18 Maintenance and Inspection
18.8 Inspection and Maintenance: Flow Controller
302
GC-2010 Plus
18.8.1 Inspection/maintenance cycle
Replace the purge and split vent traps periodically. The guideline for replacement is usually
6 months. However, when analyzing many samples whith high boiling point compounds, or
compounds which are solid at room temperature, you should replace the traps more fre-
quently.
And in the following cases, you should inspect and maintain the filter and the traps.
・ When the baseline is unstable or there is significant noise.
These problems often occur when the molecular sieve filter is saturated. Replace or
regenerate it.
・ The replacement cycle of each trap is 6 months. However, if the traps is clogged, replace
it. The following section describes how to decide that a trap is clogged.
18.8.2 Inspection/maintenance
Q Trap inspection
The procedure below describes how to inspect the trap when capillary column is used. (The
procedure for wide bore columns is described in parentheses.)
Internal diameter
Capillary column: ≦ 0.32 mm
Wide bore column: ≧ 0.45 mm
(1) Set the purge flow rate to “0”. For the procedure, refer to “12.5.8 Septum purge”.
(2) Leave the column installed. (For wide bore columns, disconnect the column at the
injection port only, and attach a column nut and a graphite ferrule with a wire to the
injection port.)
(3) Set the Split mode to “SPL”.
(4) Set the column inlet pressure and the total flow rate to the following values.
Column inlet pressure (PRSS) = 0 (kPa)
Total flow rate (FLOW) = 400 (mL/min)
For details, refer to “8 Setting the Analytical Parameters and File Management”.
(5) Monitor the column inlet pressure. If the measured value is 50 kPa or more, replace the
trap (SPLIT).
(6) When replacing the split vent trap, replace the purge vent trap also.
Q Trap replacement
Perform the following procedure to replace the trap.
(1) Stop the carrier gas flow.
(2) Remove the panel from the INJ/DET unit.
(3) To prevent confusion, replace one trap at a time.
(4) Disconnect the blank nuts from a new trap.
These blank nuts are sealed the trap.
(5) Install the new trap.
The tubing codes indicate they should be used to filter the following flow lines.
S ... Split flow line
P ... Septum purge flow line
C ... Carrier gas inlet flow line
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