What is a thumbwheel switch?
A Thumbwheel Switch is a setting switch that converts the numeric value selected by turning a disk-shaped part on which numbers are written into a binary, decimal, hexadecimal, or other code using the combination of ON and OFF signals for multiple contact circuits and that outputs the resulting code.
What is Thumbwheel controls?
Definition of thumbwheel : a control for various devices consisting of a partially exposed wheel that can be turned by moving the exposed edge with a finger.
What is BCD switch?
These binary coded decimal thumbwheel switches feature 10 positions, are constructed of gold-plated beryllium copper alloy, and have a front snap-tab mounting with end plates. …
What are the different types of toggle switch?
Toggle Switch Types
- On-On Toggle Switches.
- On-Off Toggle Switches.
- On-Off-On Toggle Switches.
- Momentary Toggle Switches.
- Single Pole Double Throw (SPDT)
- Single Pole Single Throw (SPST)
- Double Pole Double Throw (DPDT)
- Double Pole, Single Throw (DPST)
How does a mercury switch work?
Mercury switches have one or more sets of electrical contacts in a sealed glass envelope that contains a small quantity of mercury. Tilting the switch in the opposite direction moves the mercury away from that set of contacts, breaking that circuit.
How do BCD switches work?
The switches show the number on the face and give the BCD bits shorted in the switch as the number is entered. For instance, if the number displayed is ‘6’, the bits associated with the 2 bit and the 4 bit are shorted giving 24 V on these pins with 0 v on the 1 and 8 bit pins.
Are mercury switches safe?
Toxicity. Since mercury is a toxic heavy metal, devices containing mercury switches must be treated as hazardous waste for disposal. Because it is now RoHS restricted, most modern applications have eliminated it.
What replaced mercury switches?
unidirectional tilt switch
The unidirectional tilt switch is a great alternative to older “mercury switches” in order to avoid the hazardous mercury in applications for safety and compliance standards. They also have much greater accuracy than most other non-mercury switch options.
Where are thumbwheel switch used for?
Thumbwheel switches are commonly used in process controls, testing, instrumentation, and machine controls.
What are the two types of switches?
There are two types of switches, mechanical and electrical. Manual or physical contact is required with mechanical switches.