Teledyne GFC-7000E - Trace CO2 Analyzer - Manual (Page 68)

Model GFC7000E Instruction Manual Operating Instructions
04584 Rev A1 57
than 500 ppm, the full scale of expected values is only 25% of the instrument’s 2 000 ppm
physical range. Unmodified, the corresponding output signal would also be recorded across only
25% of the range of the recording device.
The MGFC7000E solves this problem by allowing the user to select a scaled reporting range for the
analog outputs that only includes that portion of the physical range relevant to the specific
application. Only the reporting range of the analog outputs is scaled, the physical range of the
analyzer and the readings displayed on the front panel remain unaltered.
6.7.2. Reporting Range Modes
The MGFC7000E provides three analog output range modes to choose from.
• Single range (SNGL) mode sets a single maximum range for the analog output. If single
range is selected (see Section 6.7.3) both outputs are slaved together and will represent
the same measurement span (e.g. 0-50 ppm), however their electronic signal levels may
be configured for different ranges (e.g. 0-10 VDC vs. 0-.1 VDC – See Section 6.9.4.1).
Dual range (DUAL) allows the A1 and A2 outputs to be configured with different
measurement spans (see Section 6.7.4) as well as separate electronic signal levels (see
Section 6.9.4.1).
• Auto range (AUTO) mode gives the analyzer to ability to output data via a low range and
high range. When this mode is selected (see Section 6.7.5) the MGFC7000E will
automatically switch between the two ranges dynamically as the concentration value
fluctuates.
Range status is also output via the External Digital I/O Status Bits (see Section 6.13.1.1).
To select the Analog Output Range Type press: