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8. Is there any other simple method which indicates that the dried negative plates are of acceptable quality? |
| A simple indication is available if it is observed that the assembled battery |
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temperature does not increase more than 8 degree Celsius to 10 degree Celsius. |
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sp.gr. does not fall by over 0.02 to 0.04 points. |
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| over a one hour period after filling of acid in the battery. |
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| 9. How important is the washing of negative plates prior to dry charge process? |
It is important to wash the negative plates free of acid and check whether the wash water pH is between 5.5 to 6.0 prior to loading the plates on to the dry charging chamber.
Please note that it is equally important to load the washed plates into the machine within an hour of such a complete wash - free of acid.
In case the plates have to be stored for a long period in water after washing, it is necessary to retain some acidity in the water. Hence it is recommended to do the washing in two stages. In stage one wash plates such that the wash water pH is around 4.5 to 5.5. Keep negative plates in a tank of such an acidic water. As and when the negative plates are to be dried and approx. an hour or so prior to loading into the machine the second stage of washing can be carried out i.e. plates can be washed to a pH of 5.5 to 6.0. |
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If the plates are not washed completely free of acid prior to loading on to the machines the seals of the vacuum pump shall get damaged leading to machine breakdown and production downtime. |
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