Radar Level Sensor，ultrasonic level sensor，guided wave radar， level transmitter-HCCK

FAQ

Current location> Service> FAQ

The ultrasonic device is working, but the small horn symbol on the screen remains unchanged, indicating a wave loss state.
- 1. The measured distance exceeds the range of the level meter; consider replacing it with a level meter with a larger measurement distance. 2. The measured medium has strong disturbance, vibration, or severe dust; after the measured medium returns to calm, the equipment will automatically resume normal measurement. 3. There are strong interference sources such as frequency converters and motors in the vicinity; check the surrounding environment, do a good job of electromagnetic shielding, do not share the same power supply with frequency converters or motors, and ensure reliable grounding. 4. The probe is not aligned with the measured plane; reinstall the probe perpendicular to the liquid level. 5. There are redundant objects in the measured space, such as support rods, feeding ports, etc.; reselect a suitable installation position to avoid interference objects as much as possible. 6. The liquid level enters the blind zone; raise the installation position of the probe. 7. The measured medium is soft powder; if it is powder, it is not recommended to use this device. 8. The surface of the measured liquid has foam, and within the ultrasonic irradiation range, the foam coverage area exceeds 30%; it is necessary to filter the foam in the water inlet part or place the ultrasonic level meter in a wave guide tube for measurement to avoid the influence of foam.
The signal output is constant, and the instrument measurement value is fixed.
- Restart the ultrasonic level meter. If it still does not work, try to perform 4-20mA calibration to check whether the output changes. Use a multimeter to measure the current in the loop. If there is a change and the output display is correct, it indicates that the connection circuit is normal, but the output of the ultrasonic level meter may be faulty and needs to be returned to the factory for inspection. If the analog calibration also shows no change, replace it with another normal ultrasonic level meter to check the output. If the output is normal, it means the original ultrasonic level meter is faulty. If it is still abnormal, it indicates a problem with the transmission line.
The ultrasonic level meter frequently freezes or restarts automatically during use.
- Check whether there is a problem with the power supply. It requires a 24V DC power supply, and monitor whether the power supply is normal. Detect if there is excessive alternating current in the DC power supply. If so, a 24V isolated power distributor can be added. (Power supply measurement should be carried out with a load). Inspect whether there are large electrical equipment (motors, electric vibrators, frequency converters, large electromagnetic equipment) near the installation environment of the ultrasonic level meter, or whether the wiring of the ultrasonic level meter is parallel to that of large electrical equipment, and separate the wiring. If such a situation exists, the installation location of the ultrasonic level meter should be kept as far away from large electrical equipment as possible.
Fluctuations occur in the ultrasonic level meter during operation.
- 1. Check if there is debris adhering to the probe and clean it. 2. Verify whether the installation position and the length of the connecting pipe comply with the installation requirements of the ultrasonic level meter. 3. Inspect if there are obstacles in the silo. If so, the installation position needs to be changed.
Discrepancy between the ultrasonic level meter display and the secondary instrument.
- 1. Check whether the measuring range of the ultrasonic level meter corresponds to that of the secondary instrument. If not, modify them to be consistent. 2. If the measuring ranges are consistent but the displays do not match, convert the current value of the ultrasonic level meter based on the range and the data displayed by the ultrasonic level meter, and measure whether the current output value of the ultrasonic level meter is consistent with the converted value. If they are consistent, the ultrasonic level meter is not faulty, and it is necessary to check whether the user-side equipment has any problems. If the current measured by the ultrasonic level meter is inconsistent with the converted current, detect whether the power supply is normally around 24VDC. If not, control the power supply of the ultrasonic level meter to be around 24VDC. If the power supply is normal, the ultrasonic level meter needs to be returned to the factory for inspection.
Discrepancy between the ultrasonic level meter display and the actual material level indication.
- 1. Check whether the on-site display of the ultrasonic level meter shows the liquid level value or the distance value. 2. Determine whether the liquid level has entered the blind zone of the ultrasonic level meter. If it enters the blind zone, the value displayed by the ultrasonic level meter may be a false value. 3. Check whether the material surface is flat and free of fluctuations. If the material surface fluctuates significantly or there are obvious material piles in solid materials, it may cause the ultrasonic level meter to measure the echo from the higher or lower position of the material surface. 4. Check whether there are obstacles such as supports, beams, or agitators in the silo, which may cause the echo of the ultrasonic level meter to be a false echo from the obstacles.
Internal failure of the ultrasonic level meter.
- 1. The 4-20mA signal is unstable. This is mostly caused by level fluctuations, which can be addressed by adjusting the installation angle to enhance the effective echo signal or increasing the damping time. 2. The 4-20mA signal is lost. This phenomenon is often caused by incorrect power supply wiring, too low supply voltage, or too high load resistance. Check whether the power supply is reliably connected and if the cable is disconnected. For low voltage or high load resistance, inspect and correct the power supply in a timely manner. 3. The current signal is greater than 22mA or 0mA. This failure is mostly due to damage to electronic components, and the instrument should be replaced promptly or sent to the factory for repair.
Inaccurate measurement data from the ultrasonic level meter itself.
- 1. Check whether there is dust accumulation, scaling, scarring, etc. at the probe of the ultrasonic level meter. If so, clean it in time. 2. Check whether the probe of the ultrasonic level meter is submerged by the material. If yes, raise the installation position. 3. Check whether there is foam on the material surface. If the foam is very thin, the ultrasonic level meter can measure normally. However, when the foam is too thick and highly viscous, large errors or measurement failures may occur. In such working conditions, the ultrasonic level meter is not effective for measurement.
No display after powering on.
- 1. Check whether the equipment supply voltage is consistent with the voltage marked on the nameplate. If they are inconsistent (for example, an ultrasonic level meter with a nameplate marked voltage of 24VDC is connected to 220VAC), or the positive and negative terminals of the 24VDC power supply are reversed, it may cause damage to the ultrasonic level meter, which requires returning to the factory for maintenance. 2. If the power supply is not reversed, use a multimeter to measure whether the voltage is the same as that marked on the nameplate (if possible), and use the milliammeter gear of the multimeter to measure the current of the ultrasonic level meter. 3. The wiring between the LCD screen and the mainboard is loose or disconnected. Check the wiring and reconnect it. 4. If the LCD screen is damaged, return it to the factory for maintenance. 5. The LCD screen does not display due to low temperature, generally caused by the temperature being lower than -20°C. The LCD screen will resume display after the temperature rises.
How to determine if an ultrasonic level meter is normal:
- 1. Carry out on-site inspection: Observe whether the actual on-site working conditions are suitable for the model of the ultrasonic level meter, confirm whether the installation position is correct, and whether the installation environment affects the use of the instrument, etc., to avoid failures after being put into use and affect work efficiency. In addition to the ultrasonic level meter, other instruments should also carry out this work, which is relatively basic. 2. Conduct power-on inspection: After powering on, observe whether the ultrasonic level meter starts normally and displays normally. Many accidents occur, such as instrument malfunctions caused by power supply issues or no power supply at all. 3. Perform connection inspection: Users can use professional instruments to inspect the connections and determine whether the ultrasonic level meter is operating normally. 4. After long-term use, the ultrasonic level meter may have some minor problems. Understanding these methods allows users to solve these minor failures independently, ensuring that small malfunctions do not affect production.
No waveform is displayed on the radar level gauge or an "E" error is reported.
- 1. Antenna-related issues: Clean dirt, water droplets, etc., on the antenna, or address the problem that the horn mouth does not extend out of the connecting pipe. 2. The height of the material tank exceeds the radar's measurement range, causing the radar to fail to detect the actual material level. Try to adjust the measurement range. 3. Take out the radar and point it directly at the wall or bottom to check if it works normally. If it does, the possible reasons are: ① The measured material has foam, preventing the radar from acquiring echo signals; ② The silo bottom has a hopper or arc, causing the radar to fail to acquire echo signals. In such cases, try adding some material and observe. 4. If the above measures do not solve the problem, contact customer service.
The measurement value of the instrument remains unchanged.
- 1. Check the radar echo curve to determine whether the radar measurement represents the actual material level. Interference objects may cause the radar to fail to respond to level changes. In this case, try to create a new false echo filter under the service menu to eliminate interference waves. 2. Restart the radar. If the issue persists, attempt 4-20mA analog output and check for changes. Use an ammeter to measure the loop current. If the output changes and displays correctly, the connection circuit is normal, indicating a potential radar output problem that requires factory inspection. 3. If the analog output remains unchanged, conduct a comprehensive inspection. Try replacing the radar with a functioning unit to observe output. If normal, the original radar is faulty; if not, the transmission line is problematic.
The radar frequently freezes or restarts automatically during operation.
- 1. Check if there is a problem with the power supply. The radar requires 24V DC power supply, and monitor whether the power supply is normal. Detect if there is excessive alternating current in the DC power supply. If so, an inverter or 24V isolated power distributor can be added. (Power supply measurement should be carried out with a load). 2. Inspect whether there are large electrical equipment (motors, electric vibrators, frequency converters, large electromagnetic equipment) near the radar installation environment, or whether the radar wiring is parallel to the wiring of large electrical equipment, and separate the wiring. If such a situation exists, the radar installation location should be kept as far away from large electrical equipment as possible.
The radar shows fluctuations during use.
- 1. Check if there is debris adhering to the antenna and clean it. 2. Verify whether the installation position and the length of the connecting pipe comply with the installation requirements of the radar. 3. Inspect if there are obstacles in the silo. If so, perform false echo learning when the silo is empty.
The radar display does not match the secondary instrument.
- 1. The radar measurement range should correspond to that of the instrument. The range corresponding to the radar current output (4-20) mA is the value of the radar low-level setting minus the high-level setting. 2. Check the display content under the display menu to see whether the radar shows material height or empty height. 3. Check the current output mode in the current output under the service menu: (4-20) mA or (20-4) mA, and modify this item to the required output mode. 4. If the above settings are confirmed to be correct, change the display content under the menu display to current, view the output current value, and connect an ammeter in series with either wire of the radar power supply. After stabilization, check whether the measured current value is consistent with the radar display. If they are consistent, the radar is normal; if not, contact customer service.
The radar display does not match the actual material level indication.
- 1. If the display of the radar is not significantly different from the actual material level, adjust the distance offset under the service menu. 2. If there is a large discrepancy, there may be obstacles in the material tank or silo. In this case, perform false echo learning under the false echo menu of the service menu to avoid interference from obstacles. 3. Check the display content under the display menu to see whether the radar shows material height or empty height.
Internal failure of the radar.
- 1. The 4-20mA signal is unstable. This is mostly caused by level fluctuations. It can be addressed by adjusting the installation angle to enhance the effective echo signal or increasing the damping time. 2. The 4-20mA signal is lost. This phenomenon is often caused by incorrect wiring of the power supply, too low supply voltage, or too high load resistance. Check whether the power supply is reliably connected; inspect if the cable is disconnected or the fuse is blown, and repair in time if issues like cable breakage are found; for low voltage or high load resistance, check and correct the power supply. 3. The current signal is greater than 22mA or 0mA. This failure is mostly due to damage to electronic components, and the instrument should be replaced in a timely manner or sent to the factory for repair.
Inaccurate measurement data of the radar level gauge itself.
- 1. Check whether there is dust accumulation, scaling, scarring, etc. at the probe of the radar level gauge. If so, clean it in time. 2. Check whether the antenna of the radar level gauge is submerged by the material. If yes, raise the installation position. 3. Check whether there is foam on the material surface. For dry foam and wet foam, the radar can measure normally, but when the foam is too thick and highly viscous, large errors or measurement failures may occur. In such working conditions, the radar level gauge may not function effectively for measurement.
No display after the radar is powered on.
- 1. Check whether the equipment supply voltage is 24VDC or if the positive and negative terminals of the power supply are reversed. If 220V voltage is connected, the radar may have been burned out and needs to be returned to the factory for repair. 2. If the power supply is not reversed, use a multimeter to measure the voltage (should be 24VDC) if possible, and use the milliammeter gear of the multimeter to measure the current. The maximum current during the startup of a 26G radar is 22 milliamps. 3. Inspect whether the radar display control screen is firmly installed, and whether the spring pin contacts connected to the radar display control are normal.
How to determine whether a radar level gauge is normal?
- 1. Carry out on-site inspection: Observe whether the actual on-site working conditions are suitable for the model of the radar level gauge, confirm whether the installation position is correct, and whether the installation environment affects the use of the instrument, etc., to avoid failures and impact on use. 2. Conduct power-on inspection: After powering on, observe whether the radar level gauge starts and displays normally. Many accidents occur due to power supply issues or no power supply, causing the radar to restart frequently or the instrument to work abnormally. 3. Perform connection and transmission inspection: Check the data transmitted to the digital display meter, PLC, and DCS. If conditions permit, observe the linearity of the level gauge by connecting corresponding software. Users can also use professional instruments to inspect the connection and determine whether the radar level gauge is operating normally.
How to order?
- In order to recommend you the most suitable radar level sensors and make an accurate quotation, please provide the followinginformation and send it to our sales when you are going to make an inquiry, thanks ! What is your medium? Water, oil or others? Level range: 0-10meters, or others? Output signal: 4-20mA,RS485 or others?
How can I get my sensors?/ What’s the means of transport?
- We main delivery goods by express: DHL, FedEx, UPS,TNT, etc or logistics by indicator.
How is your quality assurance service?
- Our service is free exchange within one month and 12 months quality guarantee.
What is your normal delivery way?
- Goods will be sent by DHL / FEDEX / UPS / EMS / TNT / or other proposed forwarders.
What is your delivery time?
- It is in 6-8 working days since the payment confirmed . If quantity is more than 100pcs /order, it will need extra 3-5 working days .
What payment ways do you accept?
- You can pay us by T/T , PayPal , and West Union .
Could I visit your factory?
- Of course if you need we will help you to visit our factory.
How can I get the quotation?
- Send your inquiry to us by the inquiry from on the right-side or the bottom of this page. Or contact us directly at (Email: sales@hhcck.com), you will get the reply within 12hours, and the quotation will be send to you according to your requirements.
Could you provide me the shortest lead time?
- We have materials in our stock. If you really need, you can tell us and we will try our best to satisfy you.
How is the price?
- As we believe the quality is the most important, we will provide the best quality pressure sensor we can with reasonable price.
How about the quality of the level sensor?
- We have the certification of ISO, CE and ATEX, we could send the certification test of our company to you.
Could I get samples?
- Yes, we have materials in stock to help you to get the samples as soon as we can.
Can you accept ODM & OEM service?
- We professional provide OEM &ODM service for radar level transmitter.
Are you the final manufacturer?
- Yes, We are SENSOR manufacturer and exporter in china with 10+ years experience and with the factory authorized by SGS.