Advanced Instruments Inc.
Inlet Pressure
Sample inlet should be set 5-30 PSIG; this pressure allows easy control of the sample flow with a flowmeter or by
using a metering valve and a flow indicator.
Outlet Pressure
Ideally, the sample must be vented to ambient pressure or in a vent with pressure no greater than the 1-2 PSIG. If
the sample is vented to a line where pressure may change, a back pressure regulated set at no greater 1-2 PSIG
must be installed on the downstream of the sensor to ensure a constant pressure on the sensor.
Flow Rate
Flow rates of 1-5 SCFH cause no appreciable change in the oxygen reading. However, flow rates above 5 SCFH may
generate a backpressure on the sensor and cause erroneous oxygen readings.
Caution
Do not place your finger over the vent (it pressurizes the sensor) to check the sample flow when gas is
flowing to the sensor. Removing your finger (the restriction) generates a vacuum on the sensor and may
damage the sensor (voiding the sensor warranty).
Moisture & Particulates
Installation of a suitable coalescing and or particulate filter is required to remove liquid condensates, and/or
particulates from the sample gas to prevent clogging of the sampling system. Moisture and/or particulates do not
necessarily damage the sensor itself but collection of moisture/particulate on the sensing surface can block or inhibit
the diffusion of sample gas into the sensor thus resulting in a reduction of sensor signal output – and the appearance
of a sensor failure. Consult factory for recommendations concerning the proper selection of coalescing/particulate
filters.
Moisture and/or particulates collected at the sensor may be removed by either blowing on the sensing surface or
gently wiping the sensing surface with damp cloth.
Mounting
The standard analyzer is approved for indoor use only. Outdoor use requires optional enclosures, consult factory.
Mount analyzer as recommended in this manual.
The analyzer is configured for panel mounting and requires a 7.5x10.8” (T configuration) cutout with 4 holes for the
analyzer’s front panel. Optional configurations include a panel mount (TO configuration) with 7.75x7.75” cutout; 19”
bezel for rack mounting either the T or TO; 12x12x8” wall mount enclosure (GPR-1600W) and 18.2x16x10” panel
mount configuration (GPR-1600W-306).
Gas Connections
Inlet and outlet vent gas lines for PPM analysis require 1/8” or ¼” stainless steel compression fittings and SS tubing;
hard plastic tubing with a low gas permeability factor may be used for measurements above 100 PPM oxygen.
Power
Supply power to the analyzer only as rated by the specification or markings on the analyzer enclosure. The wiring
that connects the analyzer to the power source should be installed in accordance with recognized electrical
standards. Ensure that the analyzer enclosure is properly grounded and meets the requirements of
recommended local electrical standards.
Never yank wiring to remove it from a terminal connection.
AC or DC powered analyzers consume a maximum of 7 watts.
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