Digital Control System

Purex fume extractors with the Digital Control System offer both the performance and inbuilt safety features to help ensure people are protected from hazardous fumes. The status of the system is shown on a clear graphic display which is simple to use and easy to understand.

Digital fume extractor fascia

Grahic display


Features:

Flow ControlFlow control icon for purex fume extraction systems

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 ControlSpeed control icon for purex fume extraction systems

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. The graphic display shows you the real-time actual airflow so you know precisely how the machine is performing at that time.

InterfacingInterfacing icon for purex fume extraction systems

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.

Motor Run IconMotor run icon for purex fume extraction systems

Shows the operator when the fume extractor's blower is running.

 

 


Safety Sensors:

Gas SensorGas sensor icon for purex fume extraction systems

Purex 'Digital' fume extractors incorporate a gas sensor in the exhaust to protect workers. The sensor helps ensure 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 SensorParticle sensor icon for purex fume extraction systems

Purex 'Digital' fume extractors incorporate a particle sensor in the exhaust to protect workers. The sensor helps ensure 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
  • The wrong filter has been used

Filter Status SensorFilter blocked icon for purex fume extraction systems

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.

Temperature SensorTemperature icon for purex fume extraction systems

A safety feature to warn the operator if the fume extractor overheats.