Bacharach INSIGHT manual Making a Draft / Pressure Measurement

Fyrite® INSIGHT

Undiluted Flue

Gas Sample Taken

Under Draft

Diverter in Top

of Fire Tube

Hot Water Tank

Atmospheric Burner or Gravity Vented Forced Air

Atmospheric or

Gravity Vented

Boiler

80% Eff. Fan Assist or Power Vented Furnace/Boiler

Fig. 4.1	90% Eff. Condensing
	Furnace/Boiler

Fyrite® INSIGHT

4.6 Making a Draft / Pressure Measurement

The difference in pressure (ΔP) between two areas can be measured by using the analyzer's two pressure ports and the PRESSURE screen. By using the -ΔP port as the reference, the pressure applied to the +ΔP port will be displayed on the PRESSURE screen as the differential pressure between the two ports. Perform a draft / pressure measurement as follows:

1.Turn ON the analyzer and allow it to complete its warm-up cycle.

2.Display the MAIN MENU by pressing the MENU (F2) button. If necessary, press ESC until MENU appears

above F2.

3.Use the ▲▼ buttons to select PRESSURE.

Press ENTER to display the Pressure screen.

4.Before taking a measurement, the pressure sensor may need to be re-zeroed if it is not already displaying zero with both pressure ports open to the atmosphere. If necessary, zero the pressure sensor as follows:

• Press the ZERO (F2) button.	F1	F2	F3
• Disconnect any hoses connected to the
+ΔP and -ΔP ports, and then press EN-
TER to zero the pressure sensor.
• Reconnect any hoses. When measuring
draft, leave the -ΔP port open to the at-
mosphere and connect the probe's draft
hose to the +ΔP port.
5. Do one of the following to measure draft or
differential pressure:
• To measure draft, insert the probe into
the stack and observe the draft reading
on the PRESSURE screen.
• To measure differential pressure, con-
nect two sampling hoses to the +ΔP
and -ΔP ports, and place the open end
of each hose into the areas being mea-

24 Instruction 24-9460 Instruction 24-9460 25