9. Troubleshooting
- 74 -
Symptom/Display FAULT
Causes
Actions
Sensor unit
abnormalities
E-1 SENSOR
●
The unit is not
connected or
improperly
connected.
Check that the sensor unit is connected and the
connectors of the unit are securely fastened.
Errors in
communication with
the unit
Replace the sensor unit with a new one.
Zero drift caused by
environmental
changes or aging
deterioration is out
of the range of zero
follower.
Perform zero adjustment. If the symptom persists
after the zero adjustment, replace the sensor unit with
a new one.
Faults of the unit
itself
Check the sensor unit and replace it with a new one.
If it is apparently damaged, do not touch it with bare
hands and handle it carefully.
Flow rate warning
FLOW
○
Unstable flow
caused by
deteriorated
performance of the
pump
Seemingly the pump is worn out and its performance
is deteriorated. Although gas detection can be
performed under this condition, the pump unit must
be replaced as soon as possible.
Unstable flow
caused by clogged
dust filter
Replace the dust filter.
Unstable flow
caused by bended
or clogged suction
tube or exhaust tube
Fix the defective parts.
Pressure difference
is present in the
sampling condition.
(The flow rate is
ensured even
though the pump
drive level is low.)
In some sampling conditions (presence of pressure
difference between IN and OUT), the flow rate is
ensured even though the pump drive level is low.
Although the gas detector can be used in such a
situation, the diagnosis function of its pump drive level
issues this message. The message can be eliminated
by disabling this function. (See “7-2. Regular
maintenance mode”)
Check the operating conditions before taking actions.
* If the flow rate indicator is incorrect, the message
may be displayed even though pressure difference
is not present.
Abnormalities are
found in regular
maintenance of the
flow sensor.
Seemingly the performance of the flow sensor is
deteriorated.
In this case, the flow rate may not be in the range of
0.5 L/min ±10% even though the flow rate indicator
indicates the specified value.
Although gas can be detected provided that flow loss
(fault alarm) does not occur, the flow sensor must be
replaced to fix the symptom. Please contact RIKEN
KEIKI.
