Troubleshooting
Troubleshooting Guides
Thermo Fisher Scientific Model 49i Primary Standard Instruction Manual 5-3
Lamp Remove one cell and look for
blue light in hole of input
block
Lamp heater Check lamp temperature.
From the Diagnostics menu
choose Temperatures.
±15 volt power supply Check ±15 volts. From the
Diagnostics menu choose
Voltages.
Cell A or B noise
excessive
Foreign material in one cell Clean cell.
Defective detector Interchange detectors at
Measurement Interface
Board connectors to
determine if detector is
defective.
Cell A and B noise
excessive
Foreign material in
cells
Clean cells
Lamp failure Check for 1.7 volt peak to
peak waveform at lamp
current check point on Lamp
Power Supply Board
±15 volt power supply Check ±15 volts. From the
Diagnostics menu choose
Voltages.
Pressure transducer
does not hold
calibration
Pressure transducer Replace pressure transducer
Output signal
noisy
Recorder Replace or repair recorder
Sample is varying Run instrument on stable
ozone source. If quiet, no
malfunction.
Foreign material in cell Clean cell
Sticky solenoid valve Replace with known good
solenoid valve.
Slow response Averaging time Verify averaging time is set
properly
Contaminated optical bench Clean bench and then
condition system overnight
Table 5-1. Troubleshooting - General Guide, continued
Malfunction Possible Cause Action
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