Manual

B. Measuring Resistivity

Resistivity is for low conductivity solutions. In a cell cup the value may

drift from trace contaminants or absorption from atmospheric gasses,

someasuringaowingsampleisrequired.

1. Ensure pH protective cap is secure to avoid contamination.

2. Hold instrument at 30° angle (cup sloping downward).

3. Letsampleowcontinuouslyintoconductivitycellwithnoaeration.

4. Press key; use best reading.

NOTE: If reading is lower than 10 kilohms display will be dashes: [ - - - - ].

Use Conductivity instead.

C. Measuring pH (D-6)

WARNING: When using a Digital Dialysate Meter™ to test the pH of

dialysate, ALWAYS perform a calibration check of the pH sensor at

the beginning and end of each work day or more often if required by

your clinic’s internal procedures (see pH Calibration, pg. 20).

1. Remove protective cap by grasping its sides and pulling up.

2. Rinse pH/ORP sensor well and conductivity cell 3 times with

sample to be measured. Shake out each sample to remove

any residual liquid.

3. RellpH/ORPsensorwellandconductivitycellwithsample.

4. Press .

5. Note value displayed.

6. IMPORTANT:Afteruse,llpH/ORPsensorwellwithMyronLpH

Sensor Storage Solution and replace protective cap. If Myron L

pH Sensor Storage Solution is unavailable, you can use a strong

KCl solution (preferred), a saturated solution of NaCl table salt and

tap water (next best alternative), or a pH 4 buffer (least desirable

alternative). NEVER use distilled water or plain tap water as this

will quickly deplete the sensor (ref. Cleaning Sensors, 3. pH/ORP,

pg. 35).

Do not allow pH/ORP sensor to dry out.

D. Measuring ORP (D-6)

1. Remove protective cap by grasping its sides and pulling up.

2. Rinse pH/ORP sensor well and conductivity cell 3 times with

sample to be measured. Shake out each sample to remove

any residual liquid.

3. RellboththepH/ORPsensorwellandtheconductivitycell

with sample.