Page 44 - CITS - Electrician - Trade Practical

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