Purging The System - Hach EC1000 Instruction Manual

6.3 Purging the System

Note: If any air bubbles are
detected, purge
the system.
1. Remove the storage cap from the electrode.
2. Loosen the four screws on the face of the pump to allow fluid through the
pump tubing.
3. Connect the syringe (with the plunger all the way in) to the side port of the
priming tee.
4. Turn the priming tee handle to the FILL position (Figure 21 [Fill]).
5. Withdraw about 3 mL of electrolyte. Expel about 0.5 mL of electrolyte to clear any
trapped air bubbles in the tee. Turn the priming tee handle to the PURGE position
(Figure 21 [Purge]). With the syringe still attached, tighten the four pump head
screws. Be sure the tube through the pump runs straight across the fingers, and is
not pinched permanently closed.
6. Purge all the air from the electrode line by holding the electrode up-side-down and
pushing electrolyte through with the syringe (Figure 21 [Purge]).
Do not push air back into the system. Turn the priming tee handle to the RUN position
(Figure 21 [Run]).
7. Disconnect the syringe.
8. Turn the pump on and look for fluid flow out of the electrode.
9. Reset electrolyte time (see Section 2.2.7 Reference Solution Timer).
72