5200 Multi Purpose and 5200 Multi Purpose HF Gas Analysers
05230001A / Revision 9
49
6.6.2 Introduction to the milliAmp output parameters
The milliAmp output parameters that you must set up are as follows:
Parameter Values/options
Range 1 high level The Range 1 highest sample measurement (span) *.
Range 2 high level The Range 2 highest sample measurement (span) *.
During calibration The selected option determines how the milliAmp output
will operate during calibration:
Freeze As soon as the calibration screen is
displayed, the milliAmp output will ‘freeze’ at
its last output value. The output will only be
updated to reflect subsequent measurements
when calibration has been completed.
Follow The milliAmp output value will reflect the
measurement value, even during calibration.
Jam condition The selected option determines how the milliAmp output
will operate during a fault condition:
High The output value will be held at 21.5 mA.
Low The output value will be held at 0 mA.
None The output values will continue to be derived
from the sample gas measurements, even
though these output values may be
erroneous.
mA output range 0-20 mA or 4-20 mA *, configurable as follows:
0-20% to 0-100% O
2
(standard oxygen sensor)
0-1% to 0-100% O
2
(industrial or high accuracy
oxygen sensor)
0-10% to 0-100% of Full Scale Range
†
(infrared sensor)
Underrange Any value below 4 mA
#
* See Section 6.6.1.
† See Section 2.8.
# Only available if the 4-20 mA output range is selected; this sets the lowest out-
put current during normal operation, and allows negative gas concentrations
to be monitored through the milliAmp outputs. For example, with an under-
range setting of 3.8 mA, the milliAmp outputs can be less than 4 mA (which
indicates a zero gas concentration), down to a minimum of 3.8 mA, where an
output between 3.8 mA and 4 mA indicates a negative gas concentration.
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