1. What are the basic requirements of ultrasonic level gauge?
When transducers emit ultrasonic pulses, they all have a definite opening angle. From the lower edge of the transducer to the surface of the measured medium, there shall be no obstacles in the area radiated by the emitted ultrasonic beam, so the equipment in the tank should be avoided as much as possible when these devices, such as: ladders, limit switches, heating equipment, brackets, etc. In cases where it cannot be avoided, "false echo learning" must be carried out during debugging. In addition, it should be noted that the ultrasonic beam should not intersect with the feed stream.
2. What should I pay attention to when the appearance of the device?
The highest material level shall not enter the measuring area; It is necessary to adhere to a certain distance from the tank wall from the surface; The external device is designed so that the direction of emission of the transducer is perpendicular to the liquid level as much as possible. The appearance of the installation in the explosion-proof area must comply with the installation regulations of the national explosion-proof hazardous area. The intrinsically safe housing is made of plastic plating. The intrinsically safe appearance can be installed in the occasion with explosion-proof requirements, and the appearance must be connected to the ground.
3. What are the requirements for the location of the device?
When installing GU601 and GU602, pay attention to the surface and container wall at least 200mm
When installing GU603, pay attention to the distance between the surface and the container wall at least 500mm
In the case of conical containers, which have a flat tank top, the optimal orientation of the exterior is in the center of the top of the container, so that the measurement to the bottom of the container is guaranteed
4. What should be paid attention to in the method of ultrasonic level meter device?
Hanger device (GU603 only), moisture-proof, container receiving, stirring, foam, airflow (please refer to the manual for more details)
5. What are the requirements for receiving containers?
The length of the container receive: It is necessary to ensure that the probe extends out of the receiving at least 10mm
In the case of good reflective characteristics of the medium, the receiving length of the container can be slightly longer than that of the transducer when the receiving diameter of the container is large. The table on the right lists the recommended length values for the different diameters received. In this case, it is necessary to have a smooth receiving end, without burrs, and to round the receiving end as much as possible. Otherwise, it is necessary to conduct "hypocritical echo learning". In the case of poor reflective characteristics of the medium, the device method can improve the orientation of the external device, and the receiving device should be equipped with a guide tube (optional) to reduce the influence of reception on the measurement.
6. Why do some environments need to use waveguide devices?
The use of waveguide devices (waveguide tubes or bypass tubes) prevents the influence of obstructions, foam and air eddy currents in the container on the measurement.
Air hole diameter 5... 10mm
7. What is the power supply voltage?
24V DC±10%
8. What are the requirements for the device to connect the cable?
General introduction
The power supply cable can use a general 3-core cable, and the outer diameter of the cable is 5... 9mm to ensure the sealing of the cable inlet. If there is electromagnetic disturbance, it is advisable to use shielded cables. Both ends of the shielded cable should be grounded, and inside the sensor, the shield must be directly connected to the internal ground terminal. It is necessary for the external ground terminal on the housing to connect to the ground.
9. Shielding and wiring of cables
If there is a ground current, it is necessary to ground the shield end of the shielded cable away from the surface through a ceramic capacitor (e.g., 1μF 1500V) to suppress the low-frequency ground current while still preventing high-frequency disturbance of the signal.
10. What is the explosion-proof level of ultrasonic level gauge?
The explosion-proof form of this product is intrinsically safe. Explosion-proof mark: Exia IIB T5.
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