Euromag EUROSONIC 2000 HH, User Manual

Page: 13 / 80

EUROMAG | 13
MEASUREMENT
2. MEASUREMENT
2.1 BUILT IN BATTERY
The instrument can operate either from the built-in Ni-MH rechargeable battery, which will last over 10 hours
of continuous operation when fully charged, or from an external AC/power supply from the battery charger.
The battery charging circuit deliver both constant-current and constant-voltage charging methods. It has a
characteristic of fast charging at the beginning and very slow charging when the battery approaches to full
charge. Generally, when the green LED is on, the battery is nearly 95% charged, and when the red LED is off,
the battery is nearly 98% charged.
The charging current becomes automatically smaller and smaller when approaching the full battery level,
so that there should be no over-charging problem. This also means that the charging progress can last very
long. The charger can be connected to the handset all the time when an around-the-clock measurement is
required.
When fully charged, the terminal voltage reaches about 4.25V. The terminal voltage is displayed on window
M07. When running out of battery, its voltage drops below 3V. The approximate remaining working time is
indicated in this window as well.
Notice that the battery remaining working time is estimated based on the current battery voltage. It may have
some errors, especially when the terminal voltage is in the range from 3.70 to -3.90 volts.
For Battery maintenance and replacement, please refer to
Appendix A.
2.2 POWER ON
Press key to turn on the device and press to turn it off.
Once the flow meter is turned on, it will run a self-diagnostic program, checking first the hardware and then
the software integrity. If there is any anomaly, corresponding error messages will be displayed.
Generally, there should be no display of error messages, and the flow meter will go to the most commonly
used Menu Window #01 (short for M01) to display the Velocity, Flow Rate, Positive Totalizer, Signal Strength
and Signal Quality, based on the pipe parameters configured last time by the user or by the factory.
The flow measurement program always operates in the background of the user interface. This means that the flow
measurement will keep on running regardless of any user menu window browsing or viewing. Only when the user
enters new pipe parameters the flow meter will change measurement to reflect the new parameter changes.