190

32,5

KA 180F/00/en/06.01 (a)

52010984

Floating Switch

FTS 20

Füllstandgrenzschalter

Level Limit Switch

Détecteur de niveau

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Safety instructions

The FTS 20 floating switch may only be used as a level limit switch in suitable liquids. Improper use

may cause dangerous situations.

The instrument may only be installed, connected and commissioned by qualified and authorised

personnel, paying particular attention to:

• this compact manual

• the appropriate standards

• the statutory regulations and

• certificates (depending on version and application)

Safety symbols

Warning!

“Warning” indicates an action or procedure which, if not performed correctly, can result in injury or

a safety hazard. Read the instructions thoroughly and proceed carefully.

Note!

"Note" indicates processes which – if improperly executed – could affect operation or trigger unexpect-

ed instrument actions.

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Instrument variants

Order Code Type of switch

Initiator with switching ball for use in explosion-hazardous areas

2-wire to EN 60947-5-6 (NAMUR)

Use with isolating amplifier; hazardous explosion areas to Zone1

Cable length 5 m

52010119 With PVC cable material (for water, wastewater)

52010120 With PUR cable material (for fuels and oils)

52010121 With CSM cable material (for acids and alkalis)

Microswitch with switching ball for standard application,

3-wire, change-over contact for max. 250 V AC / 150 V DC

Cable length 5 m

52010122 With PVC cable material (for water, wastewater)

52010123 With PUR cable material (for fuels and oils)

52010124 With CSM cable material (for acids and alkalis)

Accessories

Nivotester FTL 325N Isolating amplifier

52010125 Compression gland G1A, PVC

52010126 Counter nut G1A, PVC

52010127 Weight (coated with polyamide)

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Function

An element built into the floating switch switches when a deviation in the horizontal is detected.

The switching process is triggered by the movement of a steel ball and, depending on the version,

is carried out by an inductive initiator or a microswitch.

The inductive initiator acts as a switching output and provides a switching signal to EN 60947-5-6

(NAMUR). The microswitch version is a two-way switch.

Features

• Reliable level limit detection in liquids

• Electrical connections to NAMUR for hazardous areas (to Zone 1) or change-over contact

(AC/DC) for universal standard application

• Different cable materials for different media

• Small diameter for simple installation using tapped hole G1A

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Applications

Controlling pumps and valves with one switch or signal level height or limit

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Installation

The floating switch can be installed as follows:

• The floating switch can be inserted into the tank – through a tapped hole G1A – and screwed to

the compression gland (G1A).

• If it is installed from above, use the weight.

Note!

• The fulcrum of the cable should always be horizontal.

• The cable length between the fixture and the floating body is dependent on the cable type

(see "Technical data").

• When using the weight, place an extra strain relief (e.g. a knot in the cable) behind the com-

pression gland – on the outside of the tank.

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Electrical connection

Warning!

Note the switch type.

Inductive proximity

switch with switching

ball (NAMUR)

Order codes:

52010119

52010120

52010121

Connection indication

L+ = black or brown

L- = blue

(closing when floating)

Change-over contact

(AC/DC)

Order codes:

52010122

52010123

52010124

Cable colours:

black + brown = contact open

black + blue = contact closed

(contact position when floating)

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Technical data FTS 20 (NAMUR) types: 52010119, 52010120, 52010121

Measuring system Comprising an FTS 20 floating switch and an isolating amplifier, e.g.

Endress+Hauser Nivotester FTL 325N

Switching element Inductive proximity switch with switching ball, closed when floating

Power supply 8.2 V ±2 V

Operating current <1.2 mA unswitched; >2.1 mA switched

Reverse polarity protection yes

Switching angle Switching points top/bottom ±12°, measured to the horizontal

Ambient temperature dependent on cable material; PVC, PUR and CSM: -20 … +70 °C

Ambient pressure

≤ 3 bar

Density of floating switch

≥ 0.8 g/cm

Floating body material Polypropylene (PP)

Cable material PVC, CSM: standard length 5 m, cross section 2 x 0.75 mm

PUR:

standard length 5 m, cross section 2 x 0.50 mm

Areas of application and mini-

mum cable length between

fixing and floating body

PVC: ≥ 50 mm, suitable for water, dirty water, slightly aggressive media

PUR:

≥ 100 mm, suitable for fuels, heating oils, liquids containing oil

CSM:

≥ 100 mm, suitable for acids and alkalis

Ex approval TÜV 01 ATEX 1709

Ex ingress protection

II 2G EEx ia II B T5

Ex data T5 (T

= 70 °C) T4 (T

= 70 °C)

Voltage Ci 16 V 16 V

Current Ii 52 mA 72 mA

Power Pi 180 mW 242 mW

Inductance Li 1 mH 1 mH

Capacitance Ci 153 nF 153 nF

Standards EN 60947-5-2, EN 50014:1997, EN 50020:1994

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Technical data FTS 20 (AC/DC) types: 52010122, 52010123, 52010124

Measuring system Comprising an FTS 20 floating switch

Switching element Microswitch with switching ball

Switching function Change-over contact

Switching voltage AC: max. 250 V; DC: max. 150 V

Switching current Max. 3 A (AC), max. 1 A (DC)

Switching angle Upper switching point: +25° ±6°

Lower switching point: +14° ±3°, measured to the horizontal

Ambient temperature Dependent on cable material; PVC: +5 … +70 °C, PUR and CSM: -20 … +85 °C

Ambient pressure

≤ 3 bar

Density of floating switch

≥ 0.8 g/cm

Floating body material Polypropylene (PP)

Cable material PVC, CSM: standard length 5 m, cross section 2 x 0.75 mm

PUR:

standard length 5 m, cross section 2 x 0.50 mm

Areas of application and mini-

mum cable length between

fixing and floating body

PVC: ≥ 50 mm, suitable for water, dirty water, slightly aggressive media

PUR:

≥ 100 mm, suitable for fuels, heating oils, liquids containing oil

CSM:

≥ 100 mm, suitable for acids and alkalis

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Dimensions

FTS 20 floating switch

Compression gland weight Weight

(Dimensions in mm)

135

ø29,2

G1A

SW 41

190

32,5

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