Teledyne T360 Manuel d'utilisateur télécharger pdf (Page 98)

Operating Instructions Teledyne API Model T360/T360M Operation Manual

4.8.1. Physical Range versus Analog Output Reporting Ranges

Functionally, the Gas Filter Correlation CO

Analyzer has one hardware Physical

Range that is capable of determining CO

concentrations between 50 ppm and

2,000 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 50 ppm and 2,000 ppm physical range.

Because, most applications use only a small part of the analyzer’s physical range,

the width of the Model T360’s physical range can create data resolution problems

for most analog recording devices. For example, in an application where the

expected concentration of CO

is typically less 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 T360 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.

4.8.2. Reporting Range Modes

The T360 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 4.8.3) both outputs are

slaved toge

ther 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 4.13.4).



Dual rang

e (

DUAL) allows the A1 and A2 outputs to be configured with

different measurement spans (see Section 4.8.4) as well as separate

electronic sig

nal levels (see Section 4.13.4).

 Auto rang

e (

AUTO) mode gives the analyzer to ability to output data via a

low range and high range. When this mode is selected (see Section 4.8.5)

the T360 will automatically swit

ch between the two ranges dynamically as the

concentration value fluctuates.

Range status is also output via the external digital I/O status outputs (see Section

4.15.1).

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Teledyne T360 Manuel d'utilisateur Page 98

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