Ultrasonic Products Frequently Asked Questions Answered

Ultrasonic Products Frequently Asked Questions Answered

Our official website：https://kcsensor.com

Questions and answers about supply voltage

Q: How to choose the power supply voltage, and how much is appropriate?

A: What is your usual voltage range? It is more stable according to your usual tune.

Because the smart boards currently on the market are generally powered by 5V, the sensor power used is naturally also 5V.

The power supply on the KUS3000 sensor circuit board is: 12V->5V->3.3V (12V is used for analog amplification and comparison circuit; 5V is used for MCU, sensor, and other digital chips; 3.3V is used for reference voltage).

For other models, the power tree is powerin->3.3->3.0V. The power supply voltage range of our products is 3.3~30V.

Q: I have a 3A power supply, will it break my 500mA circuit?

A: No. A 3A power supply will not force 3A into your circuit. A 3A power supply will supply up to 3A of current. It’s your circuit that decides how much of that current it will actually use.

Q: My device says 5V (DC) 1A. What power supply do I need?

A: You need a power supply that gives 5V DC and has a maximum current of more than 1A.

Q: My circuit needs 9V, can I use my 12V supply?

A: No. If your circuit needs 9V and you connect it to 12V, it’s a good chance it will break.

Q: Can the level sensor be powered by 220VAC power supply?

A: Hello, you need to purchase an AC-DC power adapter separately to connect to the 220V power supply. It can be converted to a voltage of 3.3~30V. You can buy it yourself, or we can provide it at an additional price.

Q: Is the KUS640 battery powered?

A: Hello, KUS640 is not battery-powered, you can use an external battery for power supply. The KUS650 wireless level sensor is powered by a lithium battery.

Q: The power supply voltage of KUS3000 series products is 13~30V, what is the maximum range?

A: Hello, the maximum power supply voltage range of KUS3000 products is 12~30V; it can be converted to 220V by purchasing an additional power adapter. The power adapter can be purchased by yourself, or we can provide it at an additional price.

Q: What is the voltage value between the two terminals of the sensor output when no target is detected?

A: 5V, when there is a target, it is 0V.

Questions and answers about output signals

Q: If there is no output, but battery power is required, can it be realized?

A: Hello, at least one output is required, otherwise the sensor data cannot be obtained. Currently only KUS650 wireless series products powered by batteries are powered by lithium batteries, with 4G/NB/Lora/GPRS outputs, the range can be selected from 0.3m to 30m, and the measured value can be read directly on the display head.

Q: What is UART?

A: Hello, Universal Asynchronous Receiver/Transmitter (Universal Asynchronous Receiver/Transmitter) is usually called UART, which is a serial, asynchronous and full-duplex communication protocol.

Its principle is to transmit each binary bit of the transmission data bit by bit, and the transmission rate is low.

UART has only two signal lines: RX (receiving) and TX (sending), and the data to be transmitted is converted between serial communication and parallel communication.

UART uses TTL level (TTL: Transistor Transistor Logic, transistor-transistor logic level), 0V represents logic low level, and 3.3V/5V represents logic high level.

Due to the high signal voltage of the TTL interface, many connections, and long transmission cables, the anti-interference ability of the circuit is relatively poor, and it is easy to generate electromagnetic interference (EMI).

The transmission distance is generally within 3m.

Currently our KUS550/600/630/640 all support UART output.

Q: Can RS485 and voltage dual output?

A:Hello, yes. If it is RS485 and voltage dual output, you can buy our 4-20mA output products. On the basis of 4-20mA output, connect a resistor to convert it to 1~5V voltage output (voltage output is essentially 4-20mA output). Currently our KUS550/600/630/640/3000 all support 4-20mA output.

Q: Can KUS series products support dual output?

A: Hello, KUS550, 600, 630 supports any combination of RS485 and 4~20mA/NPN/PNP dual output when powered by 12~30V.

(Due to the design of the circuit itself, the 4-20mA output power supply needs to be above 12V) at 3.3~30V, it supports dual output of any combination of RS485 and NPN/PNP.

KUS3000 series products can only have one output. (4~20mA/NPN/PNP/RS485), and cannot do combined output; because KUS3000 series products have 4 pins, while our KUS500/600/630 has 5 pins, Can support dual output.

Q: What is the switch output?

A: Hello, the switch output is a function for the sensor to convert the sensed analog or digital signal into a switch signal, and then output it.

The switching value is a pair of contacts. There are two states between the pair of contacts, either connected or closed, or disconnected or disconnected. The information conveyed by this pair of contacts is a Switch.

Q: What is the difference between NPN and PNP?

A:Hello, both are switch output, but the output connection method is different, because the internal structure is opposite.

NPN is a common anode, that is, the P junctions of two PN junctions are connected as bases, and the other two N junctions are respectively used as collectors and transmitters.

PNP is a common cathode, that is, the N junctions of two PN junctions are connected as bases. The other two P junctions are used as collector and emitter respectively.

NPN means that it is usually a high-level input, and the signal is a low-level output when the signal arrives. PNP means that it is usually a low-level input, and the signal is a high-level output when the signal arrives.

Q: What is the difference between switching value and analog value?

A: Hello, the switch value is used for control, and the analog value is used for regulation. Switching quantity – refers to the output of passive signals, and analog quantity – refers to the output of active signals.

Switching value refers to the acquisition and output of discontinuous signals, including remote control acquisition and remote control output. There are two states, on and off are the most basic functions of electrical appliances.

Generally, the switch quantity device realizes the output of the switch quantity through the internal relay. Analog quantity means that it can take any value within a certain range.

Digital quantities are discrete quantities, not continuously varying quantities. There are generally two types of voltage type and current type.

Compared with the voltage type, the current type is more stable and has stronger anti-interference ability.

Questions and Answers on Low Power Consumption

Q: Can analog 4-20mA be low power consumption?

A: Hello, no, because 4-20mA itself has relatively large power consumption, such as 24V power supply, the power consumption of 4-20m.

A circuit is 0.004X24=0.096W (96mW)—0.020*24=0.48W( 480mW), the circuit property itself is not low power consumption, and our low power consumption products can be powered by 3.3V, and the sleep current is 0.3mA.

At this time, the power consumption is 0.0003X3.3=0.00099W (0.99mW) Less than 1mW is 1% of the 4-20mA power consumption.

Questions and answers about blind spots

Q: Can the blind zone of KUS550 reach 60mm?

A: Hello, yes, the blind zone of KUS550 is 60mm, and the corresponding range is 500mm, and the corresponding blind zone will be smaller if the range is small.

Q: Can the KUS550 achieve a blind zone of 6 cm when the range is 1 meter?

A: Hello, the KUS550 product has a 1-meter range and can achieve a 7-8 cm blind zone. The following table is the blind area of conventional products, if you need a smaller blind area, you can consult and customize.

Q: Can the blind zone of KUS630 reach 300mm?

A:Hello, when the KUS630 blind zone is 300mm, it needs to be customized, and the range is 10 meters.

Questions and answers on the range:

Q: Is there any relationship between range and resolution? How is this relationship defined?

A: Hello, the resolution of our products within the 6.5m range is 0.1mm, and the resolution above 6.5m is 1mm. That is, the larger the range, the lower the resolution.

Because the four-digit hexadecimal number FFFF of the stored range is converted to decimal, the maximum is 65535, and it cannot be stored when it exceeds 6.5535 meters, and a decimal point needs to be added, so the resolution of the product within the range of 6.5m is 0.1mm, above 6.5m The resolution is 1mm.

The resolution of our KUS550/KUS600/KUS3000 is 0.1mm, the resolution of KUS630 is 1mm, and the resolution of KUS640 and KUS650 is defined according to the selected range.

Q: What method is used to adjust the parameters of the liquid level sensor with a range of 1 meter? (For example, the 4-20mA output is adjusted to 0.8 meters)

A: Hello, there is an adjustment terminal, and the user can adjust it according to the instruction manual. For details, refer to Article 4 “Description of Sensor Functions” in the “KUS3000 Ultrasonic Distance Measuring Sensor” manual.

Wireless product KUS650 problem

Q: Which platform is the wireless product KUS650 transferred to?How long can the battery last?

A: Hello, wireless platform link: http://180.76.55.31:7777/login;jsessionid=8D10A3C8E36A9479942F2A0DF4385622 (account: test20221008 password: test220221008)

The battery lasts for 2.5 years if you use it once a day, and you can replace the battery if you need more time.

Q: What is the difference between the wireless output methods (GPRS, 4G, NB, LORA, Bluetooth, Wifi)?

A: Hello, GPRS is universal, but it cannot be used where there is no base station. The transmission speed is 56~115Kbps, and the frequency band is 850/900/1800/1900MHZ.

GPRS can convert the serial communication of industrial RS485/RRS232 serial devices immediately. For GPRS wireless network communication.

Built-in TCP/IP protocol transparent transmission, can be used for long-distance communication or control.

NB, LORA requires a gateway (a gateway is a device that connects two network segments using different protocols). The frequency band below 1GHz used by NB-IoT is authorized by 2113, and charges are required.

Generally, the communication distance of NB-IoT is 15km. LoRa works in the unlicensed frequency band below 1GHz, and there is no need to pay extra for the application, and the coverage range is 5 kilometers.

4G mainly has fast transmission speed, but the coverage is short, so relatively more base stations are needed.

The Bluetooth data speed is 1Mb/s, the transmission distance is about 10 meters, and it supports point-to-point and point-to-multipoint communication.

Wifi is also a short-range wireless technology. It has many frequency bands, including 2G, 4G, and 5G. Its security is worse than Bluetooth, and its coverage is about 90 meters.

Q: Are there any foreign customers who have used your NB?

A: Hello, yes. Customer local support is available.

Q: What is the KUS650 antenna?

A: This antenna is responsible for sending and receiving signals, and the signals can be sent for 5 kilometers.

Q: Does KUS650 have an alarm function?

A: The KUS650 platform has an alarm function.

Q: Does the KUS650 provide a fully energy autonomous solution with batteries and solar panels? When customers do not have access to power through the grid.

A: Yes, the replacement battery is a rechargeable lithium battery, and then adding solar panels and MPPT modules is enough.

Q: Can the signal transmitted wirelessly only use special software? Can it communicate with the DCS system?

A: Yes, as long as your DCS has a wireless interface, you can find a few DCS modules on Taobao. There are DCS modules from different manufacturers, the ones with wireless access, domestic Hollysys, Zhejiang University Central Control, and imported ones. Siemens, it is best to have a model, ask them if they can be connected, if possible, we will make a connection, make a list of connections, and recommend customers to use these connections in the future.

Q: What is the working principle of the wireless ultrasonic liquid level sensor?

A: Wireless ultrasonic liquid level sensor (wireless water level sensor) includes three parts: ultrasonic level sensor, wireless transceiver system, and level host.

It consists of ultrasonic liquid level sensor-power converter, encoder, modulation circuit, high-frequency amplifier circuit, frequency conversion circuit, demodulation circuit, level digital display and antenna.

The signal of level measurement is coded and transmitted by radio waves, received, counted and displayed.

Its transmission and reception adopt short-wave frequency and coaxial ground network antenna, and the transmitted signal wave can be reflected and transmitted to the distant place through the high-altitude ionosphere, so as to achieve the purpose of long-distance measurement of material level.

The problem of protection level

Q: What is the protection level of your products?

A: KUS3000 is IP65, KUS550/600/630 is IP68; KUS640/650 display is IP65;

Protection class (IPXX)

Dustproof level (the first X indicates)

0: no protection

1: Prevent the intrusion of large solids

2: Prevent the intrusion of medium-sized solids

3: Prevent the intrusion of small solids

4: Prevent the entry of solid objects larger than 1mm

5: Prevent harmful dust accumulation

6: Completely prevent dust from entering

Waterproof level (the second X indicates)

0: no protection

1: Water droplets dripping into the shell has no effect

2: When the shell is tilted to 15 degrees, water drops will not affect the shell

3: Water or rain has no effect on the shell from a 60-degree corner

4: There is no harm to the liquid splashed from any direction to the shell

5: Rinse with water without any harm

6: Can be used in the cabin environment

7: It can withstand water immersion in a short time (1m)

8: Immersed in water for a long time under a certain pressure

Corrosion problem

Q: What is the difference between the KUS630 white and black models?

A: KUS630B white model and KUS630 black model are both corrosion-resistant, but the corrosion-resistant time is different; the white model is suitable for full-corrosion acid and alkali-resistant harsh environments, and the Teflon material makes the product itself difficult to process. We need to control the end face within The thickness of 0.15mm can guarantee the acoustic effect.

Stress problem

Q: What is the pressure resistance of KUS3000 when it is working?

A: M18 works under normal pressure and does not have the characteristics of sealing and pressure resistance. The withstand voltage characteristics of other KUS products are as follows:

Signal definition problem

Q: How is your signal defined? The higher the material level, the greater the current value? Or is it free to define?

A: Hello, the product signal definition is shown in the table below. The higher the default material level, the greater the current value.

You can inform us of your needs before purchasing, or you can define them yourself by referring to the manual later. Please see the figure below for details:

KUS3000 series pin definition

KUS550/600/630 series analog (485/4-20mA) output pin definition

KUS550/600/630 series digital (NPN/PNP) output pin definition

Installation problem

Q: Can KUS630 be installed in DN80 holes? Are the KUS series products easy to install?

A: Hello, the thread of KUS630B is 27X2 thread, the external thread size is m76x2, there are terminals, and flanges can be used (flanges are parts connected to each other between shafts, used for connection between pipe ends; also useful Flange on the inlet and outlet of the equipment, used for the connection between two equipment.) or bracket installation.

Flange installation (KUS630)

Bracket installation (KUS550)

Q: What are the main points of using the ultrasonic liquid level sensor?

A:

1. Adjust the height of the ultrasonic sensor from the liquid surface. If it is too far away, the signal received by the probe is too weak; if it is too close, it will enter the blind area of the probe and cannot be distinguished.
2. Ensure that the surface of the probe is perpendicular to the liquid surface to be measured. At the same time, ensure that there are no obstacles in the area radiated by the ultrasonic beam of the probe, and avoid ladders, limit switches, and pipes in the tank. Normally, the transmitter’s diodes will blink, and a rattling sound can be heard near the sensor when an echo is received.
3. The anti-electromagnetic interference performance of ultrasonic waves is not strong, and nearby electrical equipment can easily affect it. The signal line should have an independent threading tube, away from the power line and lighting line. Ensure that the signal shielding is good, the threading pipe should use conductive steel pipe, and the shielding layer should be grounded at a single point to avoid the potential difference of the circuit from interfering with the instrument.
4. In order to prevent poor contact of the signal lines, try not to leave joints in the middle of the signal lines, and there should be no looseness at the crimping of the terminals, otherwise the contact resistance will be large. If there must be joints, welding is required to reduce hidden dangers.
5. Moisture on the signal line, especially the connector, will also cause signal disturbance, so the signal line should be kept dry. When the signal line must go through the cable trench, it needs to be laid on the cable trench support.

Field Setup Questions

Q: How to set the water level when the ultrasonic level sensor is working? Is it ok to calibrate it?

A: Hello, it is best to confirm the water level and depth to be measured when purchasing. We will set it when we leave the factory, or you can set it on site. For details, refer to the product manual.

Q: How to set the alarm water level? Is it okay to connect the relay? How to set the liquid level point?

A: Hello, just let us know the settings when purchasing. It is enough to connect the relay to select the switch output, and the liquid level point can be set by us before purchase.

Q: How do you check the liquid level?

A: Hello, you can see the liquid level by connecting the serial port of the computer with the provided Modbus Poll software.

Q: Is the liquid level setting set on the computer?

A: Hello, yes. You can inform us of your needs before leaving the factory to set up, or you can connect to the serial port of the computer through the provided Modbus Poll software to set up.

Q: How many wires are your products made of?

A: Hello, our products are four-wire system. Ultrasonic liquid level sensor can adopt two-wire system, three-wire system or four-wire system technology, two-wire system: power supply and signal output are shared; three-wire system: power supply circuit and signal output circuit are independent, when using DC 24v power supply, you can use one 3-core cable, the power supply negative terminal and the signal output negative terminal share one core wire; the four-wire system is: when using AC 220v power supply, or when using DC 24v power supply, the power supply circuit and signal output circuit are required to be completely isolated, should be Use a 4-conductor cable. DC or AC power supply, with 4~20mADC, high and low switch output.

Comprehensive question and answer

Q: 1) How to choose PNP or NPN

2) How to choose output type NO or NC

3) How to set up, whether it is possible to save the settings when the power is off

A:  

1. PNP and NPN are just different in wiring, but the two are the same if the switch signal is needed, NPN output is low level, PNP output is high level.
2. NO is normally open when not energized, and closed after energized. NC is normally closed when it is not powered on, and it is disconnected when it is powered on. Just choose according to your needs.
3. The settings are set in the 8 working state setting instructions after the sixth page of the manual, indicating that the requirements can be set during production, and the settings will take effect immediately after the setting is completed, and the settings will be saved when the power is turned off.

Q: What is the general collection frequency and upload frequency of the wireless product KUS650?

A:  Hello, according to your needs and site conditions, the collection frequency and upload frequency can be set according to the instructions in the manual.

The steps to set the collection frequency are as follows:

Press the “M” key in the first step of the measurement state, and “-COd-” is displayed 

The second step is to press the “M” key to confirm, and use the up and down keys to enter the operation code 2122 

The third step is to press the “M” key to confirm, as shown in the figure 

Finally, press the “M” key to confirm, and use the up and down keys to enter your collection time, in seconds 

The upload frequency setting steps are as follows:Press the “M” key in the first step of the measurement state, and “-COd-” is displayed 

The second step is to press the “M” key to confirm, and use the up and down keys to enter the operation code 2121 

The third step is to press the “M” key to confirm, as shown in the figure 

Finally, press the “M” key to confirm, and use the up and down keys to input your upload time in minutes

Q: My display is installed in the cabinet, and it also needs to provide the control cabinet with signal and alarm functions, can it be realized?

A:  Hello, it can be achieved. KUS640 can display and give signals and alarm functions, just connect one terminal to one end of the line.

KUS640 can output one RS485 and one switch signal at the same time.

Specific reference manual “KUS640 Intelligent Ultrasonic Liquid Level Meter Manual”

Q: What size thread is it?

A:  Hello, KUS550/600/630 provides 1 inch standard thread.

Q: What other features do KUS550, 600, and 630 have besides the different ranges?

A:  Hello, 550, 620, and 630 are waterproof because they are sealed with glue and have a sealing ring. 550 and 600 are glued and are suitable for oily scenes.

Q: Does the product need to be calibrated again in the field?

A:  Hello, the product has been calibrated when it leaves the factory and does not need to be calibrated again.

Q: Please explain the four-wire system.

A:  The four-wire system is: when using AC 220v power supply, or when using DC 24v power supply and requiring the power supply circuit to be completely isolated from the signal output circuit, a 4-core cable should be used.

Q: Please explain the sensitivity.

A:  Sensitivity refers to the ratio of the peak-to-peak value of the echo signal voltage output after the ultrasonic echo is converted by the probe to the peak-to-peak value of the driving pulse voltage applied to the probe. Sensitivity is a measure of the mutual conversion efficiency of ultrasonic probe electrical energy and acoustic energy.

Q: Please explain the operating frequency.

A: The working frequency of the ultrasonic level sensor probe is determined by the resonance frequency of the piezoelectric ceramic, that is, the frequency of the ultrasonic waves emitted by the probe. The ultrasonic liquid level sensor probe works at this frequency to output the largest energy and the farthest propagation distance.

Q: Please explain the frequency response.

A: The frequency response of the ultrasonic level sensor probe refers to a reflective object, the frequency characteristics of the echo signal received by the probe, the frequency spectrum of the ultrasonic level sensor probe can be measured by a frequency analyzer, so as to obtain the center frequency, bandwidth, etc. parameter.

Q: What is the quality factor Q?

A: The quality factor Q of the ultrasonic level sensor probe is determined by the quality factor of the circuit part and the quality factor of the mechanical part.

Q: What is the impedance characteristic?

A:  Due to the characteristics of the ultrasonic level sensor probe, it is required to achieve impedance matching with the driving voltage, which has reached the most ideal driving energy and echo receiving signal.

Q: Can all your liquid level sensors realize dual switch output?

A:  M18 is not acceptable, other probes are acceptable.

Q: Can it be used in a dark environment?

A:  Unlike proximity sensors that use light or cameras, dark environments do not affect the detection capabilities of ultrasonic sensors.

Q: Is it affected by the color or transparency of the object?

A: Ultrasonic sensors reflect sound off objects, so color or transparency will not affect the sensor readings.

Q: How does the ultrasonic sensor measure the liquid level of urban garbage cans?

A: Specifically, the urban smart waste treatment application works by placing ultrasonic sensors on the lid of each trash can for waste level measurement. The ultrasonic sensor used does not consume a lot of power, and the pre-installed battery lasts for 10 years. Highly reliable, robust and detector-insensitive, the bin volume is always reliably detected.

Q: What are the advantages of using ultrasonic sensors in waste disposal?

A: The cost is low, 20 sensors can be used in the same environment at the same time, reliable proximity distance information, and double as a rangefinder (still reporting distance measurement information through the serial port), the circuit board is equipped with assembly holes, and the measurement cycle is fast.

Very low power consumption makes them ideal for multi-sensor operation or battery-powered systems.

The output allows the user to obtain reliable proximity information at any time when the processor is released, serial data, 0 ~ Vcc, baud rate 9600 81N, the user can choose any output, and can be triggered internally or externally.

The summary is the following points:

1. Small size and low cost solution
2. High resolution up to 1mm
3. Measurable distance up to 5 meters
4. A variety of output methods, including pulse width, analog voltage, serial port
5. Low power consumption is suitable for battery-powered systems, with only 2.5mA current for 3.3V power supply
6. Anti-noise
7. There are compensations for the target and working voltage of the size change.

Q: What are the characteristics of the waterproof ultrasonic liquid level sensor?

A:  The circuit design starts from the power supply part and selects high-quality power modules. The components are imported with high stability and reliability, which can completely replace the same type of imported instruments from abroad. It can be customized to measure solids, such as solids with powdery fine particles.

The professional sound wave intelligent technology software can perform intelligent echo analysis without any debugging or other special steps, and has the functions of dynamic thinking and dynamic analysis. The accuracy of the instrument is greatly improved, the liquid level accuracy reaches 0.5%, and it can resist various interference waves.

Low failure rate. The instrument provides various installation methods, and the user can completely calibrate the instrument through the manual.

The input and output lines of the instrument have lightning protection, overcurrent and overvoltage protection.

Q: What is the difference between short wave and wavelength wave?

A: Frequency: The number of times an object vibrates per second.

1. The frequency is different

• Shortwave: Radio waves with a frequency of 3 to 30MHz;
• Medium wave: Radio waves with a frequency of 300kHz to 3MHz;
• Long wave: (Including super long wave) frequency below 300kHz.

2. Different wavelengths

3MHz corresponds to a wavelength of 100m; 30MHz corresponds to a wavelength of 10m;

Medium wave wavelength is 3000-2000 meters;

The long wave wavelength is between 1000 and 10000.

Q: Will the data be cleared after the sensor is powered off?

A:  No, we have all the data backed up.

Troubleshooting of KUS550 products

Q: Can the 550 measure oil level? Oil freezes at low temperatures; can it be measured both before and after condensation?

A: Yes, as long as there is no condensation attached to the probe, pay attention to splashing. The probe itself will vibrate during measurement.

If the splash is not serious and the oil stain adhesion is not strong, the probe will knock off the oil stain when it vibrates.

Q: How long does it take for KUS550 to read when it is powered on?

A: By default, KUS550 needs to have 8 effective detection values before it can output. If the default detection frequency is used, the default period of 8 detection values is 200ms, plus the time from power on to stabilization for about 1 second, it is also That is to say, in theory, the correct result should be obtained within 2 seconds.

Q: How does the serial port trigger to start collecting?

A: Send the calling code and then send instructions.

Ultrasonic liquid level sensor inquiry must ask

Capacitive liquid level sensor

Introduction: Capacitive liquid level sensor

Support 0~3.3V/4-20mA/RS485 modbus/dual switch output

Low power consumption

Can be applied to the Internet of Things

Q: Can the capacitive liquid level sensor be battery powered? What is the range?

A: Hello, our capacitive liquid level sensor needs to be powered by an external battery, that is, install the battery yourself; the range it measures is related to the medium, some mediums can measure up to 3 meters, some can’t, only 1.4 meters, because Capacitive liquid level sensors are measured by contact, and the medium of the measurement environment has a great influence on the measurement results.

Q: What is the default installation thread size of the capacitive liquid level sensor?

A: Hello, the default installation thread of the capacitive liquid level sensor is M24*2.

Q: What is the material of your capacitive liquid level sensor?

A: Hello, our capacitive housing is made of Teflon and PFA. It is suitable for level measurement of high-temperature and high-pressure containers, and the measured value is not affected by the temperature and specific gravity of the measured liquid, the shape and pressure of the container. It is especially suitable for the measurement of strong corrosive liquids such as acids and alkalis.

Capacitive liquid level sensor inquiry must ask

External liquid level sensor

Q: Can two sensors of KUM2500A be connected to one GPS tracker?

Answer: Yes.

Q: What are the characteristics of the externally mounted liquid level sensor?

A: When measuring the externally attached ultrasonic liquid level sensor, the ultrasonic probe is installed directly below the outer wall (bottom) of the measured container, no need to open holes, easy to install, and does not affect on-site production. Accurate measurement of toxic substances, various pure liquids.

The probe is external, no need to open a hole in the measured container, and truly realizes non-contact measurement.

It is suitable for accurate measurement of the liquid level of toxic, volatile, flammable, explosive, strong pressure, strong corrosive and other liquid media in various closed containers.

Measurement. The instrument has no mechanical moving parts and has a long service life. No corrosion, no pollution, wide use area.

Q: What is the general wall thickness of the externally attached type?

A: According to our laboratory test, the thickest wall thickness is 12mm, the general oil tank wall thickness is 7.8mm, and the thicker one is about 10mm

Q: What is the appropriate wall thickness for the externally mounted ultrasonic flowmeter?

A: Ultrasonic externally mounted flowmeter: the first thing to consider is the pipe diameter, pipe material, medium, and finally the wall thickness.

The wall thickness of the copper pipe shall not exceed 10mm. Carbon steel and PVC, the diameter within two meters can be detected, and the wall thickness does not exceed 20mm.

Note: Pay attention to confirm whether to buy a debugging tool when purchasing an externally attached liquid level sensor.

If there is no debugging tool, it must be connected to the serial port of the computer to view the data. If there is a tool, the data can be seen intuitively. It is enough to use this one in batches later.

(It is mainly used to confirm the installation point of the probe, one end is connected to the probe, and the other end is connected to the power supply.)

Q: I am testing this oil level sensor today. After confirming that the connection is correct, the probe has not been connected to the container yet, and there is no data output from the serial port after power on. Is this normal?

A: You can take some photos and videos to see how it is installed and wired.

A: 485 blue positive yellow negative, power red positive black negative.

A: A measuring container should be placed on the probe, otherwise there will be no output. You can use a pulsating water bottle to test first, that is, a water bottle with a larger cap, which must be coated with coupling agent.

Q: It should be okay to use a water glass.

A: It’s too thick. You’d better find a drink bottle.

I used a pot, coated with couplant, now I have

A: When testing, just put the water bottle directly on the probe, and you can use the bracket first

Q: *XD,535K,05,2250,0100,0000,2250,0209#, the liquid level is 225mm. pretty accurate

Can I modify the post-work mode here, because our equipment is powered by batteries, and it consumes too much for me to wait for 10S. I checked that the 12V power supply standby is almost 30mA. Can I modify it later to after I send the query command , the liquid level sensor will respond to me immediately, but it usually does not output?

A: The protocol you have configured is actively reported and does not need to be inquired; it takes 40 seconds to output a stable liquid level after power-on and start-up, and one output is 10 seconds in normal operation

Q: It is equivalent to 40S for initialization. It can be understood in this way. When I tested just now, it seems that the output is 10S.

A: You need to stabilize it at the beginning of the boot, and then it will be 10 seconds

Q: Because we have a relatively large amount of work, we work in some remote places, such as substations and industrial and mining enterprises. If the battery is consumed too quickly, it will be too much work to go to the site to replace the battery.

A: Yes, I will change it to a passive query protocol for you later. If you do not query, you will not send it, and you will send it after querying; because most of our customers use it on the car, the default is the active protocol. If you need it, send it to you. passive protocol.

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