Advertisement
Operation
Diagnostics Menu
Sample/Reference
3-56
Model 48i Trace Level-Enhanced Instruction Manual
Pressure
The Pressure screen (read only) displays the current optical bench pressure.
The pressure is measured by a pressure transducer in-line with the optical
bench.
In the Main Menu, choose Diagnostics > Pressure.
●
Flow
The Flow screen (read only) displays the current sample flow rate. The flow
is measured by an internal flow sensor.
In the Main Menu, choose Diagnostics > Flow.
●
The Sample/Reference Ratio screen (read only) displays the ratio of the
intensities of the light source through the sample wavelength and reference
Ratio
wavelength of the bandpass filter wheel. Normally, when zero air is being
sampled, the sample/reference ratio is between 1.00 and 1.18. A ratio
outside may indicate that the filter wheel is dirty or the infrared source is
degraded.
In the Main Menu, choose Diagnostics > Sample/Ref Ratio.
●
PRESSURE:
RANGE
AVG
DIAGS ALARM
FLOW:
RANGE
AVG
DIAGS ALARM
743.0 mmHg
0.508 LPM
Thermo Fisher Scientific
Advertisement
Troubleshooting
