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2. SUPPORTING EQUIPMENT AND SERVICES
2.1 Sampling Equipment. The customer must provide a means of controlling the
pressure and flowrate of the sample gas. For positive pressure applications, TAI suggests a
simple throttle valve installed in the sample line between the sample point and the analyzer. The
flowrate should be limited to between 0.5 and 5 liters/min.
IMPORTANT: If a pressure regulator is necessary or desirable, it must have a metallic
diaphragm. Regulators with organic or plastic diaphragms are permeable to oxygen and, if used
in the sampling system, will lead to high oxygen readings.
For atmospheric pressure sampling, connect a pump and flow control valve downstream from the
analyzer and draw (rather than push) the sample through the instrument.
TAI supplies three (3) male disconnect fittings with the instrument. One for installation of the
customer’s sample line; one to be used to open the vent fitting of the instrument, (equipped with
a plastic tube) and one for calibration purposes.
2.2 Power Service. A source of single phase, 100 to 125 volt, 50 or 60 Hertz power,
capable of delivering a maximum of 1/4 ampere of current will be periodically required to
recharge the instrument’s battery power supply. An eight (8) foot, 3-wire detach- able power
cord is provided with the instrument and should be stored in a safe place when not in use. As a
no cost option the 311XL can be furnished with 220 volt, 50 or 60 Hertz charging power.
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3. OPERATION