E Instruments BTU900 Manual page 10

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in Fig. 2.2). This probe is used to measure the combustion air temperature, within a range of -10° C to +100° C,
when boiler efficiency is to be calculated precisely.
Pressure sensor
The instrument features an internal piezoresistive sensor to measure the stack draft (negative pressure) and
other parameters if required (gas network pressure, pressure drop across filters etc.). The user can switch from
flue gas analysis to this reading by simply pressing a key.
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Sample and + / - pressure inputs
The positive input P+ and negative input P- are used simultaneously to measure differential pressure.
Pos. H H H H in Fig. 2.2 is the input of the sample probe complete with water separator and particulate filter. Pos.
G G G G
in Fig. 2.2 are respectively the positive and negative internal differential pressure sensor inputs.
The positive input P+
draft in accordance with standard UNI10845; the branch of the fume exhaust probe without the anti-condensation
filter should be connected to it for simultaneous draft measurement and combustion analysis.
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Fuel types
The instrument has been programmed with the technical characteristics that are typical of seven common fuels.
By means of the optional PC configuration program, this list and the relative coefficients may be modified for up
to a total of 10 fuels.
The following chart, derived from standard UNI 10389-1, lists the coefficients of the seven memorized fuels, used
for calculating losse s and efficiencies.
A1
4
0,280
0,0305
0,0306
0,0305
0,0354
5
0,0320
0,0305
0,0277
0,0277
0,0277
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Smoke measurements
It is possible to enter the smoke values measured according to the standard Smoke index scale. The instrument
will calculate the average and print the results in the analysis report.
An external smoke pump, available as an optional, must be used to correctly take this measurement.
Measuring ambient /room air CO (Carbon Monoxide)
Probe for monitoring the concentration of CO and checking safe conditions in the boiler room. An acoustic and
visual warning signal is given if the thresholds are exceeded according to the OSHA levels.
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Internal gas leak detector sensor
This sensor searches for explosive gas leaks in the pipes.
External low pressure sensor (draft gauge)
This sensor is a particular draft gauge with precision (± 0.5 Pa) and resolution (0.1 Pa) characteristics higher than
those of the sensor installed inside the instrument. This makes it possible to comply with the UNI 10845 standard.
8
Burner pressure verification probe
It must be used to measure burner pressure of the gas-powered boiler so it can be regulated in real time. It is
made of a silicone tube, 8x4mm and 1 metre long, complete with connector for connecting to the analyzer.
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is used to measure pressure in general. The positive input P+
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Coefficients for calculating combustion efficiency
A2 B
0,3276 0,0090
0,4789 0,0066
0,4835 0,0066
0,4789 0,0066
0,6700 0,0071
0,5952 0,0000
0,4789 0,0066
0,4500 0,0073
0,3795 0,0073
0,3878 0,0073
CO t % Fuel
2
11,70 Natural gas
15,70 #2 Oil
15,80 #4 Oil
15,70 Diesel
19,01 Wood/Pellets 8%
18,60 Coal
15,70 Bio-Fuel 5%
13,80 LPG
14,00 Butane
13,70 Propane
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and
is used to measure
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K8000 000 00EJ 02 065 0A0 17 051 2