5-4
TROUBLE DESCRIPTION SOLUTION
blocked
bypass line
Remove all input lines to unit.
Attach one line at a time to check for bypass
input. The line that causes flow failure is the
problem; check the line’s end-of-line filter.
2.
Check inlet fitting, tubing, orifices, bypa
ss
pr
essure switch, and bypass manifold tubing.
3.
Chec
k pressure switch for 4 VDC ON and OFF
switching (i
f sequencing); if single-point, it will
be ON constantly. Check cable terminals and
plug end at BP/SCN. Replace the bypass
pressure switch if necessary.
Check operation of all bypass valves
5. Leak test the flow system.
Start bypass flow Leaky or 1. Same as bypass flow failure.
failed blocked Check as above, turn unit OFF and restart uni
t.
bypas
s line at
uni
t startup 2. Leak test the flow system and restart unit.
Sensor flow failed Leaky or 1. Remove all input lines to the unit.
blocked Attach one line at a time to check for sample
s
ample line input. Check all end-of-line sample filters.
Sample flow failure is always the pres
ent
poi
nt being sampled.
2.
Remove the optical bench cover. Check the
inlet fitting, tubing, sample filter, tubing to the
opti
cal bench inlet fitting, outlet fitting from
the
opti
cal bench, sample pressure switch, an
d
s
ample manifold tubing.
3.
Check the sample pressure switch for 4 VDC
ON and OFF switching. Check the cable
ter
minals and plug end at press/sample con-
nector. Replace pressure switch if necessary.
4.
Check operation of all manifold sample valves.
Check the optical bench inlet and outlet valves.
5.
Check the optical bench inlet and outlet valve
c
onnectors on J22 and J21.
6. Leak tes
t the flow system.
Start sensor flow Leaky or 1. Same as sensor flow failure. Check as above;
failed blocked turn unit OFF and re-start unit.
sample flow
line at
2. Leak tes
t the flow system.
uni
t startup
Case temperature Main board 1. Return to MSA for service.
failed component
Case temperature Case 1. Return to MSA for service.
range failed temperature
i
s 0 to 90 °C
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