Campbell Scientific IRGASON IRGASON Integrated CO2/H2O Open-Path Gas Analyzer - Page 45

Bits in the Sonic Diagnostic Flag, Output Modes for EC100 Instruction

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IRGASON® Integrated CO2/H2O Open-Path Gas Analyzer and 3D Sonic Anemometer TABLE 10-1. Output Modes for EC100 Instruction Output Data Mode Field 1 2 3 4 0, 1, 2, 5 6 7 8 9 10 1, 2 11 12 2 13 Description Ux Uy Uz Sonic Temperature Sonic Diagnostic Flag CO2 Density H2O Density Gas Diagnostic Flag Air Temperature Air Pressure CO2 Signal Strength H2O Signal Strength Sample Cell Pressure Differential Units m/s m/s m/s ºC mg/m3 g/m3 ºC kPa nominally 0.0 ≤ strength ≤1.0 nominally 0.0 ≤ strength ≤1.0 kPa As shown in TABLE 10-1, all output modes give two diagnostic values: Sonic Diagnostic Flag and 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 describe the bits in the sonic diagnostic flag and the gas diagnostic flag, respectively. TABLE 10-2. Bits in the Sonic Diagnostic Flag hex bit value 0 0x1 1 0x2 2 0x4 3 0x8 4 0x10 5 0x20 decimal 1 2 4 8 Name Low Amp High Amp Tracking Hi 3 Axis DC 16 Acquiring 32 Cal Mem Err Function Amplitude is too low Amplitude is too high Poor signal lock Delta temperature exceeds limits Acquiring ultrasonic signals Sonic head calibration signature error 35

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IRGASON
®
Integrated CO
2
/H
2
O Open-Path Gas Analyzer and 3D Sonic Anemometer
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
Density
mg/m
3
7
H
2
O Density
g/m
3
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 in TABLE 10-1, all output modes give two diagnostic values:
Sonic
Diagnostic Flag
and
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
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
35