Instruction Manual
748441-D
April 2002
Rosemount Analytical Inc. A Division of Emerson Process Management Operation 3-19
Model CAT100
3-10 TEMPERATURE STABILIZATION (OP-
TION)
Higher accuracy of concentration meas-
urement as a function of temperature for
the CAT 100 is achieved through the im-
plementation of a controlled heater tem-
perature within the enclosure. The
temperature controller is mounted to the top
of the analyzer and can be seen through
the window.
The internal temperature of the analyzer is
factory set to 50
°
C. This internal tempera-
ture is suitable for ambient temperatures of
up to 45
°
C (50
°
C max.).
For higher or lower expected ambient tem-
peratures, the internal analyzer tempera-
ture can be set to the highest expected
value but not above 50
°
C. For instance, if
the ambient temperature is not expected to
exceed 30
°
C, the temperature controller
can be set to 30
°
C, resulting in longer life
for the heaters and temperature controller.
NOTE
If the temperature is changed from the
factory setting of 50
°
C, then the ana-
lyzer must be re-calibrated at the newly
set temperature. See Sections 3-4 (page
3-12), 3-5 (page 3-13) or 3-6 (page 3-15)
for calibration procedures.
NOTE
When equipped with this temperature
stabilization option, allow the analyzer
to reach operating temperature before
making valid gas concentration meas-
urements. The ramp rate of the tempera-
ture controller is 20
°
C/hr so adjust
warm up time according to the ambient
temperature and the controller set point.
a.
Changing Temperature Settings
To change the internal temperature set-
ting, remove the dome housing and ad-
just the set point to the desired value as
described below.
Figure 3-8. Temperature Controller
1. Press MENU once. The display will
flash the first digit of the set point.
2. Press MAX to set the digit from 0 to
9.
3. Press MIN to activate the next digit.
4. Repeat these steps to set the other
digits.
5. Press ENTER to store the setting
and return to run mode.
SP2
AL1
AL2
°
C
°
F
SV
MENU
/ MAX
/ MIN ENTER
