Teledyne TurbO2 - Portable trace oxygen analyzer - Manual (Page 5)

1
Portable Trace Oxygen Analyzer TURBO
2
Teledyne Analytical Instruments
Introduction
The Teledyne Analytical Instruments Model TURBO
2
is a portable
trace oxygen analyzer which does not need an external power source to
operate, and can be reliably calibrated without the use of additional calibra-
tion gases.
The instrument provides for trace oxygen analysis in measuring ranges
of 0-100, 0-1,000 and 0-10,000 PPM (full scale), plus a special calibration
range that encompasses the known oxygen concentration of atmospheric air
(209,000 PPM).
Sample oxygen is read from an extremely accurate integral meter (0.5%
linearity) whose range of measurement is determined by the position of the
range selector switch. The 100-division meter scale and the multiplying
factor indicated by the position of the range switch determine the full scale
oxygen sensitivity of the instrument.
Sample gas is introduced and vented via a pair of quick disconnect
fittings that feature integral shutoff valves which automatically close when
the mating male fitting is withdrawn. The fittings are an integral part of the
measuring cell manifold so that internal sample passage volume is at an
absolute minimum. Sample flow control, although not critical (0.1 to 10
liters/min.), is either accomplished with accessory equipment or by the
addition of a pump and flowmeter (TURBO
2
P).
Method of Analysis
The sample oxygen is measured by a unique electrochemical transducer
which functions as a fuel cell; in this instance, the fuel is oxygen. Oxygen
diffusing into the cell reacts chemically to produce an electrical current that is
proportional to the oxygen concentration in the gas phase immediately
adjacent to the transducer’s sensing surface. The Micro-fuel Cell is a Class
S-2, designed for a quick recovery time from air to low PPM levels of
oxygen.