Diagnostics in EddyPro on the SmartFlux System

Diagnostic information for the gas analyzer and sonic anemometer may be encoded in the data file. This information is then used by EddyPro to determine whether to use or discard the value. Details on EddyPro processing are provided in the EddyPro documentation. Here we provide a summary of the diagnostic information.

Gas analyzer diagnostics in EddyPro

The LI-7500DS diagnostic bit associated with each data record is logged in the .ghg data file as a column. EddyPro reads the diagnostic bit to determine how to use each value. The diagnostic bit description and EddyPro action are given in Table 8‑3.

Table 8‑3. Diagnostics information for the LI-7500DS.

Bit (0=BAD, 1=OK)	Description	EddyPro Action if Bad
0-3	AGC	Calculate AGC
4	Sync	Keep the record
5	PLL	Discard the Record
6	Detector	Discard the Record
7	Chopper	Discard the Record

Sonic anemometer diagnostics

Diagnostics from sonic anemometers are encoded as described by the manufacturer, except for the CSAT3B. All anemometer diagnostics are summarized below.

WindMaster/Pro

The Gill WindMaster/Pro diagnostic tatus codes are logged in the dataset. EddyPro on the SmartFlux System either uses or excludes the data based on the status codes.

Table 8‑4. WindMaster/Pro diagnostics information.

Status Code	Description	EddyPro Action
00	OK: When the diagnostic value is zero, data are OK	Keep
01	Sample Failure: Insufficient samples in the average period from Transducer Pair 1	Discard
02	Sample Failure: Insufficient samples in the average period from Transducer Pair 2	Discard
03	Sample Failure: Insufficient samples in the average period from Transducer Pair 3	Discard
04	Sample Failure: Insufficient samples in the average period from Transducer Pairs 1 and 2	Discard
05	Sample Failure: Insufficient samples in the average period from Transducer Pairs 1 and 3	Discard
06	Sample Failure: Insufficient samples in the average period from Transducer Pairs 2 and 3	Discard
07	Sample Failure: Insufficient samples from all Transducer Pairs	Discard
08	NVM Error: NVM Checksum failed	Discard
09	ROM Error: ROM Checksum failed	Discard
0A	System gain at Maximum: Results OK, but marginal operation	Keep
0B	Retries: Retries used	Keep

HS-50

The Gill HS-50 diagnostics are encoded in the dataset. EddyPro on the SmartFlux System either uses or excludes the data based on the status codes.

Table 8‑5. HS-50 diagnostics information

Status Code Bit	Value	Description	EddyPro Action
	0	No error	Keep
0	1	Transducer Pair 1 failed	Discard
1	2	Transducer Pair 2 failed	Discard
2	4	Transducer Pair 3 failed	Discard
3	8	Reserved
4	16	Memory error	Discard
5	32	PRT failed	Discard

CSAT3

The Campbell Scientific, Inc. CSAT3 sonic anemometer diagnostics are logged with the dataset as a diagnostic value. EddyPro Software on the SmartFlux System extracts the 4 bits (12-15) out of diagnostic variable and treats it as 4 bit number (shifted to the right). If one of the bits is set the resulting integer is recorded in the data file.

Diagnostic Value	Decodes to	CSAT3 Bit Set
0	0000	None
1	0001	b12
2	0010	b13
3	0011	b12 and b13
4	0100	b14
5	0101	b12 and b14
6	0110	b13 and b14
7	0111	b12, b13, and b14
8	1000	b15
9	1001	b12 and b15
10	1010	b13 and b15
11	1011	b12, b13, and b15
12	1100	b14 and b15
13	1101	b12, b14, and b15
14	1110	b13, b14, and b15
15	1111	b12, b13, b14, and b15

The CSAT3 diagnostics and the way they are treated in EddyPro are given in Table 8‑6.

Table 8‑6. CSAT3 diagnostics information.

Bit Set	Value	Description	EddyPro Action
	0	OK: When the diagnostics value is zero, data are OK.	Keep
12	4096	Sonic signal amplitude is too low: There may be an obstruction in the anemometer path or on the transducer face.	Discard
13	8192	Sonic signal amplitude too high: An obstruction was removed from the anemometer path or the transducer face.	Discard
14	16384	Low signal: The anemometer path length may have been altered or the anemometer head is broken.	Discard
15	32768	Difference in the speed of sound between the three non-orthogonal axes is greater than 2.360 m s-1 (~4 °C @ 25 °C): The anemometer path length may have been altered or the anemometer head is broken.	Discard

CSAT3B

CSAT3B diagnostic values are logged in the data set.

Table 8‑7. CSAT3B diagnostics information.

Bit Set	Value	Description	EddyPro Action
	0	OK: When the diagnostics value is zero, data are OK.	Keep
0	1	Low amplitude: Ultrasonic signal is too small.	Discard
1	2	High amplitude: Ultrasonic signal is too large.	Discard
2	4	Tracking: The signal lock is poor	Discard
3	8	High Delta C: Difference in the speed of sound between the three non-orthogonal axes is greater than 2.360 s-1 (~4 °C @ 25 °C).	Discard
4	16	Acquiring: Indicates that the anemometer is trying to acquire the sonic signal.	Discard
5	32	Low voltage: The supply voltage to the anemometer is below 9.0 VDC	Discard
6	64	Trigger error: A measurement trigger has not been received for at least 1 second, or the time interval between triggers is varying by greater than 5%.	Discard
7	128	Internal humidity warning: The relative humidity inside the CSAT3B block is greater than 80%	Discard
8	256	Memory error: There is a signature mismatch from the calibration file or another section of memory.	Discard

METEK

Diagnostic information from the METEK Class and Cage ultrasonic anemometers is encoded in the data file. The status is stored in the data file as a decimal number 0 to 7. This number represents an encoded three-digit binary value. You can use an online decimal-to-binary converter or simply refer to the table below to decode the diagnostic value.

Diagnostic Value (Decimal)	Decodes To (Binary)	Description	EddyPro Action
0	000	Normal	Keep
1	001	Heater is on	Discard
2	010	Heater failure or error	Discard
3	011	Heater is on and has an error	Discard
4	100	Output is NaN (not a number)	Discard
5	101	Output is NaN; heater is on	Discard
6	110	Output is NaN; heater failure or error	Discard
7	111	Output is NaN; heater is on and has an error	Discard

Heater failures or errors (2, 3, 6, and 7) may occur if the heater is not powered or if the power supply is inadequate.

RM Young

Diagnostic information from the RM Young anemometers is encoded in the data file.