Emerson Rosemount 700XA Reference Manual page 130

Operation and maintenance
June 2022
Figure 5-19: Igniter/thermocouple assembly photo
A. Back plate
B. Connectors
• Resistances measured between pins 1 and 2 shall be 0.5 - 1.2 ohms.
• Resistances measured between pins 3 and 4 shall be less than 4 ohms.
Recommended actions
130
1. Detach connectors.
Voltage between pins 1 and 2 on extension cable end shall measure 3.0 to 3.3
Vdc while igniting. You can manually ignite with the Detectors pop-up window.
If no voltage is measured, you may need to replace the photomultiplier tube
(PMT) module or extension cable.
2. Remove black plate.
Igniter shall glow red while igniting or if you apply 3 Vdc to pins 1 and 2 on
burner end. Do not apply more than 3.3. Vdc to igniter. Do not apply voltage to
igniter for more than 20 seconds.
Reference Manual
2-3-9000-744
Emerson.com/Rosemount