Measurement data registers

Table 1. Measurement data registers (read-only)
Register number	Address	Register description	Data format	Unit and notes
Present values
21	0x0014	Methane	32-bit float	ppm_v
21	0x0015	Methane	32-bit float	ppm_v
23	0x0016	Acetylene	32-bit float	ppm_v
23	0x0017	Acetylene	32-bit float	ppm_v
25	0x0018	Ethylene	32-bit float	ppm_v
25	0x0019	Ethylene	32-bit float	ppm_v
27	0x001A	Ethane	32-bit float	ppm_v
27	0x001B	Ethane	32-bit float	ppm_v
29	0x001C	Carbon monoxide	32-bit float	ppm_v
29	0x001D	Carbon monoxide	32-bit float	ppm_v
31	0x001E	Carbon dioxide	32-bit float	ppm_v
31	0x001F	Carbon dioxide	32-bit float	ppm_v
33	0x0020	Total dissolved combustible gases (TDCG)	32-bit float	ppm_v
33	0x0021	Total dissolved combustible gases (TDCG)	32-bit float	ppm_v
35	0x0022	Hydrogen	32-bit float	ppm_v
35	0x0023	Hydrogen	32-bit float	ppm_v
37	0x0024	Moisture in oil	32-bit float	ppm_w
37	0x0025	Moisture in oil	32-bit float	ppm_w
39	0x0026	Temperature of in-oil measurement chamber	32-bit float	°C
39	0x0027	Temperature of in-oil measurement chamber	32-bit float	°C
41	0x0028	Relative moisture in oil See Calculating relative moisture saturation inside transformer	32-bit float	%RS
41	0x0029		32-bit float	%RS
43	0x002A	Total gas pressure (TGP)	32-bit float	hPa
43	0x002B	Total gas pressure (TGP)	32-bit float	hPa
24 hour average values
51	0x0032	Methane	32-bit float	ppm_v
51	0x0033	Methane	32-bit float	ppm_v
53	0x0034	Acetylene	32-bit float	ppm_v
53	0x0035	Acetylene	32-bit float	ppm_v
55	0x0036	Ethylene	32-bit float	ppm_v
55	0x0037	Ethylene	32-bit float	ppm_v
57	0x0038	Ethane	32-bit float	ppm_v
57	0x0039	Ethane	32-bit float	ppm_v
59	0x003A	Carbon monoxide	32-bit float	ppm_v
59	0x003B	Carbon monoxide	32-bit float	ppm_v
61	0x003C	Carbon dioxide	32-bit float	ppm_v
61	0x003D	Carbon dioxide	32-bit float	ppm_v
63	0x003E	Total dissolved combustible gases (TDCG)	32-bit float	ppm_v
63	0x003F	Total dissolved combustible gases (TDCG)	32-bit float	ppm_v
65	0x0040	Hydrogen	32-bit float	ppm_v
65	0x0041	Hydrogen	32-bit float	ppm_v
67	0x0042	Moisture in oil	32-bit float	ppm_w
67	0x0043	Moisture in oil	32-bit float	ppm_w
69	0x0044	Total gas pressure (TGP)	32-bit float	hPa
69	0x0045	Total gas pressure (TGP)	32-bit float	hPa
Rate of change (ROC), 24 hour
81	0x0050	Methane	32-bit float	ppm_v/d
81	0x0051	Methane	32-bit float	ppm_v/d
83	0x0052	Acetylene	32-bit float	ppm_v/d
83	0x0053	Acetylene	32-bit float	ppm_v/d
85	0x0054	Ethylene	32-bit float	ppm_v/d
85	0x0055	Ethylene	32-bit float	ppm_v/d
87	0x0056	Ethane	32-bit float	ppm_v/d
87	0x0057	Ethane	32-bit float	ppm_v/d
89	0x0058	Carbon monoxide	32-bit float	ppm_v/d
89	0x0059	Carbon monoxide	32-bit float	ppm_v/d
91	0x005A	Carbon dioxide	32-bit float	ppm_v/d
91	0x005B	Carbon dioxide	32-bit float	ppm_v/d
93	0x005C	Total dissolved combustible gases (TDCG)	32-bit float	ppm_v/d
93	0x005D	Total dissolved combustible gases (TDCG)	32-bit float	ppm_v/d
95	0x005E	Hydrogen	32-bit float	ppm_v/d
95	0x005F	Hydrogen	32-bit float	ppm_v/d
Rate of change (ROC), 7 days
101	0x0064	Methane	32-bit float	ppm_v/w
101	0x0065	Methane	32-bit float	ppm_v/w
103	0x0066	Acetylene	32-bit float	ppm_v/w
103	0x0067	Acetylene	32-bit float	ppm_v/w
105	ox0068	Ethylene	32-bit float	ppm_v/w
105	0x0069	Ethylene	32-bit float	ppm_v/w
107	0x006A	Ethane	32-bit float	ppm_v/w
107	0x006B	Ethane	32-bit float	ppm_v/w
109	0x006C	Carbon monoxide	32-bit float	ppm_v/w
109	0x006D	Carbon monoxide	32-bit float	ppm_v/w
111	0x006E	Carbon dioxide	32-bit float	ppm_v/w
111	0x006F	Carbon dioxide	32-bit float	ppm_v/w
113	0x0070	Total dissolved combustible gases (TDCG)	32-bit float	ppm_v/w
113	0x0071	Total dissolved combustible gases (TDCG)	32-bit float	ppm_v/w
115	0x0072	Hydrogen	32-bit float	ppm_v/w
115	0x0073	Hydrogen	32-bit float	ppm_v/w
Rate of change (ROC), 30 days
121	0x0078	Methane	32-bit float	ppm_v/m
121	0x0079	Methane	32-bit float	ppm_v/m
123	0x007A	Acetylene	32-bit float	ppm_v/m
123	0x007B	Acetylene	32-bit float	ppm_v/m
125	0x007C	Ethylene	32-bit float	ppm_v/m
125	0x007D	Ethylene	32-bit float	ppm_v/m
127	0x007E	Ethane	32-bit float	ppm_v/m
127	0x007F	Ethane	32-bit float	ppm_v/m
129	0x0080	Carbon monoxide	32-bit float	ppm_v/m
129	0x0081	Carbon monoxide	32-bit float	ppm_v/m
131	0x0082	Carbon dioxide	32-bit float	ppm_v/m
131	0x0083	Carbon dioxide	32-bit float	ppm_v/m
133	0x0084	Total dissolved combustible gases (TDCG)	32-bit float	ppm_v/m
133	0x0085	Total dissolved combustible gases (TDCG)	32-bit float	ppm_v/m
135	0x0086	Hydrogen	32-bit float	ppm_v/m
135	0x0087	Hydrogen	32-bit float	ppm_v/m
Gas ratios (24 hour average values)
141	0x008C	CH₄/H₂	32-bit float	-
141	0x008D	CH₄/H₂	32-bit float	-
143	0x008E	C₂H₂/C₂H₄	32-bit float	-
143	0x008F	C₂H₂/C₂H₄	32-bit float	-
145	0x0090	C₂H₂/CH₄	32-bit float	-
145	0x0091	C₂H₂/CH₄	32-bit float	-
147	0x0092	C₂H₆/C₂H₂	32-bit float	-
147	0x0093	C₂H₆/C₂H₂	32-bit float	-
149	0x0094	C₂H₄/C₂H₆	32-bit float	-
149	0x0095	C₂H₄/C₂H₆	32-bit float	-
151	0x0096	CO₂/CO	32-bit float	-
151	0x0097	CO₂/CO	32-bit float	-
Other
161	0x00A0	Time stamp of measurement result set, in seconds since start of Unix epoch	64-bit float (double)	s
	0x00A1
	0x00A2
	0x00A3
165	0x00A4	Index of measurement result set	32-bit integer	-
165	0x00A5	Index of measurement result set	32-bit integer	-
Custom averages
171	0x00AA	Methane	32-bit float	ppm_v
171	0x00AB	Methane	32-bit float	ppm_v
173	0x00AC	Acetylene	32-bit float	ppm_v
173	0x00AD	Acetylene	32-bit float	ppm_v
175	0x00AE	Ethylene	32-bit float	ppm_v
175	0x00AF	Ethylene	32-bit float	ppm_v
177	0x00B0	Ethane	32-bit float	ppm_v
177	0x00B1	Ethane	32-bit float	ppm_v
179	0x00B2	Carbon monoxide	32-bit float	ppm_v
179	0x00B3	Carbon monoxide	32-bit float	ppm_v
181	0x00B4	Carbon dioxide	32-bit float	ppm_v
181	0x00B5	Carbon dioxide	32-bit float	ppm_v
183	0x00B6	Total dissolved combustible gases (TDCG)	32-bit float	ppm_v
183	0x00B7	Total dissolved combustible gases (TDCG)	32-bit float	ppm_v
185	0x00B8	Hydrogen	32-bit float	ppm_v
185	0x00B9	Hydrogen	32-bit float	ppm_v
187	0x00BA	Moisture in oil	32-bit float	ppm_w
187	0x00BB	Moisture in oil	32-bit float	ppm_w
Present values as 16-bit signed integer
221	0x00DC	Methane	16-bit signed integer	ppm_v
222	0x00DD	Acetylene	16-bit signed integer	ppm_v
223	0x00DE	Ethylene	16-bit signed integer	ppm_v
224	0x00DF	Ethane	16-bit signed integer	ppm_v
225	0x00E0	Carbon monoxide	16-bit signed integer	ppm_v
226	0x00E1	Carbon dioxide	16-bit signed integer	ppm_v
227	0x00E2	Total dissolved combustible gases (TDCG)	16-bit signed integer	ppm_v
228	0x00E3	Hydrogen	16-bit signed integer	ppm_v
229	0x00E4	Moisture in oil	16-bit signed integer	ppm_w*10
230	0x00E5	Temperature of in-oil measurement chamber	16-bit signed integer	°C*10
231	0x00E6	Relative moisture in oil	16-bit signed integer	%RS*10
232	0x00E7	Total gas pressure (TGP)	16-bit signed integer	hPa

Measurement data registers - OPT100

OPT100 User Guide