Register
number
Address
Register description
Data format
Unit
21
0014
hex
Water concentration
32-bit float
ppm
v
0015
hex
23
0016
hex
Water vapor pressure
32-bit float
hPa
0017
hex
25
0018
hex
Water vapor saturation
pressure
32-bit float
hPa
0019
hex
27
001A
hex
Enthalpy
32-bit float
kJ/kg
001B
hex
29
001C
hex
Water activity
32-bit float
a
w
001D
hex
31
001E
hex
Dew point temperature
difference
32-bit float
°C
001F
hex
33
0020
hex
Absolute humidity at NTP
32-bit float
g/m
3
0021
hex
35
0022
hex
Water concentration in oil
32-bit float
ppm
w
0023
hex
41
0028
hex
Relative saturation
32-bit float
%
0029
hex
43
002A
hex
Water concentration (wet
basis)
32-bit float
vol-%
002B
hex
45
002C
hex
Relative humidity (dew/frost) 32-bit float
%RH
002D
hex
65
0040
hex
Water mass fraction
32-bit float
ppm
w
0041
hex
Appendix A – Modbus reference
35