Chemtrac SCM2500XRD - General Guidelines; Streaming Current Value Response Factors

Chemtrac Systems, Inc. Page 41
SECTION 4.0 GENERAL GUIDELINES
4.1 STREAMING CURRENT VALUE RESPONSE FACTORS
Upscale Excursions: (Streaming Current Value (SCV), goes more positive)
Caused by:
R Decrease in pH
R Decrease in raw H
2
0 flow
R Decrease in color
R Decrease in raw water turbidity
R Decrease in lime
R Decrease in caustic
R Decrease in anionic polymers Increase in aluminum sulfate, or PAC
R Increase in cationic polymers Increase in chlorine
Downscale Excursions: (Streaming Current Value (SCV) goes more negative)
Caused by:
R Increase in pH
R Increase in H
2
0 flow
R Increase in color
R Increase in raw water turbidity
R Increase in lime
R Increase in caustic
R Increase in anionic polymers
R Decrease in aluminum sulfate, or PAC
R Decrease in cationic polymers
R Decrease in chlorine
Assumes that this is only parameter changing at the time.
NOTES
R Potassium Permanganate usually has no appreciable effect on the SCV (at
normal dosages of 1-2ppm).
R Increasing conductivity will drive the SCV toward zero.
R Change in lag time may affect the SCV.