72 Getting Started 083730300A DCN8101
2.5.4 SETUP>AUTOCAL (WITH VALVE OPTION)
Auto Cal, automatic zero/span calibration or calibration check, is available with installed
valve options (see Sections 2.3.2 and 4.3).
2.5.5 SETUP>VARS
Vars are software variables that define operational parameters automatically set by the
instrument’s firmware, and are user-adjustable through this menu. Access the menu to see
the list of variables; select a variable to view its description; touch the Edit button to
change its setting(s).
Table 2-13. List of Variables with Descriptions
NOTE: This list includes several of the more common Vars; selecting any Var in the NumaView™ software
interface will display its description in the information field to its right. Depending on configuration, some, all,
or more of these variables appear in your instrument’s Vars menu.
Conc Precision (or
PRIGAS/SECGAS
Sets the number of significant digits to the right of the decimal point display
of concentration and stability values. (“PRIGAS” = primary gas with two or
more other gases; “SECGAS” = secondary gas)
Daylight Savings Enable Enable or disable Daylight Savings Time (also see
Setup>Instrument>Date/Time Settings)
Dilution Factor Option Sets the instrument to
compensate for diluted sample gas, such as in
continuous emission monitoring (CEM) where the quality of gas in a smoke
stack is being tested and the sampling method used to remove the gas from
the stack dilutes the gas.
Once the degree of dilution is known, this feature
allows the user to add an appropriate scaling factor to the analyzer’s CO
concentration calculations so that the undiluted values for measurement
range and concentration are shown on the instrument’s front
and reported via the instrument’s various outputs.
Dynamic Zero Enable Dynamic zero automatically adjusts offset and slope of the CO response
when performing a zero point calibration during an AutoCal (Section 4.3).
Dynamic Span Enable Dynamic span automatically adjusts the offset and slope of the CO response
when performing a span point calibration during an AutoCal (Section 4.3).
[Enable] Software
Maintenance Mode
Set instrument to continue sampling, while ignoring
calibration, diagnostic,
and reset instrument commands. This feature is of particular use for
instruments connected to Multidrop (Section 2.3.1.7) or Hessen protocol
networks (see Sections 2.5.10, 3.4.2).
Instrument ID Set unique identifier number for the instrument when it is connected with
other instruments in multidrop configuration or on the same Ethernet LAN, or
when applying MODBUS or Hessen protocols. (Setup>Vars>Instrument ID)
Controls range mode, single (SNGL) or dual (DUAL).
Total system runtime hours
Enables or disables the Temperature and Pressure Compensation (TPC)
feature (For information on TPC, see Section 6.5.4).
Change the concentration units of measure.
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