TEST REPORT No. 42c 002

Transcription

1 AGRICULTURAL MACHINES FUNCTIONAL AND SAFETY TESTING SERVICE TEST REPORT No. 42c 002 LIQUID FLOW METER: ORION ( l/min) MANUFACTURER: ARAG S.R.L. Via Palladio, 5/A Rubiera (RE) Rome, November /8

2 TESTS CARRIED OUT IN COMPLIANCE WITH ENAMA SPECIFICATIONS NO. 42C BY THE MECHANICS SECTION OF THE DEPARTMENT OF ECONOMICS AND AGRICULTURAL, FOREST AND ENVIRONMENTAL ENGINEERING, UNIVERSITY OF TURIN: Supervisor: Prof. Paolo Balsari Dr Mario Tamagnone To facilitate interpretation of the results, it should be remembered that: 1 l = 1 dm 3 C.V. (coefficient of variation) = parameter indicating the extent of data deviation from mean value. 2/8

3 TABLE OF CONTENTS TECHNICAL DATA 4 DESCRIPTION OF DEVICE 5 TEST METHOD 5 RESULTS 6 NOTES ON FUNCTIONALITY 7 REMARKS 7 3/8

4 Technical data Size length (body only) (mm): 110 length (including 1 ¼ M connection) (mm): 175 width (mm): 85 height (mm): 135 Diameter of liquid flow pipe (mm): 18.5 Measuring system: magnetic induction Voltage supply (VDC): Operating range (l/min): Display system: LCD display (Visual Flow version) Max. working pressure (bar): 20/40 Maximum nominal error: ±1% of end scale 4/8

5 totaliser showing the amount of liquid Description of device The device is capable of measuring liquid flow rates in pipes. It is available in a number of versions, with flow rates ranging from 0.5 to 600 l/min, with or without digital display (Visual Flow model). The flow rate is measured using a magnetic induction-based electronic system, making it possible to have a flow section that is totally unobstructed and without moving parts. This feature makes it possible to keep performance of the device unaltered over time, even when working with liquids in which suspended solids are present. Resistance to chemical agents and to high working pressure is achieved thanks to the use of stainless steel, polypropylene and polyamide materials. Polypropylene and polyamide are reinforced with glass fibres. The maximum working pressure (20 or 40 bar) depends on the type of connection used. It is available with flanged connections for Arag valves, series 463 and 473, or threaded 1 and 1 ¼ connections. Measurements may be viewed on the display or sent as an electric signal to other control units. The display unit (integrated in the Visual Flow model) consists of a liquid crystal display and two buttons. The display can show the instantaneous flow rate (expressed in l/min) or a (expressed in l) that has passed through the measuring device. The keys on the display unit can be used to modify the system s calibration constants. Test method The device in question was connected, via the 1 threaded connection, to the delivery pipe of a piston-diaphragm pump having a maximum nominal flow rate of 220 l/min. Rigid pipes 250 mm in length and 28 mm in diameter (inner) were used as flow meter device inlets and outlets. To obtain different flow rate values a flow regulation device was fitted between the pump and the measuring device being tested. Tests were carried out with water not containing suspended solids having a temperature of between 18 and 22 C and with a suspension having a 1% copper oxychloride concentration. Working pressures of 1.5 and 10 bar were used. Tests were performed within the instrument s nominal operating range (from 10 to 200 l/min). The accuracy of the flow meter under review was determined by comparing values given on the display with the actual amount of water passing through 5/8

6 the device, calculated by weighting with precision scales.. Measuring accuracy was expressed as the percentage difference between the value given on the display and the actual value. Reproducibility, ascertained via subsequent measurements using the same flow rate value, was expressed as the coefficient of variation (CV). All measurements were taken using the calibration coefficient (300 pulses/l) supplied by the manufacturer. Results functional tests, using the standard calibration coefficient supplied by the manufacturer, shows that the deviation between the actual flow rate and that indicated on the device display is generally below 1%. The mean error is 0.6%. (Fig. 1). The error calculated on the device s end scale value is less than the nominal value indicated by the manufacturer (Fig. 2). The performance of the flow rate meter in question is not unduly affected by the type of liquid used or by the working pressure. The analysis of values obtained during errore sulla lettura 5% 4% 3% 2% 1% 0% -1% -2% -3% -4% -5% portata (l/min) Fig. 1 - Difference (%) between actual values and those indicated by the device. 6/8

7 errore sul fondo scala 2,0% 1,5% 1,0% 0,5% 0,0% -0,5% -1,0% -1,5% -2,0% portata (l/min) Fig. 2 - Difference (l/min) between actual values and those indicated by the device. The coefficient of variation calculated on the basis of results obtained from successive measurements but using the same flow rate value is less than 1% under all test conditions. It is suitable for use with sprayers to control the amount of liquid delivered and to calculate the amount of water introduced into the tank during filling operations. Remarks Notes on functionality The flow meter under review proved capable of supplying good results within the nominal operating range. The device is endowed with a CE Declaration of conformity to Directive 89/336/EEC and subsequent amendments (electromagnetic compatibility) and with an owner s manual in compliance with existing law provisions. 7/8

8 THE PRESENT TEST REPORT IS VALID FOR A PERIOD OF FIVE YEARS OR UNTIL REFERENCE REGULATIONS FOR THE ORION LIQUID FLOW METER WITH FLOW RATE OF l/min ARE ALTERED, AND IS OFFICIALLY RECOGNISED BY ENAMA PARTNERS/MEMBERS: ASSOCAP (Associazione Nazionale dei Consorzi Agrari) (National Association of Farm Consortia) CIA (Confederazione Italiana Agricoltori) (Italian Farmers Confederation) COLDIRETTI (Confederazione Nazionale Coltivatori Diretti) (National Confederation of Independent Farmers) CONFAGRICOLTURA (Confederazione Generale Agricoltura) (General Farming Confederation) UNACMA (Unione Nazionale Commercianti Macchine Agricole) (National Union of Farm Machine Dealers) UNACOMA (Unione Nazionale Costruttori Macchine Agricole) (National Union of Farm Machine Manufacturers) UNIMA (Unione Nazionale Imprese Meccanizzazione Agricola) (National Union of Farm Mechanisation Enterprises) AND BY MEMBERS OF THE EXECUTIVE COUNCIL OF THE ENAMA, IN WHICH THE FOLLOWING ARE ALSO REPRESENTED: MIPAF (Ministry for Agricultural and Forestry Policies) Regions and Autonomous Provinces ISMA (Istituto Sperimentale per la Meccanizzazione Agricola) (Experimental Institute for Agricultural Mechanisation) ENAMA - ENTE NAZIONALE PER LA MECCANIZZAZIONE AGRICOLA (NATIONAL AGRICULTURAL MECHANISATION BODY) VIA LAZZARO SPALLANZANI, 22/A ROME TEL. 06/ FAX 06/ info@enama.it 8/8