Sealed Chamber Extravascular Pressure Control Unit

The extravascular pressure (EvP) in the sealed chamber is sensed by a solid-state pressure transducer. The signal from this transducer is connected to the pressure control unit where it is compared with either the internal pressure signal set by the pressure dial, or one of the external pressure signals fed into either the function generator or signal generator input jacks. Any difference between these two signals regulates the electronic servo valve output pressure so that the two pressures are the same.

Internal Pressure Signal Mode

The signal corresponding to the pressure dial setting calibrated in mmHg establishes the extravascular chamber pressure. This pressure is sustained until a new pressure is selected. The panel meter reading shows the chosen extravascular pressure in mmHg which can be accessed for data acquisition at the rear panel pressure signal jack.

External Pressure Signal Mode

Various extravascular pressure waveshapes can be created to match external input signals in this mode. The actual extravascular pressure can be accessed for data acquisition at the rear panel pressure signal jack.
Function generator signals can be obtained from a computer program written by the user and a computer having a D/A computer board that supplies analog voltages of 10 mV/mmHg. In this way, various simple or complex, time-dependent pressures can be applied to the chamber.


Pressure range:
0–250 mmHg

Pressure output signal:
10 mV/mmHg

External input signal:
10 mV/mmHg

100–120 VAC/60 Hz or 200–240 VAC/50 Hz

13 cm H x 11 cm W x 36 cm L / 3.1 kg