Tuttnauer 6671130, Operation & Maintenance Manual

Page: 108 / 143

MAN205-0195042EN Rev. A Aug. 2011
Page 102 of 137 pages
9.10 Calibration
The programming of the calibration procedure is almost identical
for both temperature
and pressure. Calibration is performed digitally.
The temperature and pressure measuring circuits are designed with components having
a 1% precision. The temperature circuit is linear and has an output of 100mV-2400mV
for a temperature range of 20
º
C-150
º
C (68
º
F-302
º
F).
The pressure circuit is also linear and has an output of 100mV-2400mV for a pressure
range of 0-400 kPa. (0 -58 psi).
The measuring at the A/D is void for values higher than 2400mV or lower than 100mV.
Even though the precision of the components of the circuit is 1%, the acceptable
deviation can reach

5%, therefore calibration is necessary.
The system has a non-erasable memory in which the OFFSET and GAIN data of the
sensors are stored. This data may be inserted into the system, through either
programming or directly through the autoclave.
The calibration method enables the insertion of this data into the system in order to
perform the automatic correction of the OFFSET and GAIN.
Before calibrating it is recommended to find two points that have to be inserted into the
system (temperature or pressure).
a
X
Y
INPUT FROM SENSOR
P
R
E
S
U
R
E
V
1
313
V
2
133
READ
ACTUAL