Thermo Scientific 450iQ Instruction Manual page 186

Troubleshooting
Troubleshooting Guide
6-2 450iQ Instruction Manual
Problem
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
2
or requires maintenance.
Zero air flow rate is
inadequate
Instrument is not
drawing in zero air
Span gas containing SO ,
2
H S, NO, or hydrocarbon
2
is contaminating system
Internal or external lines,
filters and other sample
handling equipment are
contaminated or dirty
Hydrocarbon kicker has
failed
High scattered light
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.
Replace the hydrocarbon kicker.
Toggle the "Flash Lamp" off in the
Settings>Measurement
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