Troubleshooting - Fuji Electric ZKME Instruction Manual

Phenomena
No display Converter fuse blown out
Indication does Filter and/or flow guide tube
not change or clogged
slow response
Sensor deterioration
Decrease in flow velocity of
exhaust gas
Temperature Break of wiring
alarm Wrong wiring
continues for Source voltage is too low.
more than 10
Break of thermocouples
min. after
Blown heater fuse
power
Break in detector heater
switched ON
Automatic Difference between calibration
calibration is gas concentration and its setting
not possible
Wrong parameters setting
The calibration is prohibited in
the contact input of the external
terminal block.
The heater is set to off at the
contact input of the external
terminal block.
Zero and/or Difference between calibration
span alarm gas concentration and its setting
or misconnection between zero
and span gas
Indication too Loose flange and its
high or too low surroundings Deteriorated O-
rings
Detector is faulty.
Abnormal detector temperature
Indication difference between
dry and wet base measurement
INZ-TN1ZKME-E

9.5 Troubleshooting

Probable causes Checking methods (normal value)
Check the fuse and supply voltage
specification.
Visual check of filter and flow guide
tube for contamination or clogging.
Check for loosen and gas leaks at piping
connections and mounting place of
detector.
Change over between zero and span gas
and check if 5 minutes or longer is
needed for 90% response.
Check response to process gas after
shutting down calibration gas.
Move the direction (mounting position)
of "arrow" of the flow guide slightly.
Cable check of wiring
Wiring check
Check of supply voltage specification
Break check
Cable check of fuse
Check heater resistance
50 to 55Ω for 115V, 200 to 250Ω for
220V (Excluding wiring resistance)
Check the set value for calibration gas
concentration.
Check automatic calibration intervals.
Check if the calibration is not prohibited
in the contact input of the external
terminal block.
Check if the heater is set to off at the
contact input of the external terminal
block.
Check the set value for calibration gas
concentration.
Check piping.
Check for gas leaks in detector and
mounting part of flow guide tube flange.
Check for leaks from the outside.
Check for gas leaks at calibration gas
inlet.
Check sensor voltage (mV) for higher or
lower than other detector when flowing
zero gas. (See "6.5 Oxygen detector
standard output voltage")
Refer to check items for detector
temperature alarm described above.
Oxygen concentration is higher in dry
base.
- 47 -
Remedy
Replace fuse Check
Power supply voltage
Clean or replace filter
Tighten pipe
connections
Replace sensor
Increase process gas
Flow into the flow
guide tube.
Replacement
Correct wiring
Check power supply
Replace sensor
Replace fuse
Replace sensor
Set proper value
(Refer to "10.2.7")
 Set proper
parameters
 Set proper
parameters
 Correct wiring
 Set proper
parameters
 Correct wiring
 Set proper value
 Correct wiring
 Tighten mounting
screws
 Replace sensor
 Seal
 Tighten connectors
 Replace sensor
 Replace sensor
 Normal