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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LM1830 Datasheet PDF

There is no problem in driving the LED using AC signal and this method is very useful when it comes to use a loud speaker as the indicator. The tank must be made of metal and it should be properly grounded.

Hi, can this sensor circuit be used to detect diesel fuel? Low liquid level indicator LED. Some time there may be situations when the fluid resistance probe to ground do not match with the 13K internal reference resistor. Your email address will not be published.

Level indicator using external reference resistor. Please refer to the second circuit above. When the probe is not touching the water it equal to an open circuit situation and surely the probe resistance will be many M ohms and it is greater than the R ref 13K. How could I use this circuit to control the Digital input on a microcontroller? For non metal tanks fix a small metal contactor at its bottom level and ground it. You may also like: A method for activating a relay when the liquid level exceeds a predetermined level is shown here.


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

Low liquid level warning audio. The load that is the relay is connected at the collector of Q1. The probe used here can be any metal rod with size and shape of your choice. The load connected through the relay whether pump, lamp, alarm, solenoid valve or anything is driven. The circuit detects the fluid level by comparing the probe to dafasheet resistance with the internal reference resistor R ref. The probe must be placed at the level you want to monitor. 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.

The circuit of a low liquid level indicator with LED is shown above. You have to connect the tweeter between Pin No12 and Vcc through suitable resistance.

Datasheet «LM1830»

The circuit is similar to the first circuit except that the Lm1380 is replaced by a loud speaker and the load current limiting resistor is changed from 1. When the probe to ground resistance goes above the ,m1830 ref the oscillator output is coupled to the base of the internal output transistor making it conducting. External transistor Q1 is connected to the collector of the internal transistor. The oscillators output is directly available at pin 5 and the Rx connects the oscillator output to the probe through the blocking capacitor.


LM (NSC) PDF技术资料下载 LM 供应信息 IC Datasheet 数据表 (8/8 页)

Hi Rohit Pin No 5 is oscillator out put for external reference resistance. You may see the circuit if you are interested. Resistor R3 limits the collector current of the internal transistor while resistor R4 provides protection to the IC from transients.

Atenciosamente… Washington Souza Gomes. The circuit diagram for datasehet above said scheme is shown below.

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

Achei fantastico o site. Leave a Reply Cancel reply Your email address will not be published. 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 dxtasheet employed.

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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. Usage of AC signal for detection prevents electrolysis and this makes the probes long lasting. High liquid level activated switch.