uniphy Phyaction V, Service Manual

Page: 7 / 18

Service manual Phyaction V
Service manual version 0.1 Page 7
5.3.3 End of Treatment
Prolonged exposure to the vacuum under the suction cups can lead to injuries, e.g. when the
patient is forgotten by the operator (actually has happened!). To prevent this, the unit senses
the patient current in both channels when the vacuum is turned up. To keep the patient circuits
floating this is done by optocouplers blocking a timer from running while the vacuum is switched
on. As soon as no current is flowing in both channels, this timer will start running and, on timing
out after a couple of minutes, switch off the vacuum. The yellow output indicator light(s) next to
the vacuum connectors will now flash until the vacuum control knob is turned back to zero.
5.3.4 Water management
Because the sponges in the vacuum cups must be moistened for conductivity, unavoidably
droplets are sucked into the system. These droplets do not only contain water but also fibers
from the sponges, flakes of skin and other substances present under the cups. To prevent
these to reach the pump and pollute it, the air crosses a water container first where the not
gaseous particles are percipitating. The now clean air is prcocessed by the pump and released
into the ambient through a silencer. After a while this container will get filled with water and if not
emptied, water would reach the pump and be sprayed out through the silencer. To prevent this
happening there is a level detector inside the water container. When too high a level is
detected, this is shown to the operator by a blinking light next to the ‘water container full’ symbol
on the front. A running session will not be ended by this situation but when trying to turn up the
vacuum from zero for a new treatment, nothing will happen. The operator first has to empty the
water conainer by detaching the hose at the rear side of the unit and letting out the water.