![]() First, you draw a sample of battery acid from the battery using the hydrometer. It takes three basic steps to measure the specific gravity of the battery with a battery hydrometer. How do you measure specific gravity in a battery? You can also determine the overall health of each cell by analyzing the specific gravity measurements taken over a period of time. In lead-acid batteries, SG reading can tell you the amount of charge in each battery cell. The SG reading is the measure of the number of times a fluid is denser than water. You can perform a hydrometer test to determine how healthy the cells of a battery are before and after performing regular maintenance.Ī hydrometer uses the principle of buoyancy to measure the specific gravity (SG) of a fluid. It is a very handy measurement tool for flooded lead-acid batteries mostly found in cars, golf-carts, off-grid installations, and camping RVs. What is the sg of water? What is a battery hydrometer?Ī battery hydrometer is a tool for measuring the specific gravity of the electrolyte in a flooded deep-cycle battery to determine the state of charge. Please take some time to look our other available component tools on our product pages.9.14. Both of these battery testers test not only voltage and internal resistance, but are optimized to measure the actual performance of the battery, letting you know if you are getting all the power your system needs. Our similarly designed Cell Checker (Cell03) is designed for SLA batteries while being just as simple to use. Our Power Checker (PC01) is ideal for wireless detectors and is easy to use, with no complicated switches or settings to adjust. ![]() You need to know you can trust the tools you use.Īt SDi Fire, our expertise and knowledge of fire alarm systems has helped us to develop highly accurate and high efficiency battery testers. Working with electrical components is a delicate task, often carrying no small amount of risk. Cheap, poorly designed or faulty battery testers can result in a lengthy process, and more importantly, inaccurate results. However, carrying out these tests can be a time-consuming, daunting and complicated procedure if you are forced to do it without the right equipment. Testing within these guidelines, as required by the NFPA, will ensure that a fire alarm and emergency system is always fully functional and always ready. These tests must be carried out initially, before the battery is installed, and then annually until they are replaced. Testing discharge again requires the battery to be fully charged, but then disconnected from a charger, then load-tested for 30 minutes with the voltage output not falling below the level that would be required to run your system.įinally, testing load voltage involves a charged battery, disconnected from a charge, and run at terminal voltage while it is required to supply the maximum load of the system it is used to power. This is carried out while the battery is connected to a charger. In testing the charge of a battery, the battery must be fully charged and then tested with a voltmeter. Batteries need to be tested for charge, discharge and load voltage. ![]() Using a well-designed, accurate and reliable battery tester makes all the difference in knowing exactly how well the battery and your fire alarm system is working. The National Fire Alarm code recommends testing the battery’s load voltage, discharge and seal on semi-annual and annual basis. At SDi Fire, we work closely with NFPA regulations to design our battery testers and other fire safety equipment. ![]() Using battery testers is an essential requirement of gauging how well your system’s battery is working, and how much power it has left until it needs to be replaced. Regular inspections and maintenance should be conducted as standard practice, and inspecting and testing the battery is an important step in this process. Any complex electric system will need regular maintenance and fire alarm systems are no different. A neglected battery running low on charge, or suffering some other fault could cut out at any time, leaving your emergency system without power when it is needed most. Like any battery-powered equipment, fire alarm and emergency systems are vulnerable to faults in their power supply.
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