Met One Instruments C-12, Руководство по эксплуатации, Страница: 37 / 41

C-12-9800 Rev A Page 37
7.5 Flow System Leak Checks
NOTE: Leak check should be performed with the tape installed.
The tape interface nozzles in the optical measurement module should be checked and cleaned on
a routine basis, in order to prevent flow leaks at the filter tape interface. This requires removing the
filter tape. With the measurement module open, the parts can be inspected and cleaned with a
cotton-tipped applicator if needed. Be sure to replace the tape prior to beginning the leak check.
The C-12 flow contains an easy to maintain flow system. To perform a leak test, remove the TSP
cap from the sample inlet and place the vinyl cap (pn: 770025) over the inlet tube. Navigate to the
TEST MENU > LEAK TEST menu as shown in Figure 7-10. The FLOW value is the output from
the internal flow sensor.
Press the PUMP ON softkey. This will turn on the pump at a fixed control point while the vinyl cap
is in place. The FLOW value should be 0.5 LPM or less for the leak test to be considered passing.
Figure 7-10 The C-12 Leak Test Menu
Once complete, press the PUMP OFF key to turn off the pump. Slowly release the vacuum in
the system (by easing off the vinyl cap) before exiting this screen. The warning screen shown in
Figure 7-10 will be displayed when exiting the Leak Test screen. Exiting the Leak Test screen
before releasing the vacuum will cause the vacuum to be released rapidly. This can damage the
tape and suck debris into the sample chamber which may require returning the monitor to the
factory for service.
Reconnect the TSP cap to the inlet sample tube and resume sampling operations.
7.6 Factory Service Interval
The C-12 recommended factory service interval is once every two years.
Factory service primarily consists of optical system cleaning, optics/detector checks, and a
calibration check (and recalibration if needed) against a factory standard. As-found calibration
checks can also be requested. Contact the Met One technical service department to schedule
service. A Return Authorization number must be obtained before the unit is returned. See Section
1.2 for contact details.
LEAK TEST
FLOW: 0.0 lpm
PUMP ON >>>>> WARNING <<<<<
SLOWLY RELEASE
VACUUM
EXIT