PendoTECH PressureChecker User Guide
Revision 1
Page 8/15
2. Using the Device
2.1.
Testing sensors non-invasively
Positive and vacuum pressures can be generated within PressureChecker and applied to a sensor
under test. The pressure delivered is indicated on PressureChecker’s liquid crystal display for quick
comparison to the monitor. By applying a vacuum to the sensor test port, the linearity and accuracy of
the pressure sensor can be tested. Since the pressure sensor is a true differential device (measures
gauge pressure relative to atmosphere), applying vacuum is equivalent to applying a pressure to the
fluid path so the system can be checked to verify calibration very easily without accessing the fluid
path or breaking sterility if a sterile fluid path. Even though it may not be possible to test the entire
range of the pressure sensor, the proper function and sensor output accuracy of 0.2584 mV/psi/V can
be verified to be within accuracy specification because this applies across the range of sensor
pressures to 30 psi. Beyond the 30 psi, there is a non-linear output that both the PressureMAT and
PendoTECH Control Systems can interpret and display the actual pressure reading. Regardless, the
PressureChecker only can be used in its specified range which is below 30 psi.
NOTE: During the following steps the fluid path of the sensor must be exposed to atmosphere
Steps:
1.
Connect the sensor to the monitor cable
2.
Connect the 4 foot air tube with stop cock and slip luer on one end to the sensor test port and the
PressureChecker pneumatic port on the other end.
3.
Zero the system- properly zeroing the system is important for accuracy determination. To zero do
the following:
a.
Position the handle on the stopcock to vent both the sensor and pneumatic port to
atmosphere.
b.
Tare the sensor at the monitor per its operating instructions
c.
If the PressureChecker display does not read 0.00, turn the zero adjustment located on the
right side using a small screwdriver