Teledyne GFC 7001E Setup  Rnge Analog Output Reporting Range Configuration, Model Range

Basic Operation Model GFC7001E Carbon Dioxide Analyzer

6.6.SETUP  RNGE: ANALOG OUTPUT REPORTING RANGE CONFIGURATION

6.6.1.PHYSICAL RANGE VERSUS ANALOG OUTPUT REPORTING RANGES

Functionally, the GFC 7001E Family of CO Analyzers have one hardware PHYSICAL RANGE that is capable of determining CO concentrations between across a very wide array of values.

Table 6-7: GFC 7001E Family Physical range by Model

MODEL	RANGE
GFC 7001E	0 – 1000 ppm
GFC 7001EM	0 – 5000 ppm

This architecture improves reliability and accuracy by avoiding the need for extra, switchable, gain-amplification circuitry. Once properly calibrated, the analyzer’s front panel will accurately report concentrations along the entire span of its physical range.

Because many applications use only a small part of the analyzer’s full physical range, this can create data resolution problems for most analog recording devices. For example, in an application where an GFC 7001E is being used to measure an expected concentration of typically less than 50 ppm CO, the full scale of expected values is only 4% of the instrument’s full 1000 ppm measurement range. Unmodified, the corresponding output signal would also be recorded across only 2.5% of the range of the recording device.

The GFC 7001E/EM Analyzers solve 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 this REPORTING RANGE of the analog outputs is scaled, the physical range of the analyzer and the readings displayed on the front panel remain unaltered.

NOTE

Both the iDAS values stored in the CPU’s memory and the concentration values reported on the front

panel are unaffected by the settings chosen for the reporting range(s) of the instrument.

Teledyne Analytical Instruments 97