Spectrex Quasar 900 Open-Path Gas Detection System - Manual (Page 57)

Periodic Maintenance 45
8 Troubleshooting
Table 14: Troubleshooting
Problem Cause Solution
“Maintenance call”
status or R and S are
below 2V DC at Gain
9
Poor alignment Perform alignment
Dirt on the
window Clean the window
Poor light source Replace the light source
Detector fault
Replace/repair Detector
NQRat below the
permitted limit Gas in the path Make sure that the path is
clean and the weather
conditions are good
NQRat above the
permitted limit Poor alignment Perform alignment
Temperature higher
than 25° C beyond
the room
temperature
Electronic
problem Replace/repair Detector
Ratio1 and Ratio2 out
of the limit Poor alignment Perform alignment
Dirt on the
window Clean the window
Detector fault Replace/repair Detector
Voltage less than 16V
DC. The Detector at
“V” fault
Low input
voltage Check the power supply and
installation