22
Flow rate calibration without back pressure completed
Setting a temporary flow rate compensation value
FLOW COMP = Value obtained in flow rate calibration Step 1
PRESS COMP = 4.7, a temporary value
Use a volumetric flask (having a capacity equal to the amount
of solvent delivered in five minutes or longer) and a stopwatch.
When measuring the flow rate, connect a back pressure coil
or column to the outlet port to obtain a back pressure of 10.0 ~
20.0 MPa.
Measure the flow rate after the pressure has stabilized.
F0: Set flow rate
F: Measured flow rate
P: Measured pressure
(MPa)
The above equation can be
rearranged as follows:
F
F
P
PRESS COMP
=
× +
×
0
4
1
10
(
)
For example, when P is 10.0 MPa and the PRESS COMP
value is increased (decreased) by 1, the flow rate increases
(decreases) by approximately 1%.
Input the PRESS COMP value calculated above.
Figure 3.6 Flow Rate Calibration Step 2
FLOW COMP: 118
PRESS COMP: 4.7
[SHIFT] [EVEN/3]
FLOW COMP: 115
PRESS COMP: 4.7
No
Yes
Flow rate calibration
Step 1 completed
Flow rate compensation
screen
Measure the flow rate
Calculate the PRESS
COMP value
Flow rate
compensation
screen
Measure the flow rate
Has the required flow rate
accuracy been attained?
Flow rate calibration
Step 2 completed
FLOW COMP
F F
F
=
−
×
0
0
PRESS
