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Dimensions Types Application - Automated Control

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RISONIC 2000 Transducer for Channel Type: MFATKx<br />

Ultrasonic-Flowmeasurement for Channels Order-No.: refer to table<br />

<strong>Dimensions</strong><br />

<strong>Types</strong><br />

The amount of transducers under the order number are delivered as one path set.<br />

Type Order-No. Sound path length Oscillator ∅ A Way of mounting Frequency<br />

MFATK1 00 66<br />

800.001<br />

MFATK2 00 66<br />

805.001<br />

0.75...2 m [2.4...6.6 ft] 10 mm [0.39“] Surface / Flush<br />

mounting<br />

>2...14 m [>6.6...46 ft] 16 mm [0.62“] Surface / Flush<br />

mounting<br />

1 MHz<br />

1 MHz<br />

<strong>Application</strong><br />

The RISONIC ultrasonic measurement method uses the travel time difference of ultrasonic sound pulses to<br />

determine the flow velocity of liquids in open channels. The ultrasonic pulses are sent out upstream and<br />

downstream across the flow with an the angle α between the direction of flow and the sonic path. The<br />

measurement is carried out with very little restriction of the width of the open channel and therefore causes<br />

hardly any head losses.<br />

The sensors of the type MFATKx can be used in open channels (rectangular, trapezoidal, circular) and in<br />

pressure tunnels. For installation and doing service the open channels have to be dewatered.<br />

200805 WAL/Ges Subject to changes Page 1/4<br />

Data sheet hardware<br />

DG DKap Stamm-Bez. Var Ind F Sp<br />

22.210.006680x.001.03.4.4<br />

© 2008 by Rittmeyer AG, CH-6341 Baar


RISONIC 2000 Transducer for channel<br />

MFATKx<br />

The liquid has to be transparent for ultrasonic sound, i.e. the liquid should not contain a high concentration of<br />

particles or entrained air bubbles and sediments. In addition, no stratified flows should occur. Further,<br />

temperature and/or salinity gradient, if present, should be within acceptable limits (bending of sonic path).<br />

High accuracy is guaranteed by independence of parameters such as temperature, pressure, electrical<br />

conductivity etc.<br />

Installation of the sensors: The angle α between the sonic path and direction of flow should preferably be<br />

45 °. In case of rectangular open channels an angle α between 35°...70° is admitted. Other angles are<br />

admitted depending on channel shape (and processing unit).<br />

Short description<br />

The RISONIC sensors MFATKx serve alternately as transmitter and receiver. A voltage surge excites the<br />

piezoelectric oscillator. The ultrasonic sound pulses propagate through the liquid to be measured. On the<br />

opposite side of the open channel, the sound pulses are received, converted into an electrical signal and<br />

further processed by the processing unit MFPxxx.<br />

MFATKx consists of a sphere, the transducer-housing and two covers.The necessary accessories and<br />

instructions are available for installation.<br />

The RISONIC-transducers can be installed at a maximum distance of 300 m (984 ft) from the processing unit<br />

(triaxial cable). To prevent cables from damage, protection tubing and fexible conduits are available at<br />

Rittmeyer AG.<br />

Technical Data<br />

• Protection Class<br />

IP 68 (NEMA 6) submersible<br />

• Minimum Path Length:<br />

750 mm (2.46 ft) flush mounting required<br />

• Maximum Path Length:<br />

14 m (46 ft)<br />

• Material of Sphere:<br />

PVC grey<br />

• Material of Sensor Housing: Stainless steel 1.4305 (AISI 303)<br />

• Material of Cover Stainless steel 1.4305 (AISI 303)<br />

• Max. Pressure allowed:<br />

10 bar (145 psi)<br />

• Operating Temperature:<br />

-30°C ..... +70°C (-22°F...+158°F)<br />

• Humidity:<br />

100% r.F.<br />

• Weight Transducer MFATKx<br />

4.52 kg (10 lb.) per couple of 2 units<br />

Quality Tests<br />

1. Tests of ElectromagneticCompatibility (EMC)<br />

Test IEC - Standards Severity Level<br />

Pulse withstandability test 0.01 IEC 255-5 3<br />

Dielectric strength 0.02 IEC 255-5 4<br />

Insulation resistance 0.03 IEC 255-5 3<br />

Surge, High energy pulses 2.01 4<br />

2. Climatic test<br />

Test IEC - Standard Severity Level<br />

Climatic test IEC 68-2-38<br />

200805 WAL/Ges Subject to changes Page 2/4<br />

Data sheet hardware<br />

DG DKap Stamm-Bez. Var Ind F Sp<br />

22.210.006680x.001.03.4.4<br />

© 2008 by Rittmeyer AG, CH-6341 Baar


RISONIC 2000 Transducer for channel<br />

MFATKx<br />

Notes on the correct use of ultrasonic flow measurement in open<br />

channels<br />

• The layout of the RISONIC-Measurement system has to be done according to the specifications of<br />

Rittmeyer AG.<br />

• A sensor alignment of ±1° or better under operating conditions is necessary. The survey should<br />

preferably be done with a theodolite system.<br />

• No stratified flows should occur. Temperature and/or salinity gradient, if present, should be within<br />

acceptable limits (bending of sonic path) and no considerable gas content should be in the water.<br />

• The guidelines in the assembly and setup instructions of the Transducers MFATKx are to be followed.<br />

Technical Data Triaxial cable<br />

• Electrical Impedance:<br />

75 Ω±3 Ω<br />

• Insulation Resistance:<br />

> 10 8 MΩ/m<br />

• Weight of Cable:<br />

7.7 kg/100 m (17 lb / 328 ft)<br />

• Cu-Conductor Copper, ∅ = 0.47 mm (0.0185“)<br />

• Cable: Polyethylene, black, ∅ = 7.35 mm (0.289“)<br />

• Min. Bending Radius: Single bending 40mm (1.57“)<br />

Multiple bending 75mm (2.9“)<br />

Flexible applications 150mm (5.9“)<br />

Accessories (optional)<br />

Type<br />

Order No.<br />

Triaxial cable (max. length 300 m, 984 ft) MFUZTK 04 64 980<br />

Laser for Channel Measurement MFUZKL 00 65 830.001<br />

200805 WAL/Ges Subject to changes Page 3/4<br />

Data sheet hardware<br />

DG DKap Stamm-Bez. Var Ind F Sp<br />

22.210.006680x.001.03.4.4<br />

© 2008 by Rittmeyer AG, CH-6341 Baar


RISONIC 2000 Transducer for channel<br />

MFATKx<br />

Empty page<br />

200805 WAL/Ges Subject to changes Page 4/4<br />

Data sheet hardware<br />

DG DKap Stamm-Bez. Var Ind F Sp<br />

22.210.006680x.001.03.4.4<br />

© 2008 by Rittmeyer AG, CH-6341 Baar

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