Pentair AK110 Installation And User Manual page 129

PPM
CL
5
4.5
4
3.5
3
2.5
2
1.5
1
0.5
ORP
690 695 700 705 710 715 720 725 730 735 740 745 750 755 760 765 770 775
How to use this chart:
1. The values on the left side of the chart are free-chlorine PPM. The values on the
bottom are the approximate equivalent ORP Values. The gray boxes are pH values.
2. Use a DPD test kit to determine the current pH and PPM conditions of the system
you wish to control with the Acu-Trol Controller. The pool water should be balanced to your
desired pH and PPM levels before you calibrate the system.
3. Locate the PPM chlorine value on the chart that matches the PPM measurement
obtained with your DPD test kit. Follow the horizontal line across until it crosses into the gray
pH value box that matches the pH value obtained with your test kit.
4. Follow the approximate pH value down to the bottom of the chart to find the
approximate equivalent ORP value. This is the approximate ORP value your Controller should
read. A variation of +/- 20 ORP units may occur. This range in ORP is due to different mineral
contents of water in different areas. The ORP reading will fluctuate slightly depending on the
mineral content of your system.
5. When calibrating your ORP to a tested PPM value, use this charts approximate ORP
value as a starting point. Then adjust the ORP value until the PPM reading in the Controller
matches the PPM measurement obtained from your test kit.
ORP and PPM Chart
PPM v. ORP at pH 7.4-7.6
129