29.13.1 Calculations (CALC). Metrohm 900 Touch Control

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Input range

Default value

0 to 999999 s

999999 s

29.13 Calculations

The following calculation commands are available:

CALC Defining calculations of a determination.

CALC LIVE Defining the calculation whose result will be displayed in the live display (so-called live result) during a titration or measurement.

29.13.1 Calculations (CALC)

Calculations are defined with the command CALC . A method may contain a maximum of nine calculation commands. A maximum of nine calculations can be defined per command. A series of variables (raw data from the determination, previously calculated results, etc.) is available for the calculations.

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The command contains the following options, among others:

Save result as titer

Save result as common variable

Save result in result table

Define result limits

[New]

[Delete]

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The result name is specified in the list for each calculation.

Define a new calculation or load an existing template, see following chapter.

Delete the selected calculation from the list.

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[Edit]

29 Parameters

Edit the data of the selected calculation

(see chapter 29.13.1.2, page

421) .

29.13.1.1 Loading a result template

The most common calculations are already available, the so-called result templates, in order to facilitate the definition of a new calculation. You also have the option, however, of defining templates of your own (see dialog System / Templates ).

Proceed as follows to load an existing template:

1 Select a result template

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In the Sequence / Edit command dialog, tap on the [New] button.

The list of Metrohm result templates is displayed:

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Select the desired Metrohm result template and tap on [Load template] .

or

Tap on [Custom templates] and select a template you generated yourself.

If a statistic variable SMN# (# = 1…9) is defined in the template which is already used in another calculation, then the following message will be displayed:

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2 Confirm the message

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Tap on [OK] .

The Note dialog is displayed. This note is defined in the dialog Edit result template / Note for wizard .

3 Enter the numerical values of the wildcards

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Tap on [Next] .

The list of wildcards is displayed:

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Enter the numerical values of the wildcards.

Tap on [Next] .

The editing dialog of the new calculation is displayed:

29 Parameters

The calculation can now be edited further, e.g. define result limits, see following chapter.

29.13.1.2

Result name

Editing a calculation

Calc. formula R1...R9

Shows the calculation formula. A special editor is opened for the definition

(see chapter 29.13.3, page 427)

. The designation R1...R9

corresponds to the result variable. Under [Result variable] this can later be modified.

Entry

Default value max. 100 characters empty

Decimal places

The result name is the text which will be shown in the result display and in the report. The default name corresponds to the result variable.

Entry

Default value max. 24 characters

R1…R9

Number of decimal places used to display the result.

Input range

Default value

0 to 5

2

Result unit

The result unit is displayed and saved together with the result.

Entry max. 10 characters

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29.13 Calculations

Selection

Default value

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% | mol/L | mmol/L | g/L | mg/L | mg/mL | mg/100 g | ppm | g | mg | µg | mL | µL | mg/ piece | °C | µg/min | mL/min | µL/min

%

[Note]

Entering a note on the calculation.

[Result variable]

Modifying the result variable.

[Result limits]

Defining the limits for the monitoring of the result.

[Result options]

Defining additional settings for the calculation.

Dialog "Edit calculation / Note"

In this dialog you can enter a short text, e.g. to describe the variables used.

Dialog "Edit calculation / Result variable"

When a new calculation is created, the result variable will be automatically issued. In this dialog, however, it can be modified at any time.

Result variable

To each calculation belongs an unambiguous result variable. With this result variable you can use this result in additional calculations.

Selection R1 | R2 | R3 | R4 | R5 | R6 | R7 | R8 | R9

The selection contains only those result variables which are not issued in this calculation command yet.

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Dialog "Edit calculation / Result limits"

For each result, limit values can be defined. These result limits are monitored when the calculation is carried out. If monitoring is activated, the results are shown as follows in the result display:

Green, if the result falls within the limit values

Red, if the result lies outside the limit values

Monitoring result limits on | off (Default value: off )

Enabling and disabling the monitoring function.

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Lower limit

When the monitored quantity falls below this value, the action defined in the following is triggered.

Input range

Default value

0 to 9999999999

0

Upper limit

When this value is exceeded, the action defined in the following is triggered.

Input range

Default value

0 to 9999999999

9999999999

Action

Selection of the action, which is carried out when the result limits are exceeded.

Selection

Default value

Display message | Document message | Cancel determination

Display message

Display message

A message is displayed. You can select whether you want to continue with the determination or cancel the run.

Document message

In the determination data it will be documented, that the result limits have been exceeded.

Cancel determination

The determination is stopped.

Dialog "Edit calculation / Result options"

In the dialog Edit calculation / Result options , settings for how to process the calculated result are defined.

Variable for mean value

If the statistic calculations have been activated (see method options), the mean value of the single results will be saved as variable SMN1 to SMN9.

As default value, always the first free variable is being displayed.

Selection SMN1 … SMN9 | off off

For the result not statistic calculations are carried out.

Save as titer

The result can be saved as titer for the selected titrant.

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NOTICE

The titer is assigned to the titrant defined in the last titration command before the calculation. Please note that the CALC command containing the titer assignment is inserted after the titration command with which the titer is determined.

Selection

Default value

Single value | Mean value | off off

Single value

The result of the current determination is saved as titer.

Mean value

If statistic calculations are carried out for the result, the current mean value of the determination series is saved.

off

The result is not saved as titer.

Save as common variable on | off (Default value: off )

The calculated result can be saved as a method-independent variable, a so-called common variable. The result is then also available in other methods for calculations. In all cases, only the single value will be saved, even if the statistics function is enabled.

Variable

Selection of the common variable to which the result is being assigned.

Selection CV01 … CV25

Display result on | off (Default value: on )

If you deactivate this parameter, the result is neither displayed in the result dialog nor printed in the result report. This can be advisable for intermediate results.

Save result in result table on | off (Default value: off )

The calculated result can be saved in the result table. This may be advisable if e.g. the results of all determinations carried out on a particular day are to be displayed clearly. A maximum of nine results from a determination can be saved in the result table.

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