Chuchen TechnologyInstructions for using ultrasonic level gauge

I. Overview

Thank you sincerely for choosing our ultrasonic level gauge.Chuchen TechnologyWe are a professional manufacturer of ultrasonic level gauges. Regarding product prices, please feel free to contact customers for discounted quotes, and we offer discounts for larger quantities!

This instrument integrates multiple Z-li technologies and has advantages such as safety, cleanliness, high precision, long service life, stability and reliability, and easy installation and maintenance. It is suitable for various fields such as acid, alkali, salt, anti-corrosion, and high temperature. Meanwhile, it can be achieved through Connect 4-20mA or RS485 (Modbus protocol or other customized protocol) to display meters or various DCS systems to provide real-time liquid level data for industrial automation operation.

2、 Technical indicators

2.1 Technical indicators of two-line ultrasonic level gauge

2.2 Technical specifications of four wire ultrasonic level gauge

Example of Relay Function for Four Wire Ultrasonic Level Gauge

For If it is required to close the relay and start the pump to inject water when the liquid level is below 2 meters, and disconnect the relay to stop the pump when it is above 7 meters, a lower limit alarm relay can be used to achieve this. Set the hysteresis dL=7-2=5 meters, set L=2 meters. In this way, when the liquid level is less than 2 meters, the relay closes and the pump is turned on to inject water; When the liquid level exceeds 7 meters, the relay will disconnect and the pump will stop.

For If the liquid level is 5 meters, if it is required to close the relay and start the pump for drainage when it is higher than 4 meters, and to stop the pump when it is lower than 1 meter, an upper limit relay can be used to achieve this. Set the hysteresis dH=4-1=3 meters, AH=4 meters. In this way, when the liquid level is greater than 4 meters, the relay closes to open the pump for drainage, and when it is less than 1 meter, the pump stops.

The above two examples are both cases where only one pump is used to control two liquid level points using hysteresis. For situations where multiple pumps are used, simply set the control values.

3、 Installation method

In open environments, bracket installation is generally used, and the instrument is fixed with its own locking nut. If installed on a pool or tank, a slightly larger diameter probe should be cut at the installation location（Insert the ultrasonic level gauge probe into a 60mm circular hole and tighten the locking nut from bottom to top. During installation, it is necessary to ensure that the probe surface is perpendicular to the measured liquid level,GCC-There are three installation methods to choose from for the Q ultrasonic level gauge.

4、 Installation precautions

When installing instruments outdoors, it is recommended to install sun visors to extend the service life of the instruments.

Please make sure to tighten or block the waterproof joints at the cable inlet and outlet to prevent water from entering the instrument.

Although the instrument itself is equipped with lightning protection devices, it is recommended to install dedicated lightning protection devices at the inlet and outlet of the instrument when used in areas with frequent lightning strikes.

When the instrument is used in extremely hot and cold places, where the ambient temperature may exceed the working requirements of the instrument, it is recommended to add high-temperature and low-temperature devices around the level gauge.

5、 Troubleshooting

5.1 The distance L displayed on the instrument is not equal to the distance from the probe to the liquid level

This situation indicates that the instrument did not measure the correct liquid level, but instead measured the wrong target object, such as protrusions, steps, beams, extended pipe openings, or blind spots becoming larger. Please display the distance on the instrument panel Search for the target object at location L. If the top liquid level is below the target object, it can be avoided by setting a blind spot (in menu P06); If the top liquid level will submerge the target, it can only be avoided by reducing the reflection echo of the target object, changing the installation position of the probe, tilting the probe appropriately, and adding a waveguide (see 3.4 for details).

5.2 Large fluctuations in liquid level data

If the data bounce is less than 5cm， The problem can be solved by selecting the appropriate reaction speed through menu P05; If the data fluctuation is greater than 5cm, it indicates that there is a large ripple in the power supply and ground air. The solution includes: separately equipping the instrument with a DC24V power supply; Add a 4-20mA isolator; Properly ground the instrument, etc.

5.3 LCD without display

Please check the power supply voltage and startup current of the instrument first. The supply voltage must be greater than 18V， The startup current of the instrument is around 3.5mA. If the startup current is greater than 4mA or less than 2.5mA, the instrument must be returned to the factory for maintenance.

5.4 The instrument cannot measure the liquid level or the first line of the instrument LCD keeps displaying "----"

If this situation occurs, it is necessary to check whether the measurement range exceeds the instrument range (if it exceeds, it needs to be returned to the factory to increase the instrument range); Is the ultrasonic level gauge probe vertical; Whether there is foam or floating objects on the liquid level (hydrostatic wells or wave adding conduits can be used, see 3.4）； If the instrument can display data when the liquid level is high or close, but when the liquid level is low or far, the instrument displays ----, it may be due to insufficient probe power and the probe needs to be replaced at the factory.

5.5 The liquid level of the instrument matches the actual value, but the current output is incorrect

Enter the menu first P09， Fix the output current of the instrument to 20.000mA, and then use an ammeter to check if the output current of the instrument is equal to 20.000mA. If the output is correct, please check the instrument PLC、 Is the 20mA setting of the digital display consistent; If the output is incorrect, the instrument must be returned to the factory for repair.

[Note] If measuring current with a multimeter, it is necessary to confirm whether the battery of the multimeter is sufficient and whether the internal fuse is intact. The battery of the multimeter is insufficient, and the current value will be too high; The current value is 0, it may be due to the internal fuse being blown.