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WARNING
Some sensors (for example NH3, H2, H2S, SO2,...) are sensible to other gases called
interfering gases.
On the analysis phase, the influence of interfering gases is compensated only if on
the instrument are installed the correspondent sensors.
If a sensor sensitive to NO and NO2 interfering gases is installed on the instrument,
but only the NO sensor is installed in the instrument, NO2 gas compensation is
carried out starting from the NOx/NO ratio.
4.3 CO dilution
One of the characteristics of the electrochemical sensor for the measurement of CO is the need to require very
long self-calibration time in case it has been in contact with high gas concentration (greater than the full scale) for
a long time.
The CO sensor is therefore protected in this instrument by an automatic dilution system that allows to extend the
measuring range of the sensor without overloading the sensor itself.
The dilution system allows to have the CO sensor efficient any time and ready to perform properly even in case
of very high concentration of CO.
The dilution system also allows to extend the measurement range of the CO sensor as follows:
- up to 100,000 ppm for a CO sensor with 8000 ppm full scale
- up to 250,000 ppm for a CO sensor with 20,000 ppm full scale
In this way in addition to better manage the wearing of the sensor, it is also possible to continue sampling,
without any work interruption.
4.4 Fuel types
The device is provided with the technical data of the most common types of fuels stored in its memory. By using
the PC configuration program, available as an option, it is possible to add fuels and their coefficients in order to
define up to a maximum of 32 combustibles, other than the default ones.
For more details
see Annex
4.5 Pressure sensor, piezoelectric, temperature compensated
The instrument is internally provided with a piezoresistive differential pressure sensor, temperature compensated,
for measuring pressure or draft.
This sensor is differential type thus, thanks to the second measurement port, can be used for measuring the draft
(negative pressure) in the chimney, for the leak test of the pipes, for differential pressure measurement, for
measuring the velocity of the flue gas using a Pitot tube, for flow measurement, and possibly for other
measurements (pressure of gas in the piping, pressure loss across a filter, etc.).
The measurement range is -10,00 hPa .. +200,00 hPa.
Any potential drift of the sensor are nulled thanks to the autozeroing system which in this instrument can NOT be
operated with the flue gas probe inserted in the chimney.
WARNING
ANY PRESSURE APPLIED TO THE SENSOR GREATER THAN ±300 hPa MAY CAUSE A
PERMANENT DEFORMATION OF THE MEMBRANE, THUS DAMAGING IRREVERSIBLY
THE SENSOR ITSELF.
4.6 Gas extraction pump
The sample pump located inside the instrument is a DC-motor-driven diaphragm pump, powered by the
instrument, and is such as to obtain optimal flow of the sampled gas being analyzed; an internal sensor that
measures the flow allows to:
- Keep the flow rate of the pump constant
- Check the efficiency of the pump
- Check the degree of clogging of the filters
4.7 Simultaneous measurement of pressures, O
The instrument, to obtain boiler's perfect combustion parameters, allows to measure simultaneously the input and
output pressure of the gas valve, the level of O2, the levels of pollutants and all the calculated parameters
needed to obtain the correct value of yield.
See section 10.1.3.
4.8 Smoke measurements
It is possible to enter the smoke values measured according to the Bacharach scale. The instrument will calculate
the average and print the results in the analysis report.
An external pump, available as an option, must be used to perform this measurement.
C.
, pollutants
2
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K400000000SE 041891 010823
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