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Using feedback, external time delay, and other sensory circuits, it is possible to build an electromechanical state machine using a cam timer. These are common in washing machines, where the cam timer runs in phases, but also stops and waits for external signals such as a fill level sensor, or a water heating temperature sensor.
The timer may switch equipment on, off, or both, at a preset time or times, after a preset interval, or cyclically. A countdown time switch switches power, usually off, after a preset time. A cyclical timer switches equipment both on and off at preset times over a period, then repeats the cycle; the period is usually 24 hours or 7 days.
Every Chroma has software and interface hardware for an optional polyphonic pressure-sensitive keyboard sensor, but few units have the original factory pressure sensor installed. In 2009 [8] a pressure sensor retrofit kit was produced by a third party. [9] At the time of writing (2015) the kit may still be available.
To provide longer lighting times when required the button may be pressed repeatedly. For this reason any timer should be a retriggerable monostable, i.e. the off delay lasts from the time of the last button press. There may also be a switch, sometimes a key switch, that can turn the lights on indefinitely for tasks such as cleaning.
Service / Mode $05 displays the oxygen sensor monitor screen and the test results gathered about the oxygen sensor. There are ten numbers available for diagnostics: $01 Rich-to-Lean O2 sensor threshold voltage; $02 Lean-to-Rich O2 sensor threshold voltage; $03 Low sensor voltage threshold for switch time measurement
A solid state relay (SSR) is an electronic switching device that switches on or off when an external voltage (AC or DC) is applied across its control terminals. They serve the same function as an electromechanical relay , but solid-state electronics contain no moving parts and have a longer operational lifetime.
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