EDS6-6G

WEIR FLOW TRANSMITTER DATA SHEET This is a weir flow transmitter utilizing an induction potentiometer. A weir or parshall flume is installed along an open channel and the head of the water flowing through it is detected by a float and conveyed as a rotating angle to the induction potentiometer which transmits a signal current of 4 to 20mA DC proportionate to the flow rate. FJC FEATURES 1. High reIiabiIity Use of a contactless induction potentiometer assures a long life and high reliability of the instrument. 2. A variety of specifications available The transmitter can be provided with intrinsically safe explosionproofing, various materials for the components, an arrester plus other items. 3. The operating principle and structure of the transmitter are simplified for easy operation, maintenance and inspection. SPECIFICATIONS Measuring range:Any water head of 0 to 90…1800 mm (see the attached characteristic curves for the relation between water head and flow rate) Indicator: Analog type (0 to 100% scale) Allowance: ± 1.0% (less than 10% of full scale is not guaranteed; this accuracy does not include the instrumental error of weir and flume) Output signal: 4 to 20mA DC Ripple content: 1.5% p-p (at approx. 25 kHz) Allowable load resistance: 0 to 550Ω (at 24V DC) Power supply: 13 to 33V DC (less than 26V DC with intrinsically safe explosion-proofing) (less than 27V DC with arrester) 100/24V AC ± 10%, 50/60 Hz (see example of configuration on final page) Wiring method: 2-wire system Ambient temperature: –30 to +80°C (but not usable in freezing condition) 50 ° C max. with intrinsically safe explosionproofing 60°C max. with arrester Ambient humidity: Less than 95% RH Principal materials: Wire rope; SUS304 (stainless steel) Float; Hard PVC or SUS304 Counterweight; Coated with zinc metallikon or SUS304 Instrument body; Aluminum alloy Conduit connection: G3/4 internal thread Enclosure: Splash-proof (JIS C 0920) Arrester: Built in when requested Explosionproof structure: Intrinsically safe explosionproofing i3nG5 Mass: Approx. 10.5 kg (excluding float and counterweight) External dimensions (HxWxD): 320 x 304 x 218 mm Finish color: Silver (melamine paint); may be provided with acid and alkaliproof treatment Range of delivery: Transmitter, Float, Counterweight, Wire rope (Weir excluded) EDS6-6g Date NoV. 30, 1995 FJC Fig. 1 Measuring Principle Diagram Full-width weir Rectangular weir Triangular weir Fig. 3 Parshall Flume Structural Diagram Fig. 2 Weir Structural Diagram Applicable Full – Width weir B ≥ 0.5m D = 0.3–2.5m h = 0.03 – 0.8m and less than B 4 Rectangular weir B = 0.5 – 6.3m b = 0.15 – 5m D = 0.15 – 3.5m — h = 0.03 – √ b m bD B 2 ≥ 0.06 Triangular weir B = 0.5 – 1.2m D = 0.1 – 0.75m h = 0.07 – 0.26m and less than B 3 Applicable Calls 3 in 6 in 9 in 1 ft 1.5 ft 2 ft 3 ft 4 ft 5 ft 6 ft 7 ft 8 ft W (mm) 76.2 152.4 228.6 304.8 457.2 609.6 914.4 1219.2 1524.0 1828.8 2133.6 2438.4 Flow rate (m3/h) Max. Min. 193 3 398 5 907 9 1641 11 2508 15 3374 43 5138 62 6922 133 8726 163 10551 265 12376 306 14221 357 CODE SYMBOLS 12345678 9 10 FJC A B C D E F V S E S A B 4-0 Description Length of wire rope 5m 10 m 15 m 20 m 25 m 30 m Material of float Poly vinyl chloride SUS304 (stainless steel) Material of counterweight Iron SUS304 (stainless steel) Transmitter, Arrester 4 to 20mA DC 4 to 20mA DC intrinsically safe explosionproof structure for instrumentation system 4 to 20mA DC, with arrester K Y B D * * Treatment For general use Acid and alkaliproof treatment Chlorine-proof treatment • Asterisked (*) items: Nonstandard. 2 Weir flow rate vs. water head curves 3 FJC Parshall flume flow rate vs. water head curves (w:3 in to 5ft) PRINCIPLE OF INDUCTION POTENTIOMETER When the short circuit ring is positioned at the center, the magnetic flux at left and right sides is equal and the voltages produced at detecting coils S1 a nd S2 a re equal. But if the ring rotates to the right side for example, then the flux at S 1 w ill increase and that at S 2 w ill decrease. Upon detecting this difference, an output voltage is produced which is proportional to the ring displacement (input rotating angle). 4 OUTLINE DIAGRAM (Unit:mm) 5 FJC EXAMPLE OF CONFIGURATION ACCORDING TO POWER SUPPLY CONNECTION DIAGRAMS ORDERING INFORMATION 1. 2. 3. 4. 5. Object to be measured or application Product name Code symbols Measuring range Weir specs (kind of weir and dimensions of each part, B. b. D) 6. Parshall flume size (W) 7. Float and counterweight material 8. Whether arrester and explosionproofing required RELATED INSTRUMENT Distributor Caution on Safety *Before using this product, be sure to read its instruction manual in advance. Head Office Gate City Ohsaki, East Tower, 11-2, Osaki 1-chome, Shinagawa-ku, Tokyo 141-0032, Japan http://www.fesys.co.jp/eng Instrumentation Div. International Sales Dept. No.1, Fuji-machi, Hino-city, Tokyo, 191-8502 Japan Phone: 81-42-585-6201, 6202 Fax: 81-42-585-6187 http://www.fic-net.jp/eng Information in this catalog is subject to change without notice. Printed in Japan