Buchi Alltech 3300 ELSD - 6.2.2 Gas Flow Test; 6.2.3 Optics Test

BÜCHI Labortechnik AG
www.buchi.com
22
6.2.2 GAS FLOW TEST
1. Make sure the inlet gas pressure is set between 65 and
80psig before starting the test.
2. Turn off mobile phase flow. Wait several minutes for the
detector to stabilize.
3. In the software, select Maintenance/Tests/Gas Flow Test
and press Enter. The testing screen will then appear:
4. The test takes 4 minutes to complete. A timer bar will
appear showing how much time is left for the test.
5. The following steps occur during the Gas Flow Test:
•
Gas flow is set to 1.0, 2.0, 3.0, and 4.0L/min and
allowed to stabilize at each flow rate.
•
Minimum, maximum, and average gas flow rate values
are determined at each flow rate.
•
Test results are displayed. The gas flow is returned to
its pre-testing set point.
6. Passing requirements for the Gas Flow Test are:
•
Gas flow must be within 0.2L/min at each gas flow set
point (1.0, 2.0, 3.0, and 4.0L/min).
7. Once the test is completed, press Done to return to the
main screen, or press Test to repeat the test.
8. If the test has failed, refer to the following table, Gas Flow
Test Results, for possible fail messages and their
solutions.
GAS FLOW TEST RESULTS
RESULT
CAUSE
SOLUTION
Fail: Gas flow is
unstable.
Unstable inlet
gas pressure.
Gas flow meter
and/or valve
error.
Blocked
nebulizer.
Check stability
of gas source
and remedy if
necessary.
Contact your local
BUCHI Customer
Service office which
can be found on
www.buchi.com.
Clean or replace
nebulizer. Refer to
Section 5.2 for
details.
Fail: Gas flow is
lower than the
set point.
Gas supply valve
is closed.
Gas supply is low
or empty.
Blockage or leaks
in gas line before
the detector.
Open gas supply
valve.
Check gas supply
and replace if
necessary.
Check gas line for
blockage and leaks;
remedy/replace as
necessary.
Fail: Gas flow is
higher than the
set point.
Gas flow
calibration is not
correct.
Gas flow meter,
valve, or other
electronics error.
Contact your local
BUCHI Customer
Service office which
can be found on
www.buchi.com.
6.2.3 OPTICS TEST
1. Make sure the inlet gas pressure is set between 65 and
80psig before starting the test. Make sure the gas flow
source is connected to the 3300 ELSD with the valve
open.
2. Turn off mobile phase flow. Wait several minutes for the
detector to stabilize.
3. In the software, select Maintenance/Tests/Optics Test and
press Enter. The Optics Test screen will then appear: