Hach-Lange SENSION+ 50 49 User Manual - Manual (Page 14)

Table 2 Cleaning agent
Contaminant Cleaning agent Soak time
Mineral deposits 0.1 N HCl 5 minutes (maximum)
Fats, grease and oils Warm, mild detergent solution 2 hours (maximum)
Dissolved oxygen probe
Clean the probe
N O T I C E
Use only deionized water and/or the polishing cloth to clean the anode and cathode.
1. Remove the membrane module from the probe:
a. Hold the probe so it is vertical with the tip down.
b. Gently turn the membrane module to remove it from the probe.
2. Soak the membrane module in a mild soap solution.
3. Rinse the membrane module fully with deionized water.
4. Invert the membrane module and shake vigorously to remove any water.
5. Rinse the probe with deionized water. Blot dry with a lint-free cloth.
6. Rub the anode with the polishing cloth supplied. The anode is the outer metallic stem of the probe
that is visible when the membrane module is removed. The polishing cloth removes deposits that
can decrease the probe performance.
7. Fill the membrane module 2 /
3
full with filling solution and assemble the probe. Refer to Fill the
membrane module on page 12.
Replace the membrane module
N O T I C E
Carefully touch the membrane modules to prevent damage.
It is necessary to replace the membrane module periodically. Replace the membrane module when it
is damaged, the probe reading drifts or the probe has a slow response.
Fill the membrane module
Add filling solution to the membrane module if the level of filling solution in the membrane module is
less than
2 /
3
full.
1. Remove the membrane module from the probe:
a. Hold the probe so it is vertical with the tip down.
b. Gently turn the membrane module to remove it from the probe.
2. Add filling solution to the membrane module until it is approximately 2 /
3
full.
3. Install the membrane module on the probe:
a. Carefully tilt the membrane module to remove the air bubbles in the filling solution.
b. Hold the probe with the tip down and slightly tilted.
c. Slowly put the membrane module on the probe. Some filling solution should come out of the
threads of the membrane module. Remove any filling solution on the surface of the probe.
4. If no filling solution comes out of the threads, air may be inside the membrane module cap. Add
more filling solution to the membrane module and repeat step 3 .
12 English