Teledyne 9110EH - Nitrogen Oxides Analyzer - Manual (Page 7)

Model 9110EH Instruction Manual M9110EH Documentation
10.3.4. Relay Board..................................................................................................... 182
10.3.4.1. Heater Control........................................................................................... 182
10.3.4.2. Valve Control ............................................................................................ 182
10.3.4.3. Status LEDs .............................................................................................. 182
10.3.5. Motherboard.................................................................................................... 183
10.3.5.1. A to D Conversion ...................................................................................... 183
10.3.5.2. Sensor Inputs............................................................................................ 183
10.3.5.3. Thermistor Interface................................................................................... 184
10.3.5.4. Analog Outputs.......................................................................................... 184
10.3.5.5. External Digital I/O .................................................................................... 185
10.3.5.6. I 2 C Data Bus ............................................................................................. 185
10.3.5.7. Power-up Circuit ........................................................................................ 185
10.3.6. Power Supply/ Circuit Breaker ............................................................................ 185
10.3.7. Communications Interface ................................................................................. 186
10.3.7.1. Front Panel ............................................................................................... 187
10.3.7.2. Display..................................................................................................... 187
10.3.7.3. Keypad..................................................................................................... 188
10.3.7.4. Front Panel States LED’s ............................................................................. 188
10.3.7.5. Display / Keyboard Interface Electronics........................................................ 188
10.4. Software Operation ................................................................................................. 189
10.4.1. Adaptive Filter ................................................................................................. 189
10.4.2. Calibration - Slope and Offset............................................................................. 190
10.4.3. Temperature/Pressure Compensation (TPC) ......................................................... 191
10.4.4. NO
2
Converter Efficiency Compensation ............................................................... 192
10.4.5. Internal Data Acquisition System (iDAS) .............................................................. 192
11. TROUBLESHOOTING & REPAIR ....................................................................................193
11.1. General Troubleshooting .......................................................................................... 193
11.1.1. Warning Messages............................................................................................ 194
11.1.2. Fault Diagnosis with Test Functions..................................................................... 194
11.1.3. Using the Diagnostic Signal I/O Function.............................................................. 195
11.1.4. Status LED’s .................................................................................................... 196
11.1.4.1. Motherboard Status Indicator (Watchdog) ..................................................... 196
11.1.4.2. CPU Status Indicator .................................................................................. 197
11.1.4.3. Relay Board and Status LEDs....................................................................... 197
11.2. Gas Flow Problems.................................................................................................. 199
11.2.1. Zero or Low Flow Problems ................................................................................ 200
11.2.1.1. Sample Flow is Zero or Low ......................................................................... 200
11.2.1.2. Ozone Flow is Zero or Low .......................................................................... 201
11.2.2. High Flow........................................................................................................ 202
11.2.3. Sample Flow is Zero or Low But Analyzer Reports Correct Flow ............................... 202
11.3. Calibration Problems ............................................................................................... 202
11.3.1. Negative Concentrations.................................................................................... 202
11.3.2. No Response ................................................................................................... 203
11.3.3. Unstable Zero and Span .................................................................................... 204
11.3.4. Inability to Span - No SPAN Key ......................................................................... 204
11.3.5. Inability to Zero - No ZERO Key.......................................................................... 205
11.3.6. Non-Linear Response ........................................................................................ 205
11.3.7. Discrepancy Between Analog Output and Display .................................................. 206
11.3.8. Discrepancy between NO and NO
X
slopes ............................................................. 206
11.4. Other Performance Problems .................................................................................... 206
11.4.1. Excessive noise................................................................................................ 206
11.4.2. Slow Response................................................................................................. 207
11.4.3. Auto-zero Warnings .......................................................................................... 207
11.5. Subsystem Checkout............................................................................................... 208
11.5.1. Simple Vacuum Leak and Pump Check................................................................. 208
11.5.2. Detailed Pressure Leak Check............................................................................. 208
11.5.3. Performing a Sample Flow Check ........................................................................ 209
11.5.4. AC Power Configuration..................................................................................... 210
11.5.5. DC Power Supply.............................................................................................. 210
11.5.6. I 2 C Bus ........................................................................................................... 211
M9110EH Rev 0 vii