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M300E DOCUMENTATION Model 300E Carbon Monoxide Analyzer
Instruction Manual
6 P/N 04288 Rev: A
9.3.3.
Performing Leak Checks ................................................................................................ 150
9.3.4.
Performing a Sample Flow Check .................................................................................. 152
9.3.5.
Flow Calibration.............................................................................................................. 153
9.3.6.
Cleaning the Optical Bench ............................................................................................ 154
9.3.7.
Cleaning Exterior Surfaces of the M300E ....................................................................... 154
10. THEORY OF OPERATION ....................................................................... 155
10.1. M
EASUREMENT
M
ETHOD
......................................................................................................... 156
10.1.1.
Beer’s Law ................................................................................................................... 156
10.1.2.
Measurement Fundamentals........................................................................................ 156
10.1.3.
Gas Filter Correlation ................................................................................................... 157
10.2. P
NEUMATIC
O
PERATION
.......................................................................................................... 161
10.2.1.
Sample Gas Flow......................................................................................................... 161
10.2.2.
Critical Flow Orifice ...................................................................................................... 162
10.2.3.
Sample Pressure Sensor.............................................................................................. 162
10.2.4.
Sample Flow Sensor .................................................................................................... 163
10.2.5.
Particulate Filter ........................................................................................................... 163
10.2.6.
Valve Options............................................................................................................... 163
10.3. E
LECTRONIC
O
PERATION
........................................................................................................ 164
10.3.1.
Overview ...................................................................................................................... 164
10.3.2.
CPU ............................................................................................................................. 166
10.3.3.
Optical Bench & GFC Wheel ........................................................................................ 166
10.3.4.
Synchronous Demodulator (Sync/Demod) Assembly ................................................... 169
10.3.5.
Relay Board ................................................................................................................. 173
10.3.6.
Mother Board ............................................................................................................... 175
10.3.7.
Power Supply/ Circuit Breaker...................................................................................... 178
10.4. I
NTERFACE
............................................................................................................................. 179
10.5. S
OFTWARE
O
PERATION
.......................................................................................................... 182
10.5.1.
Adaptive Filter .............................................................................................................. 183
10.5.2.
Calibration - Slope and Offset ...................................................................................... 184
10.5.3.
Measurement Algorithm ............................................................................................... 184
10.5.4.
Internal Data Acquisition System (iDAS) ...................................................................... 185
11. TROUBLESHOOTING & REPAIR PROCEDURES .................................. 187
11.1. G
ENERAL
T
ROUBLESHOOTING
H
INTS
....................................................................................... 187
11.1.1.
Interpreting WARNING Messages................................................................................ 188
11.1.2.
Fault Diagnosis with TEST Functions........................................................................... 191
11.1.3.
Using the Diagnostic Signal I/O Function ..................................................................... 193
11.1.4.
Internal Electronic Status LED’s ................................................................................... 195
11.2. G
AS
F
LOW
P
ROBLEMS
............................................................................................................ 199
11.2.1.
Typical Flow Problems ................................................................................................. 199
11.3. C
ALIBRATION
P
ROBLEMS
......................................................................................................... 201
11.3.1.
Miss-Calibrated ............................................................................................................ 201
11.3.2.
Non-Repeatable Zero and Span................................................................................... 202
11.3.3.
Inability to Span – No SPAN Key.................................................................................. 202
11.3.4.
Inability to Zero – No ZERO Key .................................................................................. 203
11.4. O
THER
P
ERFORMANCE
P
ROBLEMS
.......................................................................................... 203
11.4.1.
Temperature Problems................................................................................................. 203