Section 6
6-14
Interfacing
The calibration equation is of the form Y = A + BX + CX
2
, where A, B, and
C are FCTs 71, 72, and 75, and X is the actual mV output of the sensor. See
Section 5.3, FCT 70.
6.5 Temperature Output
The analyzer temperature can be recorded by connecting a logging device to
the terminal strip on the analyzer back panel. Connect the positive lead from
the data logger to the terminal labeled
TEMP 5V
, and the negative lead to the
terminal labeled
SIG GND
(Fig. 6-5).
Temperature output is linear, and can be computed according to
T C
C
V
°
( )
=
°
50
4096 mV
where V = the analyzer output in millivolts, and 0V = 0
°
C.
DAC1 5V
DAC1 100mV
DAC1 20mA
DAC2 5V
DAC2 100mV
DAC2 20mA
SIG GND
SIG GND
CO
2
0.1S
CO
2
1S
H
2
O 0.1S
H
2
O 1S
SIG GND
TEMP 5V
AUX
CHASSIS GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
DATA LOGGER
Figure 6-5. Connection of data logger for analyzer temperature output.
