Hach Ultra MET ONE HHPC-2, User Manual, Page: 28 / 42

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Section 6 Troubleshooting
6.1 Problems and recommendations
Table 5 lists the problems, reasons and the recommended actions that occur while using
MET ONE HHPC–2.
Table 5 Troubleshooting procedures
Symptom Cause Solution
MET ONE HHPC–2 does not
zero count.
Zero count filter or
hose barb is not
properly attached to
the unit.
Attach the filter or hose barb.
Internal air leak. Contact the customer service center for repair.
Cell contamination by
excessive dust
exposure.
Return the unit to a factory authorized service center.
The MET ONE HHPC–2 does not
turn on when the
POWER key is
pressed.
The battery voltage too
low. Connect external power supply to MET ONE HHPC–2 for
operation and charging. Then, turn on the power again.
MET ONE HHPC–2 unit does not
charge.
Connections to MET
ONE HHPC–2 unit is
proper.
Disconnect the power jack from the unit and the power cord
from the AC power source (wall receptacle). Disconnect the
cord/plug from the power supply and reconnect the cord/plug to
the power supply firmly. Restore all connections to the unit and
power source. If the problem persists, contact the customer
service center for repair.
Unable to download data in the
buffer.
No records in buffer Make sure there are records in the buffer.
Communication
parameter are not set. Make sure that the communication parameters of the computer
are set to 9600 baud, 8 data bits, no parity, 1 stop bit.
The connections are
not proper Check the connections between the MET ONE HHPC–2 and
the computer.
Unable to print data in the buffer.
No records in buffer Make sure that there are records in the buffer.
Communication
parameter are not set Make sure that the communication parameters of the printer are
set to 9600 baud, 8 data bits, no parity, 1 stop bit.
The connections are
not proper Make sure that the connections between the MET ONE
HHPC–2 and the printer.
MET ONE HHPC–2 display
shows the message, “CAL ALM.” The cell is
contaminated.
Connect the zero count filter and program the MET ONE
HHPC–2 to run for at least five minutes.
If the problem persists, contact the customer service center for
repair.