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We are very happy that you have decided to upgrade your pH probe in your KH keeper. The process is virtually the same as the replacement of the regular pH probe. In this guide, we’ve described the lab-grade pH probe replacement with easy-to-follow steps and the instructional video.

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1. Remove the transparent front cover

2. Unscrew four screws holding the backplate and remove it

3. Take out the regular pH probe and the red nozzle from the glass beaker

4. Twist the orange pump head counterclockwise until it clicks and slide it of off the motor shaft

5. Loosen the four screws holding the head mounting plate

6. While holding the nut from the inside drive the screw holding the stepper motor. You will need to remove both screws to remove the motor.

7. Remove the motor

8. Unplug the BNC connector. The plug is locked and it has to be twisted counterclockwise to release it.

9. Remove the pH probe

10. Put the lab-grade pH probe BNC connector through the hole, connect the BNC plug, and lock it by twisting it clockwise.

11. Put the cable in the cutout below the mounting hole for the reagent pump

12. Install the stepper motor and screw it in

13. Put the backplate on and screw the four screws in place

14. Flip the KH keeper and tighten four screws holding the head mounting plate

15. Slide the reagent pump back onto the shaft into the groves and twist it clockwise until it clicks

16. Put the red reagent nozzle back into the glass beaker

17. Slide the remaining lab-grade pH probe cable back into the device housing

18. Place the holding adapter (white part with the cutout) on the lab-grade pH probe’s signal cable and move it towards the pH probe as far as possible. Please don’t use excessive force.

19. Unscrew the cap holding the protective liquid container

20. Remove the container and the cap from the lab-grade pH probe

21. Put the lab-grade pH probe inside the glass beaker. The probe should be held in the stand by the adapter

22. Fill the beaker with aquarium water to about 60ml mark

23. Keep the lab-grade pH probe in the water for about 30 minutes

24. Proceed with the calibration of the new pH probe. You can find more about this here - Calibration process for KH Keeperkeeper's pH probe

Here is the instructional video:

Best regards,

Reef Factory Team