Precise Phototrophic Cultivation of Algae and Cyanobacteria
Service Support

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Shipping policy

Shipping Policy

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Return Procedure

Before returning any instrument to PSI:

  • Make sure that the instrument is in fact faulty and has not just been set up improperly.
  • Contact PSI support(at) before sending anything back. You will be given the RMA number, which must be clearly marked on the outside of the shipped container.
  • When sending the faulty device back to PSI, please pack it very carefully. Use a have duty box and lots of wrapping/foaming material.
  • If the returned instrument is damaged during shipment due to insufficient packing, PSI will have to charge the repair (or its part) as a non-warranty one.
  • If you have encountered a program failure, we would need a printed copy of any faults you have seen, including how to reproduce them. Include it into the return package along with your mailing address.
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  • All returns must be shipped prepaid. Unpaid packages will not be accepted.
  • In case of questions contact us by E-mail: support(at) or shipping(at), by phone: +420 511 440 034, +420 511 440 032,+420 511 440 022, +420 388 440 046, or by fax: +420 511 440 901.
  • What is the most favorable location of the glass straw in the vessel of Multi-Cultivator so as to ensure a complete mixing of the culture: at the very bottom, at the the two-third...?
  • The best position of the glass straw is on either side of the vessel (because the OD sensor is aligned with the center of each cultivation tube). Please, check that all cultivation vessels, silicone plugs and aeration glass tubing are at the same position. All aeration glass tubing should be the same distance from the bottom of the cultivation vessel. The position of the aeration tubing end affects the size of the bubbles. Optimal position of the end should be in about 0.5 mm from the bottom of the vessel. Ensure that there are no kinks in the silicon tubing that may impede the flow of gas. And ensure the end of the glass straw is sufficiently away from the bottom of the vessel not to hinder the bubbles coming out of the straw.

  • In the Multi-Cultivator, it is hard to apply exactly the same air flow in the different culture tubes, even by opening or closing the taps. So I take a look at the number of bubbles produced in each vessel and I adjust the taps in this way. Do you have any solution, less 'subjective', to fix this issue?
  • Regarding the gas flow rate into each tube - you can install some mini flowmeters on the tubing between the taps and glass straws and try to improve the control of the flow rate a little bit. In general, the Multicultivator is a low-cost device and that's why it doesn't include precise control of the gas flow rate into each tube.
  • Can the Multi-Cultivator aeration unit (black metallic tube with 8 small valves) be autoclaved?
  • The Humidifier (1L glass bottle with accessories) and silicone tubes can be autoclaved to 121°C. The black aeration tube with valves can be autoclaved to 75°C only. This tube can also be sterilized with 70% ethanol.
  • Is there some limitation in measuring optical density in the Multi-Cultivator?
  • Up to OD 1 measuring is linear. Non-linear measuring can go up to about 2.5.
  • Can you provide more information on how the optical density measurements are performed in the Multi-Cultivator?
  • The method is based on light absorption of certain wavelengths (680 and 720 nm) by chlorophyll and cell walls. Basically, we compare light intensity measured with/without sample in the test tube. The whole process of OD measurement is automated. You can either start it manually, or you can setup a protocol where OD measurement is performed in periodic intervals. Measured data can be later downloaded to a PC.
  • Is the water level in the Multi-Cultivator test tubes topped up automatically, allowing minimal user supervision?
  • There is no automatic level detection in the test tubes, no medium is added during an experiment. The only substance coming into the tubes is humidified air, which along with condensation system grants minimal medium evaporation.
  • Can the User-Defined Custom Protocol for Multi-Cultivator be fully defined by the user (not needing to order programming from PSI)?
  • Yes, a user does the programming all by himself. The protocol is created in a PC, as a text file with given syntax, and then uploaded to the device using provided software.
  • Regarding the (224 maximum) light phase intervals the User-Defined Custom Protocol for Multi-Cultivator; What is the minimum duration of a light or dark period? Can I program any sequence of light (any intensity and duration) and dark periods?
  • The smallest time step is 1 second. Any sequence with maximum of 224 intervals can be programmed. Interval is defined by light intensity in percents of maximum and duration in seconds.
  • Regarding the User-Defined Custom Protocol for Multi-Cultivator; Can I define separate protocols for each of the different tubes, or the same protocol has to be applied to all tubes?
  • Each tube is controlled separately by its own protocol.
  • It appears that the Photobioreactor system can only support either dCO2 or dO2 measurements, and not both simultaneously - is this correct?
  • No, you can measure both dO2 and dCO2 simultaneously, but you need the CO2 module to do that.It also appears that in the Photobioreactor, dCO2 and dO2 probes cannot be value-corrected within the software (output of sensor doesn't appear to be units of mg/l or mmol/l, although this can be corrected for offline measurements.For dCO2 you can put calibration constants in software and then the values are automatically recalculated to correspond umol/l units. This requires new version of PBR GUI. This can be updated remotely, but you need to have the Photobioreactor computer connected to the internet or you have to ask for an installation CD with instructions. With dO2 concentration we don't have it in the GUI since the calibration is more difficult due strong influence of environmental properties on solubility (such as salinity, temperature, etc.). Also there is significant influence of temperature on the probe electronic circuits resulting in changed sensitivity. All these effect has to be corrected by a user in data post-processing.
  • We are afraid of excessive evaporation from the Photobioreactor. Have you addressed this issue somehow?
  • We are routinely using the gas humidifier (bottle with dH2O) on tubing line before each Photobioreactor.
  • What is the pressure rating of the Photobioreactor vessel?
  • Operational pressure should be always below 0.25 bar.
  • Which Photobioreactor panel (blue/red or white/red) works better for cyanobacteria growing?
  • Cyanobacteria use phycobilins as additional photosynthetic pigments with absorption maximum in red region, therefore cyanobacteria are more sensitive to the red light and usually a combination of white/red light is recommended for cyanobacterial cultivation.
  • Is there a chance to see how new Photobioreactor Software works?
  • Yes, there are video tutorials in the Video Gallery on the PSI web site.