1. The size of the meter is the size of the meter. This is a very basic problem. The digital display meter should be installed on the cabinet, so it is necessary to consider the overall coordination. If it is too large, it may not fit. If it is too small, the display number will not be clear. In addition, the large-sized instrument generally has strong function expansion and the same function price. It may be expensive, and a small instrument may be less functionally expandable. At present, the international standard sizes of digital display surface plates are mainly as follows: 48*24mm; 48*48mm; 48*96mm; 72*72mm; 96*96mm; 96*48mm; 160*80mm. Plastic Injection Molding,Custom Molded Plastic,Black Plastic Washer,Thin Plastic Washer Ningbo Yongsheng Rubber And Plastic Products Co., Ltd. , https://www.yscnrubber.com
2. Displaying digits is directly related to the measurement accuracy of the digital display. Generally speaking, the higher the number of display digits, the more accurate the measurement, and the more expensive the price, mainly the following: two (99, special); three digits (999 , very few); three and a half (1999, common digital display dominates); four and a half (19999); four and four three (3999); five and five (common in counters, accumulative tables and high-end Meter), the user can select several digits of the digital display according to the measurement accuracy requirements.
3. The input signal refers to the measurement signal directly input into the instrument. Some industrial signals are directly connected to the instrument for measurement. Some signals are converted into the instrument after conversion. The nature of the measurement signal must be clarified, otherwise the purchased instrument cannot be used. Even damage to the instrument and the original equipment. To find out the type of the number: current or voltage, AC or DC, pulse signal or linear signal, etc., but also to understand the size of the signal. The name of the meter is not the same concept as the input signal.
4. Working power supply All digital display meters need working power. The working power of digital display meter mainly includes: 220Vac; 110/220Vac; 85-265VAC/DC switching power supply, 24Vdc (generally customized), 5Vdc (small panel) .
5. Meter function The meter function is generally modular. Alternatively, the price of the meter will vary with the function. The digital display mainly has the following optional functions: the alarm function and the number of alarm output groups (ie Relay action output), the output voltage and output power of the feeder output, the type of transmission output and transmission output (4-20mA or 0-10V, etc.), communication output and communication method and protocol (RS485 or RS232, yes) Modus is still a different protocol), and there are more optional features for adjusting the control instrument.