8
DOC in the analyte.
The analyzer features a temperature sensor (platinum thermal resistor) to
measure temperature and to automatically compensate for the temperature de-
pendence of the oxygen sensor signal. The temperature sensor signal is supplied
to the ADC input.
The ADC converts signals of the oxygen sensor and the temperature sensor
into codes incoming the microcontroller.
The microcontroller processes the codes received and shows the information
on the digital LCD display.
1.5.3 Analyzer design
The analyzer is shown in Fig.1.1
а
.
Converter unit 1 has a sealed plastic housing and is designed to convert sig-
nals from oxygen sensor 2 and display measurement data.
The front panel of the converter unit features:
indicator screen 3 designed to display a measured DOC value or temper-
ature (depending on the chosen measuring mode), battery charge and current time
(in off state);
button 4.
The back panel of the converter unit features a battery compartment cover.
Located on top of the converter unit is sealed cable entry 5 for oxygen sen-
sor 2.
а
b
Fig. 1.1
1
3
15
2
4
5
12
11
13
14
8
9
10
7
16
6
17
MODE
CAL
ENTER