Hach Ultra MET ONE HHPC-6, User Manual, Page: 34 / 51

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Section 5 Maintenance
DANGER
Only qualified personnel should conduct the tasks described in this section of the
manual. Service should be performed only by factory-authorized personnel.
5.1 Battery maintenance
The battery symbol indicates the relative battery charge status, described in Table 6 . The
dark section of the battery indicates the charge that remains in the battery.
The power supply provided with the MET ONE HHPC–6 serves as a battery charger and
a direct power source. Connect the power supply for continuous and long-term sampling.
To charge the battery:
1. Connect the external power supply as described in section 3.3.4 on page 14 .
2. Turn on the MET ONE HHPC–6. The battery indicator displays a
+
(single plus sign)
to indicate that the external power supply is attached.
3. To place the MET ONE HHPC–6 into a fast charge mode, turn the MET ONE
HHPC–6 on and wait for 15 seconds. Attach the MET ONE HHPC–6 to the external
power supply.
Note: If the MET ONE HHPC–6 is not powered up when the external power supply is attached,
it indicates that the battery is charged with a trickle charge.
5.1.1 Charge a drained battery
To charge a drained battery:
1. Attach the external power supply to the MET ONE HHPC–6.
2. Wait for five minutes. Turn on the MET ONE HHPC–6.
3. If the battery indicator does not display a
++
(double plus sign) within 15 seconds,
detach the external power supply. Wait for 15 seconds and attach the external power
supply again. The battery indicator will display a
++
(double plus sign) within 15
seconds.
4. Leave the MET ONE HHPC–6 attached to the power supply until a
+
(single plus
sign) is displayed.
5.2 Calibrate the MET ONE HHPC–6
Return the MET ONE HHPC–6 to the manufacturer annually for recalibration according to
the JIS B 9921–1997 standards. The calibration date is displayed on the manufacturer
decal on the back of the MET ONE HHPC–6.
Table 6 Battery status indicator
Indicator Charge Mode Description
+ (single plus sign) Trickle charge
The battery goes into trickle charge in one of the following instances:
• The battery is 95% charged
• The battery temperature reaches the cut off point due to rapid charge
• External power supply is attached to a unit that is almost completely
charged
++ (double plus sign) Rapid charge
The battery goes into rapid charge in one of the following instances:
• Power supply is first connected and has not yet fully charged the unit
• Battery charge drops below 95% capacity