Ultrasonic non-contact transit time water flow meter

The transit time type non-contact ultrasonic water flow meter is a non-invasive flow meter. The clamp-on transducer arrangements can detect in-situ flow rates from outside the pipework, without any interruption to flow or process.

Principle

As an ultrasonic beam travels through a liquid, the flow causes a slight change in its propagation time, directly proportional to the liquid’s velocity. At zero flow, the time for two sensors to emit and receive sound waves is identical, enabling precise measurement of no flow. As the liquid moves, sound waves take longer to travel upstream than downstream, allowing accurate determination of flow rate. The relationship conforms to the following expression:

ultrasonic_flowmeter_flow_meter_for_hot_water_8

Among them,
θ is the angle between the sound beam and the direction of liquid flow
M is the number of straight line propagation times of the sound beam in the liquid
D is the inner diameter of the pipeline
Tup is the propagation time of the sound beam in the positive direction
Tdown is the propagation time of the sound beam in the opposite direction, ΔT=Tup – Tdown

The measurement range is large, and different types of sensors can be used to measure the flow rate of pipelines with diameters ranging from DN15 to DN6000 mm.

High precision measurement, linearity better than 0.5%, repeatability accuracy better than 0.2%, measurement accuracy better than士1%;
Simple and economical installation;
The sensor can withstand temperatures up to 100℃ ;
Strong reliability, using low voltage and multi-pulse transmission circuits to significantly improve measurement accuracy, service life, and reliability;
Strong anti-interference ability, using dual balanced signal differential transmission and receiving circuit, effectively resisting strong interference sources such as frequency converters, TV towers, and high-voltage lines.

Parameter	Description
converter	principle	transit-time ultrasonic flow meter
	accuracy	±1%
	display	2*20 character LCD with backlight
	signal output	1 way 4-20mA output
		1 way OCT pulse output
		1 way relay output
	signal input	3 ways 4-20mA input, acquisition signal such as Temp, press, level, etc.
	signal input	connect the Temp transducer Pt100,can finish the heat measurement
	data interface	insulate RS-485 / MODBUS serial interface
pipe	pipe material	Steel, stainless steel, cast iron, copper, PVC, aluminum, etc.
	pipe diameter	DN50~6000mm
	straight pipe	upstream 10D,downstream 5D,30D from the pump
measuring medium	type of liquid	signal liquid can transmit sound wave,such as water(hot water,chilled water,city water,sea water,waste water,etc.); sewage with small particle content:oil(crude oil,lubricating oil, diesel oil, fuel oil, etc.) chemicals(alcohol,etc.);plant effluent;beverage;ultra-pure liquid,etc.
	temperature	-30~160℃
	turbidity	no more than 10000ppm and fewer bubbles
	Flow rate	0~±7m/s
working environment	temperature	converter:-20~30℃;flow transducer:-30~160℃
working environment	humidity	converter:85% RH;
power supply	DC 8~36V or AC 85~264V
consumption	1.5W