LM Fluid Detector. The is a monolithic bipolar integrated circuit designed for use in fluid detection systems The circuit is ideal for detecting the presence. LM datasheet, LM circuit, LM data sheet: NSC – Fluid Detector, alldatasheet, datasheet, Datasheet search site for Electronic Components and. LM Datasheet, LM PDF, LM Data sheet, LM manual, LM pdf, LM, datenblatt, Electronics LM, alldatasheet, free, datasheet.

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Hi Challa it is meant for normal water, hence can be used for our domestic use to control over head tank water level.

LM datasheet & applicatoin notes – Datasheet Archive

There is no problem in driving the LED using AC signal and this method is very useful when it comes to use datasheer loud speaker as the indicator. The load that is the relay is connected at the collector of Q1. You may also like: Leave a Reply Cancel reply Your email address will not be published.

Hi, can this sensor circuit be used to detect diesel fuel? Low liquid level warning audio. The circuit is lm180 to the first circuit except that the LED is replaced by a loud speaker and the load current limiting resistor is changed from 1. Level indicator using external reference resistor. The circuit of a low liquid level indicator with LED is shown above.

(PDF) LM1830 Datasheet download

How could I use this circuit to control the Digital input on a microcontroller? Please refer to the second circuit above. You may see the circuit if you are interested. The probe used here can be any metal rod with size and shape of your choice.

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High liquid level activated switch. The probe must be placed at the level you want to monitor. Hi Rohit Pin No 5 dataseet oscillator out put for external reference resistance. Capacitor Cb couples the oscillator output to the probe and it ensures that no DC signal is applied to the probe.

The circuit detects the fluid level by comparing the probe to ground resistance with the internal reference resistor R ref. Resistor R3 limits the collector current of the internal transistor while resistor R4 provides protection to the IC from transients.

Manufactured by National Semiconductors, the LM l1m830 detect the presence or absence of polar fluids. Pin 9 of the IC can be used to solve this problem.

Datasheet «LM1830»

The internal transistor will be switched ON and Q1 whose base is connected to the collector of the internal transistor will be in OFF condition keeping the relay inactive. The load connected through the relay whether pump, lamp, alarm, solenoid valve or anything is driven.

Previous post Next post. Capacitor Ct sets the frequency of the internal oscillator. The circuit diagram for the above said scheme is shown below.

Hai, Can it be used for Water level indicator in a Over head Tank. External transistor Q1 is connected to the collector of the internal transistor.

The LED connected to the collector between pin 12 and Vcc is driven. DC voltage is required for driving the relay and AC voltage cannot be used here just like what we did in the case of LED and speaker.

Low liquid level indicator LED. Atenciosamente… Washington Souza Gomes. When the probe to ground resistance goes above the R ref the oscillator output is coupled to the base of the internal output transistor making it conducting. Achei fantastico o site. You have to connect the tweeter between Pin No12 and Vcc through suitable resistance. The tank must be made of metal and it should be properly grounded.


Some time there may be situations when the fluid resistance probe to ground do not match with the 13K internal reference resistor. In such cases there is option to avoid the internal reference resistor and an external reference resistor of your choice Rx in the circuit can be employed. For non metal tanks fix a small metal contactor at its bottom level and ground it. Loud speakers can be driven only by using AC signals and a DC signal will not produce any datasheef out of the speaker.

A capacitor connected from this pin to ground will keep the internal output transistor steadily ON whenever the probe resistance goes higher than the reference resistor. Usage of Datasheeg signal for detection prevents electrolysis and this makes the probes long lasting. The oscillators output is directly available at pin 5 and the Rx connects the oscillator output to the probe through the blocking capacitor. When the reverse scenario occurs fluid level touches the probe the internal transistor is switched OFF and this in turn makes the transistor Q1 ON resulting in the activation.

The circuit diagram of a liquid level indicator using loud speaker at its output is shown below.

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