11984 Rev 01 Page 5 of 8
1.3 Requirements
Figure 1-3: Minimum House Exhaust requirements can be calculated from the installation
set up.
P
Exit
= Pressure Drop through exit or condenser plumbing.
P
Contrroller
= Pressure drop through the Controller.
P
Facility
= Pressure drop through facilities plumbing prior to main H.E. duct.
P
Sense
: Measured Process Pressure
Process pressure or set-point is the operating pressure (negative or positive)
within the “sealed” vertical chamber. With the Sentry 1510, this measurement is
taken at the furnace exit at the transition block (noted by P
Sense
on Figure 1-3)
which connects the quartz exit tube with the Teflon exhaust piping reflecting the
“true” process pressure (P
Process
). The closer the measurement is taken to the
tube, the less pressure difference arises due to pipe length. This is depicted on
Figure 1-3 as Zone A.
P
Exit
: Pressure Drop between Furnace Exit and Controller
This area is noted in the attached Figure 1 as zone B. This pressure drop can be
simply calculated by taking a measurement at the inlet of the Sentry unit and then
subtracting this measurement from the pressure measured at the furnace exit.
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