Graseby 3000/500, Manual

Page: 128 / 231

G r a s e b y M e d i c a l L t d .
7 — 3 2
I s s u e A ( A p r i l 2 0 0 2 )
3 0 0 0 / 3 1 0 0 a n d 5 0 0 / 5 0 5 S e r v i c e M a n u a l
V o l u m e t r i c I n f u s i o n P u m p s
7
Adjustment of the ‘Cassette Fitted’ micro switch (located on the ‘Pressure
plate assembly’)
The adjustment of this micro switch is necessary if the unit fails
function test no.8 page 7-11, or if fitting a new pressure plate
assembly to the unit.
To carry out the adjustment procedure the pump must be in the
diagnostic mode. To do this, switch the pump OFF and ensure the
pump is on AC power.
Press the OPTIONS key and the ON/OFF key simultaneously.
Enter the ID 3031, then PASSWORD 7867.
Using the OPTIONS key scroll to the Pressure Calibration screen.
On the pressure plate carefully peel back the black urethane overlay
that protects the pressure transducer and the micro switch from fluid
ingress. Peel the overlay down from the top right hand corner to
expose the white round switch actuator.
Place the 0.89mm allen key in the grub screw in the centre of the
actuator and carefully place a small flat blade screwdriver, such as a
2.0 mm precision screwdriver, in the appropriate slot on the edge of
the actuator.
Holding the actuator in one place using the screwdriver will allow
you to adjust the actuator in or out as necessary by adjusting the grub
screw clockwise or anticlockwise.
If the unit displays a ‘0’ on the right-hand side of the display with the
0.015” gauge fitted then adjust the grub screw clockwise.
If the unit displays a ‘1’ on the right-hand side of the display with the
0.012” gauge fitted then adjust the grub screw anticlockwise.
Reposition the urethane overlay or if it has become damaged during
the process then replace as necessary.
Unit should display a ‘1’ with the 15” gauge fitted.
Unit should display a ‘0’ with the 12” gauge fitted.