52
User Manual
"Steam sterilizer Laboklav 55 - 195
"
11. Description of Safety devices
The steam sterilizer is equipped with different safety devices. The safety devices protect the user
against injury and safe the sterilization process. Mechanical and electronic safety devices are built in
and realize in sum a safety concept with different safety functions.
- Protection against over pressure
– If control board is measuring a chamber pressure of more
that 345 kPa absolute pressure (2,45 bar relative pressure) an alarm is generated (including error
message) and the heating function is switched of. The heating function can be switched on
manually again by pressing Escape button. So the program is not broken. With 360 kPa absolute
pressure another error message is generated that is breaking the program automatically. With 2.8
bar relative pressure the safety valve is opening and chamber pressure is reduced mechanically!
The steam is blowing into the housing contact with the steam is not very dangerous because it is
saturated after blowing out.
Attention
: To check the safety valve a special program can be implemented that is bridging the
safety functions of over pressure protection. This program will be implemented on special order
by the customer only! Blowing off the safety valve in the condition that the housing I not opened
can damage the electric board!
-
Protection against opening the chamber while over pressure is inside
– the device has a
built in thermo locking function. The device opens the thermo lock when pressure is low only. The
pressure is checked by pressure sensor and an additional pressure switch that detects normal
pressure. The opening mechanism is calculated to open when chamber pressure is low. These 3
safety functions give good protection against opening while pressure in chamber is high.
-
Protection against opening the chamber while Temperature of liquids is too high
– One part
of the thermo locking system is the measurement of the temperature inside liquids by the
reference sensor. The device is unlocking the lid in liquid programs when temperature is lower
than programmed removing temperature is reached only. The flask where the reference sensor is
positioned should be from the same size, form and filled with same volume of the largest single
volume of the sterilization goods.
-
Protection against steam out coming from chamber
– steam production is switched off
immediately if the lid is opened. After program finish the preheating of steam generator is
switched off so steam out coming from steam inlet should be not possible. Preheating is switched
on again after new program change or entering the same program again.
-
Protection against over heating the steam generator
– the steam generator is protected
against over heating by 2 independent over temperature switches. One of them is self resetting
when temperature is low again, the second one needs to be reset manually by authorized service
stuff. Over heating protection switches break the program.
-
Protection against over heating the chamber
– The chamber is not directly heated so it can
reach maximum the steam temperature that is limited by the pressure.
The safety devices are to be carried out once a year by an
authorized service technician, who is considered a qualified
person.
