Chromatograph Series
User Manual
MRC Instrument
6
10.
The retention time
is prolonged and
the sensitivity is
low.
1)
The carrier gas flow rate is too slow.
2)
There is a change of the carrier gas flow
rate after the sample injection.
3)
The silica gel of the sampler leaks.
1)
Increase the flow rate of carrier gas. If
the carrier gas flow is blocked, fix it.
2)
Replace the sampling silica gel.
3)
Replace the sampler’s silica gel.
11.
Irregular wave of
the baseline
during the
isothermal
operation
1)
The instrument is placed in the right
position.
2)
The instrument is poorly grounded.
3)
The stationary liquid leaks.
4)
The carrier gas leaks.
5)
The detector is contaminated.
6)
The flow rate of the carrier gas is not
proper.
7)
The hydrogen flow and air flow are not
properly selected (FID).
8)
The amplifier is not stabilized.
1)
Place the instrument in a position with
no violent vibration and no strong air
convection. Keep the instrument
horizontal. It is recommended to place
the instrument on a cement platform
or the table covered with rubber.
2)
The instrument and the recorder
should be well grounded.
3)
Choose the proper stationary liquid and
process the column with thoroughly
aging treatment. The column
temperature should not be raised to
the operating limit of the stationary
liquid (especially the high sensitivity
