Specifications

Instruction 0024-9460 28
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.
• 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-
F1 F2 F3