3 how to replace sensor, 1 removing sensor, Warning – Yokogawa Low Concentration (ppm) Zirconia Oxygen Analyzer OX400 User Manual

Page 56: Figure 7.1 removing cover, Inspection and maintenance

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<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

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