Digital Control System with Graphic Display
A dedicated control system for Purex fume extractors has been developed to
include comprehensive features on the Laserex, Superflow and Powerflow
ranges. The status of the system is shown on a graphic display which is simple to use and easy to understand.
The 'Digital' control system constantly monitors the airflow, filter status and air quality to ensure the safety of personnel and to ensure that extraction remains constant with the longest possible filter life.
Features include:
AUTOMATIC FLOW CONTROL
Essentially, automatic closed loop flow control ensures that the extraction
rate remains constant. It does this by slowly increasing the speed
of the blower as the filter begins to block, this overcomes the resistance
to airflow through the filter and keeps the extraction rate constant.
This function is important because a falling extraction rate can cause
problems. For example:
- Particles can adhere to laser lenses causing expensive damage
- The temperature profile on soldering ovens can be affected
- People may inhale dust and fumes which escape due to weak extraction
- Products can become contaminated with dust
- Conveyors or equipment may need to be cleaned more often to prevent
breakdown
Another benefit of flow control is extended filter life which means
lower costs and less downtime for filter changes.
SPEED CONTROL
The extraction airflow can be set to the optimum level for the application,
the Purex fume extractors will then adjust the blower speed until the
actual airflow
matches the target airflow and the Flow Control system keeps it at
that level.
This is particularly useful when an extractor is fitted to equipment
such as a laser or reflow oven that specifies an exact extraction
volume to operate.
GAS SENSOR
Purex 'Digital' fume extractors incorporate a gas sensor in the exhaust
to protect workers. The sensor ensures that gas from the process cannot
pass through the extractor, into the wokplace without an alarm being
triggered. A gas escape may occur if:
- Filters are saturated
- Filters are damaged or missing
- A seal is damaged
- The wrong filter has been used
The sensor is also used to warn the operator when the chemical filter
needs replacing.
PARTICLE SENSOR
Purex 'Digital' fume extractors incorporate a particle sensor in the
exhaust to protect workers. The sensor ensures that particles from
the process
cannot pass through the extractor, into the wokplace without an alarm
being triggered. Particle escape may occur if:
- Filters are damaged or missing
- A seal is damaged
INTERFACING OPTION
The fume extractors alarm signal can be interfaced with other equipment
such as a laser or wave soldering machine to stop the process, set
off an alarm
or perform another function such as turning on a beacon. Alarm signals
can include:
- Filter blocked
- Gas alarm
- Particle alarm
The fume extractors can also STOP/START automatically with interfaced
machines. A run on timer is also available to ensure dust and fume
is extracted after the process stops.
FILTER STATUS MONITOR
Fume generated by the process will slowly block the particle filter
over time. When the particle filter is nearly blocked the
fume extractors will warn the operator with an audible chime and the
keypad will flash red.
This feature allows the operator
time to acquire a replacement particle filter before the
current one becomes completely blocked.
When the particle filter is completely blocked then the
fume extractors will chime and the keypad will flash every second.
At this point
the particle filter icon will flash to show which filters
may need attention.
MACHINE TEMPERATURE MONITOR
A safety feature to warn the operator if the fume extractors overheats.
MOTOR RUN INDICATOR
Shows the operator when the fume extractor's blower is running.
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