1 kgf/cm
2
= 0.098 MPa = 0.98 bar = 14.2 psi
n Setting the compressibility of solvent《COMP》
Although the instrument corrects the
compressibility to suppress pulse increase
caused by the effect of the compressibility
of the solvent, setting a compressibility
suitable for the solvent used enables more
accurate correction.
Input the compressibility (GPa)
-1
with the
numeric keypad and press [Enter]. The
initial value is 0.45.
Single solvent
Set the compressibility according to the table.
Mixture of water and organic solvent
If the concentration of the organic solvent is 50 % or less, "0.45" is recommended for
the compressibility of water. If the concentration is more than 50 %, make the value
closer to the compressibility of organic solvent according to the mixture ratio.
Example) When the ratio between water and acetonitrile is 50 : 50, set "0.45".
When the ratio between water and acetonitrile is 30 : 70, set "0.75".
In other cases or when rigorous adjustment is required
1
Connect a resistance tube (or column) that can create pressure similar to the
desired delivery pressure at 1.0 mL/min or less and wait until delivery becomes
stable.
Mobile Phase
compressibility (GPa)
-1
Water 0.45
Acetonitrile 1.20
Methanol 1.25
Ethanol 1.20
2-propanol 1.20
Hexane 1.60
Heptane 1.25
Cyclohexane 1.25
Ethyl Acetate 1.10
Chloroform 1.10
Benzene 1.00
32
LC-40D X3 CL LC-40D XR CL
3 Operation
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