WR-25 Instruction Manual

Normally, barometric pressure is the only item that needs to be recalibrated (adjusting for altitude). The proper local barometric pressure can be obtained from the local news. Set the barometric pressure reading you obtained from the local media by using the calibration mode function.

Temperature

If for some reason you suspect that the temperature is not calibrated properly, use a quality bulb thermometer with which to calibrate. Remember, the WR-25 will be most accurate near the temperature at which it was calibrated.

Humidity Sensor Calibration

The humidity sensor is calibrated by inputting two voltages found on humidity sensor into the WR-25. This may be done by utilizing the TWI_LOG program calibration routine. Index 5 is the voltage at 0% humidity that the sensor outputs. Index 6 represents the voltage that the sensor outputs at 73% humidity. The humidity calibration numbers are found on the humidity/temperature sensor and on the back of the instrument console. These calibration numbers are supplied to us by the manufacturer of the sensor and are normally not changed. If it appears that re-calibration is necessary, try increasing or decreasing index 6.

Rainfall

The WR-25 is compatible with most rain collectors on the market today. The rain inc flag is only utilized to tell the WR-25 what type rain collector is installed. Actual measurement calibration is accomplished inside the rain collector by adjusting two stainless steel screws.

Setting 0 turns the rainfall counter off. Setting 1 or 2 tells the WR-25 to react with one count for every momentary switch closure of the rain collector.

Setting 3 tells the WR-25 to react with one count for every rain collector switch transition from an open or closed state. Rain inc value tells the WR-25 how much rainfall to display for each count. Use the TWI_LOG F5 calibration routine index 8 and 9 to change these settings.

THE PROPER SETTING FOR THE TEXAS WEATHER INSTRUMENTS RAIN COLLECTOR IS "2" FOR THE COUNT AND ".01" FOR THE MEASUREMENT.

The daily rainfall register is zeroed every day at midnight. The monthly rainfall register is zeroed on the last day of each month at midnight. The term rainfall register is never zeroed automatically, it must be manually zeroed through the TWI_LOG calibration routine or by pressing last and clear on the display at the same time.

Report Flag

The report flag selects the format of the RS-232 output and may be changed via the display using the print set routine or by using the TWI_LOG program calibration routine (F5) item 15 report flag (normally used when outputting directly to a printer).

Texas Weather Instruments, Inc.

WR-25 Instruction Manual

Page 17 Page 19
Page 18
Image 18
Texas Instruments WR-25 instruction manual Temperature, Rainfall, Report Flag
Page 17 Page 19

WR-25 specifications

Texas Instruments WR-25 is a high-performance digital data acquisition system designed for a wide range of industrial and scientific applications. Known for its reliability and precision, the WR-25 has become a popular choice among professionals in fields such as environmental monitoring, structural analysis, and industrial automation.

One of the most notable features of the WR-25 is its ability to support a variety of input types, including voltage, current, and thermocouple signals. This flexibility makes it suitable for diverse applications, allowing users to monitor various parameters with ease. The WR-25 also boasts a high sampling rate, which ensures that data is captured accurately and in real-time, providing users with timely insights into their processes.

The WR-25 is equipped with advanced signal processing capabilities, enabling it to filter and analyze data effectively. This allows for the extraction of valuable information from noisy signals, thereby increasing the reliability of measurements. Moreover, its built-in data logging features provide users with the ability to store and retrieve historical data, facilitating trend analysis and long-term monitoring.

In terms of connectivity, the WR-25 comes with multiple interface options, including USB, Ethernet, and serial ports, allowing seamless integration with various devices and systems. This ensures that users can easily connect the WR-25 to their existing infrastructure without the need for extensive modifications.

The WR-25 is designed with user-friendly software that simplifies the data acquisition process. The intuitive interface enables users to configure settings, visualize data, and generate reports with minimal effort. Additionally, the software supports various programming languages, making it accessible for both novice users and experienced developers.

High durability is another key characteristic of the WR-25. Built to withstand harsh environmental conditions, it features robust housing that protects it from dust and moisture. This rugged design makes it suitable for deployment in challenging settings, ensuring uninterrupted operation.

In summary, the Texas Instruments WR-25 is a versatile and reliable digital data acquisition system that offers an array of features and technologies to meet the demands of modern applications. With its high sampling rates, flexible input options, advanced signal processing capabilities, and user-friendly software, the WR-25 stands out as a powerful tool in the realm of data acquisition and analysis.
Top Page Image Contents