5 – Installation and set-up
MultiExact Gas Analyser
Parameter
Values/options
Range 1 low level
The range 1 lowest sample measurement
Range 1 high level
The range 1 highest sample measurement (span) *
Range 2 low level
The range 2 lowest sample measurement
Range 2 high level
The range 2 highest sample measurement (span) *
During calibration
The selected option determines how the mA output will
operate during calibration:
Freeze
As soon as the calibration screen is displayed,
the mA output will 'freeze' at its last output value.
The output will only be updated to reflect
subsequent measurements when calibration
screen has been exited.
Follow
The mA output value will reflect the measurement
value, even during calibration.
Jam condition
The selected option determines how the mA output will
operate during a fault condition:
High
The output value will be held at 21.5 mA
(suitable for trace measurements)
Low
The output value will be held at 0 mA
(suitable for purity measurements)
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 *
Underrange
Any value below 4 mA
#
Range change point
The range change point
†
Hysteresis
The range change hysteresis
†
* See Section 5.7.1.
†
Only available when Auto range is selected.
#
Only available if the 4 – 20 mA output range is selected; this sets the lowest output current
during normal operation, and allows out of range and negative gas concentrations to be
monitored through the mA output. For example, with an under-range setting of 3.8 mA, the
mA output can be less than 4 mA (which indicates a the Range low level), down to a
minimum of 3.8 mA, where an output between 3.8 mA and 4 mA indicates a gas
concentration below the range low level.
52
05410001A / Revision 6
