<7. Operation>
7-6
IM 01C25K01-01E
7.6 Venting or Draining
Transmitter Pressure-
detector Section
Since this transmitter is designed to be self-
draining and self-venting with vertical impulse
piping connections, neither draining nor venting
will be required if the impulse piping is configured
appropriately for self-draining or self-venting
operation.
If condensate (or gas) collects in the transmitter
pressure-detector section, the measured pressure
may be in error. If it is not possible to configure the
piping for self-draining (or self-venting) operation,
you will need to loosen the drain (vent) screw on the
transmitter to completely drain (vent) any stagnated
liquid (gas).
However, since draining condensate or bleeding off
gas gives the pressure measurement disturbance,
this should not be done when the loop is in
operation.
WARNING
Since the accumulated liquid (or gas) may be
toxic or otherwise harmful, take appropriate care
to avoid contact with the body, or inhalation of
vapors.
7.6.1 Draining Condensate
1) Gradually open the drain screw or drain plug
and drain the transmitter pressure-detector
section. (See Figure 7.6.1.)
2) When all accumulated liquid is completely
removed, close the drain screw or drain plug.
3) Tighten the drain screw to a torque of 10 N·m
{1kgf·m}, and the drain plug to a torque of 34 to
39 N·m {3.5 to 4 kgf·m}.
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Drain screw
Drain plug
When you loosen the drain screw or drain
plug, the accumulated loquid will be
expelled in the direction on th earrow.
Figure 7.6.1 Draining the Transmitter
7.6.2 Venting Gas
1) Gradually open the vent screw to vent gas from
the transmitter pressure-detector section. (See
Figure 7.6.2.)
2) When the transmitter is completely vented,
close the vent screw.
3) Tighten the vent screw to a torque of 10 N·m
{1kgf·m}.
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Vent screw
Vent screw
When you loosen the vent screw, the gas
escapes in the direction of the arrow.
Figure 7.6.2 Venting the Transmitter
7.7 Local Parameter Setting
WARNING
The local push button on the integral indicator
must not be used in a hazardous area. When it is
necessary to use the push button, operate it in a
non- hazardous location.
IMPORTANT
• Do not turn off the power to the transmitter
immediately after performing parameter
setting. Powering off within 30 seconds of
performing this procedure will return the
parameter to its previous setting.
• The parameter of Ext SW must be“Enabled”
to perform this configuration. See the user’s
manual IM 01C25T (HART/BRAIN) for the
setting procedure.
• The Local Parameter Setting function
is available with HART or BRAIN
communication type.
LCD update will be slower at low ambient
temperature, and it is recommended to use
LPS function at temperatures above -10
degrees C.
