59
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 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 external degradation (corrosion, over
fl
ow, shock ... etc) or in case of
fi
re, the concerned
transmitter must be checked before commissioning. To avoid 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 checked 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
