Manuals / Boca Research / Household Appliance / Heat Pump

Boca Research None manual Liquid transfers, Vessel 1 to sample cell

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2.3.3 Sample in Vessel 3

•All taps and valves should be closed.

•Open valves V2 and V3 along with tap C on Vessel 3 and freeze the sample liquid by slowly raising a dewar of liquid nitrogen around it.

•When it has been determined that the liquid has completely frozen switch the pump to roughing mode and open valve V1.

•Switch the pump to turbo mode and leave for several minutes. The pressure within the system can be read from the baratron gauge on the pump.

•When sufficient pumping has been done and the sample is ready to thaw, close valve V1 and remove the dewar of liquid nitrogen from around Vessel 3.

•The system must be ‘let-up’ to atmospheric pressure using helium gas by opening valves V3 and V9. The pressure of gas in the system can be read from the baratron gauge.

•Tap D should be closed to prevent suck-back of the liquid as the solid thaws.

•The sample can be warmed gently to aid the thawing process and when complete close tap C.

2.4Liquid transfers

The transfer of liquids within the system is best accomplished by using relative differences in pressure brought about by cooling, evacuation or both.

2.4.1 Vessel 1 to sample cell

The transfer of liquid from Vessel 1 to the sample cell is brought about by the difference in pressure between that in the Vessel and a vacuum in the cell. However, in order to control the transfer of liquid the pressure difference should be as small as possible but not so low that the liquid starts to boil.

•Switch the pump to its roughing mode.

•Open value V2 and tap A, and carefully open valve V1 until a suitable pressure is obtained (~0.5 bar).

•Close tap A and continue to evacuate the system and sample cell by opening valves V3, V4, V5 and V6. Switch the pump to turbo mode.

•When the required level of vacuum has been obtained, close valves V4 and V5 in order to isolate the sample cell.

•Opening tap B on Vessel 1 will cause the liquid to move rapidly to fill the volume between tap B and V5.

•Valve V5 can be opened carefully in order to allow the liquid into the sample cell. The movement of liquid can be monitored using the sight glasses positioned either side of the sample cell.

•When it is judged that sufficient liquid has been transferred to fill the sample cell, close valve V5.

At this point, it must be remembered that the lower manifold contains liquid, which must be removed before the system is evacuated.

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Boca Research None manual Liquid transfers, Vessel 1 to sample cell
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Boca Research, a prominent name in the realm of computer hardware and technology, emerged in the mid-1990s, focusing on developing high-performance peripherals and connectivity solutions. Initially known for their innovative products in the modem and network card markets, Boca Research set a precedent for compatibility and reliability in personal computing.

One of the flagship products of Boca Research was their line of dial-up modems, which became a staple in households and offices as the internet began to gain traction. These modems were designed to be user-friendly and accessible, catering to both novice users and tech-savvy individuals. With features that included plug-and-play installation and robust driver support, Boca Research modems facilitated seamless internet connectivity, contributing significantly to the increasing popularity of online services during the late 1990s.

Boca Research also made significant strides in the production of network interface cards (NICs), which allowed computers to connect to local area networks (LANs). Their NICs were engineered for optimal performance and were often lauded for their stability when handling data traffic. Support for various protocols ensured that users could easily integrate Boca Research's products into existing network infrastructures without compatibility issues.

In addition to these core products, Boca Research expanded its portfolio to include various accessories and add-ons that enhanced the computing experience. This included video capture cards, which allowed users to record and edit video content directly on their computers, and high-quality sound cards that delivered enhanced audio experiences for gaming and multimedia applications.

The proprietary technologies developed by Boca Research placed a significant emphasis on user experience, reliability, and performance. The company was known for its commitment to customer support, ensuring that users received timely assistance and effective solutions to any issues they encountered.

As a pioneer in the peripheral and connectivity market, Boca Research's contributions helped shape the landscape of personal computing during a pivotal time of technological advancement. Their blend of innovation and practicality made advanced technology accessible to users, reflecting a dedication that resonates in the industry even today. Though the company's presence in the market has diminished over the years, its legacy continues to influence many aspects of contemporary computer hardware development.