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Timer and Counter Modules - del90002U1 CD4541 is a Timer with Long Duration Ability. This timer is started by a low pulse from earlier circuit, when the temperature goes above setpoint, a low state is at U2A inputs, this starts the timer. The timer output goes high after a preset time. U2C-D Flip flop is power on reset via cap C7. Even a manual 'reset' is used if required. This alarm toggle is 'set' when The temperature remains high even after the preset time period of U1.The 74C926 is used here as a four digit counter, The transitions of temperature from earlier circuit, that is the number of times the Process value goes above the Setpoint is recorded in this. A Display switch is given to save power. A reset pushbutton can bring the counter to zero. To view the circuit below, Click the Link of PNG or PDF and view the Circuit, PNG can be Scrolled with Drag-Drop Left-Click-Mouse and PDF can be Viewed-Zoomed in the Browsers with Acrobat plugin. The Javascript and Images must be enabled in your Browser. |
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| Timer and Counter Modules - del90002 |
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More Information :40MHz Frequency Counter ModuleFairchild 74C926 Long Duration Relay, up to 20 hours |