Instruction Manual
748441-D
April 2002
Rosemount Analytical Inc. A Division of Emerson Process Management
Maintenance and Service 5-21
Model CAT100
1. Switch on the analyzer.
2. Admit zero gas to the analyzer.
3. Connect the DVM to the following
measuring points:
X 25 and X 28 for channel 1 (infrared
measurement only).
X 27 and X 28 for channel 1 (com-
bined oxygen / infrared measure-
ment)
X 27 and X 28 for channel 2 (IR
measurement only).
Standard Photometer (not sealed ver-
sion):
1. Slightly loosen the light source mount-
ing screws (Figure 5-13, page 5-19,
item 5) or the temperature sensor
(Figure 5-13, item 3) respectively for
channel 1 or channel 2.
2. Set the zero level precisely to 0 V (
±
100 mV) by turning the corresponding
light source. If the turning of the light
source is not sufficient, the zero point
can be adjusted by sliding the zero-
level adjustment baffle (Figure 5-13,
page 5-19, item 4).
3. Tighten the light source mounting
screws (Figure 5-13, item 5) or the
temperature sensor (Figure 5-13, item
3) respectively for channel 1 or chan-
nel 2.
4. When the physical zeroing has been
correctly set, perform an electrical ze-
roing as described in Section 3-4a,
page 3-12.
Sealed Photometer Option:
1. Slightly loosen the light source
mounting screws (Figure 5-13, page
5-19, item 5) or the temperature sen-
sor (Figure 5-13, item 3) respectively
for channel 1 or channel 2.
2. Set the zero-level to precisely 0 V (
±
100 mV) by turning the correspond-
ing light source.
3. For photometer with pyroelectrical
detector only:
a. To facilitate the physical zero-
level adjustment, there is built
into the light source, one of
three different tight baffles
(zero-level adjustment baffles).
For simplicity of exchange, the
baffle is held into the light
source by a magnet. If the turn-
ing of the light source is not suf-
ficient, another tight baffle can
be used to position the light
source.
4. Tighten the light source mounting
screws (Figure 5-13, page 5-19,
item 5) or the temperature sensor
(Figure 5-13, item 3) respectively for
channel 1 or channel 2.
5. When the physical zeroing has been
correctly set, perform an electrical
zeroing as described in Section 3-4a
page 3-12.
j. Replacement
of
Electrochemical
Oxy-
gen Sensor
Because of the measuring principle util-
ized in the electrochemical oxygen sen-
sor, the sensor will have a limited life
time.
The life time of the oxygen sensor is de-
pendent on the sensor itself and on the
measured oxygen concentration and is
calculated as follows:
Sensor time (hours)
Life time =
O
2
concentration (%)
The sensor time (operation without oxy-
gen at 20
°
C) is:
•
About 900,000 hours for a sensor with
a response time of about 12 s
