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Model: HL-T96A HL-T72A AC Ammeter
Model: HL-T96V HL-T72V AC Voltmeter
Accuracy class: 1.5.
For through current: 0.1A 0.5A 1A 1.5A 3A 5A 10A 15A 20A 25A 30A 40A 50A 60A 75A 100A. For through current higher than 40A, the accuracy class is 2.5.
For transformation ratio: The meters should be used with a current transformer of which primary current is 10A 15A 20A 25A 30A 40A 50A 60A 75A 100A…10KA and external secondary current 1A or 5A. As long as overload rate and the incoming current keep the same, dial scales of all medels in this series can be exchanged yet remain the accuracy.
Overload rate of ammeters: ①non-overload ②1.2 times ③2 times ④5 times
For through voltage: 30V 50V 75V 100V 120V 150V 200V 250V 300V 400V 450V 500V 600V.
For transformation ratio: The meters should be used with a voltage transformer of which primary voltage is 400V 450V 500V 600V 1000V 1500V 2000V 3000V 5000V…450KV and external secondary voltage 100V.
Overload rate of voltmeters: ①non-overload ②1.2 times
Product performance: All the meters are equipped with pure white silk-screen printing dial scale. The movement is made of high-performance flame retardant PC plastics, of which the flame retardant class is V-0, resistant voltage up to 4300V and resistant heat higher than 120℃. The meter is easy to install with imported high-strengh stainless steel by stamping so that it is of high immobility. The protective cover adopts the whole area design, and the clamping structure which is easy to assemble and dissemble, make the meter up to the rules of international standard IEC61010-1.
Principles of measurement and the fearures: Each electromagnetic meter consists of a magnet coil with a static sheet iron inside and a moving sheet iron with a tractive balance spring. When current flows through the magnet coil, magnetic field appears. Under such circumstance, the static and the moving sheet irons are magnetized simultaneously and remain the same polarity. According to the theory that the same polarities repel each other, repulsive force between the two irons makes the pointer deflect. When the torque and the restoring torque keep a balance, the pointer on the moving iron will point to a scale mark, which is the measured value.
The electromagnetic meters can be used for AC circuits under ordinary circumstance as well as for DC circuits instructed with TRMS. The advantages are high accuracy, simple structure, and high overload capacity. And they can as well be used in 50 Hz/60Hz circuits. Special frequency should be marked out in ordering.