Servomex SERVOPRO k2001 - 9.3 Problem causes

User Manual SERVOPRO Plasma Trace N
2
Analyzer
9.0 MAINTENANCE AND TROUBLE SHOOTING
53
9.3 Problem causes
PROBLEM POSSIBLE CAUSE REMEDY
Power is on but display is
still off
• Fuses, or power cord
not connected
• Connect power cord or
replace fuse
Display is off, fuses are
OK, power cord is
connected
• DC power supply
• LCD contrast power
supply
• LCD display damaged
• Replace each module
sequentially until
problem is fixed
Display comes on but
nothing displays
• LCD controller display
• CPU board
• Contrast potentiometer
has been affected
• Replace each module
sequentially until
problem is fixed
• Re-adjust contrast potent.
on CPU board
ppm reading still at zero
or negative, flow OK
• Cell module
• I/O board
• Replace cell module
(call factory)
• Replace I/O board
No flow reading • Flow valve or flow
transducer
• Replace flow module
Flow reading is erratic • Inlet pressure too low
• Flow module
• Increase inlet pressure
until flow is stable
• Set flow higher than 20 cc
• Replace flow module
ppm reading going on
and off scale
• Flow oscillating around
20 cc
• Set flow higher than 20 cc
ppm reading wandering
or drifting, on X10 or
X100 range
• Moisture in sample
• Sample line leaking
• Unstable flow
• Vent not at
atmospheric pressure
• Replace sample trap
• Check sample line for
leaks
• Check flow and vent
pressure