www.madur.com
Manual
GA-21Plus
4.2.2. Ambient temperature sensor
The ambient temperature is measured by the analyser for use in some of the cal-
culations carried out, such as Stack Loss. This can be carried out either by the temperat -
ure compensation sensor built into the plug of the probe holder (INT) or the external con -
nector T3 (EXT). The temperature sensor is chosen under the suboption:
OPTIONS → SENSORS → ANALOGUE INPUTS
.
4.2.3. Fleue gas temperature sensor
The flue gas temperature sensor is situated in the gas probe pipe and plugged
into the
PROBE
socket on the front panel of the analyser. This sensor is a NiCr-Ni ther-
mocouple in the standard probe version. The range of such a thermocouple is 50-800oC
in the standard version (1100°C available optionally). A special gas probe with PtRh-Pt
thermocouple can also be used, with a range up to 1600oC. Proper flue gas temperature
measurement is the most important factor for correct calculation of the chimney loss and
other heat engineering results.
4.2.4. Gas chamber temperature sensor
To compensate for temperature drift of the gas cells, the temperature of the gas
chamber is constantly monitored.
4.2.5. Differentia pressure sensor
The
GA-21
plus
is fitted with a precise semiconductor differential pressure
sensor. Stubs /- PRESSURE situated on the left side of the front panel are used
to measure pressure. Negative pressure in flue gas channel (chimney draught) can be
measured with the one stub only; differential pressure measurement is possible using
both stubs. The measuring range of the pressure sensor is +/- 25 hPa.
4.2.6. Analogue inputs
The three analogue inputs installed can be used to measure voltage or current on
two channels (U and I), temperature using a thermocouple (T1 EXT) and temperature us-
ing a thermistor (T3 EXT). The values measured can be viewed on the screen or stored in
the EEPROM memory.
12
