98
K600000000SE 030804 011018
13.0 MEASUREMENTS
13.1 MEASUREMENTS
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. When making the measurement and the temperature has been
inserted, the instrument provides a stack draft value related (P diff ref) to the external
temperature of 20° C as requested by law. When the inserted external temperature is higher
than 20° C the instrument reports a stack draft value reference equal to the measured draft.
Afterwards the user can acquire the value displayed in order to add it to the running analysis
measurements or, alternatively, print the relevant paper print-out 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 13.2.
It is possible to enter the data concerning one to three SMOKE measurements taken by means
of an optional device (Smoke Pump Kit); 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 smoke stain obtained is compared with the surfaces blackened in a
different way according to a comparison scale; it is thus determined the "smoke number", which
will be entered in the instrument by hand.
These measurements can be either stored in memory together with the combustion analysis
data or printed on a paper print-out.
SEE SECTION 13.3.
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 pre-set 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).
Make sure to perform the autozero in a clean environment (preferably
outdoors), 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 13.4.
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
◄
►
Draft
Smoke
Ambient CO
15/01/14
10:00
Draft
Ambient CO
Pressure
Smoke
Temperature
Tightness test
Measurements
Leak detector Aux Meas.
To Next Page
Loading...
