Emerson Rosemount Oxymitter 4000 Reference Manual page 117

July 2018
Figure 8-11. Fault 9, High Heater Temp
LOI
When Fault 9 is detected, the LOI displays the "O
comments and procedures in paragraphs 1 through 4 above.
1.
2.
3.
Troubleshooting
Unscrew and remove the LOI module from the electronic assembly.
Reconnect power to the Oxymitter 4000.
Perform the diagnostic steps 1 through 4 shown for the membrane keypad.
Rosemount Oxymitter 4000
Temp Hi" message. Refer to the
2
mV, then an Open
Heater fault will be displayed
3. Power down the electronics.
electronic assembly per "Ele
Assembly Replacement" in S
Maintenance and Service. U
measure the resistance acro
heater connector, J8.
4. If the heater is good, the read
approximately 70 ohms. If th
see "Heater Strut Replacem
Section 9: Maintenance and
LOI
When Fault 8 is detected, the LO
Temp Low" message. Refer to the
procedures in paragraphs 1 throu
117