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Operating System
12 | Model ta3000R Gas Purity Monitor
For carbon monoxide and hydrogen, the equilibrium reactions are as fol-
lows:
CO + HgO (solid) => CO
H
+ HgO (solid) => H
2
Under continuous operation, the effective life of the mercuric oxide bed is
approximately one year. Contamination of carrier gases with reactive com-
pounds such as sulfides, chlorides, and aromatics will irreversibly impair
reactivity and will necessitate bed replacement. Care should be taken to
bypass the instrument if these compounds are present in the sample gas
stream.
High concentrations of hydrogen and carbon monoxide will use up the
active sites in the reaction bed faster than lower level concentrations.
A six-button keypad enters commands to the microprocessor, which moni-
tors detector operation, controls heated zones, and operates all internal
valve functions. External signal outputs for a data collection system or
host computer are located at the rear panel.
The microprocessor control system allows complete unattended operation
of the ta3000R. This onboard system performs necessary operational and
analytical functions such as:
•
Analyzer Status Control
•
Contaminant identification
•
Concentration Calculations
•
Calibration
•
Sampling Frequency
•
Data Output
•
Alarm Output
Data is presented via the front display panel. Alternatively data may be
obtained through an RS232 serial computer interface and HP parallel
printer interface located on the rear panel.
With optional interface kits, two components may be assigned to separate
trend channels to provide a continuous signal proportional to the con-
centration of the assigned component. These trend signals are updated
following each run and can be tracked by a data logger or host computer.
+ Hg (vapor)
2
O + Hg (vapor)
2
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