WIKA FLM-CAI Bedienungsanleitung

Operating instructions

Betriebsanleitung

Magnetostrictive level transmitter for hazardous areas,

models FLM-CAI, FLM-TAI, BLM-TAI

Magnetostriktiv-Füllstandstransmitter für explosionsgefährdete

Bereiche, Typen FLM-CAI, FLM-TAI, BLM-TAI

Mounting flange, spherical float from stainless steel, model FLM-CAI

14392029.02 08/2020 EN/DE

Operating instructions magnetostrictive level transmitter, models FLM-xAI, BLM-TAI (Ex)

Operating instructions models FLM-CAI, FLM-TAI,

BLM-TAI (Ex)

Page

3 - 36

Betriebsanleitung Typen FLM-CAI, FLM-TAI, BLM-TAI

(Ex)

Seite

37 - 70

WIKA®is a registered trademark in various countries.

WIKA®ist eine geschützte Marke in verschiedenen Ländern.

Prior to starting any work, read the operating instructions!

Keep for later use!

Vor Beginn aller Arbeiten Betriebsanleitung lesen!

Zum späteren Gebrauch aufbewahren!

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Operating instructions magnetostrictive level transmitter, models FLM-xAI, BLM-TAI (Ex) 3

Contents

1. General information 5

2. Design and function 5

2.1 Description . . . . . . . . . . . . . . . . . . . . . . . . 5

2.2 Model overview . . . . . . . . . . . . . . . . . . . . . . 6

2.3 Construction and principle of operation . . . . . . . . . . . . . . 7

2.4 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . 8

3. Safety 9

3.1 Explanation of symbols . . . . . . . . . . . . . . . . . . . . 9

3.2 Intended use . . . . . . . . . . . . . . . . . . . . . . . 9

3.3 Improper use . . . . . . . . . . . . . . . . . . . . . . 10

3.4 Responsibility of the operator . . . . . . . . . . . . . . . . . 10

3.5 Personnel qualification . . . . . . . . . . . . . . . . . . . 11

3.6 Personal protective equipment . . . . . . . . . . . . . . . . 11

3.7 Labelling, safety marks . . . . . . . . . . . . . . . . . . . 12

3.8 Ex marking . . . . . . . . . . . . . . . . . . . . . . . 12

4. Transport, packaging and storage 13

4.1 Transport. . . . . . . . . . . . . . . . . . . . . . . . 13

4.2 Packaging and storage . . . . . . . . . . . . . . . . . . . 13

5. Commissioning, operation 14

5.1 Mounting. . . . . . . . . . . . . . . . . . . . . . . . 14

5.1.1 “Screw-in body” version . . . . . . . . . . . . . . . . . 16

5.1.2 “Flange” version . . . . . . . . . . . . . . . . . . . 17

5.1.3 “Mounting on bypass” version. . . . . . . . . . . . . . . 17

5.2 Electrical connection. . . . . . . . . . . . . . . . . . . . 19

5.2.1 Connection diagram (Ex) . . . . . . . . . . . . . . . . 19

5.2.2 Cable length . . . . . . . . . . . . . . . . . . . . 20

5.2.3 Wiring with cable gland . . . . . . . . . . . . . . . . . 21

5.2.4 Wiring with M12 connector. . . . . . . . . . . . . . . . 22

5.3 Adjustment . . . . . . . . . . . . . . . . . . . . . . . 24

5.3.1 Measuring span on the level transmitter . . . . . . . . . . . 24

5.3.2 Current supply in error mode . . . . . . . . . . . . . . . 25

6. Safety-related characteristic values 26

7. Faults 28

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Operating instructions magnetostrictive level transmitter, models FLM-xAI, BLM-TAI (Ex)4

Contents

Declarations of conformity can be found online at www.wika.com.

8. Maintenance and cleaning 30

8.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . 30

8.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . 30

9. Dismounting, return and disposal 31

9.1 Dismounting . . . . . . . . . . . . . . . . . . . . . . 31

9.2 Return. . . . . . . . . . . . . . . . . . . . . . . . . 31

9.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . 31

10. Specifications 32

10.1 Model FLM-CAI . . . . . . . . . . . . . . . . . . . . . 32

10.2 Model FLM-TAI . . . . . . . . . . . . . . . . . . . . . 33

10.3 Model BLM-TAI . . . . . . . . . . . . . . . . . . . . . 34

10.4 Float . . . . . . . . . . . . . . . . . . . . . . . . . 34

Annex: EU declaration of conformity 36

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Operating instructions magnetostrictive level transmitter, models FLM-xAI, BLM-TAI (Ex) 5

1. General information

■

The magnetostrictive level transmitters described in the operating instructions have

been designed and manufactured using state-of-the-art technology. All components

are subject to stringent quality and environmental criteria during production. Our

management systems are certified to ISO 9001.

■

These operating instructions contain important information on handling the instrument.

Working safely requires that all safety instructions and work instructions are observed.

■

Observe the relevant local accident prevention regulations and general safety

regulations for the instrument’s range of use.

■

The operating instructions are part of the product and must be kept in the immediate

vicinity of the instrument and readily accessible to skilled personnel at any time. Pass

the operating instructions on to the next operator or owner of the instrument.

■

Skilled personnel must have carefully read and understood the operating instructions

prior to beginning any work.

■

The general terms and conditions contained in the sales documentation shall apply.

■

Subject to technical modifications.

■

Further information:

- Internet address: www.wika.de / www.wika.com

- Relevant data sheet: LM 20.04 (FLM-CAI)

LM 20.01 (FLM-TAI)

LM 10.05 (BLM-TAI)

2. Design and function

2.1 Description

The model FLM-CAI (with guide tube Ø 6 mm) and model FLM-TAI (with guide tube

Ø 12 mm) high-accuracy level transmitters are used for the continuous measurement

of the level of liquid media in vessels.The measurement procedure used exploits the

physical effect of magnetostriction and is largely independent of the temperature. It is used,

especially, where very precise level measurements are required, such as in the chemical

industry.

In these operating instructions, the FLM is described with cable connection on the side of

the probe head. As cable connection, an M12 cable gland (also with M16 adapter), an M12

connector or an M20 or ½ NPT female thread are possible. As a further variant, there is

an FLM with an M12 connector on the probe head cover. Model BLM-TAI can be used for

mounting to bypass chambers.

1. General information / 2. Design and function

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Operating instructions magnetostrictive level transmitter, models FLM-xAI, BLM-TAI (Ex)6

The level transmitter emits a 4 … 20 mA output signal, which is configured via buttons

within the probe head, or a digital output signal as HART®protocol.

Probe lengths of 100 mm to 6 m, as “Flex version” up to 10 m, and also various

temperature and pressure ranges are possible.

Available versions:

■

With screw-in body, welded or for step-free positioning

■

With flange process connection

■

For mounting on a bypass with magnetic float

■

With 90° angled probe head

■

With 6 mm guide tube

■

With 6 mm guide tube and short cable bushing

■

With 12 mm guide tube

This level transmitter with ATEX approval can be installed in hazardous areas that require

electrical equipment of equipment protection level Ga (zone 0), equipment protection level

Ga/Gb (zone 0/1) or equipment protection level Gb (zone 1).

The instrument is designed in accordance with the following European standards:

EN IEC 60079-0:2018 Equipment – General requirements

EN 60079-11:2012 Device protection through intrinsic safety “i“

EN 60079-26:2015 Equipment of equipment protection level (EPL) Ga

2.2 Model overview

Model Guide tube diameter in mm Installation type

FLM-CAI 6 Direct installation

FLM-TAI 12 Direct installation

BLM-TAI 12 Bypass mounting

2. Design and function

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Operating instructions magnetostrictive level transmitter, models FLM-xAI, BLM-TAI (Ex) 7

2.3 Construction and principle of operation

The construction of the level transmitter is illustrated in the version with screw-in body. In

the probe head of the level transmitter are located the connection terminals and the

adjustment buttons protected by the cover .The electrical connection is made via an

M16 x 1.5 cable gland or M12 plug connection on the top of the probe head and the

ground connection at the bottom of the probe head (see chapter 5.1 “Mounting” and 5.3

“Adjustment”).

On the guide tube , for highly-adjustable mounting in the vessel, there is a screw-in

body (compression fitting) or, for fixed mounting, a flange (not shown).The float is

used for the continuous measurement of the product filling height or interface layer and is

held on the guide tube by an adjusting collar .

The “BLM for bypass mounting” version is delivered without process connection and float.















2. Design and function

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Operating instructions magnetostrictive level transmitter, models FLM-xAI, BLM-TAI (Ex)8

The measurement procedure shown in the following figure exploits the physical effect of

magnetostriction and is largely independent of the temperature. In the guide tube, a wire 

from magnetostrictive material is stretched. Via the sensor electronics, current pulses 

are sent through the wire, which generate a circular magnetic field . A magnet , which

is built into the float, acts as the level pick-up. Its magnetic field magnetises the wire axially.

Through the interference of the two magnetic fields, in the area of the float magnet, a

torsion wave is generated, which runs in both directions along the wire. One wave runs

directly to the probe head, the other is reflected off the lower end of the guide tube.The

time between the sending of the current pulse and the arrival of the wave at the probe head

is measured. From the time elapsed, the float position is determined.

2.4 Scope of delivery

Cross-check scope of delivery with delivery note.











2. Design and function

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Operating instructions magnetostrictive level transmitter, models FLM-xAI, BLM-TAI (Ex) 9

3. Safety

3.1 Explanation of symbols

DANGER!

... indicates a directly dangerous situation resulting in serious injury or death, if

not avoided.

WARNING!

... indicates a potentially dangerous situation that can result in serious injury or

death, if not avoided.

CAUTION!

... indicates a potentially dangerous situation that can result in light injuries or

damage to property or the environment, if not avoided.

DANGER!

... indicates a potentially dangerous situation in the hazardous area that can

result in serious injury or death, if not avoided.

Information

... points out useful tips, recommendations and information for efficient and

trouble-free operation.

3.2 Intended use

Magnetostrictive level transmitters are used exclusively for the continuous measurement of

the level of liquid media in vessels.

The level transmitters are designed as intrinsically safe equipment and are suitable for use

in hazardous areas. All level transmitters can be used for all gases of group IIA, IIB and IIC.

In addition, all level transmitters may be used for the dust groups IIIA, IIIB and IIIC.

If a non-conductive plastic float is to be used in hazardous areas with gases of group IIC,

the danger due to static charging must be prevented. Observe the following conditions:

■

The float must not be used in strongly flowing, non-conductive liquids.

■

There must be no stirrer in the tank.

■

Frictions on non-conductive components must be avoided.

■

The float must not be cleaned dry.

3. Safety

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Operating instructions magnetostrictive level transmitter, models FLM-xAI, BLM-TAI (Ex)10

The instrument has been designed and built solely for the intended use described here,

and may only be used accordingly.

The manufacturer shall not be liable for claims of any type based on operation contrary to

the intended use.

3.3 Improper use

Improper use is defined as any application that exceeds the technical performance limits.

WARNING!

Injuries through improper use

Improper use of the instrument can lead to hazardous situations and injuries.

▶

Refrain from unauthorised modifications to the instrument.

Any use beyond or different to the intended use is considered as improper use.

Do not use this instrument in safety or emergency stop devices.

3.4 Responsibility of the operator

The instrument is used in the industrial sector.The operator is therefore responsible for

legal obligations regarding safety at work.

The safety instructions within these operating instructions, as well as the safety, accident

prevention and environmental protection regulations for the application area must be

maintained.

To ensure safe working on the instrument, the operating company must ensure:

■

that suitable first-aid equipment is available and aid is provided whenever required.

■

that the operating personnel are regularly instructed in all topics regarding work safety,

first aid and environmental protection and know the operating instructions and, in

particular, the safety instructions contained therein.

■

that the instrument is suitable for the particular application in accordance with its

intended use.

3. Safety

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