What is the correct storage (and filling) solution for an IntelliCAL pH probe?

Document ID

Document ID TE2927

Published Date

Published Date 30/04/2019
Question
What is the correct storage (and filling) solution for an IntelliCAL pH probe?
Summary
pH storage and filling solution
Answer
The correct solution for storage of any Hach non-refillable pH probe is pH Electrode Storage Solution, 500 mL (Catalog Number/Order Code 2756549). This includes the PHC101 and PHC201.  

PHC301 and MTC301 use pH Electrode Storage Solution, 500 mL (Catalog Number/Order Code 2756549) for storage. For These probes also use Internal Filling Solution, MTC301 and PHC301, 28 mL (catalog number/order code 2841700).  

PHC281 uses IntelliCAL PHC281 Filling Solution, 2.44M KCl, 59 mL (Catalog Number/Order Code 2965026) for both filling and storage.  

PHC805 uses pH Electrode Storage Solution, 500 mL (Catalog Number/Order Code 2756549) for both filling and storage. 3M KCl Storage/Refill Solution, 50 mL (Catalog Number/Order Code 2756559) is the same solution in a smaller bottle with a a spout suitable for refilling the electrode.

All red rod electrodes use saturated KCl for both filling and storage. IntelliCAL RED ROD Saturated KCl Refill Solution, 59 mL (Catalog Number/Order Code 25118026) is in a bottle which has a spout suitable for refilling the electrode. Saturated KCl Storage/Refill Solution, 500 mL (Catalog Number/Order Code 25118049) is a larger bottle which has a lower cost per unit volume and can be used to fill storage bottles and refill filling solution bottles.  KCl Crystals (Radiometer Analytical), 15 g (Catalog Number/Order Code S21M001)  should be added to the filling solution of red rod probes to maintain saturation.  The probes that follow these instructions include: PHC705, PHC725, PHC735, PHC745, PHC705A, and PHC729.