Table of Contents
Advertisement
DVOR 432
Maintenance
5.4.1.2
Preliminary Operations
5.4.1.2.1
Accumulator Acid and Specially Purified Water
Diluted sulphuric acid and specially purified water are used for filling and topping up lead batteries.
The regulations specified in VDE 0510 (regulations for accumulators and battery installations), ac
cording to which no components which may be harmful to the plates may be used, must be con
formed with. Particularly harmful substances are chlorine, which is present both in the water and in
the acid, and iron which is sometimes contained in the acid. These impurities can however easily be
evidenced. Only specially purified water, i.e. water which has been distilled or fully desalted, may be
used. It must moreover be clear, colorless and odorless
Boiled water, rainwater, well water, river water, tap water or condensation from machines,
heating systems etc. are unsuitable.
The sulphuric acid and the water should be kept in glass or plastic containers, which must be sealed
and covered carefully. Dust and vapors which penetrate may contaminate originally pure liquids.
5.4.1.2.2
Mixing Sulphuric Acid
If the accumulator acid does not have a specified density, specially purified water should be mixed
with a high-density acid (mixed acid) in order to obtain the values shown in the chart (Fig. 5-1).
When mixing high-density acid with water the acid must be added to the water in a thin
stream whilst stirring with a clean wooden rod. If the water is added to the acid, the latter
will splash dangerously.
values at 20 °C (68 °F)
* mixed acid: available high-density acid
Fig. 5-1
Accumulator acid chart
5-8
CAUTION
WARNING
special purified water
Litres
1,200
0
100
10
90
20
80
30
70
40
60
50
50
60
40
70
30
80
20
90
10
100
0
1,180
1,220
nominal density of accumulator acid (kg/l)
Operation and Maintenance
density of mixed acid (kg/l) *
1,250
1,300
1,350
1,400
1,500
1,600
1,710
1,800
A
1,260
1,300
1,340
Ed. 01.04
Advertisement
Table of Contents
