Teledyne PEM-9002 - Digital flue gas analyzer - Manual (Page 45)

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Information on Charging the Battery
PEM9002 is equipped with an NiCad storage battery. The service life and capacity of the battery are considerably
affected by the way the instrument is charged and used. In order to make the handling safer, the instrument has a
load management unit.
If an NiCad battery is, for example, always charged from 80% to 100% and never run down to the final discharge
voltage, it will lose some of its capacity. This is called the 'memory effect' , i.e. the battery remembers to what
extent it is run down.
A part of this memory effect is suppressed in the in that the battery cannot be recharged until it has
dropped below 60%.
Constant overcharging, too, has adverse effects on the NiCad battery. In order to prevent this, the charged
capacity, the voltage and the temperature of the battery are monitored in the
.
When predefined limits are exceeded, the charging process is interrupted. After the appropriate parameters
have been neutralized the charging process is automatically restarted again.
The service life of the NiCad battery can be significantly reduced when the instrument is operated at
temperatures below 40 °F (5°C).
The graphic charge-level indicator of the (10 battery symbols), which appears in the one-line status
display during the calibration phase, helps the user estimate correctly the capacity of the battery. The instrument
continuously measures the incoming and outgoing current during operation and charging. Under normal
operating conditions, the instrument should be operated until the battery is completely run down. When this
advice is followed, the actual capacity of the NiCad battery will definitely be shown on the display.
PEM9002
PEM9002
PEM9002