Page 112
STAT
IM 2000/2000S
Service Guide
96-106775 Rev 5.0
5. STAT
IM 5000S Calibration
1. Chamber Thermocouple and Pressure Transducer Calibration
To calibrate the chamber thermocouple and pressure transducer:
9. To start the calibration cycle,
press and release
the UNWRAPPED cycle button on the
control box / display and then press the
START
button.
Adjust Press!
will appear in the
display and the PO value will flash. The PO value can only be adjusted while it is flashing.
10. By using the Unwrapped key (+) and Wrapped Key (-) the pressure offset PO (at
atmospheric pressure) can now be adjusted until the reading on the LCD display (as
displayed in the PPP.P field) matches the external pressure reference meter’s reading.
The PO field will then show the new pressure offset.
NoTe
: This has to be done within
30 seconds.
11. After 30 seconds, the calibration cycle will continue by entering the heating up phase
and the Po will SToP flashing and the Co value will flash
. The CO value can
only
be
adjusted while it is flashing.
12. During calibration the unit will run a normal cycle.
13. 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 may compromise sterilization conditions.
14. 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
wrapped and unwrapped keys 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.
15. 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.
• Press the Rubber and Plastics key.
•
The Co value will now SToP flashing and the Po value will now flash.
• Use the wrapped and unwrapped keys to correct the upper PO value.
• If this adjustment corrects the PPP.P reading to within 1 kPa of the TTT.T reading then
the unit is now in equilibrium.
PPP.P PO TTT.T
CO
CCC.C
Adjust Press!
PPP.P PO TTT.T
CO
CCC.C
Adjust TEMP!
STAT
IM
5000/5000S/5000 G4 Service Guide
