Designed for careful and protective mixing of cell suspensions and culture broths, developed for highest demands as well as warming-free and uncompromising continuous operations for e.g. in CO2-incubators.
Control unit for the connection of 1 stirring drive bioMIXdrive 1, 2, 3, 4 or 6 with 6 watts / stirring point, without any own generated heating effect, extended speed range from 5 to 250 rpm, jerk free stirring, even and smooth stirring also at slow speeds. Power setting (10-steps) for high power with regard to large and viscous stirring amounts and reduced power for the warming free continuous operation e.g. in CO2-incubators.
Digital display for speed- and power setting, SoftStart for reliable and safe accelerating of stirring bar, QuickSet for quick setting of start and maximum speed, storage of last working status when turning off, firm stainless steel housing, easy to clean
2mag bioMIXdrive 1/2/3/4
Warming and maintenance free magnetic stirrer with 1,2,3 or 4 stirring points, large surface, also suitable for viscous culture media. Maintenance free 2mag stepper motor drive for extremely slow and 100% jerk-free and gentle mixing of cell cultures, extended speed range from 5 up to 250 rpm, jerk-free, even and smooth stirring also at slow speeds, suitable for culture flasks with spinning propeller and spinning ball systems.
Fully encapsulated and hermetically closed stainless steel housing, IP68, water, dust and germ-proof, extremely robust construction and performance, easy to clean, submersible in water baths, designed for the warming-free long term operation in CO2-incubators, individual measurements on request.
When selecting filter paper, these parameters should be taken into consideration.
|Ash content/residue on ignition||The ash content is determined in accordance with DIN 54370. To obtain this 10 g filter paper is weighed before and after ignition in a platinum crucible at 800 °C. The results are expressed as % of original paper weight.|
|Dry bursting strength||For determination of the dry bursting strength the paper is clamped over a rubber diaphragm with
an area of 10 cm2. The strain on the paper is then increased by applying an increasing air pressure,
until the paper bursts. The dry bursting strength in accordance with DIN 53113 is stated in KPa.
|Tensile strength||For determination of the tensile strength, a paper strip (measuring 180 x 15 mm) is subjected to vertical strain by applying increasing weight. The force expended at the moment of tearing represents
the tensile strength. Results are expressed in N/15 mm.
|Thickness||The thickness of a paper is measured with a touch pressure device. Especially for soft and creped
papers it is important that the touch pressure is not too high. Otherwise, the papers are compressed
and a falsely low thickness is obtained.
|Filtration speed||For determination of the filtration speed in accordance with DIN 53137 the duration of flow of 10 mL distilled water through a quadrant-folded, freely suspended filter circle of 12.5 cm diameter is measured. Results are expressed in seconds.|
|Basis weight||The basis weight is determined for a sample of 10 x 10 cm. It is measured in g/m2.|
|Gurley test||The Gurley test measures the time required for filtration of 100 mL air at a water column pressure of 31 mm. The sample has an area of ¼ sq. inch.|
|Wet strength||The wet strength of a paper is a measure for the mechanical stability of a paper in a wet or moist condition. For example, it can be determined as the tensile strength or the bursting strength (see above).|
The retention efficiency of a filter paper is influenced by several factors. Since filter papers are deep bed filters, one usually refers to a mean particle retention.
|Capillary rise according to Klemm||The capillary rise according to Klemm indicates how far a strip of filter paper is moistened in 10 min when vertically dipped with one end into distilled water (20 °C).|
|Particle retention||Particle retention refers to the efficiency of filter papers in retaining certain precipitates. It is characterized by the permeability of the paper for precipitates of iron(III) oxyhydrate, lead sulfate, calcium oxalate and barium sulfate.|
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