12E5119 Instruction Manual QuickTOC
®
ultra
IECEx 81
6 Reagents and Calibration Standards
6.1 Reagents
LAR | PROCESS ANALYSERS AG
6.1.5 Cleaning Solution for Glass Components
Conventional cleaning agents can be used to clean sample and calibration vessels. Very thorough
cleaning with a bottle brush is required for analysers working in low TOC working ranges (< 100 mg/l C).
We recommend the following cleaning method for high levels of contamination which cannot be removed
using a bottle brush.
Proceed as follows:
1. Fill a 1 l graduated flask with 0.8 litres of water.
2. Add 10 ml of concentrated sulphuric acid (H
2
SO
4
) and 1 g of potassium manganate (KM
4
O
4
).
3. Fill the graduated flask up to 1 l with water.
4. Allow the glass vessels to stand in this solution overnight.
5. Fill a 1 l graduated flask with 0.8 litres of water.
6. Add 10 ml of concentrated sulphuric acid (H
2
SO
4
) and 10 to 20 ml of hydrogen peroxide (H
2
O
2
).
7. Fill the graduated flask up to 1 l with water.
8. Allow the glass vessels to stand in this solution for about 24 hours.
9. Thoroughly rinse the glass vessels at least three times with clean distilled water.
If ambient air cleaned with LAR equipment is used as the carrier gas, the following chemicals are
required:Highly volatile organic components (eg solvents) in the ambient air may have a negative
impact on the accuracy of the measurement, depending on the installation site. All volatile carbons
(VOCs) must be removed from the ambient air. Activated carbon is used for this task. The CO2 in the
ambient air is removed by the soda lime pellets. When the chemicals are saturated with volatile carbon
(VOC), the analyser's base signal rises. The signal value depends on the detector connected to the
analyser.
If the activated carbon has changed color, the activated carbon must be replaced.If the soda lime pellets
have changed color, the soda lime pellets must be replaced.
To Next Page
Loading...