Several advantages of digital sensors Several advantages of digital sensors Digital internal load cells have microprocessors inside to diagnose themselves
Several advantages of digital sensors Several advantages of digital sensors Digital internal load cells have microprocessors that can diagnose themselves. Each has its own address. The instrument can monitor each sensor output online and perform intelligent processing. Not only greatly improve the reliability of the weighing system, but also can easily solve some of the requirements of the analog sensor is difficult to achieve such as large tare weight, eccentric load detection. Coupled with high-precision high-speed A/D conversion technology, comprehensive sensor digital compensation technology and remote high-speed explosion-proof communication capabilities, the performance exceeds the limits of analog sensors. Compared with analog sensors, digital load cells have the following characteristics better. Meet the requirements of process control: High reliability, strong anti-interference ability, good lightning protection performance. The analog sensor is powered by the instrument, and the excitation voltage of the bridge is equal to the power supply of the external instrument. In the industrial field, the instrument and the sensor are susceptible to strong electrical interference and surge, which will cause data instability and even burn the sensor instantaneously. The digital sensor adopts fully sealed stainless steel "target=_blank> stainless steel laser welding technology, and the internal circuit is filled with helium gas to protect the internal circuit reliably, and the protection level reaches IP68. Various protection circuits and lightning protection design are added, and the power supply provided by the instrument is firstly carried out. Processing, voltage regulation and then used for the excitation of the bridge eliminates the surge interference from the power supply and lightning, so that the sensor outputs a stable signal to ensure the normal operation of the sensor. The uninterrupted digital weighing system can guarantee the production. Continuity, to achieve uninterrupted work, the meter not only monitors the working status of each digital sensor at all times, but also when the sensor is found to be faulty, the meter can automatically start the uninterrupted working mode, and still can guarantee the weighing under certain precision for a certain period of time. It will not cause production downtime. At the same time, the instrument will send a signal to the user, and the fault sensor needs to be replaced. The analog sensor system cannot be weighed once the sensor is faulty, resulting in a major event of stoppage and production stoppage. Calibration is not a calibration at the production site. Very troublesome thing, many tanks It is difficult to add weight or can not be calibrated for calibration. Digital sensors can be used for calibration. This is because digital sensors have been calibrated with standard dynamometers in production, and the digital output of the sensor is The standard force value is one-to-one correspondence. The meter reads the weight value actually measured by the digital sensor, and there is no loss in the middle, so the calibration can be realized. The analog sensor and the weighing instrument are respectively separately produced and calibrated. When composing the analog weighing system, all the links of the weighing system will have signal loss. The final measured signal of the instrument is not completely equal to the output signal of the sensor, so the system must be calibrated on site during the application. The transmission distance is fast and the communication speed is fast. The effect is that the mV-level signal of the analog sensor is too small, and it is susceptible to radio frequency interference and electromagnetic interference. Moreover, the transmission distance is short due to the influence of cable resistance during transmission. The analog transmission is extremely easy to cheat. Difficult to control. Digital sensor output digital signal, not only higher than analog Hundreds of times, it is not easy to be disturbed, and it is transmitted according to Bifbus fieldbus communication protocol. The communication speed is ten times that of ordinary RS485, high speed and communication error correction capability, ensuring fast and reliable data. Because the confidentiality of the protocol can not be cheated. Adjusting the scale body composed of an analog sensor. Because the signal is indistinguishable, it is necessary to add a weight to each sensor during calibration and use the potentiometer in the junction box to adjust the angular difference. Because of the interaction between the sensors, it is necessary. Repeated adjustments are time-consuming and laborious. The scale body consisting of digital sensors makes the adjustment of the angular difference much easier. Since the meter can read the force of each sensor at the four corners, as long as the load is added to each corner, the meter The angular difference coefficient of each point can be calculated, and the angular difference adjustment of the scale can be automatically performed, thereby eliminating the trouble of repeatedly loading the weight and improving the efficiency. The angular difference adjustment can be completed once loaded, which is very convenient and quick. When the sensor is produced, it is temperature-compensated with the cable, so that the cable can be eliminated. The effect of temperature. If the analog sensor cable is damaged and connected at will, measurement errors will result. So when the distance is long, the sensor needs to be customized. It is necessary to re-thread when replacing the sensor, which is inconvenient in actual use. The digital sensor uses the military standard aviation plug, which not only guarantees the IP68 protection level, but also makes the sensor and cable become two independent devices. It is more convenient to replace the sensor or cable without wearing the cable. Since the digital signal is transmitted, the length of the cable can be changed as needed without affecting the measurement accuracy. When the digital sensor is replaced, it is only necessary to input the relevant parameters into the new sensor without recalibration of the system. The overall cost of the system is low. From the perspective of system cost, although the digital sensor adds a circuit board, since the digital sensor reduces the debugging and application cost in the application (for example, the debugging angle difference is convenient), the calibration can be performed without calibration, and the sensor is not required to be replaced. Recalibration, etc., and the digital sensor's self-diagnosis, uninterrupted work and other functions improve system reliability and reduce downtime. Therefore, the overall cost of the system is lower than that of an analog sensor system. Shanghai Micro Trade Weighing Apparatus Co., Ltd., the company specializes in selling electronic scales series! Good quality and low price, quality assurance! Reputation first! You are trustworthy! ! ! Main products: electronic platform scale, electronic truck scale, electronic belt scale, electronic forklift scale, hook scale, platform scale, explosion-proof scale, cylinder scale, and all kinds of non-standard special electronic scale contact telephone 021-50471356-606 QQ Website:
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