Teledyne 3110 – Portable Trace/Percent Oxygen Analyzer, FM-approved configuration - Manual (Page 11)

Portable Trace Oxygen Analyzer Introduction
Teledyne Analytical Instruments 3
 LEDs:
Two front panel-mounted LEDs are used
to indicate low battery condition and when
the battery is recharging.
 Contrast Control: This feature allows the user to easily
adjust the contrast of the display for
optimum viewing under different lighting
conditions. The adjustment is made using
a front panel control dial.
 Percent of Range Voltage Output: A 0-1 VDC output is
available that represents the percentage of
the current analysis range.
 Data Logger:
The optional built-in data logging feature
allows the user to specify the time interval
between data recording sets. The date,
time, and oxygen concentration readings
are stored in internal RAM at the user
specified interval. The data set can be
downloaded using the instrument’s 9-pin
serial interface.
 Real-time Clock:
This feature allows the Model 3110 to date
and time stamp the data set recorded on
the data logger. It uses a 24 hour clock.
 Quick Disconnect Fittings: Dual self-sealing quick disconnect
fittings are installed for easy sample
connections.
1.3 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
linear, but minute signal produced by the transducer from trace oxygen
is amplified by a two-stage amplifier. Sensor output signal is digitized
and fed to the microprocessor. Additional signal conditioning and
temperature compensation are handled electronically and appropriate
signals are directed to the display and output ports.