DLM-550 series ultrasonic level gauge

NegotiableUpdate on 05/14

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Nature of the Manufacturer: Producers

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Overview

The microcontroller inside the DLM-550 series ultrasonic level gauge junction box generates ultrasonic waves of a certain frequency. After being driven and amplified, the ultrasonic waves are emitted vertically from the surface of the object by the ultrasonic probe. When the ultrasonic waves come into contact with the object surface, they are reflected back to the ultrasonic probe. After the reflected waveform is amplified by the circuit, a signal is generated to the microcontroller.

Product Details

Introduction to Ultrasonic Level Gauge

DLM-550 series ultrasonic level gaugelevel meter

Ultrasonic level gauge is developed based on ultrasonic ranging technology. The microcontroller inside the junction box of the level gauge generates ultrasonic waves of a certain frequency, which are driven and amplified. The ultrasonic waves are emitted vertically from the surface of the object by the ultrasonic probe. When the ultrasonic waves contact the object surface, they are reflected back to the ultrasonic probe. After the reflected waveform is amplified by the circuit, a signal is generated to the microcontroller. At a certain temperature, the wave velocity of ultrasound is a certain value, so the microcontroller only needs to calculate the reciprocating time of the wave and obtain the height of the object according to the formula S=C * T/2.Working principle of ultrasonic level gauge

The working principle of the DLM550 integrated ultrasonic level gauge is that the transducer (probe) emits ultrasonic pulses that are reflected back from the surface of the measured medium. Some of the reflected echoes are received by the same transducer and converted into electrical signals. Ultrasonic pulses propagate at the speed of sound waves, and the time interval required from emission to reception of ultrasonic echo pulses is proportional to the distance from the transducer to the surface of the measured medium. The relationship between the distance value S, the sound velocity C, and the transmission T can be expressed by the formula: S=C × T/2.

Due to the certain width of the emitted ultrasonic pulses, the reflected waves in a small area close to the transducer overlap with the emitted waves, making it difficult to identify and measure their distance values. This area is called the measurement blind spot. The size of the blind spot is related to the model of the ultrasonic level gauge.

Main technical parameters of ultrasonic level gauge

DLM-550 series ultrasonic level gaugelevel meter

	DLM551	DLM552	DLM553
application	Liquid level measurement in various industrial fields, especially in the water treatment industry	Liquid level measurement in various industrial fields, especially in the water treatment industry	Liquid level measurement in various industrial fields
measurement range	Liquid: 0.25 4m	Liquid: 0.48m	Liquid: 0.5 15m
process connection	GI 1/2A	G2A	Flanges or hangers
Material of transducer housing	PTFE、PU/PC	PTFE、PU/PC	PU/PC
Process temperature	-40…70℃	-40…70℃	-40…70℃
Process pressure	-0.2…1bar	-0.2…1bar	-0.2…1bar
Signal theft	Two wire/four wire 4... 20mA/HART	Two wire/four wire 4... 20mA/HART	Two wire/four wire 4... 20mA/HART

Selection of Ultrasonic Level Gauge Usage

DLM551
	explosion-proof
		Standard type (non explosion proof)
	I	EXiaIIBT6
		Transducer material/process temperature/protection level
		A	Pu/pc/-40-70℃/IP66
			PTFE/-40-70℃/IP67
			process connection
			default	CP thread G1 Half A
				electronic component
				A	4-20mA two-wire system
					4-20Ma/24VDC ± 10% four wire system
				C	4-20MAHART two-wire system
				D	4-20Ma/24VDC ± 10%/HART four wire system
					Shell/fire rating
						Plastic/IP66
					A	Aluminum/IP67
						Cable incoming line
						M	M20*1.5
							1/2NPT
							On site programming
							A	belt
							X	without

Note: Only the "A" type casing and "A" or "C" electronic components can be selected for intrinsic safety type