| Code/Flag Figure |
Description |
Status |
|
0
|
VIZ Mark II carbon hygristor
|
Operational
|
|
1
|
VIZ B2 hygristor
|
Operational
|
|
2
|
Vaisala A-Humicap
|
Operational
|
|
3
|
Vaisala H-Humicap
|
Operational
|
|
4
|
Capacitance sensor
|
Operational
|
|
5
|
Vaisala RS90
|
Operational
|
|
6
|
Sippican Mark IIA carbon hygristor
|
Operational
|
|
7
|
Twin alternatively heated Humicap capacitance sensor
|
Operational
|
|
8
|
Humicap capacitance sensor with active de-icing method
|
Operational
|
|
9
|
Carbon hygristor
|
Operational
|
|
10
|
Psychrometer
|
Operational
|
|
11
|
Capacitive (polymer)
|
Operational
|
|
12
|
Capacitive (ceramic, including metal oxide)
|
Operational
|
|
13
|
Resistive (generic)
|
Operational
|
|
14
|
Resistive (salt polymer)
|
Operational
|
|
15
|
Resistive (conductive polymer)
|
Operational
|
|
16
|
Thermal conductivity
|
Operational
|
|
17
|
Gravimetric
|
Operational
|
|
18
|
Paper-metal coil
|
Operational
|
|
19
|
Ordinary human hair
|
Operational
|
|
20
|
Rolled hair (torsion)
|
Operational
|
|
21
|
Goldbeater's skin
|
Operational
|
|
22
|
Chilled mirror hygrometer
|
Operational
|
|
23
|
Dew cell
|
Operational
|
|
24
|
Optical absorption sensor
|
Operational
|
|
25-30
|
Reserved for future use
|
Operational
|
|
31
|
Missing value
|
Operational
|