Campbell Scientific EC155 CO2 and H2O Closed-Path Gas Analyzer and EC100 Electronics with Optional CSAT3A 3D Sonic Anemometer - Manual (Page 48)

EC155 CO
2
and H
2
O Closed-Path Gas Analyzer
TABLE 10-1. Output Modes for EC100 Instruction
Output
Mode
Data
Field Description Units
0, 1, 2,
1 Ux m/s
2 Uy m/s
3 Uz m/s
4 Sonic Temperature ºC
5 Sonic Diagnostic Flag
6
CO
2
µmol/mol
7 H
2
O mmol/mol
8 Gas Diagnostic Flag
1, 2
9 Air Temperature ºC
10 Air Pressure kPa
11
CO
2
Signal Strength nominally 0.0 ≤ strength
≤1.0
12
H
2
O Signal Strength nominally 0.0 ≤ strength
≤1.0
2 13
Sample Cell Pressure
Differential
kPa
As shown, all output modes give two diagnostic values, the Sonic Diagnostic
Flag and the Gas Diagnostic Flag. The values contain a bit field, with each
bit representing a monitored condition. When a certain condition is detected,
the corresponding bit is set. The value remains set until the event that caused
the condition is no longer present. TABLE 10-2 and TABLE 10-3 below
describe the bits in the sonic diagnostic flag and the gas diagnostic flag,
respectively.
TABLE 10-2. Bits in the Sonic Diagnostic Flag
bit
hex
value decimal Name Function
0 0x1 1 Low Amp Amplitude is too low
1 0x2 2 High Amp Amplitude is too high
2 0x4 4 Tracking Poor signal lock
3 0x8 8 Hi 3 Axis DC Delta temperature exceeds
limits
4 0x10 16 Acquiring Acquiring ultrasonic
signals
5 0x20 32 Cal Mem Err Sonic head calibration
signature error
38