Ecotech Acoem Serinus 30 - Page 160

Serinus® 30 User Manual 3.3
Page 160
Ensure particulate filter has been
recently changed.
Ensure tubing is not kinked or
blocked.
Ensure vacuum pump is correctly
installed and operating.
Sample flow not at 1 slpm
Multiple possibilities
Check/replace sample filter.
Check pump.
Check valves.
Check/replace sintered filter.
Re-calibrate pressure sensors.
Unstable flow or pressure readings
Faulty pressure sensors
Check pressure calibration.
Check calibration valve block is
functioning and not blocked. If
unable to diagnose problem, check
the voltage across TP1 and TP2 of
pressure sensor PCA. Ensure it is
about 4 volts ± 0.3 volts. If unable to
diagnose problem, it may be a noisy
A/D converter, replace main
controller PCA.
Low span
Leaks
A leak in the instrument or
calibration system dilutes the sample
stream and causes low span readings
and noise.
Correlation wheel has leaked replace
correlation wheel.
Span calibration out
Adjust the span using the calibration
procedure (refer to Section 5.5).
No response to span gas
Leaks/blockages
Leak or blockages in tubes or valves.
Perform leak check and flow check
and repair any leaks/blockages.
Faulty calibration source
Ensure calibration gas is plumbed
correctly and is not contaminated or
has no leaks and is a certified
reference gas.
Hardware fault
Faulty Measurement cell.
Correlation wheel leaking
Replace correlation wheel.
Zero drift
Poor temperature control
Ensure instrument is operated in a
temperature controlled environment
with the lid on.
Faulty zero air
Ensure zero air source is not overly
polluted.
Leak
Perform a leak test (refer to
Section 6.4.4).
CO-CO
2
converter faulty
Replace CO-CO
2
converter.