Metrohm 736 GP Titrino User Manual

736 GP Titrino, Short instructions for use

CH-9101 Herisau/Switzerland
Phone ++41 71 53 85 85
Fax ++41 71 53 89 01

736 GP Titrino

Short instructions for use

8.736.1023

95.12 Ti/pr

736 GP Titrino, Short instructions for use

Table of contents

Page

1. Getting started ........................................................................1

1.1 Principle of data input .........................................................1

1.2 Development of a method................................................... 3

1.3 Storing methods .................................................................7

1.4 Working with several dosing units.....................................10

2. Titration, dosing and measuring modes .............................12

2.1 Survey of the titration modes ............................................ 12

2.2 Mode DET and MET, parameters ..................................... 14

2.3 Mode SET, parameters.....................................................15

2.4 Mode KFT, parameters.....................................................16

2.5 Mode STAT, parameters ..................................................17

2.6 Mode DOS, parameters....................................................19

2.7 Mode DOC, parameters....................................................20

2.8 Mode MEAS and CAL, parameters................................... 21

2.9 Mode TIP, parameters......................................................22

2.10 Calculations .................................................................... 23

3. Other functions .....................................................................25

3.1 Method memory................................................................25

3.2 Sample data, keys <smpl data> and <silo> ......................27

3.3 Configuration, key <configuration> ...................................28

Index ..........................................................................................29

1.1 Principle of data input

736 GP Titrino: Getting started

1

1 Getting started

This is a step by step introduction into the operation of the
Titrino.
You learn how to go round with the Titrino and you get an
idea of the possibilities that the Titrino offers you.

1.1 Principle of data input

Entering data, setting the dialog languageEntering data, setting the dialog language

<configuration>

<enter>

<select>

<enter>

2 x <QUIT>

Press <STOP> if the Titrino is busy. It is now in the inactive
standby state. Then press the <configuration> key. The dis­play shows:

This is the title of the inquiry group "peripheral units". This
group contains various inquiries about peripheral units.

Press the <configuration> key once more. You see the title of
a new group of inquiries:

This is the title of the "auxiliaries" group. This group contains
the inquiry for the dialog language. Note the ">" sign. All titles
are prefixed by this sign.

Pressing the <enter> key takes you to the different inquiries of
the group "auxiliaries". The display shows

This is the selection of the dialog language. You select the
various dialog languages with the <select> key. Note the ‘’:’’
sign after the word "dialog". It appears if the values can be
selected with key <select>. Press <select> repeatedly until
"english" appears in the display.
Accept the new "value" with <enter> and the next inquiry ap­pears.

Other inquiries of the "auxiliaries" group are not of interest at
the moment. Exit the inquiries with <QUIT>. Press <QUIT>
once again to exit the inquiries of the <configuration> key.

date 1997-12-16

dialog: deutsch

dialog: english

>peripheral units

>auxiliaries

1.1 Principle of data input

736 GP Titrino: Getting started

2

Summary of the most important signsSummary of the most important signs

Signs in the Titrino dialog:
> Title of inquiry groups, e.g. ">auxiliaries"
: Values can be chosen by the key <select>, e.g.

"dialog:"

Signs that are used in the instructions for use
<> sign for "key", e.g. <select>

1.2 Development of a method

736 GP Titrino: Getting started

3

1.2 Development of a method

You learn how to elaborate a method .
First you select a titration mode. A general survey of the dif­ferent titration modes is given on page 12.

Selecting the modeSelecting the mode

<mode>

<enter>

<select>

<enter>

Press <mode> repeatedly until "DET" appears in the display.
DET stands for Dynamic Equivalence point Titration. In this
titration, the size of the volume increments vary as a function
of the slope of the titration curve. After each increment, a pre­set measured value drift (or time) is awaited until the next
increment is added (so called "equilibrium titration"). After the
titration, the equivalence points are evaluated automatically.
Confirm "DET" with <enter>.

Now select the measured quantity: Press <select> until "pH"
appears in the display.

Confirm the measured quantity "pH" with <enter>.

You are now ready to titrate.

For the titration, you need an Exchange Unit with NaOH,
c=0.1 mol/L. If you have not yet prepared an Exchange Unit,
see page 188 ff of the Instructions for Use.
Plug a combined pH glass electrode into measuring input
("Ind I").
Pipette 2 mL HCI, c =0.1 mol/L into the titration vessel, dilute
it with ca. 20 mL. dist. water, adjust the stirrer and press
<START>.

During the titration, the first line of the display shows the cur­rent measured value and the volume already dispensed:

As soon as the instrument has found an equivalence point,
this is shown on the second line:

Let the titration continue for a short while, e.g. until ca.
pH=11.50. Now stop it with <STOP>.

The second line shows the equivalence point found, e.g.:

If more than one equivalence point has been found, the sec­ond equivalence point can be viewed with <enter>

DET pH D0a ********

DET: pH

DET: U

mode DET

pH 2.78 0.351 ml

EP1

EP1 2.083 ml pH 7.64

1.2 Development of a method

736 GP Titrino: Getting started

4

Calculation of the result, entry of a formulaCalculation of the result, entry of a formula

You may calculate results with the equivalence point.

<def>

<enter>

<1>

<enter>

<enter>

<enter>

<enter>

<select>

<enter>

2 x <QUIT>

Press <def> . The display shows

Press <enter> to move on to the formula entry. The display
now shows "RS? ".

Press "1", i.e. the first formula.

You can now enter a formula. Note here the top inscription on
the keys of the keypad and the numbers.
You can use mathematical operations, parentheses as well as
the following symbols:
EP# EP’s with 1-digit number, e.g. EP1.
RS# Previously calculated results, e.g. RS1 in the second

formula.

C## Calculation values, e.g. C01. C00 is reserved for the

sample size. The meaning of the different calculation
values is given on page 23.

Calculate the content of your hydrochloric acid in g/L:
RS1=EP1*C01*C02/C00
EP*conc(titrant)*molar mass/sample size

Confirm the formula with <enter>.

You may enter a text for the result output, see page 7.

Enter the desired number of decimal places for the result.

Select the unit g/I with <select> or enter a text as unit.

Quit the formula entry by pressing <QUIT> twice.

Entry of the calculation constantsEntry of the calculation constants

<C-fmla>

0.1 <enter>

36.47 <enter>

Press <C-fmla>. The constants which have been used in the
formula are requested:

C01: Concentration of your titrant = 0.1 mol/L.
C02: Molar mass of HCI = 36.47 g/mol

>formula

RS1 unit: %

RS1 decimal places 2

RS1 text RS1

RS1=EP1*C01*C02/C00

RS?

C01

C02

1.2 Development of a method

736 GP Titrino: Getting started

5

Entry of the sample sizeEntry of the sample size

4 x <smpl data>

2 <enter>

<select>

<enter>

Press <smpl data> repeatedly until "smpl size" appears
in the display.

Enter 2 (= 2 ml).

Use <select> to select the unit "ml" and confirm the
new value with <enter>.

The result is now calculated and can be displayed in place
of the equivalence point. If your method already includes a
formula at the end of the titration, the calculated result is
displayed directly after the titration. As we have entered the
formula later, we now have to select the result display:

Display of the resultDisplay of the result

<select>

<enter>

Press <select> repeatedly until ">display results" appears
in the display.

Press <enter> to move on to the result display.

Selection of the automatic report outputSelection of the automatic report output

If you have a printer connected, you can have the curve
and a result report printed out automatically at the end
of the titration.

4 x <def>

<enter>

<select>

<enter>
<QUIT>

Press <def>repeatedly until the display shows ">report".

Press <enter> to move to the definition of reports.

With <select> you select the individual report blocks
Use a ";" as delimiter between the report blocks. If you
wish to print out a curve and a full result report, enter
"curve;full".

Confirm the entry with <enter> and quit the inquiries
with <QUIT>

>display results

>report

smpl unit: ml

smpl size 1.0 g

RS1 3.80 g/l

report:curve;full

report:

1.2 Development of a method

736 GP Titrino: Getting started

6

Press <print> <reports> <enter> .
Your printout will look as follows:

Identification of the report type
(cu = curve)

Start volume and method identification
Scaling of curve axis

- Identification of the report type

- Initial pH and method with identification

- Volume and pH value of EP1

- Calculated result with result text

Entry of a stop criterionEntry of a stop criterion

You don't want to stop your titration manually each time. Let
us enter an automatic stop criterion.

2 x <parameters>

<enter>

<enter>

<enter>

11.5 <enter>

2 x <QUIT>

Press <parameters> twice to display the title ">stop condi­tions".

The absolute stop volume. It can be used as a safety volume
to prevent overflow of the titration vessel.

Enter a value for the stop volume that appears suitable for
your titration vessel.

Set the pH value, e.g. 11.5 as stop criterion.
If several stop criteria have been set, the one that is reached
first, applies.

Confirm the input with <enter> and quit the inquiry with
<QUIT>.

Try another titration with this method.

'cu
736 GP Titrino 05325 736.0010
date 1997-12-16 time 09:07 1
start V 0.000 ml DET pH ********

1.0 ml/div dpH=2.0/div

−−−−−−−−−−−−−−−−

'fr
736 GP Titrino 05325 736.0010
date 1997-12-16 time 09:07 1
pH(init) 2.88 DET pH ********
smpl size 2 ml
EP1 2.083 ml 7.64
RS1 3.80 g/l
manual stop

−−−−−−−−−−−−−−−−

>stop conditions

stop pH OFF

stop V 99.99 ml

stop V: abs.

1.3 Storing methods

736 GP Titrino: Getting started

7

1.3 Storing methods

You learn how to operate the method memories.
The Titrino offers 2 types of method memories:

• Internal method memory, key <user meth>

• External method memory on the card, key <card>

Storing a method in the internal method memoryStoring a method in the internal method memory

2 x <user meth>

<enter>

< << >

< << > + < >> >

<enter>

:

<QUIT>

<enter>

Press key <user meth> repeatedly until ">store method" ap­pears in the display.

Enter an identification for your method, e.g. HCl:

Press key < << >. The display shows a row of letters. The first
position of this row is blinking. This is the input position.

You can move this row of letters pressing the < << > and
< >> >. Press < >> > until an "H" appears in the blinking posi-
tion and confirm it with <enter>.

The next position is now blinking. Enter the next letter here,
confirm it with <enter> etc.

If the identifier is complete, quit the text input with <QUIT>.

Confirm the value with <enter>. The method is stored in the
memory.

The method runs now under the identifier "HCl".

A list of contents of the method memory can be printed with
the key sequence <print><user meth><enter>.

>store method

method name: HCl

DET pH D0a HCl

method name: HClmnopq

method name: HIJKLMNO

method name: ABCDEFGH

method name: ********

'um
736 GP Titrino 02103 736.0010
date 1997-09-13 time 07:49
user methods bytes
DET pH Titer_pH D0 190
DET U Blank D0 178
DET U Chloride D0 234
MET U Diazo D0 208
MET Ipol Br-Index D0 226
DET U Ca-Mg D0 278
DET U EDTA-NTA D0 216
DET U Metals D0 190
DET U Perox.No D0 172
DET pH HCl D0 108
remaining bytes 7330

------------

mode and
measured
quantity

method
name

dosing unit, that
is being used

1.3 Storing methods

736 GP Titrino: Getting started

8

Recall a method from the internal method memoryRecall a method from the internal method memory

Stored methods can always be recalled into the working
memory.

<user meth>

<enter>

<select>

<enter>

Press the key <user meth>. In the display appears ">recall
method".

You can choose a method with <select> or enter its name
directly.

Recall the method with <enter>.

The method is now ready to work.

Method memory on the cardMethod memory on the card

The card offers additional memory space for methods. It may
be used e.g.

• as a backup-medium for the internal method memory

• as an extended method memory, where the methods can

be organized in various directories

• if every user wants to store his methods on his own card

• for exchanging methods between various laboratories,

apparatus, and/or users
The card has a battery, which should be exchanged periodi­cally, see page 85 of the Instructions for Use.

As an example, perform a backup from the internal method
memory to the card. If the card is not formatted, see page 86
of the Instructions for Use.

7 x <card>

<enter>

name + <enter>

Press the key <card> repeatedly until ">backup" appears in
the display.

Confirm this function with the key <enter> and give a name
for the backup directory.
If you wish to overwrite an existing directory, choose a name
with <select>.

The backup will be effected.

>recall method

>backup

DET pH D0a HCl

method name: HCl

directory: