Yokogawa Low Concentration (ppm) Zirconia Oxygen Analyzer OX400 - Manual (Page 56)

<7. Inspection and Maintenance>
7-3
IM 11M10B01-01E
Note) If an error (ERR) occurs, the heater is turned off. To clear the error, you need to turn the power off and then on. It is
recommended to turn the power off and then on to see whether the error occurs again. Be careful because if the power of the
OX400 is turned off, the contact output “OPEN.”
7.3 How to Replace Sensor
When the sensor has deteriorated, replace it with a new sensor. As for the part number, see CMPL at
the end of this manual. Be sure to perform calibration after replacing the sensor.
Replace the sensor according to the following instructions.
7.3.1 Removing Sensor
1) Turn off the power, and be sure to pull the power cord out of the socket.
2) Wait for about 1.5 hours until the heater temperature falls to the ambient temperature level.
WARNING
Be sure to replace the sensor after the heater temperature has fallen sufficiently. Not doing so may
cause burn injuries.
3) To remove the upper cover, remove set screws at three points on the rear panel of the OX400.
4) Slide the upper cover backwards and remove it upwards.
WARNING
AVERTISSEMENT
Rear panel
Fan
Sensor
Heater
Side panel
When the upper cover has been removed, you can see the heater sensor.
Remove the three screws and slide the upper cover backwards.
!
INLET
OUTLET
N200
C US
R
172608 SERIAL
(RS-232)
FUSE
250V T3.15A
!
RCCOM
RC3
RC2
RC1
FAIL
DO PUMP
OFF
G
V
-
+
mA
-
+
MS1
MS2
MS3
MS
COM
MSI
COM
MSI2
MSI1
Figure 7.1 Removing Cover