Auto Setup Menu; Saturation Index Overview - Pentair intellichem Installation And User Manual

Auto Setup Sequence
Auto Setup
See page 6 for details.
SAT Index Overview
Saturation Index
The Saturation Index (SI), also called the Langelier Index, is a chemical equation or
formula used to diagnose the water balance in the pool. The Saturation Index formula
is SI = pH + TF + CF + AF - 12.1 (or 12.2 for salt pools). To calculate the Saturation
Index, you must first test the pool water for pH, temperature, calcium hardness, and
total alkalinity. Refer to a chart for assigned values for your temperature, hardness,
and alkalinity readings then add these to your pH value. Subtract 12.1 (or 12.2 for salt
pools), which is the constant value assigned to Total Dissolved Solids and a resul-
tant number will be produced. A result between +/-0.3 indicates balanced water. Test
results not within these values require chemical adjustments to achieve balance. This
formula is more or less reliable but not guaranteed. In some cases, individual read-
ings for pH, calcium, and Total-Alkalinity might be beyond normal recommendations,
however, combined within the formula can produce "balanced water." The SI is useful
to pinpoint potential water balance problems.
To access the Sat Index menu:
Press MENU / Saturatn Index 
Press / and /to adjust the Saturation Index values.
pH Menu

ORP Menu
Saturatn Index
Configuration
Sat Index Menu
Note: The pH, Temp, and SLT are entered automatically as the numbers are available from
the measurement and automation system. Each time this display is entered, if available,
the current temperature is obtained from the INTELLITOUCH
System), SLT is obtained from the INTELLICHLOR
these values can be changed on this screen for calculation purposes.
pH: Enter the current pH value.
Temperature: Enter the current temperature setting.
CH: Enter the current calcium hardness level.
SLT: Enter the current salt level or Total Dissolved Solids (TDS) level if no SCG is used.
TA: Enter the current total alkalinity value.
CYA: Enter the current cyanuric acid value.
SI: Displays the last calculated SI value (Corrosive/Scaling/Ideal). Note: If there is no
flow or Flow Delay is enabled, no SI value displayed.
pH: 6.0 Temp:
77F
CH: 250 SLT1000
TA: 90 CYA:18
pH: 6.0 Temp:
77F
CH: 250 SLT1000
TA: 90
pH: 6.0 Temp:
77F
CH: 250 SLT1000
TA: 90 CYA:18
INTELLICHEM
CYA:18
, EASYTOUCH
®
Salt Chlorine Generator (SCG). But
®
Controller Installation and User's Guide
®
25
Control
®