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12.0 READINGS
12.1 READINGS
PARAMETER DESCRIPTION
The DRAFT menu gives access to the stack draft measurement. Being a negative pressure, in
accordance with standard UNI10845, draft must be measured using the negative pressure input
P-. The correct values for a natural draft boiler are therefore positive by definition. Before
performing the measurement the instrument allows the user to input the external air temperature
as required by the standard. Afterwards the user can acquire the value displayed in order to add
it to the running analysis measurements or, alternatively, print the relevant ticket through the
‘PRINT’ menu.
NOTE: The measurement may not be accurate due to condensation inside the gas probe.
Should you notice an inaccurate or unstable reading on the instrument, it is advisable to
disconnect the gas probe from the instrument itself, and purge pipes by blowing with a
compressor. In order to be sure there is no humidity, it is suggested to perform the
measurement by means of the transparent rubber pipe supplied on issue.
SEE SECTION 12.2.
It is possible to enter the data concerning one to three SMOKE TEST measurements taken by
means of an optional device (MANUAL SMOKE PUMP); see the relevant instructions.
The method consists in taking a certain quantity of combustion gas from the middle of the flue
behind the surfaces of the exchangers at the end of the boiler, and make it pass through a
special filter paper. The soot stain obtained is compared with the surfaces blackened in a
different way according to a comparison scale; it is thus determined the "soot number", which
will be entered in the instrument manually.
These measurements can be either stored in memory together with the combustion analysis
data or printed on a ticket.
SEE SECTION 12.3.
This type of analysis lets the user measure the CO value present in the environment, with the
scope of checking the personal safety conditions of a specific working environment. The
instrument leaves our factory with the following preset threshold values:
COmax: 35 ppm Recommended exposure limit (REL) stipulated by the National Institute for
Occupational Safety and Health (NIOSH), equivalent to 40 mg/m
3
and calculated as
an 8-hour Time-Weighted Average (TWA).
It is compulsory to perform the autozero in the clean air, so that the ambient
CO measurement is correct. It is advisable to turn on the instrument and
wait for the autozero completion outside the area where the test is being
performed.
SEE SECTION 12.4.
07/08/14
10:00
Draft
Ambient CO
Pressure
Smoke
Temperature
Tightness test
Measurements
External probe
KEY FUNCTION
Activate the context keys shown on the
display.
Returns to the previous screen.
CONTEXT KEY FUNCTION
Selects the available parameters.
Enters in the selected parameter setting.
Selects the available parameters.
OK
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Draft
Smoke
Ambient CO
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