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4.10 Flow controller (SPL, WBI only)
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4.10.1 Maintenance intervals
Replace 2 traps (PURGE and SPLIT) periodically. The interval is usually 6 months. However, if you often analyze
high boiling point samples, or samples which are solid at room temperature, you need to replace more frequently.
Also, inspection/maintenance is required in the following cases.
• Baseline is unstable or there is significant noise
These occur when molecular sieve filter is saturated. Replace the molecular sieve filter, or condition it.
• Usually, the replacement interval for traps is 6 months. However, if you find the traps are clogged, replace
them even sooner. The following describes how you know the traps are clogged.
4.10.2 Maintenance procedures
Trap inspection
This section describes trap inspection procedures. This explanation assumes that you are using capillary column.
For the case of using a wide bore column, refer to the explanation in parenthesis below.
(1)
Specify purge flow rate at 0.
(2)
Leave the column as it is. (In case of wide bore
column, remove only injection port end, and
cover the mounting port with a sealing plug.)
(3)
Specify the split mode to "SPLIT".
(4)
Specify 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)
Refer to P. 66 [Setting for analysis].
(5)
In this status, monitor the column inlet pressure. If
the measured value is 50 kPa or higher, replace
the trap (SPLIT).
(6)
When replacing the trap (SPLIT), also replace the
trap (PURGE) at the same time.
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