Vaisala HMW90 - Manual (Page 98)

User's Guide _______________________________________________________________________
96 ___________________________________________________________________ M211399EN-F
Calculated Humidity Objects
These Analog Input Objects exist only in the HMW95 model.
Table 28 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 29 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
above
Nonvolatile
Object_Name CharacterString No (R) See table 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