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Troubleshooting
Troubleshooting Guide
6-2
43iQ Instruction Manual
Problem
on front panel are on)
Solenoid current out of
range (option)
Pump current out of range
Cannot zero instrument or
there is a high background
signal when sampling zero
air. (Zero air should produce
a reading equivalent to less
than 15 ppb SO
.)
2
Possible Cause
Micro SD Card
Programming
Sticking or damaged
solenoid
Damaged or dirty pump
Zero air system is faulty,
needs new SO
scrubbers or
2
requires maintenance.
Zero air flow rate is
inadequate
Instrument is not drawing in
zero air
Span gas containing SO
,
2
NO or hydrocarbon is
contaminating system
Internal or external lines,
filters and other sample
handling equipment are
contaminated or dirty
Action
If Micro SD card was just
replaced, re-install the old one.
If the problem is fixed, request
a replacement Micro SD card.
Reset solenoid via
Settings>Health Check>Status
and Alarms>Valve and Pump
Resets screen. If damaged,
replace solenoid valve block.
Reset pump via
Settings>Health Check>Status
and Alarms>Valve and Pump
Resets. Inspect and refurbish
pump. If pump motor is
damaged, replace pump.
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.
Check by-pass or atmospheric
pressure vent to verify that the
zero air system is providing
more flow than the instrument
is drawing.
Check the sample flow and
pressure in the Settings>Health
Check>Status and Alarms>Flow
and Pressure screen.
Use an independent flow meter
to check flows at the sample
inlet and exhaust bulkheads
(they should match).
Perform a leak test as
described on page 5-5.
Verify that span gases
connected to the calibration
system are shut off and leak-
tight.
Replace inlet filter (if installed)
and as much as possible.
Thermo Scientific
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