Analysis of the characteristics and main functions of fingerprint attendance machine
Fingerprint attendance machine features
Fingerprint attendance has the characteristics of fast recognition, accuracy and convenience, which makes the attendance intelligent. However, the use of the fingerprint film is limited by the life of the fingerprint film. The high-end fingerprint attendance machine has made breakthroughs in this aspect.
The fingerprint identification system collects, analyzes and compares live fingerprints through special photoelectric conversion equipment and computer image processing technology, and can quickly and accurately identify personal identity. The system generally includes processes such as fingerprint image acquisition, fingerprint image processing, feature extraction, and comparison and matching of feature values. Modern electronic integrated manufacturing technology makes fingerprint image reading and processing equipment small, and the rapid development of personal computer computing speed provides the possibility of fingerprint comparison operation on microcomputer or even single-chip microcomputer. Excellent fingerprint processing and comparison algorithm ensure recognition. The accuracy of the results.
Therefore, the fingerprint attendance machine can complete the attendance and attendance when the finger skin is in the correct angle direction and is close to the finger.
The key part of the fingerprint attendance machine, also known as the most vulnerable part is the fingerprint film. The longer the fingerprint film is used, the lower the fingerprint recognition rate. In the absence of any scratching and destruction, a fingerprint film generally has more and more fingerprints cannot be recognized or needs to be repeatedly identified after one year. It is necessary to replace the fingerprint film. It takes hundreds of dollars to replace a piece of fingerprint film. It is not included in the service fee. It is a separate material fee. It is usually changed once a year.
The main function of fingerprint attendance machine
Fingerprint attendance machine uses fingerprint identification technology to solve the problem of enterprise attendance management. The main functions of the fingerprint attendance machine are as follows:
The fingerprint of the attendance personnel is collected by the internal fingerprint collector, because of the uniqueness of each fingerprint. There is no special accident, everyone can have 2-3 fingers, and the collection work is convenient.
After the fingerprint attendance machine senses the fingerprint, it is convenient to compare with the collected and stored fingerprints, and it can be foolproof. After determining the identity of the person, and recording the time and date, the attendance data is processed by the software to form a report, and the data is reliable.
In the case of using the fingerprint sleeve without cheating, the fingerprint attendance can basically guarantee the phenomenon of punching on behalf of the person, and there is no need for a card and other consumables, as long as the purchase of the machine is connected to the computer, the use can be started.
This last step is a dispensable (because the recorded results can be found in the attendance machine), and if necessary, the printer can print the report with the data already processed.
Dissolved oxygen controller is a device used to monitor and control the dissolved oxygen content in water. Dissolved Oxygen Controllers require a Dissolved Oxygen Sensor to be connected. The sensor is used to measure the dissolved oxygen concentration in the water and transmit the data to the controller. The DO controller controls the dissolved oxygen content in the water body by adjusting other parameters according to the preset dissolved oxygen target range. The dissolved oxygen meter has 2 relays, which can set the closing value and breaking value, and 2-way 4-20mA current output, which can control the device more accurately.
The specific control method depends on the requirements of the application and the design of the system. A common control method is to control the dissolved oxygen content by adjusting the amount of aeration. Aeration is the process of increasing dissolved oxygen by passing air or oxygen through the water. The dissolved oxygen controller can automatically adjust the aeration amount or stirring intensity according to the dissolved oxygen data measured by the sensor to keep the dissolved oxygen concentration within a predetermined range.
It should be noted that the control of dissolved oxygen level involves many factors, including water body temperature, pressure, salinity and other water quality parameters. Daruifuno's dissolved oxygen controller supports compensation function. The dissolved oxygen controller also has RS485 output and time history recording function, and supports various installation methods.
Dissolved Oxygen Controller,Dissolved Oxygen Meter, Dissolved Oxygen transmitter
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