Nq Ratio Above The Permitted Limit; Ratio Out Of The Limit; Voltage Less Than 16 Vdc - Emerson Rosemount 936 Reference Manual

Troubleshooting
October 2021
8.3

NQ Ratio above the permitted limit

Host status = F
0-20 = 1 mA
Light-emitting diode (LED) = yellow, blinking
Table 8-3: Potential Cause and Resolution
Potential cause
Poor alignment
8.4

Ratio out of the limit

Host status = F
0-20 = 1 mA
Light-emitting diode (LED) = yellow, blinking
Table 8-4: Potential Causes and Resolutions
Potential cause
Poor alignment
Dirt on the window
Detector fault
8.5

Voltage less than 16 Vdc

The detector is at V fault.
Table 8-5: Potential Cause and Resolution
Potential cause
Low input voltage
62
Resolution
Align.
Resolution
Align.
Clean the window.
Replace or repair the detector.
Resolution
Check the power supply and installation.
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Reference Manual
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