V . E M I ( E L E C T R O M A G N E T I C I N T E R F E R E N C E )

C. SOURCES OF EMI

The sources of EMI fall into three broad types:

1.Hand-Held Transceivers:

The antenna is usually mounted directly on the unit.These include:

•Citizens band (CB) radios

•“Walkie-talkies”

•Security, fire and police radios

•Cellular phones

•Lap-top computers with phone or fax

•Other personal communication devices

Note: These devices can transmit signals while they are on, even if not in use.

2.Medium-Range Mobile Transceivers:

These include two-way radios used in police cars, fire trucks, ambulances and taxi cabs.The antenna is usually mounted on the outside of the vehicle.

3.Long-Range Transceivers:

These include commercial radio and TV broadcast antenna towers and amateur (HAM) radios. Note: The following are not likely to cause EMI problems:

Lap-top computers (without phone or fax), Cordless phones,TV sets or AM/FM radios, CD or tape players.

D. DISTANCE FROM THE SOURCE

EM energy rapidly becomes more intense as you get closer to the source. For this reason, EMI from hand-held devices is of special concern. (See C.1 above) A person using one of these devices can bring high levels of EM energy very close to your chair without you knowing it.

E. IMMUNITY LEVEL

1.The level of EM energy is measured in volts per meter (V/m). Every power wheelchair can resist EMI up to a certain level.This is called its “immunity level”.

2.The higher the immunity level, the less the risk of EMI. It is believed that a

20 V/m immunity level will protect the power wheelchair user from the more common sources of radio waves.

3.The configurations tested and found to be immune to at least 20 V/m are: Quickie G-424 power wheelchair with a left-hand mounted Penny & Giles Pilot integral controller, Highback contour seat, flip-back armrests, solid flip-up footplate and Gp24 gel cell batteries.

Quickie G-424 power wheelchair with a right-hand mounted QTRONIX remote

V . E M I ( E L E C T R O M A G N E T I C I N T E R F E R E N C E )

joystick system, Highback Contour seat, flip back armrests, solid flip-up footplate and GP24 gel cell batteries.

4.The following specialty import devices have an unknown effect on the immunity level because they have not been tested on the G-424 with the QTRONIX controller:

•Breath Control

•Tri-Switch Head Array

•Heavy Duty Switched Joystick

•Treadle Switch

•Ribbon Switch

•Proximity Head Array

•Zero Touch Switch

•4-Zero Touch Switch

•5-Zero Touch Switch

•Disc Switch

•Proportional Head Control

•Proportional Mini-Joystick/Chin Control

•Buddy Button

•Micro Light

•Star Board

•Wafer Board

•Penta Switch

•Plate Switch

•Soft Switch

•Grasp Switch

•Wobble Switch

Individuals with physical limitations requiring the use of a specialty control input device known not to be immune to 20V/m, or not known, should exercise extra care around known sources of EMI.

There is no way to know the effect on EMI if you add accessories or modify this chair. Any change to your chair may increase the risk of EMI. Parts from other suppliers have unknown EMI properties.

F.REPORT ALL SUSPECTED EMI INCIDENTS

You should promptly report any unintended movement or brake release. Be sure to indicate whether there was a radio wave source near your chair at the time. Contact: Sunrise Medical Customer Service Department at (800) 333-4000.

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Sunrise Medical G-424 Sources of EMI, Distance from the Source, Immunity Level, Report ALL Suspected EMI Incidents
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G-424 specifications

The Sunrise Medical G-424 is a state-of-the-art manual wheelchair that showcases the perfect blend of functionality, comfort, and advanced technology. Designed for users who demand versatility and performance in their mobility solutions, the G-424 stands out due to its impressive features that cater to a wide range of individual needs.

One of the hallmark features of the G-424 is its lightweight frame, constructed from high-strength aluminum, which enhances both durability and portability. Weighing significantly less than traditional wheelchairs, the G-424 allows for easier transport and maneuverability, making it an excellent choice for users who lead an active lifestyle. The folding design adds convenience, enabling the wheelchair to fit comfortably in car trunks or storage spaces.

The G-424 is equipped with ergonomic seating systems that ensure a comfortable experience during prolonged use. The adjustable seat depth and height make it customizable to meet individual comfort requirements, while the breathable upholstery promotes airflow and helps regulate body temperature. This attention to user comfort is essential for enhancing the overall experience and encouraging longer days out and about.

Stability and safety are paramount in the design of the G-424. The wheelchair features a rigid frame that significantly reduces flex during movement, providing a stable base that supports confident navigation. Moreover, the G-424 comes with robust anti-tippers that enhance safety on inclines and declines, giving users peace of mind as they navigate various terrains.

Incorporating advanced technologies, the G-424’s wheel and tire system enhances both performance and usability. The quick-release wheels make it easy to transport and store, while the puncture-resistant tires ensure reliability and independence, reducing maintenance concerns for users. The wheelchair also employs height-adjustable armrests, which can be customized for maximum support.

In terms of aesthetics, the G-424 offers a range of color options and stylish designs, allowing users to express their personality while maintaining a reliable mobility solution. The combination of features and thoughtful engineering makes the Sunrise Medical G-424 not just a wheelchair, but a reliable companion for users seeking independence and life quality enhancement on their daily journeys. Whether it’s for day-to-day errands or recreational activities, the G-424 is built to meet the demands of modern life while prioritizing user comfort and safety.
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