Gambro AK 98 Service Manual

HCEN12630 Revision 07.2015
Program version 1.xx
AK 98™ Dialysis Machine - Technical description 75
Figure 3-16. Degassing chamber.
1. Air outlet
2. O-ring
3. RIVA
4. In
5. Out
The seal in the top consists of a very small o-ring. It is placed in a plastic fixture which
is screwed onto the top of the chamber. If it is missing, misaligned or damaged not
only gas but also fluid will escape through the top. This will lead to reduced flow
through channel 1 in the flow transducer – the UF cell.
The result of this will be pump speed alarms or attentions (“INCORRECT
CONCENTRATE”). The reason is that the conductivity control is based upon the
assumption that the flow through the conductivity cells is the same as the flow in
channel 1. A leakage in the top of the degassing chamber will therefore lead to
decreased pump speeds and the corresponding attentions. Or if it is big 0505 006 003.
3.3.3.5.2 Preset of the degassing pressure
The Flow Pump generates the negative degassing pressure by pulling the fluid through
the degassing restrictor.
The default preset value is -610 mmHg, but can be preset to other values (-300 to -700
mmHg in 5 mmHg steps) in case the AK 98 dialysis machine is operated at other
altitudes than sea level.
Relation between pressure and altitude:
P
degass
= - ((760/e
h/7338
) - 150) (mmHg).
Degassing pressure (P
degass
) as function of altitude (h):

Gambro AK 98 Specifications

General

Brand	Gambro
Model	AK 98
Category	Medical Equipment
Language	English