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Chlorine monitor maintenance

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Michael Strahand

on 24 October 2012

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Transcript of Chlorine monitor maintenance

What? Chlorine monitor
maintenance First line maintenance, process operators
Annual Service carried out by FSE
All FSE have a spare probe and polariser
UU installed base a mix of DVAL and TVAL
600 UU personnel trained in 6 months United Utilities Tech1 level calibrate monthly
Tech1 do membrane /electrolyte
Previously only by Tech2, save money and more resource
Thames have planned mnt schedule agreed with ATi
Tech2/ICA carry out break down etc
All Tech 1 have been ATi trained
All Tech 2 ATi trained
Refresher training
Thames base is ALL TVU Thames Water Operator do cal and membrane/electrolyte
ME&I engineers scheduled for training
Installed base all DVU Severn Trent Best practice involves operators for all routine maintenance

Instrument tech. ICA, FSE etc for annual or break down issues

Monitors are reliable, different mind set

Low level maintenance will keep them running without instrument tech intervention Summary Scottish Water Operators do cal and membrane/electrolyte
ICA engineers for annual mnt
Installed base all singles and TVAL Issues? Membrane fouling. Mn/Fe Initial drop followed by months of stability
Don't do too often, do it based on slope Electrolyte loss Might be "real" and process induced, use small membrane holder and/or gel
Might be poor technique, training Buffer pumps Regular pump tube changes needed Depolox & Q46 differences? Q46 membrane sensor
Deplox open electrode Open electrodes become contaminated
Zero drift
Sensitivity loss
Mechanical cleaning needed
Electrodes wear out with time
Response changes Need regular maintenance and strip down Membrane prevents electrode contamination
Eliminates zero drift
Maintenance is all about the membrane South West Water Exclusively use CO2 buffering
No Fe/Mn issues
Operators cal & do membrane/electrolyte changes How many? UU: 600 pH cor
Thames:300pH cor, 200 liq buf
SWW:120 CO2 buf
YWS: 200 pH cor, 100 liq buf
ScotW:350 pH cor, 180 CO2 buf
STW: 300 pH cor, 12 liq buf
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