61
Impulse pipe
Manual valve
Pressure source
Stop valve
%
3- Steam measurement
A drain pot must be mounted between transmitter and
pressure connect.
The impulse pipe connecting the drain pot to the transmitter
must be
fi
lled of water.
The installation of a purge is necessary.
Cautions on impulse piping
• For liquid, the impulse pipes should have an upward slope of 1/10 or more between the process
connection and the transmitter to prevent accumulation of gas, etc. in the detecting unit.
• For gas, the impulse pipes should have a downward slope of 1/10 or more between the process
connection and transmitter to prevent accumulation of moisture, etc. in the detecting unit.
• Avoid any sharp bends in impulse pipe which may cause gas or moisture to accumulate in the
impulse pipe.
• Do not not apply an excessive force to the transmitter during its connection.
• Install condensed chambers and vent drain when impulse pipes can't be inclined.
• The impulse pipes used should be suitable for the working temperature, pressure standards.
• During installation, avoid mechanical constrains of the transmitter connections.
• In case of exte rnal deg radation (corrosion, over
fl
ow, shock
,
etc) or in case
of
fi
re, the
concerned tr ansmitter must be checked before commissioning. To A void the deterioration of
the transmitter
mounted externally, it will be mounted in a box protection.
• The transmitter should never be exposed to
fi
re. In case of
fi
re, the transmitter characteristics
need to be c hecked before started up. The transmitter must not be reused if it has been
partially
or totally exposed to
fi
re and Heath.
•
Freeze protection.
When the measuring
fl
uid is likely to freeze in the cover of the measurement chamber, the
cover
needs to be warmed up with steam or a heater.
Don't exceed the previous temperature limits (measuring cell: 120°C maxi and transmitter:
85°C).
Even when the installations shut down the heat must be maintained, if not the transmitter and
impulse pipes must be drained to prevent freezing.
