Safely Handle a Liquid Nitrogen Dewar

Safety experts say that nitrogen, despite its inert quality, causes more fatalities than any other chemical found in laboratories. That's why it's important that your cryogenic freezer system has a high-quality, reliable liquid nitrogen dewar. Our staff at Princeton Cryo Tech will always make sure that every one of our products, including dewars, are the highest quality. It's the best way we can help avoid catastrophic events occurring in a laboratory.

When a person is surrounded in a purely nitrogen atmosphere, oxygen flow is reversed from the arterial blood and tissues back into the lungs, causing unconsciousness. This is a very dangerous situation and similar effects can occur when working with liquid nitrogen in a laboratory setting. Liquid nitrogen chilled vapor collects near the floor, but can still cause unconsciousness after inhaling the vapor. Interestingly, though, over half of workers who die in confined spaces are attempting to rescue unconscious workers. So not only are the unconscious in danger, so are the people who try to help them.

If you work with nitrogen in your lab, it's important to have up-to-date safety meetings. In addition to meetings, training should take place, along with maintaining the best quality liquid nitrogen containers and equipment. Princeton Cryo makes sure that all of our products, like a liquid nitrogen dewar, will prevent laboratory accidents.

Dewars are designed for storing and dispensing liquid nitrogen. They are easy to operate and are constructed of high-quality materials. For more safety insurance, laboratories should be equipped with high-quality cryo gloves while keeping employees informed of all the proper safety techniques when handling these dangerous chemicals. Most of all make sure you have a reliable liquid nitrogen dewar from Princeton Cryo.

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Gordinier Cryogenic Tank Switcher

To work with the TEC 3000, Gordinier has developed a cryogenic tank switcher, but it only works with correct installation. If installed improperly, the cryogenic tank switcher can cause the cryogenic freezer to fire the hot gas bypass solenoid at all times when connected to the cryogenic freezer. This results in pouring liquid nitrogen onto the floor of the facility. The cryogenic freezer functions normally when the Gordineir equipment is installed properly.

In two seperate places, this tank switcher splices into the wiring of the TEC 3000. Between the controller and the 12 pin connector is the first place at the bottom of the TEC 3000. Between display panel and the RJ45 connector that plugs into the display is the second place is inside the controller. This version of Gordineir’s tank switcher only functions properly if a certified Gordinier technician installs the switcher. Chart MVE has said that the customer voids the 2 year warranty of the controller if a Gordineir switcher has been hooked up to one of Chart’s TEC 3000 units.

Cryogenic Temperature Sensor Probes

Although TEC 3000 use different temperature probes in liquid nitrogen freezers, the function is identical when compared to TEC 2000. The TEC 2000 uses only two wires and hence the temperature probe casing has a smaller diameter. On the other hand, the TEC 3000 uses three wire as a result it has a larger diameter (despite the fact that only two of those three wires are in use). They carry an accuracy of 0.12% in which both are 1000 ohm platinum RTDs. Keep in mind that the temperature with an precision of plus or minus 2°C is displayed by TEC 3000 controller.