Troubleshooting
System Troubleshooting Guides
Thermo Fisher Scientific
Mercury System Manual
4-7
Alarm
Message
Possible Cause
Action
Alarm - I/O Exp
Status
Alarm -
Motherboard
Status
connected properly
Defective board
properly. Cycle AC power to instrument.
If still alarming, change board.
Table 4–4
describes possible zero and calibration malfunctions and
provides the recommended action to take to restore the system to normal
operation.
Table 4–4.
Troubleshooting – System Zero and Calibration
Malfunction
Possible Cause
Action
Cannot zero instrument or
there is a high background
signal when sampling zero
air (zero air should produce
a reading equivalent to less
than 1 µg/m
3
multiplied by
the dilution factor).
Zero air system is
faulty, needs new
scrubbers or requires
maintenance
Test against an ultra-zero cylinder from
a reputable scientific gas supplier or
check effect of a new chromatography
grade activated charcoal scrubber
installed at the instrument inlet.
Zero air flow rate is
inadequate
Verify that the zero air system is
providing adequate flow.
Instrument is not
drawing in zero or
span gas
Check sample flow and pressure
readings (Diagnostics menu).
Ensure that zero/span valves are
functioning.
Use an independent flow meter to
check flows at the zero inlet and
exhaust bulkheads (they should
match).
Perform a leak test.
Internal or external
lines, filters, and
other sample
handling equipment
are contaminated or
dirty
Replace inlet filter (if installed) and as
much of the tubing as possible with
clean Teflon only.
High scattered light
Go to Instrument Controls, select Lamp
Compensation and toggle to OFF. If the
previously high signal drops to zero or
System Zero and
Calibration
Troubleshooting
Summary of Contents for Mercury Freedom 80i
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