Mother Board, 5.6. I2C Watch Dog Circuitry

Theory of Operation

Model GFC7000TA Carbon Dioxide Analyzer

	STATUS LED’s	DC VOLTAGE TEST
	STATUS LED’s	POINTS
		POINTS

RELAY PCA

Figure 9-15: Location of relay board Status LED’s

9.3.5.6. I2C Watch Dog Circuitry

Special circuitry on the relay board monitors the activity on the I2C bus and drives LED D1. Should this LED ever stay ON or OFF for 30 seconds, the watchdog circuit will automatically shut of all valves as well as turn off the IR Source and all heaters. The GFC wheel motor will still be running as will the Sample Pump, which is not controlled by the relay board.

9.3.6. Mother Board

This printed circuit assembly provides a multitude of functions including, A/D conversion, digital input/output, PC-104 to I2C translation, temperature sensor signal processing and is a pass through for the RS-232 and RS-485 signals.

9.3.6.1. A to D Conversion

Analog signals, such as the voltages received from the analyzer’s various sensors, are converted into digital signals that the CPU can understand and manipulate by the analog to digital converter (A/D). Under the control of the CPU, this functional block selects a particular signal input (e.g. BOX TEMP, CO2 MEAS, CO2 REF, etc.) and then coverts the selected voltage into a digital word.

The A/D consists of a voltage-to-frequency (V-F) converter, a programmable logic device (PLD), three multiplexers, several amplifiers and some other associated devices. The V-F converter produces a frequency proportional to its input voltage. The PLD counts the output of the V-F during a specified time period, and sends the result of that count, in the form of a binary number, to the CPU.

Teledyne Analytical Instruments

207

gfc 7000ta specifications

The Teledyne GFC 7000TA is a cutting-edge, high-performance gas flow calibrator designed for both laboratory and field applications. This instrument is renowned for its accuracy, versatility, and reliability, making it an ideal choice for various industries, including aerospace, environmental monitoring, and manufacturing.

One of the standout features of the GFC 7000TA is its advanced measurement technology. It utilizes state-of-the-art thermal mass flow meters, which allow for precise fluid measurement across a wide range of flow rates. This technology ensures highly accurate readings, which are essential for applications requiring stringent compliance with regulatory standards.

The GFC 7000TA is capable of accommodating various types of gases, making it particularly versatile. Users can calibrate flow for gases such as air, nitrogen, or carbon dioxide, providing flexibility in a multitude of applications. The device also supports dual-channel capabilities, allowing simultaneous measurement and calibration of two different gas types, enhancing productivity and efficiency in processes.

Another notable characteristic of the GFC 7000TA is its user-friendly interface. Equipped with a high-resolution touchscreen display, the device offers intuitive navigation and data visualization. Users can easily set parameters, view real-time measurements, and generate printed reports. This interface reduces the learning curve for new operators, allowing organizations to implement the GFC 7000TA with minimal training.

In addition to its advanced measuring capabilities, the GFC 7000TA features a robust design for durability in harsh environments. The instrument is compliant with various international standards, ensuring its reliability and performance in various conditions. Its portable form factor makes it convenient for fieldwork, while the rugged construction provides peace of mind for users working in demanding settings.

The GFC 7000TA also incorporates modern connectivity options. With built-in USB and Ethernet ports, users can easily integrate the device into their existing systems for data logging and remote monitoring. This connectivity feature enables real-time data access and enhances the potential for analysis and optimization of gas flow systems.

In summary, the Teledyne GFC 7000TA is a high-performance gas flow calibrator characterized by its advanced thermal mass flow measurement technology, versatility in accommodating various gases, user-friendly interface, and robust design. With its modern connectivity features, this instrument stands out as a vital tool for professionals seeking precision and reliability in gas flow applications.

Teledyne gfc 7000ta operation manual Mother Board, 5.6. I2C Watch Dog Circuitry, To D Conversion

Models: gfc 7000ta