Instruction manual

Operation Fyrite
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INSIGHT
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Plus Manual
68 0024-9487 Rev 2
4.5. Making a Draft or 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.
Step Example Draft or Pressure Measurement Procedure
1 Confirm that testing prerequisites have been completed (see page 61).
2 Display the MAIN MENU by pressing the MENU (F2) button. If necessary,
press ESC until MENU appears above F2.
3 Use the UP () and DOWN () arrow 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.
• Disconnect any hoses connected to the +ΔP and -ΔP ports, and then
press ENTER to zero the pressure sensor.
• Reconnect any hoses. When measuring draft, leave the -ΔP port
open to the atmosphere 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, connect sampling hoses to the +ΔP
and -ΔP ports, and place the ends of the hoses into the two areas
being compared. The differential pressure between the two areas is
now displayed on the PRESSURE screen. If the pressure at the +ΔP
port is higher than the -ΔP port, the pressure reading will be positive.
If it is lower, the reading will be negative.