Teledyne 329R - Oxygen analyzer - Manual (Page 6)

TELEDYNE ANALYTICAL INSTRUMENTS 2
1.0 Introduction 329R
5. Analog Voltage Output. The Model 329R provides customer
connections to external devices, such as computers, recorders, alarms, etc.,
at 0–10 VDC, negative ground, plus contact closures for range identifica-
tion. Custom voltage outputs, either grounded or isolated, are available as
options.
6. Analog Current Output. The Model 329R has a 4–20 mA current
output suitable for connection to external devices that use a 4–20 mA
input. A 0–20 mA current output, either grounded or isolated, is available
as an option.
7. Over-Range/Cell Failure Visual Indicator. The model 329R has
a LED (Light Emitting Diode) to the left of the Liquid Crystal Display.
The LED will blink when the oxygen reading exceeds 105% of scale, or a
cell failure alarm is activated.
Micro-Fuel Cell
The Model 329R uses a Class E-2 Micro-Fuel Cell. The Micro-Fuel
Cell measures the concentration of oxygen in a gas stream. The analysis is
specific for oxygen; i.e. the measuring cell will not generate an output
current unless oxygen is present in the sample gas. Therefore, the analyzer
has an absolute zero, and requires no zero gas. Span calibration is per-
formed with atmospheric air as the span gas.
To eliminate any inaccuracies due to the positive temperature coeffi-
cient of the Micro-Fuel Cell, a thermistor circuit and network of precision
resistors produce a negative coefficient of matching characteristics. The
variable element (thermistor) in the compensation network is in the same
assembly as the Micro-Fuel Cell, exposing both devices to the same tem-
perature conditions.
Warranty Conditions
Customers having warranty claims must return the cell in question to
the factory for evaluation. If it is determined that failure is due to faulty
material or workmanship the cell will be replaced free of charge.
CAUTION: Evidence of tampering or abuse will render the warranty null
and void.
If a cell is working satisfactorily, but fails short of its warranty period,
the customer will receive credit, on a pro-rated basis, towards the purchase
of a replacement cell.