Myron L 6PFCE and 4P - Manual (Page 14)

3. Press or .
4. Take reading. A display of [- - - -] indicates an overrange condition.
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 flowing sample is recommended.
1. Ensure pH protective cap is secure to avoid contamination.
2. Hold instrument at 30° angle (cup sloping downward).
3. Let sample flow 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.
C. Measuring pH (6PFC E )
1. Remove protective cap by rotating while grasping and pulling up.
2. Rinse pH/ORP sensor well and conductivity cell cup 3 times
with sample to be measured. Shake out each sample to
remove any residual liquid.
3. Refill both sensor well and cell cup with sample.
4. Press .
5. Note value displayed.
6. IMPORTANT: After use, fill pH/ORP sensor well with Myron L
pH Sensor Storage Solution and replace protective cap.
If Myron L pH Sensor Storage Solution is unavailable, use a
strong KCl solution, a pH 4 buffer, or a saturated solution of
table salt and tap water (ref. Cleaning Sensors, 2. pH/ORP, pg.
34). Do not allow pH/ORP sensor to dry out.
D. Measuring ORP
The Ultrameter II features the ability to measure the activity of oxidizing or
reducing chemicals in solution as ORP mV. The instrument also includes
an innovative Free Chlorine Equivalent (FC E ) feature (Measuring Free
Chlorine Using FC E , pg. 12) that uses ORP and pH to measure free
available chlorine (FAC) concentration in ppm. ORP mV and ppm of
free available chlorine (FAC) are the two most commonly used sanitizer
units of measure in water quality management.
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