Talk:O2k-Peltier Temperature Control

Previous Product ID 21020

                  

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Talk:O2k-Peltier Temperature Control

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MitoPedia O2k and high-resolution respirometry: O2k-Open Support 

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Very low temperatures

Question: Is it possible to use the oxygraph with a chamber temperature of 0 °C?

1. 1. Our system is specified down to 4 °C at 25 deg room temperature and down to 2 °C at "lower ambient temperature", see

specifications.## A room with lower temperature of the air does not necessarily mean to be a "cool room". For the 2 deg, an acclimatised room is commonly enough. Even though we can only guarantee the working of the instrument within these limits entirely, it is still possible to go to 0°C. This requires a "cool room" though. For this purpose the main unit itself can be exposed to temperatures down to just above 0°C (all the electronic components are rated at least down to 0°C but obviously 0°C room temperature has to be avoided due to condensation concerns). Also of course for very low room temperatures above 0 deg humidity has to be controlled somehow. We did a quick test today and could reach 0°C chamber temperature quite easily at a room temperature of about 14 °C. To keep this temperature stable the cooling power of the Peltier element was already working at 95% of maximum, so some kind of cool room will probable be necessary.

Update for O2k Series E: 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. Fasching Mario 14:39, 4 February 2013 (CET)

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 Capek Ondrej 14:36, 4 February 2013 (CET)

Previous Product ID 21020 Template:Technical service

Very low temperatures

Question: Is it possible to use the oxygraph with a chamber temperature of 0 °C?

Our system is specified down to 4 °C at 25 deg room temperature and and down to 2 °C at "lower ambient temperature", see specifications. Lower ambient temperature does not necessary mean a "cool room". For the 2 deg, an acclimatised room usually will be enough. While we can only guarantee the working of the instrument within these limits, it is possible to go to 0°C and has been done. In general, this may require a "cool room". To this purpose the main unit itself can be exposed to temperatures down to just above 0°C (all the electronic components are rated at least down to 0°C but obviously 0°C room temperature has to be avoided due to condensation concerns). Also of course for very low room temperatures above 0 deg humidity has to be controlled somehow. We did a quick test today and could reach 0°C chamber temperature quite easily at a room temperature of about 14 °C. To keep this temperature stable the cooling power of the Peltier element was already working at 95% of maximum, so some kind of cool room will probable be necessary.

Update for O2k Series E: 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. Fasching Mario 14:39, 4 February 2013 (CET)

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 Capek Ondrej 14:36, 4 February 2013 (CET)