Membrane Switch Definition - 5 conditions
The ASTM subcommittee on Membrane Switches defines a membrane switch as: "A momentary switch device in which at least one contact is on, or made of, a flexible substrate"
To be more specific, all of the following conditions or features must be met in order to truly be classified as a membrane switch:
1. Direct (Ohmic) Contact: the poles of the switch must make physical contact, i.e. can not be non-contact type like capacitive, ferrite core, or hall effect.
2. Momentary Action: Upon release, the poles immediately separate as the flexing membrane returns to its original position.
3. Low Voltage Application: A membrane switch is designed to be used in low voltage, DC logic-level-signal, applications.
4. Membrane Layer: A thin pliable layer and carries one pole, both poles or that flexes during switch operation used to short both switch poles together. See figures 2 & 3.
5. Static Layer: Does not flex during switch operation but carries one pole, both poles or used to short both switch poles together. See figures 2 & 3.