Analytical Industries GPR-2500 S Oxygen Analyzer - Manual (Page 8)

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wipe away.
¾ If the analyzer is equipped with an optional integral sampling pump (positioned downstream of the sensor) and
a flow control metering valve (positioned upstream of the sensor), completely open the flow control metering
valve to avoid drawing a vacuum on the sensor and placing an undue burden on the pump.
¾ Calibrate ambient area monitors with a certified span gas/
¾ Avoid calibration of ambient area monitors with the surrounding atmosphere unless assured the oxygen
content is 20.9%.
Moisture & Particulates: Installation of a suitable coalescing or particulate filter is required to remove
condensation, moisture and/or particulates from the sample gas to prevent erroneous analysis readings and
damage to the sensor or optional components. Moisture and/or particulates do not necessarily damage the sensor,
however, collection on the sensing surface can block or inhibit the diffusion of sample gas into the sensor resulting
in a reduction of sensor signal output – and the appearance of a sensor failure when in fact the problem is easily
remedied by blowing on the front of the sensor. Consult the factory for recommendations concerning the proper
selection and installation of components.
Moisture and/or particulates generally can be removed from the sensor by opening the sensor housing and either
blowing on the the sensing surface or gently wiping or brushing the sensing surface with damp cloth. Caution:
Minimize the exposure of ppm sensors to air during this cleaning process. Air calibration followed by purging with
zero or a gas with a low ppm oxygen concentration is recommended following the cleaning process. Moisture
and/or particulates generally can be removed from the sample system by flowing the purge gas through the
analyzer at a flow rate of 4.5-5 SCFH for an hour.
Mounting: The analyzer is approved for indoor use, outdoor use requires optional enclosures, consult factory.
Mount as recommended by the manufacturer.
Gas Connections: Inlet and outlet vent gas lines for ppm analysis require 1/8” or ¼” stainless steel compression
fittings; hard plastic tubing with a low permeability factor can be used percentage range measurements. Oxygen
analyzers designed for ambient area monitoring expose the sensor directly to the atmosphere being sampled and
thus have no gas connections.
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 is properly grounded and meets the requirements for area classification. Never yank wiring
to remove it from a terminal connection. AC powered analog analyzers consume 5 watts, digital analyzers 50 watts
without optional heaters. Optional 110V and 220V heaters AC powered heaters consume an additional 100-150
watts; DC powered digital analyzers consume 30 watts, 40 watts with the optional DC powered heater.
4 Features & Specifications
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