Emerson Rosemount Oxymitter 4000 Reference Manual page 109

July 2018
Figure 8-7. Fault 5, Open Heater
LOI
When Fault 5 is detected, the LOI displays the "O
1.
2.
Troubleshooting
Remove power. Unscrew and remove the LOI module from the electronic
8-11
assembly.
Perform the diagnostic steps 2 through 4 shown for the membrane keypad.
Rosemount Oxymitter 4000
1. "
Heater Open" message.
2
1. Remove power.
2. Remove the electronic as
"Electronic Assembly Rep
Section 9: Maintenance an
3. Using a multimeter, meas
cross the terminals of heat
4. The measurement should
72 ohms. If the heater is o
Strut Replacement" in Sec
Maintenance and Service.
LOI
When Fault 5 is detected, th
"O2 Heater Open" message
1. Remove power. Unscrew
LOI module from the elec
2. Perform the diagnostic ste
shown for the membrane
109