37


With only up to 100 mBar of overpressure, the liquid will gently rise out of the rise pipe and fall into the fi ll hose. Figure 3 shows the LN2


Dewar setup.


Example 2: High-purity germanium (HPGe) detectors


High-purity germanium (HPGe) detectors used for high-resolution spectrometry of gamma radiation need to be cooled well below the ambient temperature to work. Historically, this has been achieved by thermally connecting the detector to a liquid nitrogen (LN2


. The need


a storage Dewar lead to the development of electrical cryostats in recent years. However, they can still not completely match the performance and security of LN2 security are key, an automated LN2


to periodically manually refi ll the LN2


Example 3: Controlled cooling for a


thermomechanical analyser (TMA)


A thermomechanical analyser allows a high number of product property measurements.


) pool at -196ºC (77 K).


In practice, a solid copper rod attached to the detector crystal mount would dip into a Dewar fl ask fi lled with LN2


from Figure 3: LN2 Dewar setup


based systems. In applications where performance and/or refi ll system is the answer.


capacity of 7 l and a 5 day hold time which would normally necessitate a LN2 once or twice a week. This is where the Norhof 900 LN2


One such automated, robotic, non-destructive waste assay system was recently developed by DuAl GmbH in cooperation with Norhof. RoboCount(TM) 2020 is used for measurement of radioactive waste packages. The detector carried by the robot is cooled by a Dewar with a LN2


refi ll pump came in. Equipped with a


docking station detects it. The robot then uncouples the detector assembly from the docking station and operations can continue immediately.


50 l Dewar, it could extend the hold time to (50/7)x5 = 35 days or more than a month. The pump could not be permanently attached to the detector Dewar because if positioned at the base of the robot, the fi ll line would be too long and its freezing following a refi ll would prevent robot operations until it warmed up again. To solve this problem a docking station was designed with two cryogenic couplings. The inlet coupling is connected to the Norhof 900 pump and the outlet coupling houses a temperature sensor, also connected to the pump electronics. The mating parts of the couplings are part of the detector assembly and connected to the inlet and outlet ports of the 7 l Dewar, respectively. When the time comes to refi ll LN2 mate. LN2


, the robot positions the detector assembly such that the cryogenic couplings fl ow is initiated and continues until the temperature sensor in the outlet of the


New Applications A solar panel company use the LN2


microdosing system to autofi ll the cold traps in the


vacuum lines in order to protect the pump from solvents condensating in the pump oil and for extra low vacuum.


A crystal cleaning company use the LN2 in a machine for cleaning purposes.


microdosing system to spray/drip LN2 over crystals


For example: coeffi cient of thermal expansion, glass transition determination and thermal stress analysis. For a high number of materials it is necessary to cool the analyser down to low temperatures. The LN2


microdosing system will be hooked up to a TMA via an adaptor plate and allows temperatures down to -150°C (or lower if necessary).


fl ow optimised for the application - without noise, vibration and excessive waste.


The benefi ts include: no manual fi lling (and spilling); automated system for your safety; delivers LN2


liquid with a Figure 4: Robot setup with docking station Now the TMA can be left to run overnight.


Conclusions The systems are extremely fl exible and can be used for most LN2


cooling applications.


Two Chambers can be Better than One


If your laboratory is facing an increase in demand for sterilised items but has little or no space to accommodate a larger autoclave, Astell Scientifi c can provide a solution with its innovative ‘Duaclave’ twin chamber range.


A ‘Duaclave’ is made up of two autoclaves stacked one above the other, built in to one frame, to provide a secure and stable unit with twice the capacity of an autoclave occupying the same fl oor space.


Each of the circular chambers can be operated independently, controlled by its own colour touchscreen, meaning it becomes possible to run different sterilisation cycles simultaneously - reducing turnaround time and improving operational capacity. For example, it’s possible to sterilise a glassware load in one chamber whilst preparing media in the second.


Duaclaves are available in a choice of fi ve sizes, and are based on Astell’s ‘heaters in chamber’ front-loading autoclave range, providing (combined) chamber volumes of 66 litres up to a maximum of 306 litres in capacity. Further customisation and options are available upon request.


For more information on the Duaclave range please contact Astell Scientifi c or your distributor.


More information online: ilmt.co/PL/BM1e 49444pr@reply-direct.com


Healthier Air in the Lab


Exposure to unwanted chemical emissions are an unfortunate reality when working in a lab. Even if you can’t smell them, Erlab’s Halo laboratory-grade molecular air fi ltration system can.


Halo is working 24/7 to clean the air in the lab. Once vapours are detected, Halo will capture them in Erlab’s proprietary carbon fi ltration technology. After adsorbing the molecules that cause unwanted odours, clean air is returned back to the room through low-disruptive side vents.


44889pr@reply-direct.com


Blue is the colour. The Rapidox 1100Z oxygen gas analyser


Cambridge Sensotec’s flagship Rapidox 1100Z oxygen gas analyser is now blue, with modern features and fully upgraded software. With an OLED screen, an updated, superior zirconia planar sensor and many more features, there’s no reason to feel blue. Instead, buy blue.


www.cambridge-sensotec.co.uk sales@cambridge-sensotec.co.uk +44 (0)1480 462142


WWW.LABMATE-ONLINE.COM


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