Company brief
Ningbo Beilun Rijin Instrument Factory founded in 1997, it is a professional manufactory who produce domestic standard and non-standard meter, and special used meter. Factory located in Ningbo Beilun, where is only 5km far from Beilun Port and 1km from the end of Hangyong highway. The main products are widely used in machinery industry, high and low voltage switchboard, Electronic communication equipment, measuring instruments and automation and control equipment. Meanwhile 30uA round meter and EL lighting meter have exported to USA and Germany, moreover they are unanimously approved by the customers. All the products meet GB7676-98 national standard and internal CE certification request.
Our business purpose is. Quality is first, Customer is first, integrity is first. Customers request is our developing target, we will continuously develop research, design and enrich these meters to improve the quality and function. We sincerely welcome internal and external customers to negotiate business, exchange and cooperate.
1.Specification of ammeter for through current:0.1A 0.5A 1A 1.5A 3A 5A 10A 15A 20A 25A 30A 40A 50A 60A 75A 100A,
2. Specification of ammeter 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 120A 150A...10KA and external secondary current 1A or 5A.As long as overload rate and the incoming current keep the same, dial scales of all types in this series can be exchanged ye remain the accuracy.
3.Overload rate of ammeters:1. non-overload 2. 1.2times 3. 2times 4. 5times.
4.Specification of voltmeters for through voltage:30V 50V 75V 100V 120V 150V 200V 250V 300V 400V 450V 500V 600V.
5.Specification of voltmeters 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.
6.Overload rate of voltmeters:1.non-overload 2. 1.2times.
7.Product performance:all the meters are equipped with pure white silk- screen printing dial scale.The movement is made of intensive PBT plastics and high-performance magnetic materials so that it is vibration-resistant and heat-resistant.The case is made of ordinary ABS plastics of flame retardant ABS plastics, of which the resistant temperature can be up to 85°C .The base is made of PC plastics or flame retardant PC plastics, of which the resistant temperature can be up to 120°C.The resistant voltage is higher than 2000V.The resistant voltage is higher than 2000V.This kind of meter is easy to install with high-strengthen plastics grip piece by screwing down the nut so that the meter is of high immobility.
8.Principles of measurement and the features: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 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.
9.The ellectromagnetic meters can be used for AC circuits under ordinary circumstance as well as for DC circuit instructed with TRMS.The structure of this kind of meters is simple, yet the accuracy is high, as well, they can be used for 50/60Hz circuit.Special frequency should be marked out when the order is placed.
