Teledyne TurbO2 - Portable trace oxygen analyzer - Manual (Page 6)

2
TURBO
2
Portable Trace Oxygen Analyzer
Teledyne Analytical Instruments
The linear, but minute, signal produced by the transducer from trace
oxygen is amplified by a two stage amplifier. The dual stages of amplifica-
tion provide enough gain to drive the 0-100 microampere meter and ther-
mistor controlled network utilized to compensate for the positive temperature
coefficient of the transducer.
Features
Micro-Fuel Cell:The Micro-fuel Cell (U.S. Pat. #s 3,767,552 and
3,668,101) is a sealed electrochemical transducer with no electrolyte to
change or electrodes to clean. When the cell reaches the end of its useful life,
it is merely thrown away and replaced, as one would replace a worn-out
flashlight battery. The life of the cell is warranted by TAI (see Cell War-
ranty, page 11).
Reliable Calibration: The unique qualities of the Micro-fuel Cell
allows the user to calibrate the instrument with the most economical, reliable,
abundant, standardization gas there is—atmospheric air.
The special CAL range of the instrument features a mark that coincides
with the 209,000 PPM oxygen concentration of air. By drawing air through
the instrument (see Calibration, page 6) reliable calibration can be achieved.
After the electronics have been properly zeroed (a one-time factory
operation), the instrument cannot produce an output indication in the absence
of oxygen; therefore, there is no need for a zero standardization gas.
Integral Power Supply: For pump option 4, the differential power
requirement (+ and – 3.6 VDC) of the instrument amplifier is furnished by
two internally mounted 750 milliampere•hour NiCad batteries. Fully
charged, these batteries will provide enough power to operate the instrument
continuously for a period of about 45 days with the pump option OFF. With
the pump option ON, the batteries will provide continuous operation for
about 8 hours. With the pump option OFF, an overnight charge of 14–16
hours on a one-month duty cycle should keep the original batteries supplied
usable for many years. With the pump option ON, charge 14–16 hours on
an 8-hour duty cycle.
An integral charging circuit and a detachable power cord are provided
so that the batteries may be recharged from any 50 or 60 cycle, 105 to 125
volt (90 to 110 volt optional), outlet.