Section 5 Maintenance; Temperature Extremes; Battery Replacement - Hach MP-4 User Manual

Section 5
Practice the following care and maintenance of the MP series handheld meters:
Rinse with clean water after each use
•
Always fill the pH/ORP sensor cup with Hach pH storage solution and replace
•
the protective cap when not in use.
Avoid solvents
•
Avoid drops. Shock damage can damage the meter and void the warranty
•

5.1 Temperature extremes

Solutions in excess of 71 ºC (160 ºF) should not be placed in the sensor cups. This
activity can damage the meter. The pH sensor can fracture if the meter's
temperature falls below 0 ºC (32 ºF). Take care not to exceed operating
temperatures.
Note: Do not leave an MP series meter in a vehicle or a storage shed on a hot day. This
activity can subject the meter to temperatures in excess of 66 ºC (150 ºF) and void the
warranty.

5.2 Battery replacement

If the meter is not completely dry before you open the meter, damage to the internal
electronics of the meter can occur.
Perform the following steps to replace the battery:
Dry the meter completely.
1.
Remove the four screws from the base of the meter.
2.
Open the meter carefully.
3.
Take care to detach the battery from the circuit board.
4.
Replace the battery with a new 9V alkaline battery.
5.
Replace the bottom housing, ensuring that the sealing gasket is installed in the
6.
groove of the top half of the case.
Replace the screws; tighten evenly and securely. Do not overtighten.
7.
Note: All data stored in memory and all calibration settings are protected during power loss or
battery replacement. Loss of time and date can occur, however, if the battery is removed for
more than 3 minutes (180 seconds).
Maintenance
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