Shimadzu PDA-7000, Instruction Manual

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5 Maintenance
5-34
9 Store all the old recalibration samples that can be no longer used.
Do not discard them.
10 Save data of analytical values and screen copies obtained through recalibration
sample replacement by the procedure above.
5.13 Replacing argon gas cylinder
If air enters the piping during argon gas replacement, the argon gas purity in the
piping lowers due to contamination. In this condition, it takes longer for analytical
values to stabilize. Use the procedure described below to replace the argon gas.
(For numbers (1) through (3) in the procedure, see the reference piping diagram on
the next page.)
1 Close the main valve (2) on the piping of cylinder No.1 to be replaced.
2 Replace cylinder No.1 with a new one and open the valve of the pressure
regulator (1).
3 Open and close the purge valve (3) two or three times to release contaminated
gas from the piping.
4 Open the main valve (2).
Note
● When nitrogen is contained in the element to be analyzed, pay extra
attention while changing argon gas.
● When changing a gas cylinder, use care not to allow dust or debris
to enter the piping.
5.14 Periodic inspection
To use the instrument safely and correctly, the periodic inspection is needed.
For the details of the periodic inspection, contact your Shimadzu service representative.
5.15 Cleaning the temperature control fan heater
The temperature control fan heater needs cleaning depending on the conditions of the
use. Ask a Shimadzu service engineer to clean it at least once a year.