Envent Engineering Ltd. Page 32 Revision 2.4
Sample Conditioning System Cleaning Procedure
During start-up or plant upset situations, the 330S/331S H
2
S analyzer may become
contaminated with amine or hydrogen sulfide scavenger solution. This may cause the
analyzer to read low (this can be determined at calibration). If the analyzer reads low,
it will require incremental increases in the gain to maintain calibration. Please refer to
factory calibration sheet for factory set gain factor. The scavenger solution is water
soluble and therefore is relatively easy to clean.
Material List
Cleaning Kit Part Number: 330900
• Alconox RBS Solid, powdered precision cleaner w/ MSDS (2.5 tbsp)
• 330079 – Rear window and gasket
• MIF-225-PP – Small nipple (x2)
• MIF-32-PVC – Grey nipple
• MIF-32-PP – Big nipple
• MIF-24-PVC – Humidifier replacement tube fittings (x2)
• MIP-4 Humidifier replacement plug
• 06349-40 – Black 1/8" male/female elbow
• LT-2-4 (1/4" x 11") – Tubing for sample chamber to humidifier
• LT-2-4 (1/4" x 10") – Tubing for flow meter to humidifier
• LT-3-5 (3/16" x 10") – Tubing for sample chamber to vent block
• PFA (24") – Tubing for flowmeter to bulkhead
Do not use solvents, brake cleaners, soaps, detergents or rubbing alcohol to clean up
analyzer or sample system.
Procedure
1. Mix a 1% (2-1/2 tbsp per gallon) of Alconox in warm water
2. Sample line tubing
• Shut off flow at the sample point prior to sample conditioning system
• Flush the sample line and components with cleaning solution
• Rinse with fresh water
• Flush with isopropyl alcohol
• Dry with clean, dry instrument air or gas
3. Sample conditioning system – Take pictures of SCS before disassembling
• Remove filter elements from filter housings and discard
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