How Does Paperless Recorder Work?
Paperless recorder is a device that records the collected calculation data in the internal storage system of the instrument by time. It has the advantages of being paperless, real-time, high-precision, communicable, searchable and intelligent. Paperless recorder abandons the deficiency of using paper and pen in the traditional recording method, and at the same time improves the quality and stability of the recorder, and more importantly, reduces the running cost of the recorder, facilitates management, improves work efficiency, and avoids the possibility of error in manual recording.
Composition and Common Data
Paperless recorder is mainly composed of industrial microprocessor, A/D converter, read-only memory ROM, random memory RAM, display controller, LCD, keyboard controller, alarm circuit, clock circuit and other components. Paperless recorder to collect common data : temperature, pressure, flow, level, voltage, current, humidity, frequency, vibration, speed, etc.
Working Principle
Instead of using any traditional recording resources such as paper, pen or ink, the paperless recorder stores the collected data and operational data on a time axis in the internal storage system of the instrument. After calculations and simulations, the instrument's internal data is displayed on an LCD panel. LCD panels are often available for more comprehensive displays. Numeric displays, bar graph displays, curve displays, alarm lists, can all be seen on the LCD panel.
Paperless recorders use a single-chip microprocessor as the core to collect and process a variety of data. Recorded data can be sent to the random memory RAM storage, can also be sent to the LCD screen display, but also according to the need to arbitrarily zoom in or zoom out, convenient for the operator to observe the status of the recorded signal. At the same time, it can also be recorded with the set upper and lower limits of the signal to compare, once the limit is exceeded, an alarm signal will be issued.
Paperless recorder in the A/D converter will record the analog signal into digital quantities for the CPU for arithmetic processing. Read-only memory ROM is used to solidify the program. When the power is turned on, the ROM program can make the CPU work, and the random access memory RAM is used to store the historical data processed by the CPU.
Data Storage and Transmission
The paperless recorder measures data from sensors and records the results for future reference. Measurements of pressure, current, temperature, velocity, displacement, tension and other physical parameters are frequently used. The physical properties and excitation signals to be measured are converted into electrical signals such as currents and voltages by paperless recorders and sensors. These electrical signals are then converted or digitized into binary data.
The binary data is saved on the computer's hard disk or other storage media (e.g. USB flash drive) and is easily evaluated by software Depending on the sampling time, the data can be saved for days or decades. It has a backup power supply to ensure that all recorded data is not lost in the event of a power failure. The central processor can display the data on an LCD screen via a display controller, typically on a 7" or 10.2" color LCD touch screen.
The operator makes various settings via the operation buttons or the touch screen and transmits the signals to the CPU so that the CPU can work according to the operator's requirements. When the recorded data exceeds the limit, the CPU sends a signal to the alarm circuit in time to generate an alarm output. The function of the clock circuit is to generate the recording interval, time stamp or date required by the recorder and transmit it to the CPU.
Applications
Paperless recorder is mainly used in metallurgy, petroleum, chemical manufacturing, building materials, papermaking, food processing, pharmaceutical manufacturing, heat treatment, water treatment and other industries. With the development of science and technology, paperless recorders have added more functions, including PID regulation, flow accumulation, etc. But also toward the direction of increasing integration.
In addition, the paperless recorder is equipped with a print controller and a communication controller so that the data in the CPU can be connected to external micro-printers and personal computers through them, and data printing and communication can be realized through the connection.
