Teledyne IR-7000 - Non-dispersive infrared series - Manual (Page 63)

NDIR Gas Analyzer Maintenance 6
Teledyne Analytical Instruments., - Rev. 3 55
• Recalibrate the instrument (see Chapter 5). Check the gas flow
through the analyzer. With a new filter, the flow will increase.
Readjust the flow to 1.5–2.0 SCFH.
6.2 Service
The IR7000 is highly integrated and has very few user-serviceable
areas. This section covers:
• Removal of the optical bench and components for cleaning
• Replacing the IR source
• Replacing the battery (portable model only)
• Replacing the fuse
6.2.1 Removing the Optical Bench (Non-Explosion Proof)
Removal of the optical bench is for cleaning the sample cell or
replacing the IR source. For any other operation or repair, the analyzer
must be sent to the factory with the optical bench intact.
NOTE: Instruments with dual optical benches have 2 non-interchangeable
sample cells. To avoid confusion service only one optical bench at a
time.
To remove the optical bench:
1. Turn off the sample gas flow
WARNING: Depending on the sample system used, sample gas may be still
flowing in the sample lines. Make sure that the sample gas is turned
off before beginning this procedure.
2. Flush the instrument lines with nitrogen for 15 minutes.
3. Turn off the instrument and disconnect the power cord. It is
recommended that you install a lock-out device so that the
instrument cannot be powered back up until the lock-out device
is removed.
4. Loosen the screws securing the front panel and pull open the
drawer containing the optical bench and electronics.
WARNING: Hazardous voltage exists inside. Make sure that the instrument is
OFF and the AC power cord has been removed from the AC power
source.