Hanna Instruments HI 84181 User Manual

Page 17

CLEANING PROCEDURE
• Rinse the potassium electrode with deionised water. Check to see if the small scratches have

been eliminated.

• Soak the potassium electrode in a standard for one hour.
• Rinse with deionised water and blot dry.
REFERENCE ELECTRODE CLEANING
• Drain the old filling solution, rinse with an adequate HI 7076 solution, drain, then refill

with HI 7076 solution.

• Do not use an electrode if cristalised salts are visible inside the electrode. Drain electrode,

disassemble and rinse internal body with deionised water. Reassemble and refill with fresh

refill solution.

• The internal chamber of this electrode is gell filled. If the electrode has been left dry for long

periods of time the gell may be dehydrated and stable measurements may not be

obtainable. Disassemble electrode and soak internal assembly in HI 7076 filling solution.

Verify the ceramic is wetted by the fill solution. Warming the solution slightly (50 °C)

before soaking will hasten this process. Permit the electrode to cool completely while

immersed in this solution.

QUICK CHECK OF THE ELECTRODE SLOPE
• Connect the electrode and the reference electrode to the instrument.

• Press and hold down ESC, and HELP keys simultaneously and power on the meter. Wait

until the instrument enters in the reading check mode.

• Place 50 mL of deionized water into the beaker with a stir bar.

Preparation of reference electrode:

• Unwrap Parafilm

seal found over ceramic junction on inner stern of the reference electrod

and discard. This is only used for shipping.

• Rinse inner stern with deionized water making certain to wet o-ring found on the inner stern.

• Reassemble reference electrode by gently pushing the inner assembly into the outer body,

sliding spring down cable, and screwing cap into place.

• Remove fill hole cover and o-ring or fill hole spout.

• Using the dropper pipette provided, add a few drops of HI 7076 filling solution to the

reference electrode, wetting the o-ring and rinsing out the fill solution chamber.

• Holding the body of the electrode depress the black cap with your thumb. This permits the

fill solution to drain out of the body. Verify if the electrode returns to its original position.

(You may need to gently assist for this to occur).

• Tighten the electrode cap onto the body and fill electrode body with HI 7076 filling solution

until fill solution volume is just below fill hole.

• Place sensor and reference electrode into electrode holder and connect the Cable Connectors

to the instrument.

Note: During measurement always operate reference electrode with the fill hole open.