Citizen MB Series Operating Manual

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Contents

1. Application ................................................................................................ 3

2. Structure And Principle Of Operation .......................................................4

3. Key Description.........................................................................................5

4. Unpacking And Setting Up The Moisture Analyzer .................................. 6

5. Turn Moisture Balance On........................................................................7

6. Maintenance ............................................................................................. 7

7. Preparation Samples To Drying ...............................................................8

8. Choice Parameters Of Drying...................................................................9

9. Control Reliability Of Temperature Annunciators ...................................10

10. Programming Parameters Of Drying ....................................................10

11. Procedure Of Drying .............................................................................18

12. Directions For Using .............................................................................21

13. Optimum Parameters For Moisture ......................................................22

14. Procedure Of Calibration ......................................................................23

15. Check Correctness Of Working ............................................................24

16. Additional Equipment For Moisture Balances ......................................25

17. Technical Parameters...........................................................................26

17.1. Dimensions ................................................................................. 27

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1. APPLICATION

The MB 200 moisture analyzer is a precision device for the
determination of moisture content in small samples of materials by
drying the sample with halogen heaters.

The moisture analyzer is easy to use. The user sets the drying
parameters into memory, puts the samples into the weighing chamber
then starts the test. The temperature of drying is automatically regulated
and the results, elapsed time, current temperature in the chamber and
the mode are displayed during the test. The user is told when the test
has automatically stopped either due to the sample being dry and the
weight no longer changes or the elapsed time has reached the limit the
user has set. The final values are held on the display until the user
resets the balance.

The balance can be interfaced to a printer on computer. The output will
show the results as the test progresses and after the test is finished a
summary of the test can be sent to a PC or printer.

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The following data is output: over the RS-232 interface at the end of the
test:

1. Test mode

2. Percentage moisture or percentage solids

3. Initial mass (mg)

4. Final mass (mg)

5. Drying temperature (ºC)

6. Elapsed drying time (sec)

7. Time interval between two successive measurements (sec)

2. STRUCTURE AND PRINCIPLE OF OPERATION

Moisture balance consist of precise laboratory balance and connected
drying chamber what enables to get stable temperature during
measurement. This kind of structure makes different way of moisture
measurement possible.

PRINCIPLE OF OPERATION:

• Weighing tested sample: before, during and after drying

• Automatic finish measurement when water evaporate completelly

(drying to get constance mass) or when settled time of drying

passes (drying in assumed time)

• Counting results of drying according to formula for assumed work

• Sending measure data to printer or computer when it’s neccesary

to make documentation of measurement

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The front panel of the MB 200.

There are 4 display areas, Temperature, Time, Mode and the Main
Display. Next to the main display are 2 indicators to signify when the
display is showing a weight value (g) or a result of a drying test (%).
The keypad has 6 keys to control the operation of the balance. During
the weighing mode all keys are available. During a drying test only
the [TARE] key is available to abort the test.

3. KEY DESCRIPTION

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4. UNPACKING AND SETTING UP THE MOISTURE ANALYZER

Unpack the moisture analyser carefully.

The carton contains

:

1. Drying chamber casing

2. Weighing pan support

3. Weighing pans

4. Weighing pans, pack of 10

Place the moisture analyser on a stable weighing table.
Do not install the balance near warm and cold sources, such as windows,
radiators or air conditioners. Protect the balance from vibrations, dust and
drafts.

Turn the adjustable feet until the balance is level (check the spirit level on
the rear of balance).
Install the weighing chamber liner on the 4 supports.
Install the pan support by placing the pan stem into the receptacle in the
weighing chamber. Be careful not to press on the pan as this may damage
the balance.

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5. TURN MOISTURE BALANCE ON

After turn power on moisture balance does two actives automatically.
First of them is heating drying chamber – halogen heater shed light.
Time of heating drying chamber is 3 min. Second activation is 3 min
stabilization entire moisture balance.

Pressing TARE key leaves procedure of every cycle and moves to

weighing.

Heating and stabilization of moisture balance should be done after first
plug to supply net.

If moisture balance is used as precise balance it should be calibrated
(calibration described in further part of instruction). If moisture balance
is used as moisture balance sett-up parameters of drying (calibration
isn’t neccesary).

6. MAINTENANCE

Moisture balance has extented user menu with:

• 7 different ways of work, for every of them moisture is defined
according to format

• cells of memory where factors for correction temperature of drying
for 9 different materials are collected

Before drying all parameters should be defined. These parameters

are:

- choose numer of dried substance - SubSt -

- factor for correction temperature of drying - SubcoF –

- kind of work - rnodE -

- temperature of drying - tErnP -

- time of testing sample - Strob –

- form for displaying per cent results (how many places after dot) –

dPP –

-

time of drying - intEr -

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7. PREPARATION SAMPLES TO DRYING

Loose materials

They are dried in natural form or after comminution. Disintegration
sample makes dispersions between following measurements smaller. Mass
of ample cannot be too big. Surface of scale should be covered by thin
layer of sample.

Liquid

Semi – fluid substances are dried in constance they usually are.
Match amounts of grease in some substances make procedure of defining
moisture more difficult. In these cases use additional elements that enlarge
active surface of sample in which moisture is tested. To tested substamces
quartz sand or blotting-paper should be added. Before drying subtance
additional ingredients should be dried to lessen their moisture to 0.

Solids

Procedure of detecting moisture is slow or fast dependly on structure
of substance (dense, loose). Size of surface of solid has influence on
speed of drying and precision of measurement. Surface of substance
should the bigest as its possible. Solids emit moisture by outsider surface.
Thickness of sample is also very important

.

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8. CHOICE PARAMETERS OF DRYING

Temperature of drying

Value depends on kind of material. Too low temperature makes
partial evaporation (sample isn’t dried completely). Too high temperature
makes deflagration substance (sample is overheated) or possibility to
appearance chemical reactions. Temperature of drying is given by factory
and trade rules. If there is no rules given temperature can be chosen
experimental.

Time of testing sample

This is range of time [given in seconds] between following
measurements of sample mass. On the basic of this criterion moisture
balance treats sample as dried. Too short time of testing sample makes
fihish of measurement too soon. Too long time of testing sample makes
oscillate around final result. Measurement is finished if 3 following results of
detecting moisture are the same. If time of testing sample is settled on 2s
drying is finished if result doesn’t change in 6 s time. If time of testing is
settled on 20s result has to be the same by 1 minute time to finish drying.

1 – correctly selected drying parameters
2 – too big sample mass or too low temperature of drying or too

short time of drying

3 – disturbances in the drying process or to long time of

sampling

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