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TELEDYNE API
Instrument Maintenance Technical Manual - M100E UV Fluorescence SO2 Analyzer
218
10.3.8.2. CHECKING THE SCRUBBER’S EFFICIENCY
CAUTION
THIS PROCEDURE REQUIRES THE USE OF MOTHBALLS. MOTHBALLS OFTEN
CONTAIN NAPHTHALENE AND/OR PARADICHLOROBENZENE. BOTH OF THESE
AVOID PROLONGED BREATHING OF VAPORS. ENSURE THAT THE WORK AREA IS
WELL VENTILATED.
USE GLOVES WHEN HANDLING MOTHBALLS.
STORE MOTHBALLS IN AN AIRTIGHT CONTAINER PREFERABLY IN A SEPARATE
ROOM FROM THE ANALYZER.
To check the ability of the scrubber to efficiently remove hydrocarbons from the sample air:
1. Disconnect the sample gas supply line from the sample inlet at the back of the analyzer.
2. With the instrument operating, watch the SO
2
concentration reading on the analyzers front panel display.
Wait until the reading stabilizes (probably somewhere near 0 ppb).
3. Place a mothball near the sample inlet.
4. Watch the SO
2
concentration reading for 30-40 seconds.
If the scrubber is working properly the reading should remain stabile.
If the reading rises significantly (more than 2-3 ppb) the hydrocarbon scrubber must be replaced.
Contact Teledyne API’s Customer Service.
04515F DCN6048