SAFETY
P
ROCESS
M
ANUAL
2-4
For a functional description of the light tower signals see table 1:
Signal
Mode
Description
Green
ON
Operational
No
warnings or messages
OFF
Not operational
Yellow
BLINKING
N
2
pressure-switch
No N
2
gas flow detected
Air pressure switch
No Air flow detected
Torch
temp
(750)
The
torch temperature has
to exceed 750
o
C
Torch Flame failure
There is no flame, the H
2
valve will be closed
Torch
H
2
/O
2
ratio
The H
2
/O
2
ratio exceeds
the safety value
Torch shell
The skin temperature of the
torch is too high
Temperature
sensor
powerpack
Temperature powerpack is
too high
Bubbler temp
Bubbler temp is too high
Bubbler level
Fluid level is too low
O
2
- low
O
2
flow is too low
Exhaust (Low/High)
Exhaust flow out of limits
Limit alarm (only if
programmed in the process
recipe)
Actual value is out of limits
Wait for operator (only if
programmed in the process
recipe)
Operator action is required
to continue
Process is finished
Boat manual
Servo driver is in manual
mode
Maintenance
mode
Maintenance mode is
activated
OFF
No alarm and/or alert
Red
BLINKING
Excess temperature
controller has been activated
Tube is overheated
(Optional)
Leakage detection
A gas or water leak has been
detected
OFF
No alarm and/or alert
No actual dangerous or
hazardous situation
Table 1 Light tower signal description
