Pentair HAFFMANS RPU-352 Instruction Manual page 46

HAFFMANS RPU 352, RPU 353, RPC 80 RPC 50
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2) When I switch the instrument on it often has less charge in it than when I switched it off.
Why?
When the instrument is switched off and left unused the battery gradually loses charge by a
process known as "self discharge". When it is next switched on the instrument estimates how
much charge has been lost in this way and compensates by reducing the charge percentage.
3) How long should I leave the instrument connected to the charger?
There is no need to leave the instrument on the charger after the battery shows 100% which is
full charge. You should not leave the charger connected for more than 24 hours.
4) How long will the battery last?
The specification shows examples of the instrument running time that can be expected from a
fully charged battery.
The service life of a battery will depend on the conditions of use. Giving an exact life time is
difficult. Heavy use at high pasteurising temperatures such as used for fruit juices will reduce
the life. Under such conditions a battery might be expected to last for about a year. With light
use and at beer pasteurising temperatures the battery might last for 2 years.
5) How is battery charging controlled?
The instrument continuously monitors its own battery use and any battery charging to gauge the
amount of charge that remains in the battery. This allows the percentage charge to be
displayed either as a number or as the black fill level on the battery information diagram.
Whenever the charger is connected the charge rate is controlled by the instrument taking into
account the state of charge and temperature of the battery and the total charging time.
Charging can be fastest when the battery is empty and cool but must be slower when the
battery is nearly full or is hot. The aim is to replace the charge as quickly as possible without
overcharging or overheating the battery. This ensures a long service life for the battery.
6) The display tells me that a new battery has been installed. I haven't fitted a new battery,
what's going on?
If you unplug the exchange unit (which includes the battery) and then reconnect it the
instrument will assume you have fitted a new battery. NEVER UNPLUG THE EXCHANGE
UNIT unless you intend to replace it with a new one. See the "Maintenance" section of the
operating manual.
If the battery voltage falls to a low level and then recovers it may appear as though the battery
was removed and replaced by a new battery. This can happen if the battery is failing to hold its
charge after a year or two of use. It might also happen if the instrument has been switched off
and left unused for a long period (six months or more).
A new battery must be charged to a certain level before use and so the instrument must be
connected to the charger for several hours. The instrument display gives information about this
commissioning process.
Page 46 of 112 RPU 352, RPU 353, RPC 80, RPC 50