Page 44 - CITS - Electrician - Trade Practical
P. 44

v

                                                                                   ELECTRICIAN - CITS



           EXERCISE 15 : To measure the specific gravity of Electrolyte



           Objectives
           At the end of this exercise you shall be able to
           •  check the level of electrolyte and top up distilled water in battery.
           •  check the specific gravity of electrolyte with hydrometer.
           •  check the state of charge of battery by the value of specific gravity.

           Requirements

            Tools/Equipments/Instruments                       •  Lead acid battery (12 V, 65 AH)   -1 No.
           •  Combination plier (165mm, insulated)  - 1 No.    Materials/Components
           •  Neon tester (75mm, insulated)     -1 No.         •  Distilled water                - 2 litre.
           •  Screw driver, insulated (150mm)    -1 No.        •  Plastic funnel                 -1 No.
           •  Hydrometer                        -1 No.         •  Cotton waste                   - As reqd.
           •  Digital Multi meter (3 digit)     - 1 No.
                                1/2

            Procedure


           TASK 1:  Check the battery and hydrometer
           1  Take the hydrometer and observe its scale.
           2  Take the lead acid battery and clean it with wet cloth.
           3  Check the battery voltage and AH rating of battery.


           TASK 2: Check the specific gravity of electrolyte

           1  Uncap the vent holes of battery and check the level of Electrolyte.
           2  Top up with distilled water to maintain the level of Electrolyte.
           3  Insert the tube of hydrometer into vent hole of battery.
           4  Squeeze the rubber ball of hydrometer and draw the electrolyte in hydrometer.
           5   Now read the scale of hydrometer and check specific gravity of electrolyte.

           6  Repeat the same for 2 - 3 samples and note the hydrometer readings.
           Safety precautions
           •   Handle the hydrometer carefully to avoid damage.
           •  Wear necessary PPE’s while handling the battery.
           •  Do not leak OR spill the electrolyte while checking specific gravity.

           •  Read the hydrometer scale correctly.


















                                                           27
   39   40   41   42   43   44   45   46   47   48   49