Fixed Clamp-on type Ultrasonic Flow Meter

The RBBF Clamp-on Ultrasonic Flow Meter is a fixed-mount, low cost transit-time ultrasonic flow meter with clamp-on transducers for non-invasive liquid flow rate measurement. Our microprocessor-based, user friendly field programmable creates no interruption of the process flow and has low installation costs.

This versatile series of flow meters is available in a variety of configurations. Available transducer types include clamp-on, in-line, and insertion. Wall-mount, panel-mount, pipe-mounted and compact din-rail mounted display types are also offered. Additional available features include pulse, 0-20mA & 4-20mA outputs, RS-232 communication, user-selectable engineering units, and a data logger function.

Description

Principle
Features
Specification
Model Selection
Applicants
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Principle

Measuring principle of Transit-time Ultrasonic Flowmeters

RBFM Series Clamp-on transit time flow meter utilizes two transducers that function as both ultrasonic transmitters and receivers. The transducers are clamped on the outside of a closed pipe at a specific distance from each other. The transducers can be mounted in V-method in which case the ultra sound transverses the pipe twice, or W-method in which case the ultra sound transverses the pipe four times, or in Z-method in which case the transducers are mounted on opposite sides of the pipe and the ultra sound transverses the pipe only once. The selection of mounting method depends on pipe and liquid characteristics. When the flow meter works, the two transducers transmits and receives ultrasonic signals amplified by multi beam which travels firstly downstream and then upstream (Figure 1). Because ultra sound travels faster downstream than upstream, there will be a difference of time of flight(△ｔ). When the flow is still, the time difference(△ｔ) is zero. Therefore, as long as we know the time of flight both downstream and upstream, we can work out the time difference, and then the flow velocity (V) and flow volume (Q) via the following formula.

V= K*D* △ｔ

V: Liquid velocity

K: Constant

D: Distance between the two transducers

△ｔ: Difference in time of flight

Features

RBBF Fixed Clamp-on Type Ultrasonic Flow Meter Features:

Wide range velocities of ±0.1~ ± 12m/s (0.03 ~ ± 105 feet/sec.)
High accuracy of ± 1% of reading.
Transducers for pipe sizes ranging from13 to 6000 mm (½" to 240").
Fast response time - less than 1 second.
2 line LCD display with flow rate, totalizer & signal condition.
Stores up 64 Day/months totalzier daily value.
Batch control function
Transducers for pipe sizes ranging from13 to 6000 mm (½" to 240").
0-20mA & 4-20mA outputs, RS-232 communication, user-selectable engineering units, and a data logger function
Clamp-on transducers feature integral magnet for installation on metal pipe without use of a mounting belt
Data logger function includes date, totalizer, & signal condition diagnostic

Specification

RBBF Fixed Clamp-on Type Ultrasonic Flow Meter Features:

Transducer	Standard Type			S type		Pipe size		(15 mm ~ 100 mm) ½" ~ 4"
						SN		SH	-30~160℃
						Size(mm)		SN	45×25×28
				M Type		Pipe size		50 mm ~ 700 mm (2" ~ 28" )
						Temp.		MN	-30~160℃
						Size(mm)		MN:	64×35×32
				L Type		Pipe size		300~ 6000(12" ~ 240" )
						Temp.		LN	-30~160℃
						Size(mm)		LN	97×54×53
				Insertion Type		Pipe size		80~6000mm
						Temp.		RCN		-40 ~ 160℃
								RCL(Extended)		-40 ~ 160℃
Temp. Sensor						Pt100 3 wires
						Pt100 3 wires(only for small pipes)
Fluid	Water, sea water, industrial sewage, acid & alkali liquid, alcohol, beer, all kinds of oils which can transmit ultrasonic single uniform liquid
Flow Direction	Bi-directional measuring, net flow/heat measuring
Accuracy	± 1% ~ ± 2% of reading (1.5 ~ 100 feet/sec.)
Repeatability	± 0.2% of reading
Flow rate range	0.01 ~ ± 12 m/s
Response Time	Less than 1 second
Keypad	16 Key with tactile action
Pipe Material	Steel, stainless steel, cast iron, cement pipe, copper, PVC, aluminum, FRP etc. Liner is allowed
Liner Material	Tar Epoxy, Rubber, Mortar, Polypropylene, Polystryal, Polystyrenes, Polyester, Ebonite, Polyethylene, Teflon, etc.
Mounting	wall mounting, local
Display	2 Line LCD with backlight; 5 digits with decimal point for flow rate, 8 digits for Forward, Reverse & Net totalized values
Output	Analog		4-20mA or 0-20mA current output. Impedance 0∼1kW. Accuracy 0.1%.
	Relay output		Over 20 source signal (no signal, reverse flow etc.)
	Pulse Output		Frequency signal :1~9999 Hz
Input	Three analogue input
	Three-wire PT100 resistor input (optional)
Other functions	Automatically record the totaliser data of the last 64 days / 64 months / 5 years; The power-on time and corresponding flow rate of the last 64 power on and off events. Allow manual or automatic flow loss compensation The instrument working status of the last 64 days
Communication	RS-232/RS485
Alarm	High/Low with buzzer
Protection	Transmitter	IP 65			Sensor		IP67/IP68 (optional)
Straight pipe section	In the upstream it must be beyond 10D, in the downstream it must be beyond 5D, in the upstream the length must be beyond 30D from the access of the pump. (D stands for pipe diameter)
Cable Length	Twisted Pair Line, standard length of 10m, can be extended to 500m (not recommended); Contact the manufacturer for longer cable requirement. RS-485 interface, transmission distance up to 1000m
Power Supply	Remote Type				90 ~ 260VAC 50/60 Hz; 9-28VDC
	Compact Type				9-28VDC
Power Consumption	Less than 2W
Data Storage	Operation parameters and tantalization data are stored in EEPROM for more than 10 years
Engineer Unit	M3, Liter, US gallon, Imperial gallon, Million gallons, Cubic feet, US Barrels, Imperial barrels, Oil barrels
Time Units	Second, Minute, Hour, Day
Protocols	MODBUS, M-BUS, Fuji extended protocol and other factory protocol
Humidity	Main Unit: 85% RH
Remarks: With a high strength carrying case suitable for normal and harsh environment

Model Selection

RBFM Ultrasonic Flow/Heat Meter Model Selection

RBFM

DNxx

Instrument Type

Ultrasonic Flowmeter

Ultrasonic Heat meter

Power supply

220VAC

24VDC

Battery

Flow/Heat meter Type

Fixed type

Handheld type

Flanged type

Battery type

Transducer Type

S type(pipe size: 15-100mm, temp.: -30 to 90℃)

S type(pipe size: 15-100mm, temp.: -40 to 160℃)

SPMN

S type with mounting frame only for Handheld (pipe size: 15-100mm, temp.: -40 to 90℃)

SPMH

S type with mounting frame only for Handheld(pipe size: 15-100mm, temp.: -40 to 160℃)

M Type(pipe size: 50-700mm, temp.: -30 to 90℃))

M Type(pipe size: 50-700mm, temp.: -40 to 160℃))

MPMN

M type with mounting frame only for Handheld (pipe size: 50-300mm, temp.: -40 to 90℃)

MPMH

M type with mounting frame only for Handheld (pipe size: 50-300mm, temp.: -40 to 160℃)

RB-1

extended the mounting frame, for pipe:DN300-700mm, temp.: -40 to 90℃

RBH

extended the mounting frame, for pipe:DN300-700mm, temp.: -40 to 90℃

L type(pipe size: 300-6000mm, temp.: -30 to 90℃)

L type(pipe size: 300-6000mm, temp.: -40 to 160℃)

Insertion Type

Extended type

Flanged type

Pt100

Temperature sensor

DNxx

Pipe size

Pipe material

Carbon Steel

Stainless Steel

cast iron

Fibreglass

PVC

cement pipe

Others, clarify

Pressure(MPa)

Output

4-20mA

Pulse

Relay

RS232

RS485

Datalogger

Input

1*4-20mA

2*4-20mA

3*4-20mA

Cable length

meter

Applicants

RBBF Fixed Clamp-on Type Ultrasonic Flow Meter can be applied to a wide range of pipe flow measurements.

Applicable liquids include pure liquids as well as liquid with small quantity of tiny particles.

Examples are:

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, acids, etc.);

Plant effluent;

Beverage, liquid food;

Ultra-pure liquids;

Solvents and other liquids

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Fixed Clamp-on type Ultrasonic Flow Meter

Description

Measuring principle of Transit-time Ultrasonic Flowmeters

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