The GR150 is a normally open switch that closes when
properly placed near a magnetic source.
It consists of two magnetic members hermetically sealed in a glass
capsule, switching takes place in an inert environment. The small size and high
magnetic sensitivity makes the GR150 ideal for use in hearing aids, heart
pacemakers, pill cams, cell phones and similar electronic devices. Hearing aids use the switch to automatically
switch the hearing aid to a mode (T-coil) that gives better performance when
the end customer is using a telephone (which has a low-grade ceramic magnet
located in the handset). The smaller
size of the GR150 allows engineers more flexibility in the mechanical design of
miniature electronic devices. The availability of very tight ampere turn (AT)
ranges allow the design engineer better control of the magnetic variables in
his design. The magnetic sensitivity of
reed switches is measured in Ampere Turns (AT) in a specified test coil. Unlike
some other magnetic sensors which have a power drain while in their off state,
the GR150 consumes no power in the off state. The GR150 is just 3.7 mm in
length - the next largest magnetic reed switch available is approximately 10
percent longer. Designs incorporating
subminiature reed switches benefit substantially from a 10 percent reduction in
switch body length. Typical subminiature
magnetic reed switches have a substantial spread in ampere turns (AT). As produced subminiature reed switches
normally have a sensitivity range of 2 to 30AT.
The unique GR150 manufacturing process is capable of an 80% process
yield in a narrow 2AT band. This would
mean that our manufacturing process is capable of giving us an 80 percent yield
in an AT range of 3 / 4AT.
Determining the quantities and location of sensors in an Internet of Things application requires a thorough problem statement and a clear vision of success, an expert will tell engineers at the upcoming Design & Manufacturing Show in Minneapolis.
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