Teledyne GFC-7001E - Trace CO Analyzer - Manual (Page 266)

Maintenance Model GFC7001E Carbon Dioxide Analyzer
Teledyne Analytical Instruments 266
12.3.4. PERFORMING A SAMPLE FLOW CHECK
CAUTION
G
ENERAL
S
AFETY
H
AZARD
Always use a separate calibrated flow meter capable of measuring flows in the 0 – 1000
cm 3 /min range to measure the gas flow rate though the analyzer.
DO NOT use the built in flow measurement viewable from the Front Panel of the
instrument. This measurement is only for detecting major flow interruptions such as
clogged or plugged gas lines.
See Figure 3-2 for sample port location.
1. Attach the Flow Meter to the sample inlet port on the rear panel. Ensure that the inlet to the Flow Meter
is at atmospheric pressure.
2. Sample flow should be 800 cm 3 /min  10%.
3. Once an accurate measurement has been recorded by the method described above, adjust the
analyzer’s internal flow sensors (See Section 9.6.3).
Low flows indicate blockage somewhere in the pneumatic pathway, typically a plugged sintered filter or critical
flow orifice in one of the analyzer’s flow control assemblies. High flows indicate leaks downstream of the Flow
Control Assembly.
12.3.5. CLEANING THE OPTICAL BENCH
The GFC 7001E/EM sensor assembly and optical bench are complex and delicate. Disassembly and cleaning is
not recommended. Please check with the factory before disassembling the optical bench.
12.3.6. CLEANING EXTERIOR SURFACES OF THE GFC 7001E/EM
If necessary, the exterior surfaces of the GFC 7001E/EM can be cleaned with a clean damp cloth. Do not
submerge any part of the instrument in water or cleaning solution.