed.
4. Storage
The pressure gauge should remain in
its original packing until installation.
The gauge should be protected from
external damage during storage.
Storage temperature range:
-40 ... +70 °C.
Protect the gauges from humidity and
dust.
5. Maintenance / Repairs
The instruments are maintenance-
free. Tests should be carried out on a
regular basis to guarantee the measur-
ing accuracy of the pressure gauge.
The tests or recalibrations have to be
carried out by qualified skilled person-
nel with the appropriate equipment.
When dismounting, close the compen-
sating valve (if available).
WARNING!
Residual media in
dismounted pressure
gauges can result in a risk
to persons, the environ-
ment and equipment. Take
sufficient precautionary
measures.