What Is a Pen Recorder?

Pen-type recorder, a recording instrument made by the principle of automatic balance of the measuring circuit, is used to record the slowly changing power signal.

Pen recorder

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Pen recorder using measuring circuit

Pen recorder included. The measuring part is composed of a balanced potentiometer Rw. The difference Ul of the comparison voltage Uf drives the servo motor SM after being amplified. The driving part is composed of a servo motor and a mechanical transmission device. When the servo motor rotates, the transmission device makes the stylus move linearly on the one hand, and drives the brushes of the balance potentiometer on the other. The pen also stops at a corresponding position. The position of the stylus reflects the value of the measured voltage Ui.

According to the recording function, pen recorders can be divided into y = (t) type and y = (x) type, the latter is also called "xy" recorder. "y = (t)" type pen recorder: In this type of instrument, the stylus pen moves horizontally and linearly with the measured voltage, which represents the change of the measured voltage. The recording paper is driven by the paper feeding mechanism to make constant vertical movement, which represents the amount of time change. The curve drawn on the recording paper is the process of the measured voltage quantity over time. The form of the recording function is y = (t). A plurality of recorders can be composed of multiple independent recording systems to record the process of changes of multiple variables over time at the same time, but ink pens of different colors must be used in order to distinguish the drawn curves. "xy" recorder: This type of instrument includes two independent recording systems. One system moves the beam on the recording table in the lateral direction (x direction); the other system moves the stylus on the beam in the longitudinal direction (y direction). The recording paper is fixed on the recording table, and the function form of the recording is y = (x). The beam can be equipped with multiple motion guides and multiple stylus pens, which can draw the relationship curve between one variable and several other variables.

Because the pen recorder uses the automatic balance measurement method and is equipped with a high-gain amplifier, the sensitivity and accuracy of recording are high. Sensitivity is generally 0.5mV / cm, up to 0.1mV / cm; if it is equipped with a preamplifier, it can be increased to 5V / cm. The recording error is generally ± 0.25%. The input impedance of the meter is relatively high, generally about 1M, which is suitable for recording of high-voltage signal sources with internal resistance. The recording format is large, generally about 25cm. Because the recording part is driven by a servo motor, the recording speed is low, which is suitable for recording slowly changing power. The recordable signal frequency is below 2Hz.

The three-pen recorder uses a unique print recording method and advanced microprocessor control technology to achieve unparalleled high recording clarity, high precision, high reliability, multi-function and easy operation. Continuous recording and digital printing.

Each channel of the three-pen recorder can directly choose to receive a variety of thermocouple, thermal resistance, voltage and current signals, and can digitally display the measured signal and perform trend recording and digital recording. It can print 100mm on itself Record the scale value, time and the curve of each signal at the same time on a wide recording paper. The three pen recorder will print the channel number next to the track of each channel. The three-pen recorder can set the measurement signal type, decimal point position, display range, recording boundary, alarm value, hysteresis, correction of system error, recording ruler, data printing interval, paper speed, printing depth and time, etc. Parameters and protect the set parameters.

Three pen recorder is widely used in pharmaceutical, petroleum, chemical, metallurgy, electronics, power and other industries and scientific research units.

In addition to inheriting the original advantages of Yokogawa's paper recorder in the design of the three-pen recorder, the measurement, calculation, display, printing and other functions have been greatly improved, and more prominent are new additions. With the network function, it is very convenient to realize the network connection. At the same time, the pen (1, 2, 3, or 4 pens) and dot (6 dots) models are provided with improved panel and key design, which makes the operation easier and enlarges the display screen (VFD, 101 x 16 dots), providing more Complete information display. New paper slot white LED lighting function is added to enhance the recognition of the recording. Universal input design, increase the standard measurement range and increase the type of input. The newly designed recording paper slot space. Simultaneous observation of the previous recorded values improves the servo system to reduce the space and number of parts, and supports ETHERNET or RS-422A / 485 communication interface.