Instruction manual

Removal of Membrane/Junction Deposits
When using the following procedures, do not immerse electrode
more than 1/4" above junction.
Protein — Soak in 10% pepsin in 0.1 M HCl for 15 minutes.*
lnorganic — Soak in 0.1 M tetrasodium EDTA solution for
15 minutes.*
Grease and Oil — Rinse with mild detergent or methanol solution.*
* After any of these cleaning procedures, hold junction open under running distilled
water, drain and refill the reference chamber and soak the electrode in pH Storage
Solution for 15 minutes.
Electrode Storage
To ensure a quick response and free-flowing liquid junction, the
sensing element and reference junction must not be allowed to
dry out.
Short-Term Storage (up to one week)
Soak electrode in pH Electrode Storage Solution, Orion 910001. If
Orion Storage Solution is not available, use about 200 mL pH 7
buffer to which about 1 g KCl has been added, as a temporary
substitute.
Long-Term Storage
The reference chamber should be filled and the filling hole covered.
Cover the sensing element and reference junction with its protective
cap containing a few drops of pH Storage Solution. Before returning
the electrode to use, prepare it as a new electrode.
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