Bacharach Fyrite INSIGHT Instructions Manual page 41

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
• 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 two sampling hoses to
the +ΔP and -ΔP ports, and place the open end of each hose into
the areas being measured. 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 pres-
sure reading will be positive. If it is lower, the reading will be
negative.
F3
Fyrite INSIGHT
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