Hach-Lange PHC301-03 Instruction Sheet - Manual (Page 2)

2
Assembly
Important Note: When taking a sample reading, the filling hole must be open.
1. Remove the electrode from the electrode storage cap ( Figure 1 , item 6 ).
2. Rinse the electrode with deionized water and blot dry with a paper towel. Do not
scrub the bulb.
3. Open the filling-hole cap ( Figure 1 , item 2 ).
4. Cut the end of the filling-solution container.
Note: Do not cut too low. The dispensing tube is tapered to enable control over the flow of
filling solution.
5. Fill the electrode with reference electrolyte filling solution.
6. Attach a pair of color-code clips to the electrode and cable connector
( Figure 1 , item 3 ).
7. When ready to use, attach the electrode storage cap to the electrode storage cap lid
( Figure 1 , item 5 ) to prevent storage solution spillage and/or loss of the cap when not
in use.
Calibration
For calibration steps, refer to the HQ Portable Meters User Manual. The IntelliCAL™
probes store the current calibration and calibration history in the probe memory. It is not
necessary to recalibrate when moving a calibrated electrode from one meter to another.
Maintenance
Important Note: Never use this electrode in organic solvents.
Important Note: Do not scrub the bulb. If the bulb becomes fouled, immerse and agitate
in a warm dilute mild detergent solution for a few minutes, rinse well with deionized water,
and gently blot or air dry prior to reuse.
General Maintenance
• Before measuring a new sample, rinse the electrode with deionized water and blot dry
with a paper towel.
• If calibration errors occur, recalibrate using fresh, high-quality buffers.
• If the pH glass membrane is not properly hydrated soak the electrode in pH 4 buffer
for up to two hours.
• To minimize any shift in the reference junction potential, ensure that the speed of
stirring during calibration and sample measurement is consistent.
• If the reference junction becomes clogged, readings may be unstable, electrode slope
may be low, and/or buffers may not be auto-recognized during calibration. Soak the
electrode tip in a 60
°C water bath for 10 minutes. Be certain to keep the reference
electrolyte replenished to no lower than 1 inch (2.54 cm) of the filling hole.