Metrohm 827 pH lab Manual de usuario descargar pdf (Pagina 40)

6.1 pH measurement (pH mode)

32 826/827 pH meter, Instructions for Use

The other stored buffer tables are described in Section 9.3. During the

calibration the pH meter shows the type and temperature-specific pH

value of the recognized buffer. For temperatures within the 5 °C steps

the pH value is linearly interpolated.

buff.type: special

If you would like to use different buffers from those described,

then you require the exact pH value of each buffer at the tempera-

ture used for calibration. These pH values can be entered here.

During the calibration they can again be adapted before each

measurement.

A general rule is that you can only calibrate in defined temperature

ranges, as otherwise the following error message appears:

buffer not defined

6.1.3 Limits

param

├ cal.limits

: ├ lo.lim.slope

├ up lim.slope

├ lo.lim.pH(0)

└

up lim.pH(0)

The most important calibration data such as slope and pH(0) must be

within the limits defined here in order to be adopted automatically.

lo.lim.slope 1.0...95.0...999.9 %

up lim.slope 1.0...103.0...999.9 %

lo.lim.pH(0) 0.00...6.40...99.99

up lim.pH(0) 0.00...8.00...99.99

If one of the values of the calibration data lies outside these limits then

at the end of the calibration the following message is displayed:

cal. out of limits

You can accept these calibration data nevertheless with <OK> or you

can reject them with <QUIT>.

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Metrohm 827 pH lab Manual de usuario Pagina 40