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<12. TROUBLESHOOTING>
12-2
IM 11P03A03-01E 6th Edition : Jan. 26, 2022-00
12.1.2 Error Descriptions
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Sensor Unit Errors (E-10, E-11)
A sensor unit error occurs when the sensor emf is outside the range of –50 mV to 400 mV.
Possible causes are:
(1) The pressure of the auxiliary gas dropped.
Check the auxiliary gas pressure.
(2) The flow rate of the sample gas was greater than the specified one.
Check the sample gas flow rate.
Remove the causes and then reset the error status using the following procedure.
(1) Switch to MAINT mode and enter the password.
(2) Change the Function Number to “41.” The DATA display shows “rES.”
(3) Press the EXEC key to reset the sensor emf error status.
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Constant Temperature Chamber Errors (E-20, E-21)
The temperature of the constant temperature chamber of the MG8G is normally stable at 60 °C
during a stabilization period and in steady state. When a constant temperature chamber error
occurs, turn the power off and on again to restart, and after the instrument enters a stabilization
period, check the temperature of the constant temperature chamber in Function No. 30. If the
temperature fluctuates, possible causes are:
(1) The power supply voltage fluctuates
(2) The ambient temperature is outside the specification range: –5 to 55 °C
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Constant Temperature Chamber Errors (E-22, E-23)
A constant temperature chamber error, E-22 or E-23, occurs while the instrument is in a warm-
up period. Turn the power off and on again. After the constant temperature chamber has cooled
down sufficiently, restart the instrument. If the same error occurs, there may be a failure in
components for temperature control. Contact Yokogawa Service.
(1) E-22: A possible cause is heater disconnection or action of the internal thermostat for over
temperature protection.
(2) E-23: A possible cause is a failure in parts for heater power control. When an E-23 error
occurs, the internal thermostat may be activated at the same time. The internal thermostat is
activated when the temperature reaches approximately 70 °C, but is not reset automatically
when the temperature drops.
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Analog Errors (E-30, E-31, E-32, E-33)
An analog error occurs when there is a failure in the analog circuit. Turn the power off and on
again to restart the instrument. If the error occurs again, contact Yokogawa Service.
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Memory Error (E-40)
A memory error occurs if there is a failure in reading or writing the memory device. Turn the
power off and on again to restart the instrument. If the error occurs again, contact Yokogawa
Service.