data sheet fjc this is a weir flow transmitter utilizing an induction po- tentiometer. a weir or parshall flume is installed along an open chan- nel 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. 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 inspec- tion. measuring range: any water head of 0 to 90?800 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 in- clude 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 550 ? (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: ?0 to +80 c (but not usable in freezing condition) 50 c max. with intrinsically safe ex- plosionproofing 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 coun- terweight) 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) weir flow transmitter features specifications date EDS6-6G nov. 30, 1995
2 fjc fig. 3 parshall flume structural diagram fig. 2 weir structural diagram fig. 1 measuring principle diagram full-width weir rectangular weir triangular weir applicable applicable ? asterisked (*) items: nonstandard. full ?width weir b 0.5m d = 0.3?.5m h = 0.03 ?0.8m and less than rectangular weir b = 0.5 ?6.3m b = 0.15 ?5m d = 0.15 ?3.5m h = 0.03 ? m triangular weir b = 0.5 ?1.2m d = 0.1 ?0.75m h = 0.07 ?0.26m and less than b 3 b 4 bd b 2 0.06 b calls w (mm) flow rate (m 3 /h) 76.2 152.4 228.6 304.8 457.2 609.6 914.4 1219.2 1524.0 1828.8 2133.6 2438.4 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 max. 193 398 907 1641 2508 3374 5138 6922 8726 10551 12376 14221 min. 3 5 9 11 15 43 62 133 163 265 306 357 code symbols 4 c j f0 - 10 2 1 345678 9 description y b d a b k v s a b c d e f e s * * material of float poly vinyl chloride sus304 (stainless steel) length of wire rope 5 m 10 m 15 m 20 m 25 m 30 m treatment for general use acid and alkaliproof treatment chlorine-proof treatment transmitter, arrester 4 to 20ma dc 4 to 20ma dc intrinsically safe explosionproof structure for instrumentation system 4 to 20ma dc, with arrester material of counterweight iron sus304 (stainless steel)
3 weir flow rate vs. water head curves
4 fjc parshall flume flow rate vs. water head curves (w:3 in to 5ft) 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 s 1 and s 2 are equal. but if the ring rotates to the right side for example, then the flux at s 1 will increase and that at s 2 will decrease. upon detecting this difference, an output voltage is pro- duced which is proportional to the ring displacement (in- put rotating angle). principle of induction potentiometer
5 outline diagram (unit:mm)
fjc 1. object to be measured or application 2. product name 3. code symbols 4. measuring range 5. 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 distributor connection diagrams example of configuration according to power supply ordering information related instrument information in this catalog is subject to change without notice. printed in japan 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 caution on safety *before using this product, be sure to read its instruction manual in advance.
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