Huntleigh Flowtron AC550, Service Manual

Page: 27 / 42

1. With the pump switched Off and disconnected from the power supply,
remove the top cover as detailed in Section 4.1.1
2. Carefully disconnect the two tubes attached to the pressure transducer
and attach a suitable piece of spare tubing to one of the ports of the
transducer, leaving both the other end of the tube and the other
transducer port disconnected.
3. Attach a shorting link across connector CON 3.
4. Reconnect the plug into the supply outlet and switch the pump on. The
pump should beep and, following its initial test sequence, will display
‘
CO
‘ and beep continuously.
5. Remove the shorting link from connector CON 3.
6. Press the Single Leg button, ensuring that the unit beeps and the
display changes to ‘
AO’
. Wait for approximately 5 seconds. If the
display has changed to ‘
C7
‘, proceed to the next step. If, however,
after the 5 second period the display still shows ‘
AO’
, a small
adjustment to the ZERO trimmer potentiometer is required. This
adjustment could be in either direction and should be made gradually
until the pump beeps and the display changes to
‘C7’
.
7. Apply 70 mmHg to the tubing added earlier and press the Single Leg
button ensuring the pump beeps and the display changes to show
‘AS’
.
Again, wait for approximatley 5 seconds to see if the display changes
to
‘CO’
; if so, proceed to the next step. If, however, after the 5 second
period the display still shows ‘
AS
‘, a small adjustment to the GAIN
trimmer potentiometer is required. Again, this adjustment could be in
either direction and should be made gradually until the pump beeps and
the display changes to show
‘CO’
.
8. With the pump displaying ‘
CO
‘, remove the air source from the tubing
and ensure that the transducer tubing is open to atmosphere. Press the
Single Leg button ensuring the pump beeps and display changes to
‘AO’
. Again, wait for approximately 5 seconds to see if the display
changes to
‘C7’
; if so, proceed to the next step. If, however, after the
5 second period the display still shows
‘AO’
, a further small adjustment
to the ZERO trimmer potentiometer is required. Again, this adjustment
could be in either direction and should be made gradually until the
pump beeps and the display changes to show
‘C7’
once again.
247901 4-5 Issue 1
March 1998
WARNING :
DURING CALIBRATION AC POWER VOLTAGES ARE PRESENT