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12. Diagnosis and Alarms
12.1 Diagnostic messages
The LF232 converter is equipped with the function to diagnose such errors as setting errors, I/O errors
or internal errors of the instrument and shows the error messages on the LCD display or on the HHT
through communications. The diagnostic messages and their corrective actions are described below.
Setting error
If you try to set a constant or a unit exceeding the specified range in the setting mode, an error is
displayed to prevent erroneous setting.
LCD display Description Corrective action
* H.OVER SPEC.
Setting value exceeds the settable
range.
* L.OVER SPEC.
Setting value is below the settable
range.
* H.OVER C RATE
Count rate exceeds the settable
range.
* L.OVER C RATE
Count rate is below the settable
range.
Try to set a value within the
settable range again.
* MULTI RNG ERR
Span value setting does not satisfy
the multi-range requirements.
Try to set a span value that
satisfies the requirements.
High/low limit alarm
An alarm message appears if the flow rate indication goes out of the set range.
If the alarm is set to OFF, this function does not work. For how to set this function, see 8.2
“Parameter Check/Change.”
LCD display Description Corrective action
HIGH ALARM
Flow rate is above the high limit
set-point value.
Adjust so that the flow rate stays
below the set-point value.
H-HIGH ALARM
Flow rate is above the high-high
limit set-point value.
Adjust so that the flow rate stays
below the set-point value.
L ALARM
Flow rate is below the low limit
set-point value.
Adjust so that the flow rate stays
below the set-point value.
L-LOW ALARM
Flow rate is below the low-low
limit set-point value.
Adjust so that the flow rate stays
below the set-point value.