Why can't I use a standard calibrator with the Zefon Bio-Pump®?

The type of impeller fan motors used in the Bio-Pump® are easily affected by backpressure. Backpressure is created by small orifices (even 1/4" openings), tubing and the length of tubing used. Since most standard calibrators either use 1/4" fittings or require power to move a piston, the backpressure they create on the pump is not representative of actual use and this alters the flow reading.

Zefon has designed the Bio-Pump® flow meters to simulate the exact backpressure the pump is subjected to during use with a cassette inline. Because of this unique design, the rotameter cannot be used with any other pump.

Verification of the flow indicators provided with the Bio-Pump® may be performed using a Zefon bubble tube, which is considered a primary standard and is available with NIST certification.