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STAT
IM 2000/2000S
Service Guide
96-106775 Rev 5.0
5. STAT
IM 5000S Calibration
STAT
IM
5000/5000S/5000 G4 Service Guide
6. Allow the chamber to reach the sterilization temperature. As pressure builds in the
chamber check for leaks in the cassette, associated piping and fittings. A steam leak in
the system will introduce errors in the measurement and will result in improper calibration
and potentially non-sterile instruments.
7.
IMPoRTANT NoTe: For units fitted with a Stainless Steel steam generator (revision
4.xx software)
, at the beginning of the holding phase (sterilization phase) all the devices
are turned off for approximately 10 seconds to facilitate the calibration process. This will
happen ten times in succession. During these periods chamber temperature could go
down to 131°C which is quite normal. After these ten “calm” periods the unit will resume
normal operation.
This DoeS NoT happen on units fitted with aluminium external (AleX)
steam generator (revision 5.xx software).
TIP
: To check that the calibration has been done correctly on Stainless Steel/Rev 4.xx units,
look at the external temperature reference meter. When it shows 136.5°C you should hear
the solenoid valve ‘click’. (In this type of unit the software is set to open the solenoid valve at
136.5°C)
8. When
Adjust Temp!
appears on the display, (see below) and you are confident that the
readings are stable, the chamber thermocouple offset CO can now be adjusted using the
TC-ADJ potentiometer until the reading on the LCD display (as displayed in the CCC.C
field) matches the external temperature reference meter’s reading. The CO field will then
show the new chamber temperature offset.
IMPoRTANT NoTe:
When the initial pressure and temperature readings have been adjusted,
and to ensure equilibrium of the calibration, compare the measured chamber pressure (PPP.P)
and the calculated chamber pressure (TTT.T) displayed on the LCD. They should be within 1
kPa of each other during equilibrium.
9. If they are not, then the unit may be fine tuned as follows:
• These units have a two stage pressure offset and the upper offset can be modified
during the sterilization phase of the calibration. This will NOT effect the lower offset
value BUT if you subsequently change the lower value after the unit has vented then
you will lose the upper value as this will be reset to the same value as the lower offset.
• If the actual chamber pressure reading on the LCD (PPP.P) is different by more than
1 kPa from the pressure reference meter reading then this can be adjusted using the
wrapped and unwrapped keys.
• If this adjustment corrects the PPP.P reading to within 1 kPa of the TTT.T reading then
the unit is now in equilibrium.
• If these readings are still not within 1 kPa of each other then further adjustment may
be undertaken as follows:
• The theoretical pressure reading (TTT.T) and actual chamber temperature reading
(CCC.C) are directly related and when the actual temperature value is increased
or decreased, the theoretical pressure value will also increase or decrease
respectively.
• Adjust the theoretical chamber pressure (TTT.T) using the TC-ADJ potentiometer
(remember that the theoretical pressure is related to the ACTUAL temperature
which is adjusted using the TC-ADJ potentiometer) until PPP.P and TTT.T are
within 1 kPa of each other.
PPP.P PO TTT.T
CO
CCC.C
Adjust TEMP!
