ATI Q46H/85 PAA System Part 7 – Calibration
52
O&M Manual
Rev F (8/17)
7.32 One-Point pH Cal
1. For this calibration method, the sensor may be removed, cleaned, and placed into a known
pH buffer, or, it may be calibrated on-line against a known reference value. If the sensor is
removed, thoroughly clean the pH sensor and place it into the pH calibration buffer, stirring is
several times before letting it rest in the beaker. Allow sensor to sit in solution long enough to
achieve temperature equilibrium with the pH buffer (maybe 5 minutes.) It is important that the
pH buffer be fresh and at room temperature.
2. Scroll to the CAL menu section using the MENU key and press ENTER or the UP arrow key.
3. Press the UP arrow key until Cal pH Type is displayed.
Press the ENTER key. The display will begin to flash. Using the UP arrow key, adjust the
displayed number to a 1 pt calibration type. This will allow the user to offset-adjust the
sensor input for one pH point. Once value has been adjusted, press the ENTER key and the
message Accepted! will be displayed.
4. Scroll to the next menu item by pressing the UP arrow key once. The menu item Cal pH
buf1 will be displayed.
5. Press the ENTER key. The display will begin to flash. Using the UP and LEFT arrow keys,
adjust the displayed number to the known value of the pH buffer. If the sensor is till mounted
in the process, enter the known reference value. The exact temperature compensated
number for pH buffers is typically written on the side of the buffers shipping container. Once
value has been adjusted, press the ENTER key.
6. The message Accepted! will be displayed, or an error describing the cause the failure. The
system is now two-point calibrated for pH.
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