Eclipse Combustion EGA4 Manuale Utente
Instruction Manual MM850481 ed.01
N
OTE
: T
O OBTAIN AN ACCURATE MEASURE IT IS RECOMMENDED TO WAIT
3/5
MINUTES
.
Toxic gas sensor can be present a ±2% drift and a long resuming time it an excessive (>150% of F.S.) gas concentration
is applied. In that case it is recommended to wait for a measured value lower than 20ppm, by sucking fresh air before
switch the analyzer off.
An optional Electro-valve can be installed inside the instrument to exclude/include manually or automatically the CO cell
when the CO concentration is too high (e.g. when the burner is starting)
Four acoustic and visual alarm levels can be set on four programmable parameters.
4.2 Auxiliary
measurements
4.2.1 Temperature
measurements
The instrument is equipped with two temperature inputs to measure exhaust gas and the burner air input temperatures
(combustion gas).
(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 1000°C. Temperature measurement and gas sampling from the flue
gas pathway are thus always performed at the same site. The probe is connected to the apparatus with
compensated cable and connector. An internal Pt100 resistance thermometer is used for cold junction
compensation.
800°C and for short-term measurements up to 1000°C. Temperature measurement and gas sampling from the flue
gas pathway are thus always performed at the same site. The probe is connected to the apparatus with
compensated cable and connector. An internal Pt100 resistance thermometer is used for cold junction
compensation.
♦ The same Tc K input can be used to measure the flow and return temperature in water circuit. If you have to
measure the water temperature measuring the pipe temperature, use an arch-model thermocouple with an
appropriate diameter.
appropriate diameter.
♦ A remote Pt100 sensor, can be supplied on request with a 2 or 5 meter cable to measure the air inlet temperature in
forced air boiler. This option is very important for an accurate efficiency calculation.
4.2.2
Pressure and Draft
The analyzer can be equipped with a temperature compensated pressure sensor to measure the chimney draft or
pressure. The pressure range is from –1500.0 to + 1500.0 mmwc (±150.00 hPa)
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. The instrument
sensor is differential type and, if connected to a Pitot tube, it can be used to measure gas speed.
N
pressure. The pressure range is from –1500.0 to + 1500.0 mmwc (±150.00 hPa)
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. The instrument
sensor is differential type and, if connected to a Pitot tube, it can be used to measure gas speed.
N
OTE
: W
E SUGGEST TO EXECUTE THE AUTOZERO PROCEDURE FOR MORE ACCURACY BEFORE PERFORM 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 DRY
BEFORE CONNECTION TO THE PRESSURE INPUT
.
CAUTION
A +300
H
P
A
(
OR
–300
H
P
A
)
OVER
-
PRESSURE CAN PERMANENTLY DAMAGE THE PRESSURE SENSOR
.
4.2.3
Smoke index measurement
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.
through a special filter paper.
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