In the industrial process control, due to the continuous operation of production, there are high requirements for the reliability of equipment, and many redundant technologies are used to ensure the reliability of measurement and control.
In addition to the element balance of DCS system, the requirement of element balance is also put forward for the on-site sensors. DCS system hopes to know the working status of each sensor in time and find out the fault in time obstacle. In the traditional weighing method, the signals of multiple analog sensors are connected to each other through the junction box and become one signal, so the signals of each sensor are no longer independent.
In addition, the instrument cannot find problems online and locate faults, so it is difficult to meet the requirements of high reliability in continuous production. Stored in the digital weighing sensor of teller Toledo.
The unit has a microprocessor, which can diagnose itself. Each meeting has its own address. The instrument can monitor the output of each sensor box on-line and conduct intelligent processing, which not only greatly improves. It not only improves the reliability of the weighing system, but also can easily solve the requirements of some analog sensors, such as large tare weight, small quantity and signal load detection.
Add your own unique high precision high-speed output / D conversion technology
•Comprehensive sensor digital signal supplement technology and long-distance high-speed explosion-proof communication capability make the performance exceed the limit of analog sensors and reach the accuracy of oin C6 has passed many international certifications, and it is a real digital weighing sensor: for more than ten years, the digital weighing sensors of Cuntler Toledo have been widely used in the world more than 500000.
Compared with the analog sensor, the following characteristics of the digital weighing sensor can better meet the requirements of process control: high reliability and anti-interference.
Strong force and good lightning protection performance. The analog sensor is powered by the instrument, and the exciting voltage of its bridge is equal to the power supply of the external instrument. In the industrial field, the instrument and sensor are susceptible to strong electrical interference and surge direction will cause data instability and even burn the sensor instantaneously. The digital sensor adopts fully sealed stainless steel laser welding technology and is filled with ammonia gas to protect the inside.
The circuit works reliably and the protection level reaches IP68. The tube is equipped with various protection circuits and lightning protection design. The power supply provided by the instrument is processed first and then used for the bridge after being stabilized.
The excitation eliminates the surge disturbance from the power supply and lightning, makes the sensor output stable signals, and ensures the normal operation of the sensor. Uninterrupted digital weighing.
The system can ensure the continuity of production and realize non self innovation. The instrument not only monitors the working conditions of various digital sensors at all times, but also detects a sensor fault.
The instrument can automatically start the uninterrupted working mode, and can still guarantee the weighing at a certain time and with a certain accuracy, without causing production shutdown. At the same time, the instrument will send a signal.
To the user, locate the faulty sensor and require replacement. Simulate the major event that the sensor system cannot weigh once the sensor is faulty, resulting in shutdown.
- it is a very complicated thing, and many material tank systems are difficult to add weight or no; The calibration can be carried out by using the string hanging code and the digital sensor can be used for the calibration.
Yes. This is because the digital sensor has been output to the sensor by the international standard dynamometer in production; The calibration is made, and the output effective word quantity and standard force value are corresponding instrument.
What the meter reads is the weight value actually measured by the digital sensor. There is no loss in the middle. Therefore, calibration can be avoided in China.
• while analog sensors and weighing instruments
When the analog weighing system is composed, each link of the connection will have signal loss. The signal measured by the instrument is not completely equal to the output of the sensor
Therefore, the field setting of the system must be carried out during the application. The transmission distance is long, the communication speed is fast, and the anti-jamming effect is significant. The level = signal of the analog sensor is too small, and it is easy to subject to radio frequency interference and electromagnetic interference. However, due to the influence of cable resistance, the signal transmission distance is short. Simulated weighing cheating is extremely difficult to control. The digital sensor has a digital signal, which is not only higher than the analog signal, and is not easy to be disturbed, but also transmitted according to the bifbus field bus communication protocol. The communication speed is ten letters of ordinary R $485. It is high-speed and has the ability of communication error correction, ensuring fast and reliable data. Due to the confidentiality of the agreement, the site cannot cheat. The angle difference is easy to adjust.
For the scale body composed of an analog sensor, due to the non separability of the signal, the code shall be added to each sensor and the potentiometer in the junction box shall be used to adjust the angle difference during calibration, due to the interaction between the sensors, it needs to be adjusted repeatedly, which is time-consuming and laborious. It is much easier for the scale body composed of digital sensors to have cosmetic surgery.
The instrument can read the force of each sensor at the four corners, so as long as one load is added to each corner, the instrument can calculate the angle difference coefficient of each point, and can automatically scale.
The angle difference adjustment eliminates the trouble of repeatedly loading and breaking the code, and improves the efficiency.The angle difference adjustment can be completed with one chasing load, which is very simple and fast.
Easy maintenance analog sensor
In production, the temperature compensation is carried out together with the cable, so as to eliminate the temperature influence of the cable resistance. If the cable of the mold pick sensor is damaged and connected at will, then resulting in measurement errors. Therefore, when the distance is long, the sensor needs to be customized. When the sensor is replaced, it needs to be rewired, which is very inconvenient in actual use.
Digital transmission
The sensor uses the aviation plug of the vehicle logo, which not only ensures the protection level of if68, but also makes the sensor and the cable become two independent devices. Replace the sensor or the cable
That's right. I don't need any cables. Since the transmission is a digital signal, the length of the electrical system line can be changed as required without affecting the measurement accuracy. When the digital sensor is replaced, only the phase.
If the off parameter is input to the new sensor, there is no need to re-calibrate the system. The overall cost of the system is low. From the perspective of system cost, however, since the digital sensor reduces the debugging and application cost in the application (for example, it is convenient to debug the angle difference), it is possible to avoid calibration, replace the sensor without re calibration, and the self diagnosis and uninterrupted work of the word sensor improve the system reliability and reduce the downtime. In China, the overall cost of the system is lower than that of the analog sensor system.
Post time: Aug-24-2022