Vaisala HUMICAP HMW92 - Calculated Humidity Objects; Table 23 Calculated Humidity Objects; Table 24 Calculated Humidity Object Properties; Table 25 Status Flags

User's Guide _______________________________________________________________________
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Calculated Humidity Objects
These Analog Input Objects exist only in the HMW95 model.
Table 23 Calculated Humidity Objects
Instance
Name
Description
Unit
4
"Td"
"Dewpoint"
62/64 (ºC/ ºF)
5
"Tdf"
"Dewpoint"
62/64 (ºC/ ºF)
6
"dTd"
"Dewpoint depression"
121/120 (ΔºK/ ΔºF)
7
"Tw"
"Wet bulb temperature"
62/64 (ºC/ ºF)
8
"a"
"Absolute humidity"
217/2000 grams-per-cubic-meter / grains-per-cubic-foot
(Vaisala defined unit)
9
"x"
"Mixing ratio"
28/2001 grams-of-water-per-kilogram-dry-air / grains-of-
water-per-pound (Vaisala defined unit)
10
"h"
"Enthalpy"
149/24 kilojoules-per-kilogram-dry-air / btus-per-pound-of-
dry-air
Table 24 Calculated Humidity Object Properties
Property
Data type
(Application Type)
Writable
(Conformance
Code)
Value or Initial Value
Persistence
Object_Identifier
BACnetObjectIdentifier
No (R)
00 00 00 xx (hex)
Object Type = 0,
Instance = x
See Table 23 above.
Nonvolatile
Object_Name
CharacterString
No (R)
See Table 23 above.
Nonvolatile
Object_Type
BACnetObjectType
(ENUMERATED)
No (R)
0 (Analog Input)
Fixed
Present_Value
Real
Yes
(When Oos) (R)
0.0
Volatile
Description
CharacterString
No (O)
See table above
Nonvolatile
Units
BACnetEngineeringUnits
(ENUMERATED)
No (R)
See table above
Nonvolatile
Status_Flags
BACnet Status Flags (BIT
STRING)
Yes (when OoS)
(R)
0 (FAULT == FALSE)
Volatile
Reliability
BACnet Reliability
(ENUMERATED)
Yes (when OoS)
(O)
0 (NO FAULT DETECTED)
Volatile
Event State
BACnetEventState
(ENUMERATED)
No (R)
0 (NORMAL)
Volatile
Out_of_Service
BOOLEAN
Yes (R)
0 (FALSE)
Volatile
COV_Increment
Real
Yes (O)
NaN (COV reporting
disabled)
Nonvolatile
Table 25 Status Flags
Flag
State
Cause
IN_ALARM
FALSE
Event State equals 0 (NORMAL)
TRUE
Event State not 0
FAULT
FALSE
Reliability equals 0 (NO FAULT DETECTED)
TRUE
Reliability not 0
OVERRIDDEN
FALSE
Always FALSE
OUT_OF_SERVICE
FALSE
Present Value may NOT be written via BACnet
TRUE
Present Value may be written via BACnet