PERFECT ISOLATION BY MAGNET COUPLING
COVERING HIGH TEMP., HIGH PRESS., AND VACUUM APPLICATIONSPRESSURE TIGHT FLAMEPROOF FOR HYDROGEN ATMOSPHERE READYSPRING BALANCED DISPLACER TYPE

FS-100 Series
LEVEL SWITCHOUTLINE
FS-100 is a spring balanced displacer type levelswitch.
The pressurized part and electric part are perfectly
isolated by magnet coupling system to offer much
more safety and durability compared to other mechanical sealing types.
FS-100 can meet tough application with high temperature and high pressure.

FEATURES

MAIN APPLICATIONS❏ Wide selection range for temperature and pressure.
❏ Variety of material selection for displacer, springand chambers for suitable anticorrosive capability.
❏ Perfect isolation between pressurized part andelectric compartment by magnetic coupling forhigh reliability and safety.
❏ In addition to watertight construction, pressuretight and intrinsically safe versions are ready tomeet hazardous application.
Especially, pressure tight flameproof suitable for
Hydrogen atmospher (Ex dIIC T6) is available
which eliminates the necessity of safety barriers.

❏ Fuel oil tank level control❏ Process control for petrochemical plants❏ Water treatment plants❏ Oil rig's platform❏ Other liquid level control

TG-L2291-E00
1st edition Sep 2022 K

FS-100 DISPLACER, LEVEL SWITCHSTANDARD SPECIFICATION● Detection theory: By spring balanced displacer● Measuring object: All types of liquids(Liquid level or liquid interface)● Density: For level detection 0.45 g/cm3 or more

● Standard Material:(Refer to MODEL CODE for special material availability)
Liquid wetting partFor liquid interface detection*
Difference of 0.2 g/cm3 or more
*Number of points for alarm: 1 point● Viscosity: Max. 600 mPa∙s. Liquid without sticking,crystallization, or freezing

Displacer

SUS304, SUS316, SUS316L

SpringSUS316

RodSUS316

WireSUS316

Chamber

Carbon steel, SUS304, SUS316, SUS316L● Accuracy: ±10 mm (Density 1.0 g/cm )(For level detection with water (AMB, ATM))

Vapor contacting part

● Repeatability: ±5 mm (Density 1.0 g/cm3)(For level detection with water (AMB, ATM))Top flange

3: Max.40 mm (Density 1.0g/cm3)● Reset span

: Full vacuum to 4.9 MPa● Temp. Range: –60 to +400˚C(Upto -196˚C on request. Consult
factory for details.)● Enclosure:● Amb. Temp.

Carbon steel, SUS304, SUS316
SUS316L

Electric housing Aluminum die-casting● Alarm contact: 1,2,3 or 4 points
Limitation based on switch type
and temperature range are applicable, Refer to MODEL CODE ① for further details.

● Type of contact

Watertight
IP65 Equ.
Pressure tight flameproof
Ex d IIC T6
Intrinsically safe
EX ia IIC T6

SUS304, SUS316

Non-contacting partExceeds 40 mm depending on switchtypes, density and number of alarm points.
● Pressure range

Lead pipe: Standard SPDT Microswitch
Options

FS-10 □ W

2SPDT(Equ. to DPDT action)

FS-10 □ EX
FS-10 □ S

Hermetical sealedMicroswitch: –20 to +80˚C–20 to +55˚C for pressure tight flameproof● Contact capacity: Refer to Model CODE ①● Cable entry:–20 to +60˚C for Intrinsically safe versions● Type of process connection and flange sizes:ModelFS-10 □W

Classification
Watertight◎: Standard◯: Optionally available

FS-10 □EX

Ex d IIC T6—: Not available

FS-10 □S

Ex ia IIC T680 mm (3")

Remarks–
Cable dia. ø9 to 11
Cable dia. ø12 to 14–

NPT thread etc. are applicable with adapter.

1 Tank top, welding Internal chamber type
Size

Cable entry
G1/2 or G3/4
G1/2
G3/4
G1/2 or G3/4

Density < 0.68 g/cm3 Density ≥ 0.68 g/cm3● Terminal—: FS-10 □ W, E X, S
: Up to 150°C - M3.5 screw
Over 150°C - M3 screw

100 mm (4")● Painting

125 mm (5"): For liquid temp. upto 150˚C
Polyurethan resin painting

150 mm (6")

For liquid temp. more than 151˚C

2 Tank top, insertion internal chamber type
Size

Silicone resin painting

Density < 0.68 g/cm Density ≥ 0.68 g/cm
380 mm (3")—

100 mm (4")—

3● Colour: Silver (standard)—

125 mm (5")
150 mm (6")

3 Tank side, external chamber type
Size
80 mm (3")

Density < 0.68 g/cm3 Density ≥ 0.68 g/cm3—

100 mm (4")
125 mm (5")
150 mm (6")

INSTRUCTION FOR USE● The FS level switch with a spring operates in response to changes in the buoyancy of the displacer. Because alarms are set at a given operating density and temperature, if the density or temperature changes, the alarm level may shift or the alarm may not be issued.
● Do not use this switch in tanks with a mixer or other similar apparatus.
2TOKYO KEISO CO., LTD.

TG-L2291-E00

FS-100 DISPLACER, LEVEL SWITCH

ALARM POINT

INTRINSICALLY SAFE RELAY (EB3C)

The following figure shows alarm points that can be set under conditions of room temperature, atmospheric pressure, and a liquid
equivalent to water. The alarm points depend on the design.

Intrinsically safe relay is to be inserted into the contact loop of FS10 □S type level switch. 1 to 3 points use relays are available. Select suitable IS relay considering the total number of contacts.

Standard specification
Explosion protection
Rated operating voltage
Rated operating current
Installation location
Contact configuration
Relay output(Resistance load)
Contact allowable power(Resistance load)
Insulation resistanceWithstand voltage● For 1 point alarm(H or L)● For 2 points alarm(H-H, H-L or L-L)

Model code
EB3C- R□□Output typeR01
02
No. of contact03

Intrinsically safe Ex ia IIC
12 V DC ±10%10 mA DC ±20%Non-hazardous area
1a contact
250 V AC, 3A
24 V DC, 3A
750 VA AC
72 W DC500 DC V at 10MΩ
1500 V AC (1 min.)□A
DPower supply

EB3C-R01□
42Description
ModelRelay output
1 point use
2 points use
3 points use
100 V to 240 V AC, 50/60 Hz
24 V DC

EB3C-R02□, R03□
77.5(4)656175

65r"QQMJDBCMFDSJNQJOH
terminal

46

MAX.6

MIN.ø3

10

MAX.3

MIN.5.4

Terminal screw size : M3

EB3C Dimensions● For 3 points alarm(H-H-L or H-L-L)● For 4 points alarm(H-H-L-L)

CAUTIONS FOR PIPING● In case of the frameproof type (FS-10□EX) and intrinsically safe type (FS-10□S) to be used in Japan, the cablewiring is to be conducted in accordance with the enforcement regulations of "Cable Wiring" system in FLAMEPROOF TYPE CABLE WIRING as specified in "Industrial Safety and Health Law". For details, refer to "USER'SGUIDELINES for Electrical Installation for Explosive Gas Atmospheres in General Industry" edited by MINISTRY OF
HEALTH, LABOUR AND WELFARE RESERCH INSTITUTE OF INDUSTRIAL SAFETY JAPAN.
● FS-10□EX type pressure tight flameproof version is certified for Ex d II C T 6 classification under the condition ofusing our designated pressure tight cable glands which are delivered together with level switches. They are to beproperly installed.
TG-L2291-E00

TOKYO KEISO CO., LTD.

3

FS-100 DISPLACER, LEVEL SWITCH

MODEL CODE

Switch Type,Enclousure

FS-10

11 SWITCH TYPE, TEMP, CLASSMAX
CON/OFF CONTACT SWITCH SWITCH CONTACT MINIMUM NO. OF POSSIBLE
O LIQUID TEMPAPPLICABLE COOLING ALARM
MECHANISM TYPEDMODEL SUPPLIER CAPACITY(˚C)
LOADFIN CONTACTE
TYPE

1–25~150

2151~230

3231~280 GENERAL
281~400 PURPOSE

4VX-5-1A2

5–25~150

6151~230

78231~280 EARTHQUAKE
PROOF
281~400 (3G) TYPE

A

–25~150

AC250V, 5A
DC5V
DC125V, 0.4A 160mA

04

14

AC250V, 1A
DC5V
DC125V, 0.4A 20mA

1121AC250V, 5A
DC5V
DC125V, 0.4A 160mA

0212TZ-1GV

AC250V, 1A
DC5V
DC125V, 0.4A 20mA

112111SM244

AC250V, 5A
DC5V
DC125V, 0.3A
100mA
DC30V, 5A

V5-1A3T

SPDT

TZ-1GV
VX-5-1A2B 151~280

OMRON

V5-1A3T

2SPDTSPDTEF

I–25~150
151~200K–25~150

151~230 EARTHQUAKE
PROOF
M –25~150 (3G) TYPE
N 151~230

AC125V, 0.1A DC5V1mA
DC30V, 0.1A

0212AC250V, 5A
DC5V
DC125V, 0.3A
100mA
DC30V, 5A

0211*1

21AC125V, 0.1A DC5V
DC30V, 0.1A
1mA

0212

VX-5-1A202

V5-1A3T

12CODELEAD PIPE MATERIAL

024SUS304

126Z–SPECIAL

SUS316––Z

OTHERS

VX-5-1A22SPDTINTRINSICALLY SAFE EX-PROOF (Ex ia IIC T6)

1Azbil11SM244SPDT

PRESSURE TIGHT EX-PROOF (Ex d IIC T6)

S

22SPDT
SSM13A0(GOLD PLATED)LEX

2H 281~350
J

WATERTIGHT (IP65EQU.)

1*1SPDT
SSM13A0
151~200 HERMETIC (GOLD PLATED)
SEAL–25~150TYPE
2SPDT

ENCLOSUREW

1–25~150

G 151~280

CODE

0C 281~350
D

2 ENCLOSURE

OMRON

DC5V
AC250V, 5A
DC125V, 0.4A 160mA

V5-1A3T–––––

3 NUMBERS OF ALARM
CODE

NUMBER OF ALARM

11 POINT

22 POINTS

33 POINTS

44 POINTS

Refer to MODEL CODE 1 .

6 LEAD PIPE MATERIAL*: For applications with lower temperature than –26˚C, an extension unit will be added and theexternal dimension will be different from the standard versions. Consult factory for details.
*: Applicable alarm of interface detection is 1 point.
*1: 230˚C or less are 2 points.

4 PRESSURE RATING

7 DISPLACER MATERIALPRESSURE RATINGCODEDISPLACER MATERIAL

110K(150#) Class

6SUS316 (Standard)

220K(300#) Class

4SUS304

330K(600#) ClassL

SUS316L

4HIGH PRESS. APPLICATIONZOTHERSZOTHERSCODE

5 TOP FLANGE MATERIALCODETOP FLANGE MATERIALSCARBON STEEL

4SUS304

6SUS316

LSUS316L

ZOTHERS

8 SPRING MATERIAL
CODESPRING MATERIAL

6SUS316 (Up to 230°C)

ZInconel (above 230°C) ** Another special material, UNS N10276(equivalent to Hastelloy C276), is also available.

4TOKYO KEISO CO., LTD.

TG-L2291-E00

2FS-100 DISPLACER, LEVEL SWITCH

Alarm
Contact Material

3456Connection

78910Chamber

1112131414 UPPER GASKET MATERIAL
CODE

UPPER GASKET MATERIAL

0CUSTOMER'S SCOPE(CHAMBER NOT PROVIDED)

4VORTEX GASKET (SUS304)

6VORTEX GASKET (SUS316)

Z

OTHERS

Bolts, nuts and gaskets for process connection are
to be supplied by the customer.

13 EXTERNAL CHAMBER CONNECTION

9 TOP FLANGE SIZE

CODE

EXTERNAL CHAMBER CONNECTION

0CHAMBER NOT PROVIDED

11"SW

2Rc1

31"FLANGEZOTHERS

12 CAMBER MATERIAL

CODETOP FLANGE SIZE

CODE

CHAMBER MATERIAL

380mm(3")

0CHAMBER NOT PROVIDED

4100mm(4")

S

Carbon steel

5125mm(5")

4SUS304

6150mm(6")

6SUS316

ZOTHERS

LSUS316L

ZOTHERS

10 TOP FLANGE SIZE RATING
CODETOP FLANGE SIZE RATING0JIS10KFF

1JIS10KRF

CODECHAMBER CONTRUTION

2JPI#150

0NOT PROVIDED

3ANSI#150

1INTERNAL, WELDING TYPE(FIG.A)

4JIS20KRF

2INTERNAL, INSERSION TYPE(FIG.B)

5JPI#300

3EXTERNAL, SIDE~SIDE (FIG.C)

6ANSI#300

4EXTERNAL, SIDE~BOTTOM (FIG.D)Z

OTHERSZOTHERS

TG-L2291-E00

11 CHAMBER CONSTRUTIONTOKYO KEISO CO., LTD.

5FS-100 DISPLACER, LEVEL SWITCHDIMENSIONS
1. DETECTING PART

FS-101W

FS-102W

FS-103W

FS-104W
φ171

φ171

φ171

φ171

FS-101EX

427

427

377

G1/2 or
G3/4

G1/2 orG3/4477

G1/2 or
G3/4
G1/2 orG3/4

FS-102EX

FS-103EX

MAX.207

MAX.207

FS-104EX
MAX.207

φ171

MAX.207

φ171

φ171

G1/2 or
G3/46

TOKYO KEISO CO., LTD.

G1/2or
G3/4

477

G1/2or
G3/4

427

377

G1/2or
G3/4

427

φ171

TG-L2291-E00

FS-100 DISPLACER, LEVEL SWITCH

2. CHAMBERS

Internal, welding type Fig.A

Internal, Insersion type Fig.B

4" flange

L1

L1

3" flange

3"

L1: Min.500mm
L2 : Min.100mm

Alarm level

L2L2Alarm level

L1: Min.500mm
L2 : Min.100mm

External, Side to Side Fig.C

External, Side to Bottom Fig.D

3" flange

L1

L1500 (standard)

500 (standard)3" flange

Alarm level
L2

L1: Min.100mm
L2 : Min.150mm

100

L1: Min.100mm
L2 : Min.100mm

L2Alarm level

3. DISPLACER

A standard displacer for detecting the level of liquid equivalent
to water at normal temperature(ρ = 1.0 g/cm3).
Dimension may differ for lower
density liquid, interface detection and liquid temperature.

TG-L2291-E00

TOKYO KEISO CO., LTD.

7

FS-100 DISPLACER, LEVEL SWITCHORDERING INFORMATION
Please notify the follow for order / inquiry :TAG NO.
FS-10◻◻-◻-◻◻◻◻◻-◻◻-◻◻◻◻

MODEL
Q'TY

For liquid level detection

LIQUID NAMEGas:

For two liquids interface detection

Upper:

Lower:

Gas:

Liquid:Upper:

Lower:For liquid level detection
DENSITY

For two liquids interface detection

Liquid:(Difference of at least 0.2 g/cm3 required. Only 1 point for alarm.)
PRESS.

Nor.

Max.

◻MPa◻()

TEMP

Nor.

Max.

◻˚C◻()◻ 2 points alarm◻ 3 points alarm

ALARM POINT, SETTING, INSTRUCTION◻ 1 point alarmh1h1h1mmh2◻ High ◻ Lowmm

High◻ High ◻ Lowmm◻ 4 points alarm

h1mmmmh2High◻ High ◻ Lowh2mm◻ High ◻ Low
h3mm

Highmmh3mm

Lowh4mm

Low

Low

Limitation of alarm setting point is applicable due to technical reason. Refer to Page 3 for details.
◻ Internal insertion type

◻ External, Side to Side

◻ External, Side to Bottom

:◻

:◻

:◻

CHAMBER◻ Not required ◻ Internal welding type:◻

mmmmmmmm

OTHER SPECIALFEATURES
ANDINSTRUCTION* Specification is subject to change without notice.

Head Office : Shiba Toho Building, 1 – 7 – 24 Shibakoen, Minato-ku, Tokyo 105 – 8558
Tel : +81-3 – 3431 – 1625 (KEY) ; Fax : +81-3 – 3433 – 4922
e-mail : overseas.sales@tokyokeiso.co.jp ; URL : http://www.tokyokeiso.co.jp
8TG-L2291-E00