HF scientific 19944 Triple Validation Turbidimeter - 0-100 NTU - Manual (Page 31)

TVT2 (5/02)
Rev. 1.7 (.pdf) 26
9.0 Troubleshooting/System Alarm Relay
9.1 System Warning Message(s)
The instrument routinely performs self-diagnostics and will automatically generate
warning messages to provide you with specific diagnostic information about the
instrument. These are only messages and they do not indicate failure of any component
in the instrument. Normally, the cause of a warning message is external of the
instrument. The following table lists the warning messages and their associated
meanings:
WARNING ASSOCIATED MEANING TYPICAL CAUSE
W01 Lamp failure Lamp has too low an output or the 0.02
NTU calibration standard was
contaminated.
Attempt to recalibrate. If this does not
remedy the problem, the lamp must be
replaced followed by a recalibration.
W02 Calibration failure The wrong standards were used in
calibration or there is an internal sensor
failure of the instrument.
W03 Analog loop failure Analog loop connection is open. Verify
your wiring if you are using the analog
output. If not, turn off the option in the
setup menu.
W04 Flow Error If the flow switch is option installed,
this indicates a loss of flow of process
to the instrument. If the flow switch is
not installed, turn off the option in the
setup menu.
O-r Sample Over-Range The sample turbidity level is greater
than the instrument will measure (either
11 NTU or 110 NTU depending on your
model).
WNG Multiple Warning conditions are
met
A combination of warning conditions
has been met. Typically, this condition
arises when the setup for the analog
output and the flow switch are not set
correctly.
If any of the above conditions occurs, the message will be indicated on the lower row of
the display.
9.2 System Error Message
The instrument will also automatically generate error messages. An Error message is
generated when there is a significant problem found with the operation of the instrument.