12E5119 Instruction Manual QuickTOC
®
ultra
IECEx 79
LAR | PROCESS ANALYSERS AG
6 Reagents and Calibration Standards
6 Reagents and Calibration Standards
Deionised water, rinsing water, calibration standards (and possibly acid solutions) are required for the
analyser measurement mode. This section shows how you can prepare the calibration standards and
solutions yourself.
6.1 Reagents
6.1.1 Deionised Water for Calibration Standards
Deionised Water is required to make the calibration standards. It should contain a low fraction of carbon
and nitrogen compounds. The purity of the deionised water is dependent on the working range set.
6.1.2 Rinsing Water
Deionised water is required to rinse the injection needle. The amount is dependent on the measurement
frequency set and the number of sample streams. The conductivity of the deionised water must be bet-
ween 1μS/cm and 10μS/cm, and the maximum permitted concentration for TC may not exceed 1 mg/l.
Proceed as follows:
1. Fill a 5 l graduated flask with 5 litres of deionised water.
2. Add 1 ml of 85% phosphoric acid (H
3
PO
4
).
3. Degas the rinsing water using underpressure or put it into an ultrasonic bath for five minutes.
4. Keep the rinsing water underneath the analyser (e.g. in the Reagent Cabinet or Ambient Air
Preparation Unit).
Warning
Harmful Chemicals
Observe the safety rules for the preparation of chemical solutions.
Follow the instructions for setting up the solutions.
Notice
You can prepare the necessary stock solutions yourself or order them from
LAR.
When ordering solutions, please bear in mind the supplier specifications for
shelf life and storage conditions.
Table 9: Purity Grades of the Deionised Water for TOC Measurement
Working Range
[mg/l C]
Maximum Permitted C-Concentration
[mg/l C]
< 2 0.1
< 10 0.3
10 – 100 0.5
> 100 1.0
!
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