MBA Instruments MLA 900 Operating Instruction

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Title

MLA 900 Conductivity meter for light petroleum products

Operation Maintenance Approvals

Operating Instructions

Page 2

Document information

Document ID

Title: Operating Instructions MLA 900 Order No.: 8011381 Version: 2.0 Status: 2010-06

Subject

Product name: MLA 900 Software: Version 1.1

Manufacturer

MBA Instruments GmbH Friedrich-List-Str. 7 · D-25451 Quickborn · Germany Phone: +49 (0) 41 06 123 888-0 Fax: +49 (0) 41 06 123 888-9 E-Mail: [email protected]

Trademarks

IBM is a trademark of the International Business Machine Corporation. MS-DOS and Windows are trademarks of the Microsoft Corporation. Other product names used in this document may also be trademarks and are only used for identification purpose.

Warning symbols

Hazard (general)

Hazard in explosion-hazardous locations

Hazard by explosive substances/mixtures

Warning levels / signal words

GEFAHR

Immediate hazard which will result in serious injury or death.

WARNUNG

Risk or hazardous situation which could result in serious injury or death.

VORSICHT

Hazard or unsafe practice which may result in minor or moderate personal injury.

NOTICE

Hazard or unsafe practice which could result in property damage.

Information symbols

Important technical information for this product

Nice to know

Supplementary information

Link to information at another place

Operating Instructions 8011381 V2.0 © MBA Instruments GmbH

Page 3

Contents

1 For your own safety … . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.1 General safety in hazardous locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.2 Essential safety notes for the MLA 900 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2 Notes on application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.1 Approved use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.1.1 Designated use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.1.2 Application restrictions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.1.3 Regulations and standards fulfilled. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.2 Official approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.2.1 Definitions of terms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.2.2 Approval for the MLA 900 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3 Preparing for operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

3.1 Supply schedule. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3.2 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4 Handling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.1 Display unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4.1.1 Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4.1.2 Switching on and off. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4.1.3 Measuring value displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4.2 Fault/limit value displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

4.3 Performance test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

4.4 Measuring procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

4.5 Measures in the event of a fault/damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

5 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

5.1 Cleaning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.1.1 Cleaning the probe cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.1.2 Cleaning the measuring probe. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

5.1.3 Cleaning the display unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.2 Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

5.3 Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

6 Storage, transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

6.1 Correct storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

6.2 Short-distance transports. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

6.3 Correct shipping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

6.4 Shipping for repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

7 Approval certificate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

MLA 900 Operating Instructions V 2.0 8011381 © MBA Instruments GmbH 3

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Contents

4 MLA 900 Operating Instructions V 2.0 8011381 © MBA Instruments GmbH

Page 5

For your own safety …

MLA 900

1 For your own safety …

General safety

Essential safety notes

MLA 900 Operating Instructions V 2.0 8011381 © MBA Instruments GmbH 5

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For your own safety …

1.1

General safety in hazardous locations

WARNUNG:

Before using the instrument for the first time in a hazardous location: Observe all the safety instructions in these operating instructions.

1.2 Essential safety notes for the MLA 900

Observe the following safety notes when assembling and operating the instrument, during maintenance and repair, and when exchanging parts – for your own protection.

The most important safety rules are:

VORSICHT: Risk of wrong measurements

Before using the MLA 900: carry out a performance test (→S. 21, §4.3) – always to be done outside of the hazardous locations.

WARNUNG: Hazard when potential equalisation is missing:

Before the measuring probe is lowered into the liquid container: Safely connect the ground clamp of the display unit with the liquid container (potential equalisation).

WARNUNG: Hazard when enclosure is open

Never open the instrument enclosure as long as it is in a hazardous location.

WARNUNG: Hazard by unsafe instrument

If there is any reason to assume that the instrument is no longer safe: shut down the instrument and protected it against unauthorised use.

6 MLA 900 Operating Instructions V 2.0 8011381 © MBA Instruments GmbH

Page 7

Notes on application

MLA 900

2 Notes on application

Designated use

Application restrictions

Official approval

MLA 900 Operating Instructions V 2.0 8011381 © MBA Instruments GmbH 7

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Notes on application

2.1

2.1.1 Designated use

Approved use

Measuring function

The MLA 900 determines the electrical conductivity and the temperature of petroleum products such as occur, for example, in aviation fuels and in other petroleum products.

During the filling process, pumping or filtering, these liquids may become electrostatically charged. If, in addition, there is an inflammable gas mixture present in the ambient atmosphere, there is a danger that the gas mixture will be ignited by a discharge spark, which means that it may explode. To evaluate this risk, the electrical conductivity of the liquid is measured (see German standard DIN 51 412-T02-79, »Determining electrical conductivity, field procedure«).

The conductivity is stated in the physical unit »pS/m« (picosiemens per meter). This unit corresponds to »c.u.« (conductivity unit), which is still commonly used in the petroleum industry:

Ambient conditions

The MLA 900 is designed as a measuring instrument for outside use.

Use the MLA 900 at an ambient temperature of –20 °C … +60 °C (–4 … +140 °F).

Outside this temperature range it can no longer be guaranteed that the instrument will function correctly.

1c.u.=

● At temperatures above +60 °C (140 °F) there is a danger that caustic liquid

from the battery may escape and damage the electronics. Apart from this, the LC displays may be damaged (irreversible blackening).

● At temperatures of below –20 °C (–4 °F), the LC displays in the display unit

may freeze, resulting in the LC display enclosure bursting.

● Low temperatures affect the flexibility of the probe cable.

Avoid bending the probe cables in low temperatures.

Otherwise the probe cable could brake due to the sheath becoming brittle.

2.1.2 Application restrictions

The MLA 900 may only be used to measure the conductivity and temperature of petroleum products, such as petrol, kerosene and oils/greases. Other liquids such as acids or solvents containing chlorinated hydrocarbons, for example, can damage the measuring probe.

component clean with avoid contact with

measuring probe probe cables

petrol spirit (ethanol) isopropanol

acids chlorinated hydrocarbons (CHC) methanol acetone

8 MLA 900 Operating Instructions V 2.0 8011381 © MBA Instruments GmbH

Page 9

Notes on application

2.1.3

Regulations and standards fulfilled

The MLA 900 measuring procedure corresponds to:

● German standard DIN 51 412-T02-79 (»Determining electrical conductivity, field

procedure«)

● ASTM 02624 »Standard Test Methods for Electrical Conductivity of Aviation and

Distaillate Fuels«

The technical design of the MLA 900 corresponds to:

● European standard EN 60079-0:2006

● European standard EN 60079-11:2007

● European standard EN 60079-26:2007

● European Council Directrive 94/9/EC (ATEX guideline)

● German »Ordinance on electrical appliances in hazardous locations« (»Verordnung

über elektrische Anlagen in explosionsgefährdeten Räumen«, ElexV) of 13 December

1996.

2.2 Official approval

2.2.1 Definitions of terms

● An explosive mixture is a mixture of gases, vapours, mists or dusts in which a reaction

continues independently after ignition.

● An explosive atmosphere contains explosive mixtures of gases, vapours, mists or dusts

with air, including usual admixtures (for example, humidity) under atmospheric conditions. Atmospheric conditions are here defined as total pressures of 0.8 to 1.1 bar and gas mixture temperatures of from –20 °C to +60 °C.

A dangerous explosive atmosphere occurs when in the event of an ignition injury may be caused to persons as a direct or indirect result of the explosion.

● Hazardous locations are those areas in which a dangerous explosive atmosphere may

occur due to local and operational conditions. Hazardous locations are divided into zones on the basis the probability (in terms of time

and place) of the presence of dangerous explosive atmospheres: – Zone 0 includes areas in which a dangerous explosive atmosphere is present

»constantly or for longer periods«; for example, in tank facilities.

– Zone 1 covers areas in which a dangerous explosive atmosphere »occasionally«

occurs; for example, in the vicinity of refuelling nozzles.

MLA 900 Operating Instructions V 2.0 8011381 © MBA Instruments GmbH 9

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Notes on application

2.2.2

Approval for the MLA 900

Approved area of application

The MLA 900 is approved for use in hazardous locations in which inflammable gases, vapours or mists may occur (EEx ia IIB T6). The MLA 900 measuring probe is approved for use in Zone 0, the display unit for use in Zone 1.

Prescribed operating conditions

The following applies for the use of the MLA 900 conductivity meter in the area of application as defined in the »Ordinance on electrical appliances in hazardous locations (ElexV)«:

WARNUNG: Hazards in explosions-hazardous locations

● The MLA 900 is intended exclusively for mobile use at different locations.

● The measuring probe of the MLA 900 is approved for use in containers for

inflammable liquids (Hazardous Location Zone 0).

● The display unit of the MLA 900 may only be used in Hazardous Location

Zone 1.

● The measuring probe may only be used in such liquids against which the

→

materials of which it is made offer adequate chemical resistance (

§2.1.2).

● Damaged measuring probes may not be used in Zone 0.

● Before the measuring probe is taken to Zone 0, all plug and threaded cable

connections must be checked.

● The measuring probe may only be used with the appropriate display unit.

● Before the measuring probe is lowered into the liquid container (tank), the

ground clamp of the display unit must be connected to the container to equalize the electric potentials.

S. 8,

Approval document →S. 36

10 MLA 900 Operating Instructions V2.0 8011381 © MBA Instruments GmbH

Page 11

Preparing for operation

MLA 900

3 Preparing for operation

Supplied parts

Assembly

MLA 900 Operating Instructions V 2.0 8011381 © MBA Instruments GmbH 11

Page 12

Preparing for operation

Nr.: 930XXX

PTB02ATEX2201X

3.1

Supply schedule

When delivered, the MLA 900 consists of:

● display unit with ground clamp

● measuring probe

● probe cable, 2 m long

● probe cable, 10 m long

● transport case

VORSICHT: Risk of damage

● Tight bending may damage the cable (cable breaks).

● Damaged cables must not be used in hazardous locations.

Never buckle the probe cable and do not bend the cables too far.

At temperatures below 0 °C (32 °F), treat the probe cable with particular care – because the cable sheath may become brittle at these temperatures. Avoid tight bending (risk of breakage).

Bild 1 MLA 900 supply schedule

ground clamp

● Keep the transport box even if you do not wish to use it when operating the

● List of spare parts

display unit

probe cable

MLA 900. It may be useful as a shipping packaging.

→

S. 30, §5.3

measuring

probe

probe cable

10 m

12 MLA 900 Operating Instructions V2.0 8011381 © MBA Instruments GmbH

Page 13

Preparing for operation

Nr.: 930XXX

PTB02ATEX2201X

3.2

Assembly

The MLA 900 consists of four instrument components (measuring probe, display unit, ground clamp, probe cables). – Note: These components will only conform to the technical safety regulations for the petroleum industry when used as an assembled unit.

Measuring probe and display unit are a matching pair

Display unit and measuring probe have been individually adapted in the factory. If a different probe is connected, the measuring accuracy cannot be guaranteed.

Only connect a measuring probe to a display unit with the identical serial number on it.

Probe cables

Connect the display unit to the measuring probe with one of the probe cables supplied. (Choose the cable length which is the best for the application.)

You can also connect the probe cables to each other to have a 12 m length of cable. Greater cable lengths can be obtained by using further cable sections

→

(order designations The maximum allowable total cable length is 24 m.

WARNUNG: Risk by wrong equipment

Use only use cables of the type supplied to connect the display unit and the measuring probe.

It is not permitted to operate the instrument with other cables in hazardous locations.

Ground clamp

Make sure that the ground clamp is firmly attached to the display unit (threaded connections, cable lugs).

Do not start up the MLA 900 if this is not sure.

S. 30, §5.3).

Bild 2 Connecting the probe cable

MLA 900 Operating Instructions V 2.0 8011381 © MBA Instruments GmbH 13

Page 14

Preparing for operation

14 MLA 900 Operating Instructions V2.0 8011381 © MBA Instruments GmbH

Page 15

Handling

MLA 900

4 Handling

Instrument display

Performance test

Measuring procedure

MLA 900 Operating Instructions V 2.0 8011381 © MBA Instruments GmbH 15

Page 16

Bild 3 Display unit

Handling

OFF

Please close cover after use!

Function test: Press the serial number

of the probe to to red button

display: 1000 cu + 10 cu

CAUTION: Do NOT change battery

within the explosive areas!

temperature

measured

Temperature

light

sensor

Nach Gebrauch Deckel schlieen!

Funktionstest: Seriennummer der Sonde

an roten Testpunkt halten Anzeige: 1000 cu + 10 cu

ACHTUNG: Batteriewechsel darf NICHT

im EX-Bereich vorgenommen werden!

conductivity

measured

Conductivity

16 MLA 900 Operating Instructions V2.0 8011381 © MBA Instruments GmbH

Page 17

Handling

4.1

4.1.1 Handling

Display unit

Handling during transport

Always use the carrying handle to carry the instrument.

⊗ Do not use the cover flap or the cable brackets to carry the instrument.

Handling during measurement

During measurements, hold the display unit safely in your hand.

If you put the display unit down while measuring: make sure that it is standing securely – because it might be pulled down by the weight of the measuring probe, or even fall into the liquid container.

WARNUNG: Risks by wrong use

In hazardous locations the display unit may only be operated within »Zone 1«.

Before the measuring probe is introduced into the liquid container (tank): connect the ground clamp of the display unit to the container.

4.1.2 Switching on and off

Switching on: Open the cover flap of the display unit.

➝ The MLA 900 automatically starts up when the light sensor is exposed to light.

Switching off: Close the cover flap.

➝ When the flap is closed, the MLA 900 automatically shuts off.

4.1.3 Measuring value displays

left-hand display: right-hand display:

temperature of the measuring probe/

the liquid

Display range:

Watch out for fault and limit value indications (→S. 19, §4.2).

-199

The MLA 900 is approved for measurement in hazardous locations only in a temperature range of the MLA 900 fulfils the stated specifications.

°C … +

conductivity measured

199

°C Measuring range:0…

–20

°C … +60°C. This is the temperature range where

1999

pS/m

MLA 900 Operating Instructions V 2.0 8011381 © MBA Instruments GmbH 17

Page 18

Bild 4 Fault/limit value displays

Handling

Function test: Press the serial number

CAUTION: Do NOT change battery

battery

is almost spent

Please close cover after use!

of the probe to to red button

display: 1000 cu + 10 cu

within the explosive areas!

BAT BAT

Temperature

conductivity measured

is lower than 50 pS/m

Conductivity

– or –

fault

Nach Gebrauch Deckel schlieen!

Funktionstest: Seriennummer der Sonde

an roten Testpunkt halten Anzeige: 1000 cu + 10 cu

ACHTUNG: Batteriewechsel darf NICHT

im EX-Bereich vorgenommen werden!

measuring range

overflow

(conductivity measured

is greater than 1999 pS/m

18 MLA 900 Operating Instructions V2.0 8011381 © MBA Instruments GmbH

Page 19

Handling

4.2

Fault/limit value displays

BAT

(shown on both displays)

Meaning Measures/instructions

The life of the built-in battery is almost over.

The battery voltage is lower than 8 V (new battery: 9 V).

Replace the battery (→S. 29, §5.2).

▲~

Meaning Measures/instructions

The measuring probe is outside the liquid.

The conductivity of the sample solution is

lower than

▲~

xxx + constantly changing temperature measuring valuet

Meaning Measures/instructions

The probe cable is broken.

Measuring probe is badly contaminated or moist (splashed with water).

pS/m.

Immerse the measuring probe in the liquid.

Observe the safety rules and carry out the measures laid down for this case.

Carry out a performance test (→S. 21,

§4.3).

If unsuccessful: change the probe cable. Then carry out another performance test.

Clean and dry the measuring probe

→

S. 27, §5.1).

(

WARNUNG: Risk by damaged cable

Do not operate the instrument in hazardous locations if the probe cable is damaged or defective.

Only change the probe cable outside hazardous locations.

Meaning Measures/instructions

Measuring value is greater than

1999

Measuring probe is badly contaminated or moist (splashed with water).

MLA 900 is damaged.

pS/m.

Check whether the conductivity of the liquid can actually be greater than 1999 pS/m.

Clean and dry the measuring probe

→

S. 27, §5.1).

(

Carry out a performance test (→S. 21,

§4.3).

MLA 900 Operating Instructions V 2.0 8011381 © MBA Instruments GmbH 19

Page 20

Bild 5 Performance test

Nr.: 930XXX

PTB02ATEX2201X

Handling

Please close cover after use!

Function test: Press the serial number

of the probe to to red button

display: 1000 cu + 10 cu

CAUTION: Do NOT change battery

within the explosive areas!

MLA 900

Temperature

Nach Gebrauch Deckel schlieen!

Funktionstest: Seriennummer der Sonde

an roten Testpunkt halten Anzeige: 1000 cu + 10 cu

min.

ACHTUNG: Batteriewechsel darf NICHT

im EX-Bereich vorgenommen werden!

max.

Conductivity

20 MLA 900 Operating Instructions V2.0 8011381 © MBA Instruments GmbH

Page 21

Handling

4.3

Performance test

VORSICHT: Risk of wrong measurements

Always make a performance test before operating the MLA 900.

Perform this performance test outside hazardous locations.

Check condition of instrument

1 Make sure that

– the cylinder of the measuring probe is tightly screwed on – the measuring probe is sufficiently clean and dry – display unit and measuring probe are correctly connected to each other (inspect

cables and plug connectors).

Check basic condition

2 Open the cover flap of the display unit in order to switch on the MLA 900. Let the

measuring probe hang free in the air. ➝ The conductivity value measured should then read

If a value above 2pS/m is displayed: carefully clean the measuring probe (→S. 27,

§5.1).

If a value below

Check measuring function

3 Hold the surface of the measuring probe with the company logo close to the red disc on

the display unit. ➝ The MLA 900 should display

If the value is not between

-2

pS/m is displayed: check the battery (→S. 29, §5.2).

1000

990

pS/m (±10 pS/m).

and

1010

-2…2

pS/m: check the battery (→S. 29, §5.2).

pS/m.

A re-calibration (a new adaptation of measuring probe and electronics) is usually not required. If it is however necessary, this work must be made at the manufacturer's factory, for safety reasons. Please observe the transport

→

instructions before shipping the instrument (

S. 31, §6).

MLA 900 Operating Instructions V 2.0 8011381 © MBA Instruments GmbH 21

Page 22

Bild 6 Measuring procedure

Handling

Please close cover after use!

Function test: Press the serial number

of the probe to to red button

display: 1000 cu + 10 cu

CAUTION: Do NOT change battery

within the explosive areas!

Temperature

Nach Gebrauch Deckel schlieen!

Funktionstest: Seriennummer der Sonde

an roten Testpunkt halten Anzeige: 1000 cu + 10 cu

ACHTUNG: Batteriewechsel darf NICHT

im EX-Bereich vorgenommen werden!

Conductivity

22 MLA 900 Operating Instructions V2.0 8011381 © MBA Instruments GmbH

Page 23

Handling

4.4

Measuring procedure

Checking the instrument

Measuring probe safely connected to

1. the probe cable?

Cylinder of the measuring probe tightly

2. screwed on

3. Measuring probe sufficiently clean?

Connection of ground clamp and display

4. unit in perfect condition?

Measuring

Hold the display unit in your hand or use the transport case for holding the display unit (do not put the display instrument down!).

1 Connect the ground clamp: Attach the ground clamp to a metallic, unpainted, rust-free

and grease-free point on the liquid container. Make sure that there is a good metallic connection between the liquid container and the display unit.

WARNUNG: Explosion risk

Do not lower the measuring probe into the liquid container before the ground clamp is safely connected to the container.

2 Immerse the measuring probe: Take the measuring probe and the probe cables out of

the bracket on the display unit and lower the measuring probe, hanging from the cable, carefully into the liquid.

3 Measure: Open the cover flap of the display unit and read the measuring values. Note:

So that the measuring probe won’t get lost in the liquid container.

Otherwise wrong measurements and/or faults could occur (

→

S. 19, §4.2).

Contamination results in wrong measuring

→

results (cleaning

S. 27, §5.1).

Otherwise safety is not guaranteed.

Make sure that the measuring probe is completely filled with liquid. Air bubbles would distort the measuring result.

If possible, measure the conductivity just when the desired immersion depth is reached, or move the measuring probe constantly while

measuring.

Wait for the final temperature reading until the temperature display remains approximately constant.

Please consider: there can be different temperatures at different

depths.

If the measuring probe is resting in the liquid, the conductivity measuring value will slowly change, due to unavoidable electrochemical effects (ionic migration, polarisation, surface effects).

This takes about 30 seconds after the immersion; you can speed-up this by constantly moving the measuring probe.

Finishing the measurement

1 Switch off the MLA 900: Close the cover flap of the display unit. 2 Remove the measuring probe: Pull in the measuring probe carefully out of the liquid

container (recommendation: wipe the probe cable when pulling out and dry with a soft cloth). Stow the cables and measuring probe in the brackets of the display unit.

3 Stow away the ground clamp: Detach the ground clamp and attach it to the underside

of the display unit.

MLA 900 Operating Instructions V 2.0 8011381 © MBA Instruments GmbH 23

Page 24

Handling

4.5

Measures in the event of a fault/damage

WARNUNG: Risks caused by damage

If a fault or damage to an instrument component is detected, the MLA 900 must not be taken into a hazardous location.

If the MLA 900 is faulty or damaged:

Mark the instrument clearly as faulty (for example, using a sticker).

Make sure that the MLA 900 is no longer used in hazardous locations.

WARNUNG: Risk caused by damaged measuring probe

If the cylinder of the measuring probe is deformed (for example, partly dented), the conductivity measuring values will be distorted. This fault may not be detected

→

during a performance test (

Check the mechanical condition of the measuring probe.

If the MLA 900 is faulty of damaged: send both the display unit and the measuring probe to the manufacturer's factory for repair (detailed information

S. 21, §4.3).

→

S. 13, §3.2).

24 MLA 900 Operating Instructions V2.0 8011381 © MBA Instruments GmbH

Page 25

Maintenance

MLA 900

5 Maintenance

Cleaning

Battery replacement

Spare parts

MLA 900 Operating Instructions V 2.0 8011381 © MBA Instruments GmbH 25

Page 26

Bild 7 Surfaces of the measuring probe sensitive to contamination

Nr.: 930XXX

PTB02ATEX2201X

Maintenance

26 MLA 900 Operating Instructions V2.0 8011381 © MBA Instruments GmbH

Page 27

Maintenance

5.1

Cleaning

WARNUNG: Hazard in explosion-hazardous locations

Perform any cleaning works only outside hazardous locations.

5.1.1 Cleaning the probe cable

To clean the probe cable, use a soft cloth moistened with spirits or any other mild solvent (

Make sure that dirt and solvent residue are completely removed.

5.1.2 Cleaning the measuring probe

→

S. 8, §2.1.2).

1 Unscrew the cylinder of the measuring probe.

If you are not able to detach the cylinder by hand: try using the two pins on the underside of the display unit which fit into the cylinder face.

VORSICHT: Damage risk

⊗ Do not fix the measuring probe’s body or cylinder in a vice.

The pressure from the vice could burst the plastic material in the probe body. Deformations in the cylinder will cause wrong measuring results.

2 Clean all surfaces of probe body and cylinder carefully with a soft cloth moistened with

→

a »mild« solvent (

S. 8, §2.1.2).

The quality of your next measurement depends on how clean the parts of the probe are.

VORSICHT: Damage risk

Only use solvents which cannot have an aggressive effect on the measuring probe materials (

Make sure that the plastic material is not scratched. Any dirt collecting in such scratches may affect measuring results.

Do not use measuring probes in hazardous locations which have been damaged or attacked by aggressive solvents.

5.1.3 Cleaning the display unit

Regularly clean the enclosure of the display unit with a soft cloth moistened with a mild cleaning agent or solvent.

Use only solvents which cannot attack the enclosure or the print on the display unit (

→

S. 8, §2.1.2).

VORSICHT: Risk by damage parts

If the display unit enclosure has been attacked by solvents: Do not put the MLA 900 into operation.

→

S. 8, §2.1.2).

MLA 900 Operating Instructions V 2.0 8011381 © MBA Instruments GmbH 27

Page 28

Figure 8: Changing the battery

Maintenance

28 MLA 900 Operating Instructions V2.0 8011381 © MBA Instruments GmbH

Page 29

Maintenance

5.2

Battery

Check

When the life of the built-in battery comes to an end, the message display.

Whenever you open the display unit, check if

HINWEIS: Risk of damage by leaking battery

Caustic liquid could escape from the spent battery and could damage the electronics of the display unit.

Remove a spent battery as soon as possible.

Replace the built-in battery at the latest after 3 years.

Note in a suitable place when the battery was last replaced.

Replacing the battery

WARNUNG: Risks in explosion-hazardous locations

When using the MLA 900 in hazardous locations, use only batteries of the

→

original type (

S. 30, §5.3).

BAT

is indicated.

⊗ Never open the enclosure inside a hazardous location.

1 Undo the 8 screws at the rear of the display unit. 2 Lift the upper section of the enclosure on the left-hand side.

➝ The battery is located in the lower section.

3 Detach the battery cable from the electronics (pin-and-socket connector) and remove

the battery.

4 Check the enclosure seal.

If the seal is damaged: replace the seal (spare parts →S. 30, §5.3).

5 Insert the new battery and connect the battery cable. 6 Screw the enclosure back together. Make sure

– that the enclosure seal is correctly positioned – that no cables are pinched.

7 Carry out a performance test (

performance test after battery replacement outside hazardous locations.

→

S. 21, § 4.3) – Caution: for safety reasons, make this first

BAT

is indicated on the

Page 30

Maintenance

5.3

Spare parts

Part No. Description Remark

consists of: display unit, measuring probe,

1025073 MLA 900, complete

2028594 measuring probe MLA900

6026885 cable, 2 m

6026886 cable, 10 m

2028595 battery, MBA type

2028595 ground clamp

5316999 permanent magnet disc on display unit; used for performance test

4039227 seal seal for display unit enclosure

4038445 transport case

Display unit and measuring probe have been individually adapted in the factory. If you connect a different probe, the measuring accuracy cannot be guaranteed.

Only connect the measuring probe to the display unit with the identical serial number on it.

If only the measuring probe or the display unit has become unusable or has been lost, you can send the remaining part to the manufacturer's factory and have this made back into a complete MLA 900.

ground clamp (with cable), 2 m cable, 10 m cable; without transport case

Page 31

Storage, transport

MLA 900

6 Storage, transport

Storage

Shipping notes

Page 32

Storage, transport

6.1

Correct storage

Please observe these instructions if the MLA 900 is to be taken out of service for more than 3 months:

Remove the battery (→S. 29, §5.2).

Keep all the components stored in a dry place at room temperature (15 … 20 °C/ 59 … 68 °F).

Observe the admissible storage and transport temperature (–20 °C … +60 °C).

WARNUNG: Damage risks caused by wrong storage

● At lower temperatures the LC displays in the display unit may freeze,

resulting in the enclosure of the LC display bursting.

● Lower temperatures affect the flexibility of the probe cables. At low

temperatures avoid bending the probe cables too far as the cable sheath may become brittle and break.

● At higher temperatures there is a risk that caustic fluid may escape from the

battery, damaging the electronics. In addition, the LC displays may be damaged (irreversible blackening).

6.2 Short-distance transports

Wind-up both the probe cable and the ground cable onto the cable brackets of the display unit.

Attach the measuring probe and the ground clamp in the supports on the display unit – do not detach the cable connections.

Use the hand-grip to carry the instrument.

6.3 Correct shipping

If the MLA 900 is to be transported over long distances:

Secure instrument: Wind the probe cable and the cable with the ground clamp carefully onto the cable bracket of the display unit. Attach the measuring probe and the ground clamp in the brackets of the display unit.

Protect the display unit: Protect the display unit against condensation, humidity and splashing

Packing: Stow the MLA 900 in transport case supplied.

Observe the admissible storage and transport temperature (→§6.1).

If the instrument is to be sent for repair: observe the notes in §6.4 (→S. 33).

Page 33

Storage, transport

6.4

Shipping for repair

Always send both the measuring probe and the display unit together for repair (explanation

Please attach the following notes: – A detailed, clear description of the problem (single words are fine, but merely stating

that »the instrument does not work« is of little help). – A short description of the operating conditions. – The name of the our representative who is informed about the problem or with whom

you have arranged transport to the workshop. – The contact person in your company who can answer any questions that may arise. This will help to bring your instrument quickly back to perfect operation. Please add the

information even if your matter has already been discussed with our customer service or a representative.

→

S. 13, §3.2).

If only the measuring probe or the display unit has become unusable or been lost, you can send the remaining part to the manufacturer's factory and have these made back into a complete MLA 900.

Page 34

Storage, transport

Page 35

Approval certificate

MLA 900

7 Approval certificate

Page 36

Bild 9 European approval certificate, page 1 of 2

Approval certificate

Page 37

Approval certificate

Bild 10 Certificate of the European approval, page 2 of 2

Page 38

Index

Ambient conditions during operation . . . . . . . . . . . . 8

Application restrictions Approval

- definitions of terms

- European approval Approved use Area of application Assembly

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

. . . . . . . . . . . . . . . . . . . . . . . 8

. . . . . . . . . . . . . . . . . . . . . . . . 9

. . . . . . . . . . . . . . . . . . . . . . . 10

. . . . . . . . . . . . . . . . . . . . . . . . . . 8

Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

- replacing

- spare part

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Carrying handle . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Certificates Checking the instrument function Chemical Resistance Cleaning

- the display unit

- the measuring probe

- the probe cable Conductivity display

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

. . . . . . . . . . . . . . 21

. . . . . . . . . . . . . . . . . . . . . . . . 8

. . . . . . . . . . . . . . . . . . . . . . . . . . 27

. . . . . . . . . . . . . . . . . . . . . . 27

. . . . . . . . . . . . . . . . . . . . . . . . . . 27

. . . . . . . . . . . . . . . . . . . . . . . . 17

Damage (consequences) . . . . . . . . . . . . . . . . . . . . 24

Definitions of terms Deformation of the measuring probe DIN 51412 Display unit

- approval

- battery

- cleaning

- connecting the measuring probe

- handling

- performance test

- spare parts

- switching on/off Displays

- fault

- limit value

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 - 9

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

. . . . . . . . . . . . . . . . . . . . . . . . . 9

. . . . . . . . . . . 24

. . . . . . . . . . . . 13

. . . . . . . . . . . . . . . . . . . . . . . . . 21

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

. . . . . . . . . . . . . . . . . . . . . . . . . . 17

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

EEx ia IIB T6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

EIZulBergV ElexV EN (European Standards) European Standards

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 10

. . . . . . . . . . . . . . . . . . . . 9

. . . . . . . . . . . . . . . . . . . . . . . . 9

Fault (consequences) . . . . . . . . . . . . . . . . . . . . . . .24

Fault displays

. . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Ground terminal

- handling during measurement

- spare part

- testing

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

. . . . . . . . . . . . . . . 23

Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Hazardous areas

. . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Information symbols . . . . . . . . . . . . . . . . . . . . . . . . 2

Intrinsically safety

. . . . . . . . . . . . . . . . . . . . . . . . . . 9

Limit value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

Materials (chemical resistance) Measuring probe

- approval

- chemical resistance

- cleaning

- connecting the display unit

- handling during measurement

- measures in case of deformation/damage

- performance test

- spare part Measuring procedure Measuring value displays Mining ordinance

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

. . . . . . . . . . . . . . . . . . . . . . . 8

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

. . . . . . . . . . . . . . . . . . . . . . . . .21

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

. . . . . . . . . . . . . . . . . . . . . . .23

. . . . . . . . . . . . . . . . . . . . . . . . . . . 9

. . . . . . . . . . . . . . . . 8

. . . . . . . . . . . . . . . . . .13

. . . . . . . . . . . . . . . 23

. . . . . . 24

. . . . . . . . . . . . . . . . . . . . 17

Official approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Operating conditions

. . . . . . . . . . . . . . . . . . . . . . . .10

Performance test . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Preparing for operation Probe cable

- cleaning

- connection

- maximum length

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

. . . . . . . . . . . . . . . . . . . . . . 11

. . . . . . . . . . . . . . . . . . . . . . . . . .13

Page 39

Index

Regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Seal for display unit . . . . . . . . . . . . . . . . . . . . . . . . 30

Shipping Signal words Spare parts Storage Supply schedule Switching on/off Symbols (explanation)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 - 32

. . . . . . . . . . . . . . . . . . . . . . . . . . 12

. . . . . . . . . . . . . . . . . . . . . . . . . . . 17

. . . . . . . . . . . . . . . . . . . . . . . 2

Temperature

-display

- during operation

- for storage/transport

Transport

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

. . . . . . . . . . . . . . . . . . . . . . . . . . . 8

. . . . . . . . . . . . . . . . . . . . . . 32

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 - 32

Warning symbols, warning levels . . . . . . . . . . . . . . . 2

Zone 0, Zone 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Page 40

MLA 900

MBA Instruments GmbH

Friedrich-List-Str. 7

Telefon +49 (0) 41 06 123 888-0

www.mba-instruments.de · [email protected]

· D-25451 Quickborn · Germany

· Fax +49 (0) 41 06 123 888-9

8011381 (2.0) · 2010-06