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M300EU OPERATING INSTRUCTIONS M300EU
Addendum to M300E/EM Manual P/N 04288
The A1 and A2 channels output a signal that is proportional to the CO concentration of the sample gas. They
can be configured:
• With independent reporting ranges reporting a “single” output signal (SNGL Mode, see Section 6.3.3) o
• Be to operate completely independently (DUAL mode, see Section 6.3.4). In this mode the user can set
the measure span and signal scale of each output in a variety of combinations (but not the units of
measure).
EXAMPLE:
A1 OUTPUT: Output Signal = 0-5 VDC representing 0-1000 ppb concentration values
A2 OUTPUT: Output Signal = 0 – 10 VDC representing 0-500 ppb concentration values.
• Or to automatically switch between the two ranges dynamically as the concentration value fluctuates
(AUTO modes, see Section 6.3.5).
Both the A1 and A2 outputs can be:
• Configured full scale outputs of: 0 - 0.1 VDC; 0 - 1VDC; 0 - 5VDC or; 0 - 10VDC.
• Equipped with optional 0-20 mADC current loop drivers and configured for any current output within that
range (e.g. 0-20, 2-20, 4-20, etc.).
The user may also add a signal offset independently to each output (see Section 6.7.1) to match the electronic
input requirements of the recorder or data logger to which the output is connected.
DEFAULT SETTINGS
The default setting for these the reporting ranges of the analog output channels A1 and A2 are:
• SNGL mode
• 0 to 500.0 ppb
• 0 to 5 VDC
Reporting range span may be viewed via the front panel by viewing the RANGE test function. If the DUAL or
AUTO modes are selected, the RANGE test function d will be replaced by two separate functions, RANGE1 &
RANGE2. Reporting range status is also available as output via the external digital I/O status bits.
NOTE
Upper span limit setting for the individual range modes are shared. Resetting the span limit in one
mode also resets the span limit for the corresponding range in the other modes as follows:
SNGL DUAL AUTO
Range ÅÆRange1 (Low) ÅÆ Low Range
Range2 (Hi) ÅÆ High Range
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