SECTION 9: CALIBRATION PROCEDURES
Part No. 715-0080, Rev. B
- 74 -
11.
Reconnect the incubator to an appropriate source of AC power and turn the unit on. Adjust the
setpoint temperature to 37.0
C. Operate the unit until the temperature inside the infant
chamber stabilizes (approximately 30 minutes).
12.
If the temperature indicated by the monitoring instrument is not 37.0
0.5
C, adjust
R3
on the
control board until 37.0
C is achieved. This adjusts for the temperature offset between 10 cm
above the center of the mattress and the location of the control temperature sensor.
13.
Wait 10 minutes and repeat the previous step if necessary.
14. Adjust
R9
until the incubator displayed temperature matches the measured temperature of the
measuring device,
0.5
C. Operate the incubator long enough to allow the displayed
temperature to stabilize and adjust
R9
again as needed.
15.
Wait 10 minutes and repeat the previous step, if necessary.
16.
Use the two black clip leads to connect the 10 k
resistor between
TP1
and
TP2
on the display
board, while the setpoint temperature is set at 37.0
C. (This effectively sets the temperature to
39.9
C). Verify that the
HIGH TEMP
alarm activates at 38.5
0.1
C as indicated by the front
panel display. The alarm should sound at approximately 8 second intervals. Adjust
R8
on the
control board as necessary.
17.
As the temperature in the chamber continues to rise, verify that the
SYS FAIL
alarm activates at
39.0
0.2
C and that the heater is disabled (incubator cools gradually). Adjust
R7
on the
control board as necessary. If this adjustment seems to have no effect, check that the
secondary
SYS FAIL
isn’t activating at too low a temperature (see step 18).
18.
With the other black clip lead, ground
TP7
on the control board by clipping on to the chassis.
The
SYS FAIL
alarm should turn off. Verify the
SYS FAIL
alarm reactivates at 39.2
0.1
C,
and that the heater is again disabled. Adjust
R15
on the control board as necessary. This
SYS
FAIL
alarm should continue to be active even though the incubator cools below 39.2
C - the
incubator must be turned off, then back on, to cancel it.
19.
Remove all clip leads. Allow time for the unit to re-establish equilibrium.
20.
Disconnect the power cord. The
BAT OP
indicator should illuminate. The
MUTE
button will
cancel the
AC FAIL
alarm. Operate the unit from battery power for five minutes and verify that
the temperature maintained is the same as with AC operation.
Summary of Contents for AirBORNE A750i
Page 1: ...A750i Transport Incubator Service Manual...
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Page 9: ...Par rt No 715 008 80 Rev B LA ANGUAG GE DIS 7 SCLAIM MER...
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