Maintenance Schedule & Procedures Teledyne API T801 NDIR CO2 Analyzer Operation Manual
178
10.3.4. PERFORMING A SAMPLE FLOW CHECK
CAUTION
GENERAL SAFETY HAZARD
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.
1. Attach the Flow Meter to the SAMPLE inlet port on the rear panel (Figure
3-4). Ensure that the inlet to the Flow Meter is at atmospheric pressure.
2. Sample flow should be 120 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 9.4.2).
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.
10.3.5. CLEANING EXTERIOR SURFACES OF THE T801
If necessary, the exterior surfaces of the T801 can be cleaned with a clean damp
cloth. Do NOT submerge any part of the instrument and do NOT use any
cleaning solution.
