LIQUID LEVEL TRANSMITTER (FLOAT TYPE)

DATA SHEET FNF

This is a liquid level transmitter utilizing an induction

potentiometer.
The vertical displacement of a flat on a liquid surface in
an open tan k is conveyed by a strip of stainless steel wire
rope to the transmitter body, and inputted as a rotating angle
to the induction potentiometer which transmits a signal
current of 4 to 20mA DC proportionate to the displacement
of the liquid level.

FEATURES
1. High reliability
Use of a contactless induction potentiometer means a
long life and high reliability of the instrument.
2. Various specifications available
The transmitter can be provided with intrinsically safe
explosionproofing, various materials for its components,
an arrester, an alarm unit plus other specs.
3. The operating principle and structure of the transmitter
are simplified which enables easy handling, maintenance
and inspection.
Materials: Float; Hard PVC or SUS304 (stainless
steel)
Rope: Teflon coating on stainless steel
SPECIFICATIONS wire
Counterweight; Iron piece coated with
Measuring range: 0 to 0.5……40m zinc metallikon or SUS304
(Refer to standard measuring ranges) Instrument body; Aluminum alloy
Indicator: Digital type (4 digits) Conduit connection: G3/4
Allowance: ± 1.0% or ± 0.5% on request Case: Splash-proof type (JIS C 0920)
Output signal: 4 to 20mA DC Arrester: Built in on request
Ripple content: 1.5% p-p (at approx. 25kHz) Explosionproof structure: Intrinsically safe explosion-
Allowable load resistance: proofing i3nG5
0 to 550Ω (at 24V DC) Mass {weight}: Approx. 10.5kg
Power supply: 13 to 33V DC (excluding float and counterweight)
(26V DC or less with intrinsically safe External dimensions (H × W × D):
explosionproofing) Approx. 320 × 346 × 218mm
(27V DC or less with arrester) Finish color: Silver (melamine paint); may be provided
100V/24V ± 10% , AC 50/60Hz with acid and alkaliproof treatment
(see "Example of configuration") Optional attachment: Alarm unit (limit switch)
Wiring method: 2-wire type (Alarm unit can't be installed with
Ambient temperature: intrinsically safe explosionproof)
–30 to +80°C structure);
(but not usable in freezing condition) Contact capacity
50°C max. with intrinsically safe 250V AC 5A
explosionproofing 230/115V DC 0.2/0.4A
60°C max. with arrester N.O.-1a- contact
Ambient humidity: Less than 95% RH 3 pieces are available in the
Liquid temperature: Less than 45°C transmitter for upper limit and
(when float material is PVC-vinyl lower limit
chloride-)

EDS7-3i
Date July. 18, 2006
 FNF

Range of delivery: Transmitter and standard accessories

(rope, float, and counterweight)
CODESYMBOLS
1 2 3 4 5 6 7 8 9 10 11 12 13

F NF 4 1 Description
Lenght of rope [m]
Standard measuring ranges A
B
5
10
C 15
D 20
Measuring Measuring Measuring Measuring
E 25
ranges ranges ranges ranges F 30
0 to 0.5m 0 to 3.5m 0 to 6.0m 0 to 10.0m G 40
H 50
0 to 1.5m 0 to 4.0m 0 to 6.5m 0 to 12.0m J 60
0 to 2.0m 0 to 4.5m 0 to 7.0m 0 to 14.0m K 80
0 to 2.5m 0 to 5.0m 0 to 8.0m 0 to 15.0m Float material
V PVC
0 to 3.0m 0 to 5.5m 0 to 9.0m 0 to 16.0m S SUS304 (stainless steel)
Counterweight material
E Steel
S SUS304 (stainless steel)

RELATED DEVICE A
Transmitter
4 to 20mA
B 4 to 20mA intrinsically safe
explosionproof structure
K Arrester with "A"
Distributor Alarm unit (limit switch)
Note: Impossible when "B"
specified in 7th dight
ORDERING INFORMATION 0 None
of code.

2 Upper.lower limit, 1 piece each

4 Upper.lower limit, 2 pieces each
6 Upper.lower limit, 3 pieces each
1. Object to be measured ro application Guide pulley
2. Product name 0 None
1 Provided with 1 pulley
3. Code symbols 2 Provided with 2 pulleys
4. Measuring range 3 Provided with 3 pulleys
5. Rope lenght Allowance
6. Float, counterweight meterial 0 ±1% (standard instrument)
1 ±0.5%
7. Whether or not any attachments (guide pulley, alarm (high allowance instrument)
unit, etc.) are required
Treatment
8. Whether or not wxplosionproofing and other measures Y Standard
are required * B Acid and alkaliproof treatment
* D Chlorine-proof treatment
9. Other matters that demand care

INSTALLATION DIAGRAM

CONNECTION DIAGRAMS

2
PRINCIPLE OF INDUCTION POTENTIOMETER

When the short circuit ring is positioned at the center, flux at S1 will increase and that at S2 will decrease. According
the magnetic flux at left and right sides is equal and the to this difference an output voltage is provided which is
voltages produced at detecting coils S 1 and S2 are equal. proportional to the ring displacement (input rotating angle).
But if the ring rotates to the right side for example, then the

EXAMPLE OF CONFIGURATION

O- I-

O+ I+

With 24V DC power supply

O- +

O+ -

With 100V/24V AC power supply

3
 FNF

Transmitter
Approx. 218
Approx. 160 14
27
Pulley

ø332
ø262

45

20 Stopper

180

15
50 31 280
100 320
"A" 2-ø18
Conduit connection (2 pieces) 318
holes

Details of "A"
ø20
8

Float Counterweight
16

G 3/4

Float Counterweight

Hard PVC SUS304 (stainless steel)

Guide 250
262
30
16

ø21

ø38

18 Guide

Approx. 276 Approx. 277

ø3.5 hole
5

ø3.5 hole
175

185
140

150

ø216
ø216

Caution on Safety Asterisked (*) items: Non-standard.

*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