Thermal Conductivity Analyzer

Model 212R

 

 

 

 

6.2.1Dynamic Balance Procedure.

The measuring bridge circuit (see schematic) incorporates two 10 turn potentiometersthatareutilizedtocompensateforminutedifferencesinthe resistive and reactive properties of the hot wire elements and the center tapped secondary of the bridge transformer in the reference and zero gas related to the application.

The potentiometers are of the screw driver adjustment type and are equipped with shaft locking assemblies that have been factory adjusted to create enoughfrictionsothattheshaftwillnotchangepositioninshipment.Thepotenti- ometers are located on the amplifier chassis, and are controlled through two holesidentified“RESISTIVE”and“REACTIVE”ontheinnercontrolpanel.

DO NOT OPEN THE INNER PANEL OF THE ANALYZER TO GAIN ACCESS TO THESE CONTROLS. The balance adjustments should not be disturbed if the analyzer is not up to operating temperature. Correct bridge balance can only be achieved at operating temperature be- cause of the inherent thermal junctions within the potentiometers themselves. The minute voltages produced by contact between the dissimilar materials within the potentiometers are effectively balanced out in the procedure when it is accomplished at operating temperature. Because the voltage generated by these junctions varies with temperature, and because the analyzer will resolve a 0.25 microvolt change in bridge voltage, temperature stability is a mandatory prerequisite to the dynamic balance procedure.

To restore zero control within the limits of Range # 1, employ the following Procedure:

1)With zero gas flowing, adjust the sample and reference gas flowme- ters to the same value between 0.1 and 0.3 scfh.

2)Set the ZERO potentiometer to 500.

3)Connect a voltmeter to the instrument signal output. Connect an oscilloscope to the probe point an d set the sweep rate to 5 milliseconds. Set the voltage level so ± 15 volts can be read.

4)If a reading of +15 or –15 volts is indicated on the oscilloscope with the RANGE switch set to Range # 1 the instrument is significantly unbalanced. Set to Range #2 and proceed to step 4). If the voltage is lower in magnitude than + or – 15 skip down to step 6).

Teledyne Analytical Instruments

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Teledyne 212R instruction manual Dynamic Balance Procedure

212R specifications

Teledyne 212R is a state-of-the-art underwater acoustic modem designed for robust communication in various marine environments. This advanced device is based on established principles of underwater acoustics and modern digital signal processing technologies, making it an optimal choice for applications ranging from oceanography to underwater robotics.

One of the standout features of the Teledyne 212R is its high data transmission capabilities, allowing for reliable communication at distances of up to several kilometers depending on environmental conditions. The modem supports various data rates, enabling flexible adaptation to the needs of different applications. This versatility makes it suitable for both low-bandwidth telemetry and high-data applications, such as video streaming from underwater drones.

The Teledyne 212R employs advanced modulation schemes that enhance its performance in challenging conditions. These modulation techniques, combined with sophisticated error correction algorithms, ensure the integrity of data transmission even in noisy environments. This resilience is crucial as it enables the modem to maintain communication in the presence of marine life, background noise, and varying temperatures.

Another remarkable characteristic of the Teledyne 212R is its compact and rugged design. Built to withstand harsh marine conditions, the modem is encapsulated in a pressure-resistant housing, making it suitable for deep-sea operations. Its durability ensures longevity and reliability, reducing the need for frequent maintenance or replacement, which can be costly in remote underwater settings.

Moreover, the modem features an array of integrated sensors that allow for real-time environmental monitoring. This capability can be pivotal for research organizations studying marine ecosystems or for oil and gas companies conducting underwater surveys. The ability to collect and transmit environmental data alongside operational data streamlines data-gathering efforts.

Ease of integration is another key aspect of the Teledyne 212R. It is compatible with a multitude of existing marine technologies and communication protocols, allowing for seamless deployment in diverse systems. This adaptability is essential for users requiring collaborative operations across multiple platforms, such as Autonomous Underwater Vehicles (AUVs) and remotely operated vehicles (ROVs).

In summary, the Teledyne 212R combines high-performance data transmission, advanced modulation techniques, rugged design, and environmental monitoring capabilities. This makes it an essential tool for anyone engaged in underwater research, exploration, or resource management, establishing it as a go-to choice in the field of underwater communication.