The basic test principle of the recorder

In today's environment, the monitoring of environmental related data is increasingly important. Monitoring of temperature and humidity in industrial environments, scientific experiments, inspection and testing, medical and health, storage, agricultural cultivation, breeding seedlings, and device warehouses The use of controlled temperature and humidity recorders is becoming more and more common. The use of this recorder is to be able to achieve the relevant operating environment conditions to meet the relevant requirements, to ensure that the production process and process, product quality meet the relevant requirements and the experimental results are accurate and reliable.

The basic working principle of the recorder is as follows: The analog circuit provided by the peripheral sensor is converted into a digital circuit through AD conversion, and then the later-stage data processing and adjustment are performed by a common single-chip microcomputer technology. The general temperature and humidity recorder has an indicating meter for displaying. The current temperature and humidity values, but a small number of recorders have no display, can only be read through communication with the computer serial port. The storage unit of the recorder generally uses rewritable EEPROM. Due to the different size of the storage unit, the number of stored data can range from 5,000 groups to 50,000 groups, and the recording interval is from 2 seconds to 2 hours, thus the storage time recording room Short is only a few dozen days, long can reach several years, even more than ten years, of course, these are also affected by the length of battery life. Each recorder has its own software to read the value, time curve, including the late printing, some also have a variety of alarm forms: sound and light alarm, SMS alarm, mail alarm, telephone alarm and so on.

The data measured by the recorder after using one cycle will deviate from the actual data. This is because the electrical part of the recorder will change due to the passage of time, temperature, and mechanical vibrations, and also because the humidity sensor cannot Sealed and protected. Therefore, the working status of most recorders requires periodic calibrations to correct temperature and humidity deviations to ensure the instrument's performance and accuracy.

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