Bacharach Flue-Gas Sample Conditioning System Especificaciones descargar pdf (Pagina 31)

ECA 450 Operation

Instruction 0024-9400

2.14 Primary Air Temperature Measurement

To properly calculate net stack temperature, the analyzer must know the

burner’s primary air temperature. The following sections describe four

methods of measuring and supplying this temperature value to the analyzer.

2.14.1 Thermocouple Method

A thermocouple that is plugged into the T-AIR connector (see Figure 1-1)

provides the analyzer with the most up-to-date primary air temperature

information for combustion efficiency calculation purposes. Refer to Section

1.5.2 T-AIR.

If the burner’s primary-air supply is being drawn in from the room, then

simply place the thermocouple where it can sample room air. If, however, the

air supply is being drawn in from an outside source, where the temperature

is different from that of room air, then immerse the thermocouple into the

burner’s primary-air stream.

Note that when a thermocouple is plugged into the T-AIR connector, its

temperature reading takes priority over all other methods of temperature

measurement.

When viewing the T-AIR value on the Combustion Test HOLD/RUN screen,

the designation (T) will appear to the left of the temperature value. The letter

“T” signifies that a Thermocouple is being used to measure the primary air

temperature.

For example:

T-AIR 86.5 °F (T)

2.14.2 Probe Thermocouple Method

This method has an operator taking a one-time primary air temperature

measurement using the probe’s T-STACK thermocouple, and then storing the

measurement in the analyzer’s temperature memory buffer.

When viewing the T-AIR value on the Combustion Test HOLD/RUN screen,

the designation (M) will appear to the left of the temperature value. The

letter “M” signifies that the primary air temperature value was Measured.

For example:

T-AIR 86.5 °F (M)

Measure the primary air temperature using the probe’s thermocouple, and

store that measurement as follows:

1. Press SETUP key to display the Setup List screen.

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Bacharach Flue-Gas Sample Conditioning System Especificaciones Pagina 31