Ametek 303B

Installation | 3-7
Pressure / Vacuum Pump Use
If the monitor is used to sample moisture in toxic or flammable gases, the GAS OUT must
exhaust to an area deemed safe and appropriate by the local authority having jurisdiction.
Due to the SAMPLE ADJUST flow controller restriction, if your sample pressure is less
than 69 kPa (10 psi) gauge, you must increase the pressure with either a pressure (option
A in figure 3-2) or a vacuum pump (option B). An AMETEK pump (PN 271803001) or
(271813001, 240V) can be used in either configuration. Keep in mind that some pressure
pumps will add moisture to the sample. If you plan to run your monitor with a vacuum
pump, proceed as follows:
1. Disconnect the line from the GAS IN or OUT fitting and interconnect it
with a tube union. Connect the pump to the union. Check the connec-
tion for leaks.
2. Connect the pump outlet or the GAS OUT fitting to vent in a safe area
if sampling a hazardous gas.
!
WARNING
90

to
1
30
V
ac
P
a
n
e
l
180to260VacPanel
POWERIN
90‐130Vac
47‐63Hz
20WMAX
POWERIN
180‐260Vac
47‐63Hz
20WMAX
Figure 3-1
303B - Rear Panel.