Riken Keiki GD-F4A-A, Operating Manual

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15
６－３．Replacing the sensor
６－３－１．Replacement frequency of the sensor
To maintain the reliability of the measurement, it is recommendable to replace the sensor periodically.
Our oxygen sensor has an enough life span. However, the actual life is depending on the operating
conditions. Then, replace the sensor once a year as the tentative deadline for the replacement cycle.
６－３－２．How to replace the sensor
① Verify that the indicator/alarm unit is off. If the sensor is disconnected, the indicator/alarm unit
issues an alarm.
② Turn a lock of detector head and open the front door.
③ Loosen two screws at the top of terminal strip and disconnect two lead (black and white) wires.
④ Loosen the screw for sensor stopper and take off the sensor stopper.
Pull out the sensor upward from the holder
⑤ Insert new sensor into the holder and push the sensor until it comes to the end.
Mount the sensor stopper and fix it with screw.
⑥ Connect black and white sensor lead wires to the terminal strip. Connect white wire to positive (+)
terminal and black wire to negative (-) terminal respectively.
⑦ Close the front door of the detector head and fasten a lock.
・Be sure to carry out gas calibration after sensor replacement. If not, correct gas detection may not be
performed.
Lead-wire (black)
Negative side cable core
Lead-wire (white)
Sensor
Sensor stopper
Sensor holder
Positive side cable core Cable
CAUTION