Specifications

748420-A
August 1999
18
Trace Oxygen Analyzer Module
Rosemount Analytical NGA 2000
3
S
TARTUP AND
O
PERATION
3.7 R
OUTINE
O
PERATION
The TO2 Analyzer Module is designed to analyze the sample stream continuously.
Normally, it is never powered off except for servicing or for a prolonged shutdown.
Maximum permissible interval between calibration checks depends on the analytical
accuracy required, and therefore cannot be specified. Initially, the instrument should be
checked at least once every 3-4 months. This practice should continue until experience
indicates that some other interval is more appropriate.
For details as to the general operation of the NGA analyzer module software, and the use of
IO modules with the TO2 module, see the Platform Components manual.
3.8 A
LARM INDICATION
NGA analyzer modules continuously monitor a number of internal parameters. It is possible
to make the analyzer generate certain kinds of alarm indications if these parameters' values
exceed or reduce below specified levels. The general alarm variable will have its value
changed if an alarm occurs. See the NGA Reference manual for further details.
DESCRIPTION TYPE
Low Electrolyte WARNING
Low Sample Flow WARNING
Sleep Mode WARNING
Low Sensor Temperature WARNING
High Sensor Temperature WARNING
Software Error FAILURE
T
ABLE
3-1. T
RACE
O
XYGEN
A
NALYZER
M
ODULE
A
LARMS