APPENDIX A - SPECIFICATIONS
nvoCellLife output
Thisvariablereportsthetotalcellliferemaining.Thisiscelltypespecic,butistypicallysetfornew
cartridges at 2 years of service. It is reported in hours of life.
NvoNextCal output
This variable reports when the next calibration is required. The default is 6 months of service
between calibrations. It is reported in hours (interval starts at 4320hrs and counts to zero).
nvoLastCal output
This variable indicates the time since last calibration, counting back from current time.
nvoCellType output
This string contains the name of the gas that the installed cartridge is capable of detecting. It is the
same string that appears on the front panel of the transmitter. For example CO or HF. This has a 5
character maximum.
nvoConc output
Thisisthegasconcentrationasaoatingpointnumber.Theunitsarethesameas
nvoAlarmThresh1, see above.
nvoConcFS output
Thisoatingpointnumberreportsthemaximumconcentrationthattheinstalledsensoriscapableof
measuring. The units are the same as nvoAlarmThresh1, see above.
nvoConcType output
This string contains the measurement units for the installed cartridge. Possible values include ppm,
%V/V and %LEL.
A.4.4 Virtual Function Block
Thefournetworkcongurationinputsappearinavirtual functional block in Echelon LonMaker3.
nciMaxSendT input
This controls the time period between updates of bound but unchanging network variable outputs.
The default is 20 seconds but this can be changed from 1 to 59 seconds depending on installation-
specicneeds.
nciAlarmSetT input
Reporting of alarm events over LonWorks may be delayed by up to 59 seconds by setting this
parameter to a non-zero value. However this has no effect on alarm reporting over the analog
current loop or the local relays.
Thisisincludedtosuppressephemeralalarmeventswhichmaybecausedbyuctuationsin
temperature, pressure, or humidity or by strong radio-frequency interference. The default value of
zero is recommended for most applications.
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