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I Instruction manual VWR
®
Media Pump
Delay between each dose
If you choose the multi-doses mode, select the line “DELAY” and enter the number of seconds between
two doses.
Calibration
When to calibrate?
When you change the program because calibration is made for each program even if the tubing diameter
remains the same.
Each time you put the tubing back in the pump head, because the tubing is inserted differently and can change
flow.
Necessity of a calibration
Dispensing of a dose
See introduction on this subject.
Dispensing in continuous mode
In the continuous mode, the flow appears on-screen. The flow is proportional to the rotation speed of the pump.
The calibration enables you to evaluate this proportionality precisely and put the precise flow on screen.
The operation of calibration is not absolutely necessary: if you fill in the information correctly about the inner
diameter of the tubing, the Media Pump can then figure out the flow for an average viscosity and function
correctly. But to maintain an optimal precision, calibration is recommended.
Principle of operations
The operation consists in pouring a fixed volume of liquid in conditions closest to real conditions, to measure it
and then enter the value of the volume in the machine so that it can calculate the ratio between the volume and
the number of rotations made, that is to say the flow rate.
The method to measure a volume is generally to weigh the poured liquid and convert its weight in volume,
knowing the weight of the liquid.
The conditions that must be met:
• diameter of the tubing: install the tubing shown in the program
• viscosity: pour the appropriate liquid, at the appropriate temperature (not other settings)
• volume: choose a container accordingly to a dose
Procedure
Principle: Tare a container corresponding to the volume of a dose. Fill it with the Media Pump and measure the
volume of the liquid. Then enter the volume in the machine.
In the main menu, choose the option “CALIBRATION” and in the displayed menu, choose the program to
calibrate.
Example:
Follow the instructions on-screen and press the rotating button to go to the next steps.
C A L I B R A T I O N
↑
1 8 m l d i s h e s
m u l t i 9 m l
C o n t i n u e
p r o g r a m 6
↓
p r o g r a m 7