MPI-520 – USER MANUAL
6.4 General principles regarding using Ni-MH accumulators
- If you do not use the device for a prolonged period of time, then it is recommended to remove the
accumulators and store them separately.
- Store the accumulators in a dry, cool and well ventilated place and protect them from direct sunlight.
The temperature of the environment in the case of prolonged storage should not exceed 30ªC. If the
accumulators are stored for a long time in a high temperature, then the occurring chemical processes
may reduce their lifetime.
- Accumulators NiMH resist normally 500-1000 charging cycles. The accumulators reach their maximum
capacity after being formatted (2-3 charge and discharge cycles). The most important factor which in-
fluences the lifetime of an accumulator is the depth of discharge. The deeper the discharge of the accu-
mulator, the shorter its lifetime.
- The memory effect is limited in the case of NiMH accumulator. These accumulators may be charged
at any point with no serious consequences. However, it is recommended to discharge them completely
every few cycles.
- During storage of Ni-MH accumulators they are discharged at the rate of approximately 30% per month.
Keeping accumulators at high temperatures may accelerate this process even 100%. In order to prevent
excessive discharge of accumulators, after which it would be necessary to format them, it is recom-
mended to charge the accumulators from time to time (even if not in use).
- Modern fast chargers detect both too low and too high a temperature of accumulators and react to the
situation adequately. Too low a temperature should prevent the start of the process of charging, which
might damage the accumulator irreparably. An increase of the temperature of the accumulator is a signal
to stop charging and is a typical phenomenon. However charging at a high temperature of the environ-
ment apart from reducing the lifetime causes an accelerated increase of the temperature of the accu-
mulator, which will be not charged to its full capacity.
- Remember that in the case of quick charging accumulators are charged to approximately 80% of their
capacity; better results may be obtained if the process of charging is continued: the charger goes then
to the phase of charging with a low current and after next couple of hours the accumulators are charged
to their full capacity.
- Do not charge or use accumulators in extreme temperatures. Extreme temperatures reduce the lifetime
of batteries and accumulators. Avoid placing devices powered from accumulators in very hot environ-
ments. The nominal working temperature must be absolutely observed.
7 Cleaning and maintenance
NOTE!
Apply solely the maintenance methods specified by the manufacturer within the present
manual.
The casing of the meter may be cleaned with a soft, damp cloth using all-purpose detergents. Do
not use any solvents or cleaning agents which might scratch the casing (powders, pastes, etc.).
Clean the probe with water and dry it. Before the probe is stored for a prolonged period of time it is
recommended to grease it with any machine lubricant.
The reels and test leads should be cleaned with water and detergents, and then dried.
The electronic system of the meter does not require maintenance.
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