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Model 400E Ozone Analyzer
Instruction Manual
6.5.1. Physical Range vs. Measurement Range
Functionally, the Model 400E O
capable of determining O
architecture improves reliability and accuracy by avoiding the need for extra,
switchable, gain-amplification circuitry.
Most applications do not require the full 0-10,000 ppb range. The analyzer includes
software that configures and scales a "Measurement Range" to allow the user to
optimize the analyzer's operation for their specific application.
The span of the instrument's Measurement Range is also used during calibration
procedures. This ensures that the portion of the hardware Physical Range being
recorded is calibrated as accurately as possible. Additionally, the scale and limits
selected for the Measurement Range also sets the ranges of the analyzer's A1 and
A2 Analog outputs.
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
Measurement Range(s) of the instrument.
6.5.2. Measurement Range Modes
The first step in configuring the A1 and A2 outputs is to choose a Measurement
Range mode. There are three analog output range modes to choose from:
Single range mode sets a single maximum range for the analog output. If Single
range is selected 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 6.5.3).
Dual range allows the A1 and A2 outputs to be configured measurement spans
(see Section 6.5.4) as well as separate electronic signal levels (see Section 6.6).
Auto range mode gives the analyzer to ability to output data via a low range
(RANGE1) and high range (RANGE2) on a single analog output. The M400E will
automatically switch between the two ranges dynamically as the concentration
value fluctuates.
If Dual or Auto range is selected, the RANGE TEST Function displayed on the front
panel during SAMPLE mode will be replaced by two separate functions, RANGE1 &
RANGE2.
Range status is also output via the External Digital I/O Status Bits (see
Section 6.8.1).
P/N 04316 Rev: B
Analyzer has one hardware Physical Range that is
3
concentrations between 0 ppm and 10,000 ppb. This
3
Operating Instructions
73
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