Shimadzu PDA-7000, Instruction Manual

Page: 54 / 108

4 Operation
4-4
4.2 Checking gas flow rate
(1) When the instrument is in operation
Confirm that argon gas is flowing at the following rate: 10L / min during analysis
(discharge) and 1L / min during the standby, by a flow meter.
To adjust the flow rate during analysis, use screens such as Manual Scanning , on
which continuous discharge can be made.
Argon Gas Flow Meter
Note
● Read the gas flow rate at the center of the ball.
● When the argon gas supply pressure, which is set to 140kPa to
200kPa (1.4kg / cm
2
to 2.0kg / cm
2
), changes, the argon gas flow rate
changes accordingly. In this case, set the flow rate to an appropriate
value again.
● Check the argon gas flow rate on daily basis. If the residual
pressure of argon gas cylinder lowers, the argon gas flow rate
changes accordingly, and may cause analytical value fluctuations.
Gas flow control dial
During analysis
Gas flow control dial during
standby
(Bypass valve)
Flow rate during analysis
10L / min
Flow rate during standby
1L / min.
Gas flow control dial
When the instrument is not
used or at nighttime