Hach-Lange POLYMETRON 9240 Basic User Manual - Manual (Page 11)

Reference electrode installation
1. Remove the reference sensor from its box.
2. Remove the plastic reservoir from the bottom (the storage solution is KCl 3M) and install the O-
ring as shown.
3. With care, turn the bottom electrolyte tube ferrule with a maximum ¼ turn to lock it.
4. Remove the plastic plug on the entry port.
5. Install the reference electrode in the extreme left measurement chamber (No. 2 in
Figure 1
on page 6).
6. Connect the reference cable (the one without the blue label on it) to the reference electrode.
7. Connect the electrolyte tube to the entry port on the reference electrode.
Sodium ion selective electrode installation
Note: It is critical to preserve the integrity of the sodium ion selective electrode as much as possible. This is why
this electrode must be installed at the very last moment after all other adjustments.
1. Remove the sodium ion selective sensor from its box.
2. Remove the plastic reservoir from the bottom (the storage solution is standard tap
water) and shake gently (as you would a thermometer) to dispose of any bubbles.
3. Install the O-ring as indicated right.
4. Install the ISE in the center position of the measurement chamber (No. 1 in
Figure 1
on page 6).
5. Connect the AS7 cable (with the blue label) to the electrode.
C A U T I O N
After the electrodes installation, it is very important that none of the electrode heads are touching the bottom part
of the measuring cell.
Fill electrolyte reservoir
The electrolyte reservoir is located at the back of the analyzer (No. 12 in Figure 1 on page 6).
1. Take the KCl electrolyte bottle and insert the tip of the tapered spout into the reservoir inlet tube
as far as it will go but without exerting any extra pressure.
2. Squeeze on the bottle as many times as necessary to fill the reservoir to about 3/4 of its capacity.
If you have any difficulty filling the reservoir, raise the spout of the bottle very slightly to avoid an
airlock.
3. Using thumb and forefinger, pump on the electrolyte tube between the reservoir and the
reference electrode to remove any air bubbles that may have formed.
4. If necessary, clean any KCl drops from the analyzer and the reservoir.
English 11