Features of Weight Transmitter

Changzhou Hengtuo Electronic Weighing Apparatus Co., Ltd. specializes in the production and operation of various types of transmitters. Main; KMO1, KM06 and other types of sensors. With output voltage and current, two-stage amplification and application-specific integrated circuits, it is widely used in batching control systems in cement, metallurgy, chemical and other industries.

Industry generally needs to measure various electrical and non-electrical physical quantities, such as current, voltage, power, angle, etc., which need to be converted into receivable DC analog electrical signals before they can be transmitted to a control room or display device hundreds of meters away. This kind of device that converts the measured physical quantity into a direct current signal is called a transmitter. The industry is usually divided into power transmitters and non-power transmitters.

The traditional output DC signal of the transmitter is 0-5V, 0-10V, 1-5V, 0-20mA, 4-20mA, etc. At present, 4-20mA current is widely used to transmit analog quantity. It is widely used in industry to transmit analog quantity with 4-20mA current.

The reason for using the current signal is that it is not easily interfered. And the internal resistance of the current source is infinite, and the resistance of the wire in series in the loop does not affect the accuracy, and it can transmit hundreds of meters on the ordinary twisted pair. The upper limit is 20mA because of the explosion-proof requirement: the spark energy caused by the on-off of the 20mA current is not enough to ignite the gas. The reason why the lower limit is not set to 0mA is to be able to detect disconnection: it will not be lower than 4mA during normal operation. When the transmission line is broken due to a fault, the loop current drops to 0. 2mA is often used as the disconnection alarm value.

The current transmitter converts the physical quantity into a 4-20mA current output, which must be powered by an external power source. ^Typically, the transmitter needs two power cords, plus two current output lines, and a total of 4 wires are required, which is called a four-wire transmitter. Of course, the current output can share a wire with the power supply, which can save a wire, which is called a three-wire transmitter.