Pneumatic vs. Electric Remote Controls for Abrasive Blasting

When it comes to abrasive blasting, remote controls play a crucial role in ensuring efficiency, accuracy, and safety. A remote control system is a required safety device. The control handle, often referred to as a deadman switch, is the trigger for the RC system. When the operator releases the RC handle, the machine deactivates, stopping air and abrasive flow through the nozzle. The?remote control?system “fails to safe,” which means that with any interruption in the air circuit, such as releasing the deadman, the remote controls deactivate the blast machine.

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There are two common types of remote controls used in sandblasting, pneumatic and electric remote controls. Each type has its own advantages and disadvantages, making it important for sandblasters to choose the right type for their specific needs.

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Pneumatic Remote Controls

Pneumatic remote controls are powered by compressed air and operate pneumatically. If the operator is not squeezing the deadman handle, one stream of air travels down the outbound side of the?twinline?and escapes through an opening located under the lever. The normally closed inlet valve remains closed, and the normally open outlet valve remains open.

Pneumatic remote controls are known for their durability and reliability, as they are less prone to malfunctions and can withstand harsh working conditions.

One of the main advantages of pneumatic remote controls is their simplicity. They are easy to operate and require minimal maintenance, making them ideal for beginners or operators who prefer a more straightforward approach to sandblasting. When the?deadman?handle lever is pressed, the opening is sealed, and air in the outbound line returns through the inbound line to open the inlet valve and close the outlet valve. This action pressurizes the blast machine and begins the blasting process. Releasing the handle puts the machine in exhaust mode, which closes the inlet valve, and opens the outlet valve to depressurize the blast machine and stop the blasting.

Pneumatic remote controls are also more cost-effective than electric controls, making them a popular choice for budget-conscious sandblasters.

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However, pneumatic remote controls also have their limitations. They are less precise and customizable compared to electric controls, as they rely on air pressure to control the sandblasting process. Pneumatic controls may also be affected by changes in air pressure or temperature, which can impact the quality of the results. Pneumatic remote controls work best in blasting operations with blast hose lengths less than 100 ft.

Electric Remote Controls

Electric remote controls are powered by electricity and are often preferred for their ease of use and precision. They allow operators to control the sandblasting process with the push of a button, making it easier to adjust settings and monitor progress. Electric remote controls also provide more consistent and accurate results compared to pneumatic controls, as they are not affected by changes in air pressure or temperature.

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One of the main advantages of electric remote controls is their versatility. They can be used in a wide range of sandblasting applications, from small-scale projects to large industrial jobs. Electric remote controls also offer more customization options, allowing operators to program specific settings for different surfaces and materials.

Electric remote controls?are recommended when your blast hose distance reaches 100 feet or greater. Distances 100 feet or greater allow for too much of a delay when using a pneumatically operated remote system due to the amount of time it takes for the air signal to reach the inlet valve and outlet valves. Instead, an electric cord is used in place of the twin line hose to send the signal.

Electric remote controls send an electric signal back to a control panel at the blast pot. The control panel then sends a signal of air to the inlet and outlet valves telling them to open or close. The fact that the control panel is mounted on the blast pot takes away any delay in sending the signal. Electric remote controls are also used in cold environments since pneumatic systems may freeze due to the condensation that builds up within the lines. To prevent damp air from freezing, an antifreeze injector is installed on all electric control panels.

However, electric remote controls also have some drawbacks. They are more expensive than pneumatic controls and require a power source, which may not always be available in remote or outdoor locations. Electric remote controls are also more prone to malfunctions and technical issues, which can lead to downtime and costly repairs.

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Conclusion

Both electric and pneumatic remote controls have their strengths and weaknesses when it comes to abrasive blasting. Electric remote controls offer greater precision and versatility, while pneumatic remote controls are more durable and cost-effective. Sandblasters should consider their specific needs and preferences when choosing between the two types of remote controls to ensure the best results for their projects. Ultimately, the right choice will depend on factors such as budget, location, and the complexity of the blasting job.