Hach PHC745, User Manual

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Problem Possible cause Solution
Procedure problem causes slow
stabilization and prevents
accurate calibrations or
measurements.
The filling hole is closed. Open the filling hole during
use.
Air bubbles are around or
below the probe tip. Carefully tap or shake the
probe to remove air bubbles.
The electrical connection
through the reference junction
is not sufficient. Loosen the sleeve junction
more. Shake the probe in the
solution from side to side to
refresh the reference junction.
The stir speed is too slow or
too fast. Try a different stir speed.
An incorrect buffer solution
was used or the buffer
solution has contamination. Use the specified buffer
solutions of good quality.
The protective tape was not
removed from the filling hole. Remove the tape from the
filling hole. Refer to
Preparation
for use on page 5.
Section 10 Consumables
Note: Product and Article numbers may vary for some selling regions. Contact the appropriate distributor or refer to
the company website for contact information.
Description Quantity Item no.
Electrode filling solution, saturated KCl 59 mL
1
25118026
Electrode cleaning solution for regular maintenance 500 mL 2965249
Electrode cleaning solution for minerals/inorganic
contamination
500 mL 2975149
Electrode cleaning solution for proteins/organic
contamination
250 mL C20C370
Electrode cleaning solution for fats, oils and grease
contamination
500 mL 2964449
10.1 Recommended standards
Description Unit Item no.
pH 4.01 buffer solution, Singlet one-use packets, 20 mL each 20/pkg 2770020
pH 7.00 buffer solution, Singlet one-use packets, 20 mL each 20/pkg 2770120
pH 10.01 buffer solution, Singlet one-use packets, 20 mL each 20/pkg 2770220
pH 4.01 and pH 7.00 buffer solution kit, Singlet one-use
packets, 20 mL each
2 x 10/pkg 2769920
pH 7.00 and 10.01 buffer solution kit, Singlet one-use packets,
20 mL each
2 x 10/pkg 2769820
1
Larger quantities are available.
English 19