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FEATURES OF LAMBDA PERISTALTIC PUMPS
LAMBDA Peristaltic pumps have:
Large pump head with two centers of asymmetry to decrease pulsation
Rollers of large diameter with soft compression mechanics to protect the elasticity of tubing
No risk of tubing rupture or leakage which interrupts the work
High precision of flow rate with quartz driven stepping or BLDC motor
Pressure does not increase even when the line is blocked since the final pressure is of the liquid is reduced by the spring to 0.1 – 0.2 MPa (according to the tubing used)
Even without any fixation (stoppers), the tubing will not move at all in and out of the head
Long tubing life and long term stable flow rates even with low cost tubing
Low cost tubing can be used with good results
Tubing economy of PRECIFLOW peristaltic pump will be paid back after consumption of about 80 m of tubing
Unique tubing compression mechanism
Instead of small rollers, which are used by most pump producers, bearings of a larger diameter with glass beads are used. This reduces pulsations, friction and mechanical strain on the tubing which leads to better pump performance.
The bearings glide over the tubing so gently, unlike other pumps, it is not necessary to prevent the movement of the tubing by a special fixation. In this manner, the life time of the tubing is considerably increased.
The pressure on the tubing is delivered individually through an off-centre lever and spring made of stainless steel. This assures a minimal pressure is applied to the tubing which still guarantees a good functioning of the pump without unnecessary deformation of the tubing.
The spring also reduces the liquid pressure to approx. 1 bar. It is useful when the tubing line is blocked, for any reason.
Pump head’s unique compression mechanism reduces the mechanical strain on the tubing and the tubing compression is kept in the range of elasticity of the tubing.
A special off-centre lever using a spring of non-corrosive material applies the compression force on the tubing softly and gradually.
Highly precise and long term stable flow rates
The stepping motor or BLDC motor of LAMBDA peristaltic pumps, driven by quartz-controlled electronics, assures a high precision of the flow rate.
The flow rate of LAMBDA peristaltic pumps can be varied in the ratio 1:1000
As a result of LAMBDA's special tubing compression, the lifetime of tubing used (even lowest cost silicone tubing) is greatly extended and the flow rates remain constant for several weeks without the risk of tubing rupture in long term experiments like continuous cultures, chemostat, perfusion.
Flow rate programming and automatic switch ON/OFF
Flow rate programming (up to 99 steps) and automatic switch-on and switch-off without using any timer. The maximum flow rate has been increased to up to 10 000 ml/hr (10 lph). To achieve such a high flow rate in such a small instrument new motor technology has been used.
Q= f(t), where f(t) defined by the user.
Flow rate profile could be used for e.g.: pre-program the feed profile for fed-batch culture directly on the feed pump and run it automatically for 'n' number of times.
Pumps will be switched ON and OFF based on the flow rate program. The pump regulates itself without the need of the timer to switch OFF and ON.
No clamps or stoppers for tubing fixation
LAMBDA laboratory peristaltic pumps work well with low cost tubing. The economy obtained by using low cost tubing instead of tubing with stoppers or expensive special tubing material formulations pays the peristaltic pump back after the use of only about 80 m of tubing!
Remote control of pumps
LAMBDA peristaltic pumps can be remote controlled digitally e.g. from a PC by PNet peristaltic pump control software.
Remote control of the pump speed can be done by an external voltage of 0 - 10 V (optional 0 - 20 or 4 - 20 mA) and ON/OFF control by an external contact or 3 - 12 V voltage.
Remote control and the possibility of flow integration increase the scope of usage of the pump in automatically controlled systems (e.g.: fermentation as feed and harvest pump, pH control, nutrient and buffer addition, cell culture, chemical synthesis, fraction collection, etc.)
The pump flow integrator allows a simple and precise integration of the amount of liquid delivered by the pump as a function of time. The electrical impulses, which move the pump motor, are registered and transformed into a direct voltage. This voltage can be measured or recorded by common recorders or voltmeters.
In processes where the pump is controlled e.g. by a pH-stat during a fermentation or cell culture to keep the pH of the medium constant, it is often important to know when and how much acid or base were added. This data yields important information about the process, its kinetics and time of completion, etc.
Another use of the INTEGRATOR is for the measurement of enzyme activities (e.g. amidases, esterases, lactamases, lipases, proteases and other enzymes). The pump-flow INTEGRATOR can now be electronically implemented inside the peristaltic and tubing pump and therefore, does not require any additional valuable laboratory bench space.
The activated INTEGRATOR within the LAMBDA pumps allows new and unusual pump applications (e.g. gradient making, counter flow elution, liquid chromatography, electronic burette, etc.).