38
Calibration
4000 MiD® Instructions, V6695
7.
Disconnect the infusion line and the adaptor fitting from the SFI.
8.
The SFI is now clean and ready for use.
9.
To check the SFI is working as expected measure the output flow rate
(see „8.4 Liquid flow rate measurement“ on page 35).
Note:
The measured flow rate should be slightly higher
(~20%) than the desired flow rate defined from the spit ratio
In the event the SFI appears blocked and/or the measured flow rate is
incorrect, then replace the low flow tubing located inside the SFI (see „8.6
Spraychip assembly maintenance“ on page 38). If the problem persists
and/or you have any queries please contact KNAUER before using the
SFI.
9.6 Spraychip assembly maintenance
When the spraychip assemblies appear blocked and/or the measured
flow rates are incorrect, then the low flow tubing should be replaced. The
following sections detail the procedures for replacing the tubing in both
the DFI and SFI assemblies. The SFI/DFI tubing kit (A66919) will be re-
quired for the following sections.
9.6.1 Replacing the Direct Flow Interface tubing
The following procedure should be used to replace the tubing inside the
DFI.
1.
Place the DFI onto a clean surface.
2.
If fitted, remove the spraychip from the DFI (see „8.2 Removing and
replacing the spraychip“ on page 33).
3.
Unscrew the grub screw until the metal collar will rotate when twis-
ted.
Note:
Do not completely remove the grub screw from the
metal collar.
4.
Rotate the collar until the grub screw is in the ‘11 o’clock’ position,
gently remove/pull the metal collar from the body of the DFI (Fig. 37).
Fig. 23
DFI with PEEK screw and metal collar
5.
Using the PH1 Phillips screwdriver, loosen the three screws in the
main body of the DFI. Once the screws are loose remove the top
cover of the DFI (Fig. 38).
Procedure
DFI
Grub screw
Metal collar
PEEK screw
