purel PTS+20 Gebrauchs- Und Montageanleitung Seite 36

7 Installation
Method 2: By-pass installation
Note: In order to use the measurement chamber in a by-pass you must
ensure a pressure difference between P1 and P2 as indicated in the
picture below.
1. Connect the inlet of the chamber to your pipe system.
2. Connect the outlet of the chamber to your pipe system where the
pressure is known to be lower than the inlet pressure.
Note: The pressure difference P1 > P2 is needed to create a by-pass
flow through the chamber. If there is no pressure difference between P1
and P2, there will be no flow through the chamber and therefore the
response time will be very slow or the device will not even respond at
all to the dew point changes.
PTP-MK
PTS+20/-100 15