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14
4 Mounting
VEGABAR 28 • Three-wire 1 x transistor or 4 … 20 mA
57534-EN-220826
4 Mounting
4.1 General instructions
The instrument is suitable for standard and extended ambient condi-
tions acc. to DIN/EN/IEC/ANSI/ISA/UL/CSA 61010-1. It can be used
indoors as well as outdoors.
Note:
For safety reasons, the instrument must only be operated within the
permissible process conditions. You can find detailed information on
the process conditions in chapter "
Technical data
" of the operating
instructions or on the type label.
Hence make sure before mounting that all parts of the instrument ex-
posed to the process are suitable for the existing process conditions.
These are mainly:
•
Active measuring component
•
Process fitting
•
Process seal
Process conditions in particular are:
•
Process pressure
•
Process temperature
•
Chemical properties of the medium
•
Abrasion and mechanical influences
The permissible process pressure range is specified by "MWP" (Maxi-
mum Working Pressure) on the type label, see chapter "
Structure
".
The MWP takes the element of the measuring cell and processing
fitting combination with the weakest pressure into consideration and
may applied permanently. The specification refers to a reference
temperature of +20 °C (+68 °F). It also applies when a measuring cell
with a higher measuring range than the permissible pressure range of
the process fitting is installed order-related.
In addition, a temperature derating of the process fitting, e. g. with
flanges, can limit the permissible process pressure range according
to the respective standard.
Note:
In order to prevent damage to the device, a test pressure may only
exceed the specified MWP briefly by 1.5 times at reference tempera-
ture. The pressure stage of the process fitting as well as the overload
resistance of the measuring cell are taken into consideration here
(see chapter "
Technical Data
").
Protect your instrument against moisture ingress through the following
measures:
•
Use a suitable connection cable (see chapter "
Connecting to
power supply
")
•
Tighten the cable gland or plug connector
Ambient conditions
Process conditions
Permissible process
pressure (MWP) - Device
Protection against mois-
ture