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| {{Technical support}}
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| __TOC__
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| == Very low temperatures ==
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| '''Question:''' Is it possible to use the oxygraph with a chamber temperature of 0 °C?
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| Our system is specified for a chamber temperature down to 4 °C at 25 °C room temperature and down to 2 °C at "lower ambient temperature", see
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| [http://www.oroboros.at/index.php?id=o2k-specifications| specifications].
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| Lower ambient temperature does not necessarily mean a "cool room". For a chamber temperature of 2 °C, an air conditioned room will usually suffice.
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| While we can only guarantee the working of the instrument within these limits, it is possible to reach a chamber temperature of 0 °C at a "lower ambient temperature". In general, however, this may require a "cool room". For this purpose, the main unit itself can be exposed to ambient temperatures down to just above 0°C (all the electronic components are rated at least down to 0 °C, but 0 °C room temperature should be avoided due to condensation concerns). Also, for very low room temperatures above 0 °C, some means of humidity control should be used.
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| We recently performed a short test and were able to reach 0 °C chamber temperature quite easily at a room temperature of about 14 °C. In order to maintain this temperature, the cooling power of the Peltier element reached 95% of maximum. Thus, a "cool room" would probably be necessary for longer experiments.
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| '''Update for O2k Series E:'''
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| Because Series E Oxygraphs have a more efficient temperature management system the experiment described above was repeated with a Series E O2k. In this case it was not necessary to reduce the room temperature. [[User:Fasching Mario|Fasching Mario]] 14:39, 4 February 2013 (CET)
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| Details: O2K - 0°C block temp. - stable Peltier power was reached after about 1:05 h from setting block temp. from stable 37°C to 0°C. - stable Peltier power was about -83 %. - room temperature was 21.1°C [[User:Capek Ondrej|Capek Ondrej]] 14:36, 4 February 2013 (CET)
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| {{#set:Technical service=Main unit}}
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| __SHOWFACTBOX__
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| [[Category:Technical service]]
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