RKI Instruments GD-70D Series - Manual (Page 72)

9 Troubleshooting
GD-70D - 72 -
Symptom/Display FAULT Causes Actions
Zero drift caused by
environmental changes or
aging degradation is out of the
range of zero follower. Perform the zero adjustment. If the symptom is
persisted after the zero adjustment, replace the
sensor unit with a new one.
Faults inside of the unit Replace the sensor unit with a new one.
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 detector can be used in such a
situation, the diagnosis function of its pump drive
level issues this message. You can disable this
function to eliminate the message. (See "7-2.
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.
Flow Rate Warning
FLOW
○
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 our sales department.
Protective rubber cap is not
removed. Remove the protective rubber cap from GAS IN
and GAS OUT.
Broken pump Replace the pump unit.
Flow loss caused by clogged
dust filter Replace the dust filter.
Flow loss caused by bended or
clogged suction tube or
exhaust tube Fix the defective parts.
Flow Rate
Abnormalities
E-5 FLOW
●
Open circuit or defective
connection of flow sensor Please contact our sales department.
Communication cable
abnormalities Check the wiring of detector and related devices
around it.
Address abnormalities Set the address again.
Communication
Abnormalities
E-6
(NT specification)
○
Disturbance by external noise Turn off and restart the detector.
If such a symptom is observed frequently, take
appropriate measures to eliminate the noise.
Clock Abnormalities
E-9
○ Abnormalities of the clock
inside the detector Make a setting of Date/Time. Note that when the
sensitivity correction function of ESU is used,
correction may not be made properly.
If such a symptom is observed repeatedly, the
built-in clock is seemingly malfunctioning. Thus, it
must be replaced. Please contact our sales
department.