Model 70
The AMI model 70R1 is the ideal solution for
measuring oxygen in non-flammable gases in a general purpose
environment. In a very small size, and at low cost, it provides a
complete electronic package with a full set of features together with a
zirconium oxide sensor that has an expected ten year life, with
virtually no calibration required.
Traditional electrochemical oxygen analyzers suffer
from poor stability, requiring monthly calibration and frequent sensor
replacement, and they suffer from sensitivity to both temperature
changes and barometric pressure changes. Their reading can change by as
much as 10% when a weather change occurs. The AMI model 70R1 suffers
from none of these issues. It has been tested over a temperature range
of 0°F to 120°F.
Its sensor is unaffected by flow rate changes over
the range of 0.1 to 5 SCFH, and as a result AMI is able to use an
orifice to control the flow.
The analyzer is built around a modified version of
the same electronic architecture used in most of AMI’s advanced
analyzers. Two microprocessors working together provide a vast amount
of functionality, with the industry’s most intuitive front panel
controls married to the most complete PC user interface. For advanced
users, ModBus RTU over RS-485 is also provided as standard.
Alarm set points, the range over which the 4-20mA or
0-1VDC output is spanned, and calibration are controlled by press
buttons. These can be disabled via the user interface if desired for
greater security.
Complete control over the analyzer’s operation, and
access to its many diagnostic features, are available via the AMI
software running on a PC, connected via a standard USB cable.
Diagnostic features include a datalog – ten days plus
of complete records of the oxygen reading; calibration history for the
previous five calibrations; brown out and power up history, including
memory errors if any; ambient temperature, sensor heater voltage and
calibration factors; and for advanced users, the ability to “tweak” the
linearity to match reference gases.
Optional ranges of 0-50% and 0-95% available. |
