Bacharach Gas Pup Instrukcje Operacyjne Pobierz pdf (Strona 12)

CONSTRUCTION GA-40 T plus

G the gas sensors are working even when the analyser is switched off - so the battery should never be

disconnected or completely discharged.

G the analyser should not be switched off before all the flue gases have been removed from the

analyser gas circuit.

G the sensor chamber must be kept dry.

G the switched off analyser should be kept in a cool place, which increases the lifetime of the gas

sensors.

Gas Cell type Range [ppm]

O2 2FO 0 - 20.9 %

CO A3E/D 0 - 4000

CO 3F/D 0 - 20 000

CO 3M/F 0 - 10 %

NO 3NF/F 0 - 5 000

NO2 3ND 0 - 1000

SO2 3SF 0 - 5000

H2S 3H 0 - 1000

H2 3HYT 0 - 2000

HxCy PELLISTOR 0 - 3 %

CO2 IR 0 - 50 %

Tab. 1 Available measuring cells and ranges

4.2.2 Ambient air temperature sensor

The ambient temperature is measured by the analyser for use in some of the calculations carried out, such as

Stack Loss. This can be carried out either by the temperature compensation sensor built into the plug of the

probe holder (INT) or the external connector T3 (EXT). The temperature sensor is chosen under the suboption

OPTIONS / SENSORS / ANALOGUE INPUTS.

4.2.3 Flue gas temperature sensor

Flue gas temperature sensor is situated in the gas probe pipe and plugged into PROBE socket on the front

panel of the analyser. This sensor is a NiCr-Ni thermocouple in the standard probe version. The range of such

a thermocouple is 50-800

C 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 1600

C. 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 Differential pressure sensor

The GA-40 T plusplus is fitted with a precise semiconductor differential pressure sensor. Stubs marked +/-

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 +/-50 hPa. This sensor can also be

used for measurement of the flow rate in the stack.

4.2.6 Analogue inputs

The six analogue inputs installed can be used to measure voltage or current on two channels (U/I1 and U/I2),

temperature using thermocouples (T1 EXT and T2 EXT) and temperature using thermistors (T3 EXT and T4

EXT). The values measured can be viewed on the screen or stored in the EEPROM memory.

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