Vaisala HMD60 Series - Calculated Humidity Objects

B.5 Calculated Humidity Objects
Table 31 Calculated Humidity Object Instances
Instance Name Description Unit
3 "Td" "Dewpoint" 62/64 (ºC / ºF)
4 "Tdf" "Dew/Frostpoint" 62/64 (ºC / ºF)
5 "Tw" "Wet bulb
temperature"
62/64 (ºC / ºF)
6 "a" "Absolute humidity" 217/2000 grams-per-
cubic-meter / grains-
per-cubic-foot -
Vaisala defined unit
7 "x" Mixing ratio 28/2001 grams-of-
water-per-kilogram-
dry-air / grains-of-
water-per-pound -
Vaisala defined unit
8 "h" Enthalpy 149/24 kilojoules-per-
kilogram-dry-air /
btus-per-pound-dry-
air
Table 32 Calculated Humidity Object Properties
Property Data Type (Application
Datatype)
Writable
(Conforman
ce Code)
Value or Initial
Value
Persistence
Object_Identifier BACnetObjectIdentifier No (R) 00 00 00 xx
(hex)
Object Type = 0,
Instance = x (see
Table 31
(page 67))
Fixed
Object_Name CharacterString No (R) See Table 31
(page 67)
Fixed
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 31
(page 67)
Fixed
Appendix B – BACnet Reference
67