Envent 330 Cleaning Instructions

Envent Engineering Ltd.

Cleaning Instructions

CAUTION: Do not use solvents, brake clearner, soaps or detergents.
During startup or plant upset situations, the hydrogen sulfide 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.
Note 1: Leave the sweep valve on the sample filter slightly open at all times. This will decrease the
likelihood of contamination.
Note 2: The flowmeter should be inspected for liquids and to ensure the float moves freely.

Material List

Cleaning kit part number: 330900
 Alconox Laboratory cleaner or equivalent residue free cleaning agent
 Do not use solvents, detergents or soaps!
 Fresh water
 100% Isopropyl Alcohol
 Do not use rubbing alcohol!
 Do not use brake cleaner product!
 Large bucket to mix cleaning solution
 Rinse bottle

Procedure

Step 1. Mix a 1% (2-1/2 tbsp per gallon) of Alconox in warm water
Step 2. Sample line tubing
a. Shut off flow at the sample point prior to sample conditioning system
b. Flush the sample line and components with cleaning solution
c. Rinse with fresh water
d. Flush with isopropyl alcohol
e. Dry with clean, dry instrument air or gas
Model 330 & 331
Hydrogen Sulfide Analyzers
Last Updated: November 28, 2011
Revision: 1
1/2