Teledyne 7120 - NDIR analyzer User Manual
Page 22
2 Installation
Model 7120
2-14
Teledyne Analytical Instruments
st
Toggling input. Stops/Starts any status message output from
the RS-232, until st
Implementation: The RS-232 protocol allows some flexibility in its
implementation. Table 2-9 lists certain RS-232 values that are required by
the Model 7120 implementation.
Table 2-9: Required RS-232 Options
Parameter
Setting
Baud
2400
Byte
8 bits
Parity
none
Stop Bits
1
Message Interval
2 seconds
2.4
Gas Requirements
Instrument Air is required for zeroing of the Infrared Analyzer. It must
be free of oil, particulates and water vapor (that will not condensate,
unfiltered plant air is not recommended). A supply pressure of 10-
100psig with a typical flow rate of 2 scfh (1 lpm) is needed. Bottled gas is
recommended (air or Nitrogen) if high quality air is not available.
For accurate calibration, the analyzer requires blended gas mixtures
certified to +/- 2% accuracy.
2.5
Testing the System
Before plugging the instrument into the power source:
•
Check the integrity and accuracy of the fluid connections. Make
sure there are no leaks.
•
Check the integrity and accuracy of the electrical connections.
Make sure there are no exposed conductors
•
Check that sample pressure is controlled accuracately and is
maintained between 0 to 10 psig, according to the requirements
of your process.
NOTE: Special designed systems may require checks under vacuum
or high pressure (consult manual addendum).
Power up the system, and test it by performing the following
operations: