2
Installation
12
Pump P-960
User Manual 18-1172-73 Edition AA
2.6
Connecting the flow restrictor
If the sample vessel is placed at a higher level than the end of the sample
waste tubing, sample might flow to waste. Flow restrictor FR-902
supplied is used in the sample flow path to eliminate this siphon effect
by creating a back-pressure of 0.2 MPa. Thereby, sample vessels can be
placed, for example, on top of the system.
The position of the flow restrictor in the flow path depends on how the
sample is applied with the sample pump (see Table 2-1). The injection
valve position refers to when sample otherwise might flow straight
through to waste.
Table 2-1.
Position of the flow restrictor
When connecting the flow restrictor to the sample pump (Filling a
sample loop), use a 22 cm long tubing with suitable inner diameter
between the pump outlet and the flow restrictor IN port. Route the
tubing through the hole in the door and connect the flow restrictor
outside the door.
When connecting the flow restrictor to the injection valve, use a 10 cm
long tubing with suitable inner diameter between the flow restrictor IN
port and the injection valve.
Sample application type
Flow restrictor port IN
connected to
1
1
A tubing should be used between the flow restrictor and the port. See
instruction below.
Injection valve
position
Filling a sample loop
Sample pump P-960
outlet port
LOAD
Direct loading onto a column
Injection valve V1, port 4
INJECT
Loading a Superloop
2
2
The flow restrictor is required only if filling the Superloop several times
during the run.
Injection valve V1, port 5
INJECT
18117273aa.book Page 12 Thursday, July 3, 2003 5:13 PM