Top Ten Questions for pH Testing Equipment

Accurate pH testing requires keeping electrochemical testing equipment functioning properly. Regular checks and maintenance support the longevity and reliability of all equipment. Sometimes, small issues occur that are simply a byproduct of using the equipment and can be easily solved through simple solutions. The following list of questions has been compiled as a resource for solving some of the most common issues related to pH tester function.

1. Why won’t my pH Tester turn on?

Possible reasons include improper installation or dead batteries. It could also mean that there is an electronic malfunction in the unit.

Suggestion:

Reinstall existing batteries or replace them with new ones. If attempts to fix do not succeed, you might need to replace the tester itself.

2. Why does my pH tester intermittently not turn on or off or respond incorrectly to the keypad commands when I press them?

This could mean that there is an electronic malfunction in the unit between the command buttons and the unit function. It could also mean that the keypad is defective.

Suggestion:

Replace the tester.

3. Why does my pH tester take so long to register a stable reading?

This result could be an electrode error. It is possible that the electrode was dry or not properly conditioned/maintained for use. It is also possible that the reference junction is on the verge of being clogged.

Suggestion:

Ensure electrodes are properly maintained, filled with, and stored in the appropriate buffers and solutions by creating a management system for this purpose. If you need to use the electrode immediately and suspect it is dried out, attempt to pre-soak it before use.

4. How often do I need to calibrate my pH tester?

Suggestion:

Each manufacturer creates its own user manuals and includes instructions and suggestions for the maintenance and care of their units. However, a good general rule is to calibrate at least once every day that the unit is used.

5. What kinds of uses should I avoid with a pH tester?

Suggestion:

Never use a pH tester in liquids with high concentrations of heavy metals, sulfides, proteins, oil, or in TRIS buffers. It is also not recommended for use in temperatures above 122°. Avoid solvents known to melt corrodenylon or any slurries where large particles can break the glass pH electrode bulb.

6. What applications are ideal for the pH tester?

Suggestion:

Suggestion applications for testing include:

• Treated Wastewater
• Potable Water
• Boiler Feed and Cooling Tower Water
• Swimming Pools
• All types of Naturally Occurring Waters (Lakes, Streams, Ground, and Ocean Water)
• Agriculture
• Aquaculture
• Hydroponics
• Chemical Applications
• Water Purification Processes (R.O. and Deionizing)
• Food and Beverage Water Testing
• Chemical Process Water

This is not an exhaustive list, but it represents a good sampling of potential uses for pH testers.

7. How can I tell if a pH tester has been misused?

Suggestion:

If the sticker in the battery compartment shows ink bleeding, the tester has been exposed to water. Look for signs of rust in the tester as well. Other indicators could include a broken pH electrode bulb, a cracked casing, and a crushed reference junction plug at the bottom of the pH tester.

Exposure to chemicals, as mentioned in item 5 will cause a black or dark brown stain on the reference junction plug. If issues with the reference junction persist, users can consider purchasing a double junction electrode instead.

8. How do I de-code error messages on my pH tester?

Suggestion:

As mentioned in item 4, each manufacturer creates its own user manuals and includes instructions and suggestions for the maintenance and care of their units. You will likely find a legend for understanding error codes in the user manual for your testing unit. If you need help sourcing your product manual, please contact customer service at [email protected].

9. What accessories should I have to keep my pH tester functioning properly?

Suggestion:

Manufacturer’s user manuals are always the best reference for your specific pH testing unit. Some general suggestions include fresh calibration buffers at pH 7 and one of either pH 4 or pH 10.

Electrode storage solution helps keep testing electrodes humidified, and this can be accomplished by moistening a piece of paper towel or a small sponge to place in the cap of the electrode storage container.

Using an electrode cleaning solution for weekly soaks helps keep electrodes functioning properly. It is helpful to use a carrying case to transport the pH tester for storage and protection. In addition, consider keeping a laminated copy of instructions with the unit for ease of use.

10. Can I use the pH tester for EPA or ASTM procedures?

Suggestion:

It is always recommended to check the manufacturer’s specifications. Most of these test procedures require resolution and accuracy of 0.1 pH and two-point calibrations. Checking the specific requirements of the tests you plan to perform will help you choose the correct tester model for your purpose.