DLS5821 czujnik poziomu cieczy odpowiednik LM1830N
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Description
The DLS5821 is a digital equivalent of an analogue circuit LM1830N from NATIONAL SEMICONDUCTOR.
The structure contains all the necessary blocks that perform the function of a digital liquid-conducting sensor such as water, damp material such as earth for flowers.
It can work in option without hysteresis (two electrodes) or with hysteresis (three electrodes). No liquid-water or damp detection (active low) is signaled after 15 seconds at OUT1 output of the system. Can be used to signal lack of liquid or to block heaters. Second OUT2 - active low status - controls the external liquid-water dispensing system (valve or relay).
WARNING ! Maximum output current OUT1 and OUT2 <20mA. Variable polarization prevents electrolysis of the probe electrodes. The sensitivity of the detectors depends on the liquid and the distance from the transmitter electrode to two resistors. One for each detector. Sample values in the figure below.
Description of the system outputs:
1.HIST-- pin to VCC = without hysteresis mode, Pin to = GND mode with hysteresis.
2.S1 -- Input of the first detector (long electrode).
3.S2 -- Input of second detector (short electrode).
4.GND.
5.SOUT -- Generator output to transmit probe (frequency approx. 1kHz).
6.OUT2 -- Water valve or relay control output.
7.OUT1 -- Control output signaling the lack of liquid-water or the blockade of heaters.
8.VCC -- Power supply + 5V
This system is used in new developments of convection ovens in steam generators. It can be used to control water with a stable mirror or to boil water with a turbulent mirror. It can also be used wherever there is a need to maintain a constant level of liquid-water (hot water boilers, steam generators, dental washers and many others.) In systems that maintain constant soil moisture (flowers and vegetables). WARNING ! Does not work: with oils, distilled water, pure alcohol and dry loose materials.
Datasheet: DLS5821.pdf