25
2009 AT8 M anual
• Displays the current calibrated reading of the pH
• If the reading needs to be corrected, use the up and down arrows to add or subtract the amount
of calibration. For example, if your controller is reading 7.4 and your hand check is reading 7.5
press the up arrow one time to change the reading to 7.5
5.3.1
Reading/ CAL # pH
Reading / CAL 1
pH : 2.5
NOTE: pH probes can only be cali/- 0.9 units.
• Press – SELECT to save and go on or press MENU to not save and return to reading screen.
• This shows you how much calibration you have on the probe. In the above example an
uncalibrated probe that read 7.4, but was changed to read 7.5 will have an offset of 0.1.
If the offset value gets to high it may be an indication of aged or malfunctioning probe.
5.3.2
pH Sensor # Offset
pH SENSOR
1
Offset
0.0
• Using the up and down arrows select the pH set point. This is the pH that your system will control to.
• Press – SELECT to save and go on or press MENU to not save and return to reading screen.
5.3.3
pH Setpoint #
pH SETPOINT 1
pH:
7.5
ACID
• Using the up and down arrows select the type of pH chemical that you will be feeding for
pH control. Acid or base.
• Press – SELECT to save and go on or press MENU to not save and return to reading screen.
5.3.4
pH Acid/Base #
pH ACID/BASE
1
CHEMICAL: ACID
