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