Non-Contact Infusion Alarm Liquid Level Sensor Water Level Control Switch Interruption Alarm Small Tube Infusion Alarm (3-5mm) Outer Diameter Water Level Induction Alarm

The intelligent non-contact small tube liquid level sensor produced by Trumsense Precision Technology Limited uses advanced signal processing technology and high-speed signal processing chips, specifically for liquid level detection needs such as infusion tubes and industrial small tubes. The intelligent non-contact small tube liquid level sensor can simultaneously output NPN and PNP signals, which can meet the needs of various occasions.

Elite Characteristic:
►Non-contact small tube liquid level sensor, suitable for non-metal small tube outer wall without direct contact with liquid, will not be corroded by corrosive liquids such as strong acid and alkali, and will not be affected by scale or other debris
►Intelligent liquid level reference adjustment and liquid level memory function, liquid level status display mode, can realize multi-point serial connection; can support NPN and PNP simultaneous output )
►Pure electronic circuit structure, non-mechanical working mode, stable performance and long life
►High stability, high sensitivity, strong anti-interference ability, not affected by external electromagnetic interference, special treatment for power frequency interference and common mode interference, to be compatible with most 24V power adapters on the market
►Strong compatibility, penetrating various non-metallic infusion tubes, plastic, glass, ceramic and other small tubes, the diameter of the tube is 3mm ~ 5mm, which meets most of the thin tubes
►NPN and PNP output mode, wide voltage range (can use 2 pieces AAA batteries and external 24V power supply), suitable for connecting various circuits and product applications.


Parameter:



Working Principle:
The intelligent non-contact small tube liquid level sensor uses the sensing capacitance of water to detect the presence of liquid. When there is no liquid approaching the sensor, the sensor has a certain static capacitance to ground due to the distributed capacitance. When the liquid level slowly rises near the inductor, the parasitic capacitance of the liquid will be coupled to this static capacitance, making the capacitance of the inductor larger, and the changed capacitance signal will be input to the control IC for signal conversion, which will change. The electric capacity of the capacitor is converted into a certain amount of change in the electrical signal, and then a certain algorithm is used to detect and judge the degree of the change. When the change exceeds a certain threshold, the liquid level is considered to reach the sensing point.


State description of LED indicator：
A: Battery power supply:
When you press and hold the power button to turn on, the indicator light will flash once;
When you press and hold the power button to shut down, the indicator light will stay on for 1.5 seconds and then turn off;
When the sensor detects liquid, it flashes every 10 seconds;
When the sensor detects no liquid, it flashes twice every 2 seconds;
When the battery is low, stop working and go to sleep, and the indicator lights up every 5 seconds.

B: External power supply:
When you press and hold the power button to turn on, the indicator light will flash once;
When you press and hold the power button to shut down, the indicator light will stay on for 1.5 seconds and then turn off;
When the sensor detects liquid, the indicator light is always on;
When the sensor detects no liquid, it flashes twice every 2 seconds or so


State description of buzzer：
When the external power supply is turned on, it will start automatically and the buzzer will beep.
Long press the power button in the off state to turn on, the buzzer beeps.
In the power-on state, long press the power button to shut down, the buzzer "drops" sounds for 1.5 seconds.
When the sensor detects liquid, the buzzer will not sound;
When the sensor detects no liquid, it will beep twice every 2 seconds.


Instructions of power button:
1. In the power-on state, press and hold the power button for 5 seconds, the buzzer “drops” sounds for 1.5 seconds, and the indicator light turns off after 1.5 seconds.
2. Press and hold the power button for 3 seconds while the power is off, the buzzer will sound a "beep", and the indicator light will flash once and then turn on.
3. When the external power is turned on, it will automatically turn on, there is no need to press the power button. When using the battery alone, you need to press and hold the power button to power on after installing the battery.


Product Detail Description:

This product can sense most liquid, but there are following application condications:

A: Medium viscosity
Normal measurement when dynamic viscosity <10mPaS. 10mPaS 30mPaS, it cannot be measured because a large amount of liquid adheres to the pipe. Note: As the temperature increases, the viscosity decreases, and most high viscosity liquids are more affected by temperature, so pay attention to the liquid temperature when measuring viscosity liquids.

B: Pipeline requirements and installation methods:
1. Hose: outer diameter 3mm-5mm, inner diameter ≥2mm
2. Hard tube: outer diameter 3mm-4.5mm, inner diameter ≥2mm
The pipe or hose should made of non-metallic materials with flat surface, uniform thickness and tight insulation, and good insulation properties; such as glass, plastic, non-absorbent ceramics, acrylic, rubber, silicone and other materials or composite materials.

Installation Method Steps:
1. Fix the sensor to the bracket with screws;
2. Install the battery or connect the external power supply and signal cables according to the figure.
3. When both power sources are available, the external power source is preferred.
4. Install the pipe into the pipe slot of the sensor;
5. Press and hold the power button for about 3 seconds, and the red LED indicator flashes (a "buzzer" beeps), and then release the button; the indicator flashes regardless of the presence or absence of a buzzer.
6. The sensor enters the normal working mode. The effect after installation is shown in following figure:







Application Operation Instruction:
1. Use internal battery for power supply.
     1.1 Install two AAA batteries (note that the positive and negative electrodes of the battery cannot be reversed)
     1.2 Long press the ON / OFF key, the buzzer will beep for about 0.3S, and the red LED will light up at the same               time.
     1.3 The sensor enters working mode. (With buzzer and no buzzer)
     1.4 Adjust the sensor to the appropriate sensitivity, low sensitivity clockwise, high sensitivity counterclockwise.
     1.5 Adjust the optimal sensitivity of the sensor.
     1.6 Shutdown mode: long press ON / OFF 3S to shut down (buzzer sounds about 1S)
     1.7. State description:
        1) No liquid is detected in the pipeline: the buzzer sounds and the LED flashes at the same time.
        2) Liquid is detected in the pipeline: the buzzer is silent, and the LED blinks quickly once every 5 seconds.
        3) Low voltage of battery: LED light is on for about 1S and off for about 5S

Battery installation steps:
1. As shown in following Figure, push the bottom cover in the direction of the arrow:


2. Insert two AA batteries (AAA1.5V) into the battery box; pay attention to the positive and negative directions.


3. As shown in the figure below, align the bottom cover of the battery with the notch on the battery box and close the bottom cover of the battery. Push the battery cover in the direction of the arrow to lock it.




2. Use external DC 24V power supply.
      1. According to the terminal connection mark, the 24V positive pole is connected to "+", and the 24V negative pole (GND) is connected to "-". P1 and P2 are selected as required.
      2. Plug in the external terminal and the sensor will turn on automatically. (You do not need to press the ON / OFF key when using an external power supply)
      3. The sensor enters working mode.
      4. Adjust the sensor to appropriate sensitivity, low sensitivity clockwise, high sensitivity counterclockwise.
      5. Adjust the sensor's best sensitivity.
      6. Shut down mode: unplug the power.
      7. State description:
          1) No liquid is detected in the tube: the buzzer sounds and the LED flashes at the same time, the P1 terminal                is disconnected and the P2 terminal is disconnected.
         2) Liquid is detected in the tube: the buzzer is silent, while the LED is always on, P1 is closed to output 0V, P2               is closed to output 24V.

The small-diameter liquid level measurement plays an important role in the fields of medical infusion, liquid level monitoring in scientific research experiments, wastewater treatment equipment, water purification equipment, and household appliances. As can be seen from the figure below, Loss, in the above areas, will cause great personal and equipment property damage:


Application:
     1. Applicable for medical fluid level alarm.
     2. Suitable for automatic detection and control of liquid level in industrial equipment.
     3. It is suitable for liquid level detection and control of scientific research equipment in various industries.
     4. Suitable for liquid level detection and control of teaching experimental instruments.


Troubleshooting of small tube liquid level sensor:


Product Usage Precautions:
1. Pay attention to keep the level gauge clean, try to prevent corrosion, and avoid violent collision and shock from other objects.
2. When installing outdoors, avoid direct exposure to the main body of the liquid level gauge, keep away from heat sources and pay attention to ventilation. If the ambient temperature exceeds the rated temperature, take appropriate cooling protection measures.
3. When the ambient temperature is too low, you can use an instrument protection box or other protective devices for frost protection, and pay attention to keeping the level gauge dry.
4. The sensor should be regularly maintained and inspected. (The detection time interval is determined by the using unit according to the specific situation).
5. When using battery power, please remove the battery for a long time to prevent leakage.
6. Please use high quality batteries from regular manufacturers.