Welch Allyn GSI 38, Service Manual

Page: 48 / 96

PRESSURE CAL
Use the Keys to position the cursor at the Pressure Cal position.
Press the Key to enter the Pressure
update to the following “flashing” display.
‘PRESSURE CAL 3.1
ECV OPEN
A/D
daPa
Cal Mode. The display will
At this point make sure that the probe tip is in open air.
Press M+ Key to start the Ambient Pressure Calibration. When the Ambient
Pressure Calibration is complete the display will update to the following “flashing”
display.
PRESSURE CAL
ECV MANOMETER
A/D XXXX
daPa -200
3.2
At this point connect the probe tip to a manometer.
NOTE: Manometer internal volume must be less than 5 cc’s.
Press the Key. At this point the pump will pressurize to -200 daPa
Use the Keys to adjust the pressure on the external manometer
to -200
Press the Key to store the -200 daPa Calibration data. The messages
saved will appear in the lower right hand corner of the display. After 3 to 5
seconds the saved indicator will be extinguished and the display will update to
a steady state display as follows.
At this point verify that the leak rate is less than 2 daPa/sec:
Press the Key and the 38 will pressurize to +200 daPa. V e r
manometer reading is within of the pressure value indicated on the 38
display.
Pres he Key to return to the Main Calibration Mode Menu.