Eurotron EcoLine 2000, Инструкция по эксплуатации

Страница: 16 / 59

Instruction Manual MM850404 ed.05
16
3.2 Auxiliary Measurements
3.2.1 Temperature Measurements
The instrument is equipped with two temperature inputs to measure exhaust gas and the burner air input temperatures
(combustion gas).
♦
A thermocouple type K (nickel-nickel chromium) is included in the tip of the gas sampling probe to measure the flue
gas/exhaust gas temperature . This thermocouple is suitable for permanent measurements at temperatures up to
800°C and for short-term measurements up to same time and location. Temperature measurement and gas
sampling from the flue gas pathway are thus always performed at the same site. The probe is connected to the unit
with compensated cable and connector. An internal Pt100 resistance thermometer is used for cold junction
compensation.
♦
A remote Pt100 sensor, can be supplied on request with a 2 meter cable to measure the air inlet temperature in
forced air boiler. This option is very important for an accurate efficiency calculation.
3.2.2 Pressure and Draft
The analyzer is equipped with a temperature compensated pressure sensor to measure the stack draft or pressure. The
pressure/draught sensor is based on the principle of the extension metric measuring bridge. The pressure range is -10 to
100mbar. The sensor is factory calibrated and does not require manual adjustment.
The zero drift, caused by ambient air temperature variation, is automatically cancelled at each instrument start-up. In
addition, for more accurate readings the operator can reset, using the pertinent key, the zero if required. Leave open the
“
Δ
P” connector during this phase.
N
OTE
: F
OR HIGHER ACCURACY
,
WE SUGGEST TO EXECUTE THE AUTOZERO PROCEDURE BEFORE PERFORMING THE MEASUREMENT
.
CAUTION
I
F A SINGLE TUBE GAS SAMPLING PROBE IS USED FOR
P
RESSURE
/
DRAFT MEASUREMENTS
,
BE SURE THAT IT IS CLEAN AND DRIED
BEFORE CONNECTING TO THE PRESSURE INPUT
.
CAUTION
A +300
H
P
A
(
OR
–300
H
P
A
)
OVER
-
PRESSURE CAN PERMANENTLY DAMAGE THE PRESSURE SENSOR
.
3.2.3 Smoke Index Measurement (optional)
This method consists of taking a gas sample from the center of the gas pipe behind the heat exchanger and crossing it
through a special filter paper.
The color of the spot on the filter is compared with a graduated (from 0 to 9) reference scale and it is called “smoke
index”.
You can type in the instrument up to 3 smoke index values; the analyzer calculates the average value and print these
values on the report.
Normative and laws about the air pollution, describes the procedure: DIN51402, 2116, 2117 and 2297 VDI directives,
ASTM D 2156-63 T, etc.
3.2.3.1 Measuring Instruments (optional)
1. Smoke pump : it should suck 1.63 litres
±
0.07 l (normalized to 0°C, 760mmHg) through a 1 cm
2
filter.
2. Smoke index reference table : it is a grey scale sheet with 10 different areas numbered from 0 to 9. The number 0
corresponds to a 85%
±
2.5% reflection. Every area reflects 10% less than the previous one. The scale is used to
compare the scale with the paper filter and to calculate the smoke index.
3. Paper filter : When it is clean it has a reflection corresponding to the 0 scale index. It also has 3 litres per cm
2
a
minute (normalized to 0°C, 760mmHg) with a 200/800 mmwc resistance to the air flux.