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The Air Monitor BACnet stack supports the optional property
"DESCRIPTION".
This is used to indicate the type of information in the object.
For example, for an ELECTRA-flo system, the description will
indicate as "Total Flow" for average flow, or "Avg Temp" for
average temperature. If the object belongs to a sensor in the
system, it will be indicated as "SensorN Velocity" or "SensorN
Flow", where N is the sensor address. The number of AI objects
is determined by the total number of sensors in the system x
2 with an additional 2 AI objects for system average flow and
system average temperature. For example, an ELECTRA-flo
system with 8 sensors will have a total of 18 AI objects.
Analog Input Objects
Object Identifier
Analog Input 1
Analog Input 2
Analog Input (2 + X)
Analog Input (3 + X)
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Function
Average Flow Rate
Average Temperature
Sensor X Velocity
Sensor X Temperature
Usage of Status Flags
• Each object supports status bits IN_ALARM, FAULT, and
OUT_OF_SERVICE.
• The OOS property indicates the physical input to the object
is not in service.
This will be set by the transmitter if someone intentionally
removes the sensor from the network. If the transmitter
determines there is a problem with any sensor in question,
the OOS bit is set along with the FAULT bit. If the OOS
property is set, data from the physical device will not be
used in any calculation.
• IN_ALARM is set for values which exceed the predetermined
values set in the transmitter memory. This field only affects
the Avg Temp and Avg Flow Analog Input objects
BACnet Engineering Units for Analog Inputs (Defaults)
Flow Rates: Cubic feet per minute, Liters per minute
Temperatures: Degrees Fahrenheit, Degrees Celsius
Analog Input Objects (Dual Channel)
Object Identifier
Analog Input 0
Analog Input 1
Analog Input 2
Analog Input 3
Analog Input 4
Analog Input 5
Analog Input 6
Analog Input 7
The number of Sys_1_Vel & Sys_1_Temp objects will vary
depending on the number of sensors provided with the
channel 1 probe(s).
Analog Input X
Analog Input X + 1
The number of Sys_2_Vel & Sys_2_Temp objects will vary
depending on the number of sensors provided with the
channel 2 probe(s).
3/21 IOM-ELECTRA-FLO-INST
Function
Average Sys1 Flow
Average Sys1 Temperature
Average Sys2 Flow
Average Sys2 Temperature
Sys Flow Plus
Sys Flow Minus
Sys_1_Velocity_1
Sys_1_Temperature_1
Sys_2_Velocity_1
Sys_2_Temperature_1
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