Operation
17
3.4 Take a measurement
To take a measurement:
1. Rinse the sensor cup with test solution three times and refill.
Note: If testing solutions that are highly concentrated or at extreme temperatures, more
rinsing is required.
2. Push the desired measurement key.
Note: To prevent auto shut off, push the measurement key again and as needed.
3. Observe or record the value displayed, or push UP/MS to store the reading.
3.5 Measure conductivity
To measure conductivity:
1. Rinse the conductivity cup three times with the sample to be measured. This
conditions the temperature compensation sensor and prepares the cell.
2. Fill the conductivity cup with the solution.
3. Push the COND key.
4. Observe or record the value displayed, or push UP/MS to store the reading. A
display of [----] indicates an over range condition.
Note: Carefully fill conductivity cup to ensure that the air bubbles do not cling to the cell wall.
3.6 Measure resistivity (MP-4 and MP-6 models)
Resistivity is measured in low conductivity solutions. In the conductivity cup, the
value can drift due to trace contaminants or absorption from atmospheric gasses.
Therefore, measuring a flowing sample is recommended.
1. Make sure the pH/ORP sensor protective cap is secure to avoid contamination
(MP-6 model).
1COND—
Turns on the meter, measures conductivity, and exits any function
2RES
1
(MP-4 and MP- 6 only)—Turns on the meter, measures resistivity, and exits
any function
3TDS—Turns on the meter, measures TDS, and exits any function
4ORP (MP-6 and MP-6p only)—
Turns on the meter, measures pH, and exits any
function
5UP/MS—Scrolls up and stores value to memory
6 MR/DOWN—Scrolls down and recalls stored memory information
7 CAL/CMC LR—Enters the calibration mode, clears the memory, and provides
confirmation
1
The MP-6p meter has a MIN/SALT key instead of the RES key. The mineral/salt
measurement is a TDS value based on an NaCl profile.
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