Cardinal Health IVAC 571, Technical & Service Manual

Page: 30 / 104

IVAC® Volumetric Pump (Models 571 & 572) 30/104 1000SM00018 Issue 2
Routine Maintenance
Mechanism Leak Test
Procedure:
1. Prepare a special Pressure Test Set as follows:

Take an IV infusion set and cut the tubing a couple of inches
below the drip chamber, discarding the drip chamber.

With a knife, carefully remove the membrane cover from the
white pressure sensing disc, see Figure 3-2. Ensure no membrane
(rough edges) remain—the surface of the pressure sensing disc
should be as flat as possible after the membrane is removed.

Cut out a piece of mylar to match the shape and size shown
below.
Remove the adhesive backing and firmly press the mylar onto the
surface of the pressure sensing disc so that it covers the vertical
slot and is centered on the disc. See Figure 3-3

The distal end (bottom) end of the set may be cut to adapt it for
connecting to the air pressure source.
When servicing the pump, the Mechanism Leak Test must be performed to verify the integrity of
the pumping mechanism.
Misalignment of the pumping mechanism can result in the pressure plate and the mechanism's cam
followers failing to pinch the IV infusion set tubing sufficiently, thereby allowing the pump to leak
fluid at low rates or when stopped.
2. Load the special pressure test set, with 15.0 psi (775 mmHg) air pressure at the distal end, into the pump and close the
door.
3. Run the top end of the pressure test set into the water bottle and below the water level (as shown below).
4. Open the pressure test roller clamp to pressurise the set.
Change the special Pressure Test Set after 20 uses, or if signs of wear are visible on the silicone
section or if any leak in the set is observed.
Reservoir
Pressure
Gauge
Air
Pressure Source
Water Bottle
Roller Clamp
Mylar Cap
Shape
Cut away
membrane cover
Firmly press
mylar cap
over slot
Figure 3-2
Figure 3-3