Take A Measurement; Measure Conductivity; Measure Resistivity (Mp-4 And Mp-6 Models) - Hach MP-4 User Manual

Operation
Turns on the meter, measures conductivity, and exits any function
1 COND—
1
(MP-4 and MP- 6 only)—
2 RES
any function
3 TDS—Turns on the meter, measures TDS, and exits any function
4 ORP (MP-6 and MP-6p only)—
function
Scrolls up and stores value to memory
5 UP/MS—
6 MR/DOWN—
7 CAL/CMC LR—
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.

3.4 Take a measurement

To take a measurement:
Rinse the sensor cup with test solution three times and refill.
1.
Note: If testing solutions that are highly concentrated or at extreme temperatures, more
rinsing is required.
Push the desired measurement key.
2.
Note: To prevent auto shut off, push the measurement key again and as needed.
Observe or record the value displayed, or push UP/MS to store the reading.
3.

3.5 Measure conductivity

To measure conductivity:
Rinse the conductivity cup three times with the sample to be measured. This
1.
conditions the temperature compensation sensor and prepares the cell.
Fill the conductivity cup with the solution.
2.
Push the COND key.
3.
Observe or record the value displayed, or push UP/MS to store the reading. A
4.
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.
Make sure the pH/ORP sensor protective cap is secure to avoid contamination
1.
(MP-6 model).
Scrolls down and recalls stored memory information
Enters the calibration mode, clears the memory, and provides
Turns on the meter, measures resistivity, and exits
Turns on the meter, measures pH, and exits any
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