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Infrared Gas Analyzer Installation 2
2-11
Teledyne Analytical Instruments
Table 2-8: Commands via RS-232 Input
Command Description
as<enter> Immediately starts an autospan.
az<enter> Immediately starts an autozero.
rp<enter> Allows reprogramming of two
System
functions:
APPLICATION (gas use) and ALGORITHM (linearization).
st<enter> Toggling input. Stops/Starts any status message output from
the RS-232, until st<enter> is sent again.
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 7300A 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 10-50psig
with a typical flow rate of 0.1 to 0.6 SCFH (50-250 cc/min) is needed.
Bottled gas is recommended (air or Nitrogen) if high quality air is not avail-
able.
For accurate calibration, the analyzer requires blended gas mixtures
certified to +/- 2% accuracy.