82 Instruction Manual QuickTOC
®
ultra
IECEx 12E5119
6 Reagents and Calibration Standards
6.2 Calibration Standards LAR | PROCESS ANALYSERS AG
6.2 Calibration Standards
The concentration of the standard is dependent on the chosen working range . It should be at least 50%
and at most 100% of the working range end value. The standard is prepared in accordance with DIN EN
1484:1997.
The calibration standards in the calibration vessel should replaced as follows (potassium hydro-
gen phthalate):
• Weekly for a concentration > 100 mg/l C.
• Daily for a concentration < 100 mg/l C.
6.2.1 Calibration Standards - TOC-Difference Method
This section explains how you can prepare the calibration standards for the TOC-Difference Method.
First, a stock solution needs to be prepared which can then be diluted to obtain the required calibration
standard concentration.
Example:
If a working range of 1,000 mg/l C is set, the calibration standard must be between 500 mg/l and 1,000
mg/l C. A concentration of 750 mg/l C or 800 mg/l C would be ideal in this case.
Warning
Warning of malfunctions
Make sure that you provide a logical concentration for your working range.
Otherwise, the analyser won‘t work correctly after calibration.
Notice
Appropriate certified calibration standards can be purchased directly from the
LAR to minimize the effort of preparation.
For more information please contact the Sales Department of LAR
(Chapter 15 on page 283).
Notice
To minimise mistakes, LAR always recommends using the stock solution as
the initial solution for dilutions.
The stock solution and its diluitions can be used as a calibration standard.
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