Technical Section
Calibration
The calibration section explains how to calibrate the PresSura pressure sensor, including
setting the proper elevation, and how to zero a TSI flow station pressure transducer.
NOTE: The PresSura pressure sensor is factory calibrated and normally does not need
to be adjusted. However, inaccurate readings may be detected if pressure
sensor is not installed correctly or problems with the sensor exist. First, check
that the sensor is installed correctly (usually only a problem on initial set up).
Second, go into DIAGNOSTICS menu, SENSOR STAT item. If normal is
displayed calibration can be adjusted. If an error code is displayed, eliminate
error code and then verify pressure sensor needs adjustment.
Adjusting the PresSura controller calibration may be required to eliminate errors due to
convection currents, HVAC configuration, or equipment used to make the measurement.
TSI recommends always taking the comparison measurement in the exact same location
(i.e., under the door, middle of door, edge of door, etc.). A thermal air velocity meter is
needed to make the comparison measurement. Normally the velocity is checked at the
crack under the doorway, or the door is opened 1” to allow alignment of the air velocity
probe making the measurement. If the crack under the door is not large enough, use the
1” open door technique.
Calibrating pressure sensor - primary sensor or second sensor
Enter calibration menu (see Software Programming if not familiar with key stroke
procedure). Access code is turned on so enter proper access code. All menu items
described below are found in CALIBRATION menu.
Elevation
The ELEVATION item eliminates pressure sensor error due to elevation of
hospital. (See ELEVATION item in Menu and Menu Items section for further
information).
Enter the ELEVATION menu item. Scroll through the elevation list and select the
one closest to the hospital’s elevation
Press the SELECT key to save the data and exit back to the calibration menu.
Sensor zero
Slide open pressure sensor door and tape over 1/2 inch sensor orifice (see
Figure 7). Make sure pressure sensor orifice is taped over. Sensor is located
about 3/4” into housing.
Select SENSOR ZERO item (2 SENSOR ZERO item if second sensor).
Press SELECT key. Sensor zero procedure, which takes 120 seconds, is
automatic.
Press SELECT key to save the data.
Remove tape from sensor orifice and close pressure sensor door.
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