Teledyne GFC 7001E User Manual Page 283
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- TROUBLESHOOTING
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Troubleshooting & Repair Model GFC7001E Carbon Dioxide Analyzer
Teledyne Analytical Instruments 283
13.2.2.4. Displayed Flow = “Warnings”
This warning means that there is inadequate gas flow. There are four conditions that might cause this:
1. A leak upstream or downstream of the flow sensor
2. A flow obstruction upstream or downstream of the flow sensor
3. Bad Flow Sensor Board
4. Bad pump
To determine which case is causing the flow problem, view the sample pressure and sample flow functions on
the front panel. If the sample pressure is reading abnormally low, then the cause is likely a flow obstruction
upstream of the flow sensor. First, check the sample filter and make sure it is not plugged and then
systematically check all the other components upstream of the orifice to ensure that they are not obstructed.
If the sample pressure is reading normal but the sample flow is reading low then it is likely that the pump
diaphragm is worn or there is an obstruction downstream of the flow sensor.
13.2.2.5. Actual Flow Does Not Match Displayed Flow
If the actual flow measured does not match the displayed flow, but is within the limits of 720-880 cm
3
/min, adjust
the calibration of the flow measurement as described in Section 12.3.4.
13.2.2.6. Sample Pump
The sample pump should start immediately after the front panel power switch is turned ON. With the Sample
Inlet plugged, the test function PRES should read about 10 in-Hg for a pump that is in good condition. The pump
needs rebuilding if the reading is above 10 in-Hg. If the test function SAMP FL is greater than 10 cm
3
/min there
is a leak in the pneumatic lines.
13.3. CALIBRATION PROBLEMS
13.3.1. MISCALIBRATED
There are several symptoms that can be caused by the analyzer being miscalibrated. This condition is indicated
by out of range Slopes and Offsets as displayed through the test functions and is frequently caused by the
following:
1. Bad span gas. This can cause a large error in the slope and a small error in the offset. Delivered from
the factory, the GFC 7001E Analyzer’s slope is within ±15% of nominal. Bad span gas will cause the
analyzer to be calibrated to the wrong value. If in doubt have the span gas checked by an independent
lab.
2. Contaminated zero gas. Excess H
2
O can cause a positive or negative offset and will indirectly affect
the slope.
3. Dilution calibrator not set up correctly or is malfunctioning. This will also cause the slope, but not the
zero, to be incorrect. Again the analyzer is being calibrated to the wrong value.
4. Too many analyzers on the manifold. This can cause either a slope or offset error because ambient
gas with its pollutants will dilute the zero or span gas.
- MODEL GFC 7001E FAMILY 1
- CARBON MONOXIDE ANALYZERS 1
- SAFETY MESSAGES 3
- WARRANTY 5
- ABOUT THIS MANUAL 7
- TABLE OF CONTENTS 9
- ...................257 14
- LIST OF APPENDICES 16
- LIST OF FIGURES 16
- LIST OF TABLES 18
- PART I 21
- GENERAL INFORMATION 21
- INTRODUCTION 23
- 1.2.1. USING THIS MANUAL 25
- SPECIFICATIONS AND APPROVALS 27
- 2.3. TUV DESIGNATION 29
- 2.4. CE MARK COMPLIANCE 29
- GETTING STARTED 31
- ENERAL SAFETY HAZARD 36
- LECTRICAL SHOCK HAZARD 36
- Back of the instrument 37
- Sides of the instrument 37
- 3.3. ELECTRICAL CONNECTIONS 38
- A1 39
- 2 A3 A4 39
- 3.4. PNEUMATIC CONNECTIONS 42
- 3.4.1.2. Span Gas 43
- 3.4.2.1. Sample Gas Source 45
- 3.5. INITIAL OPERATION 46
- 3.5.1. STARTUP 47
- 3.5.2. WARM UP 48
- 3.5.3. WARNING MESSAGES 48
- 3.5.4. FUNCTIONAL CHECK 50
- 3.6.1. INTERFERENTS FOR CO 51
- MEASUREMENTS 51
- ANALYZERS WITHOUT OPTIONS 51
- 3.6.3. O 56
- 3.6.4. CO 56
- FREQUENTLY ASKED QUESTIONS 57
- 4.2. GLOSSARY 58
- VOLTAGE OUTPUTS 63
- 5.6.1.1. Gas Flow Rate 64
- 5.6.1.2. Valve Control 64
- 5.6.2.3. Input Gas Venting 66
- 5.6.2.4. Exhaust Outlet 66
- (OPTION 50E) 71
- 5.7. COMMUNICATION OPTIONS 73
- 5.7.3. ETHERNET (OPTION 63A) 74
- 5.8. SECOND GAS SENSORS 75
- Sensor 76
- 5.9.1. CO 77
- 5.9.2. THEORY OF OPERATION 77
- 5.11. SPECIAL FEATURES 82
- PART II 83
- OPERATING INSTRUCTIONS 83
- BASIC OPERATION 85
- 6.2. SAMPLE MODE 86
- 6.3. WARNING MESSAGES 88
- 6.4. CALIBRATION MODE 89
- 6.5. SETUP MODE 90
- INTERNAL CLOCK 95
- NALOG OUT 98
- 6.6.3. REPORTING RANGE MODES 99
- OF MEASURE 105
- FEATURE 106
- ADVANCED FEATURES 107
- 7.1.2. IDAS STRUCTURE 108
- RECORDS 111
- accepts the 126
- In all cases: 126
- discards the new 126
- FUNCTIONS 127
- OUTPUTS 129
- +DC Gnd 137
- CAUTION 139
- GENERAL SAFETY HAZARD 139
- GFC Wheel temperature 144
- 7.4.7. AIN CALIBRATION 146
- CONCENTRATION ALARMS 147
- REMOTE OPERATION 149
- Male DB-9 (RS-232) 150
- Female DB-9 (COM2) 150
- 8.1.3. COMM PORT BAUD RATE 151
- 8.1.5. COMM PORT TESTING 154
- 8.1.6. MACHINE ID 155
- 8.1.7.2. Command Syntax 157
- 8.1.7.3. Data Types 157
- 8.1.7.4. Status Reporting 158
- LED FUNCTION 164
- 8.5. MODBUS SETUP 171
- NETWORK 175
- CALIBRATION PROCEDURES 185
- 9.1. BEFORE CALIBRATION 186
- 9.1.2.2. Span Gas 187
- 9.1.2.3. Traceability 187
- CONFIGURATION 188
- INSTALLED 195
- Toggle keys to set 201
- Day, Month & Year: 201
- Format : DD-MON-YY 201
- Sequence Delta Time 203
- 9.5. CO CALIBRATION QUALITY 204
- Offset for CO REF signal 205
- Offset for CO MEAS signal 205
- 9.6.2. PRESSURE CALIBRATION 206
- 9.6.3. FLOW CALIBRATION 207
- 9.7.1. O 209
- 9.7.1.2. Set O 210
- Span Gas Concentration 210
- 9.7.1.3. Activate O 211
- Sensor Stability Function 211
- 9.7.1.4. O 212
- ZERO/SPAN CALIBRATION 212
- 9.7.2. CO 213
- 9.7.2.3. Activate CO 214
- 9.7.2.4. CO 215
- Zero/Span Calibration 215
- EPA CALIBRATION PROTOCOL 217
- 10.2. ZERO AND SPAN CHECKS 221
- 10.2.2. PRECISION CHECK 222
- 10.4. AUDITING PROCEDURE 223
- 10.5.1. LINEARITY TEST 224
- 10.6. REFERENCES 226
- PART III 227
- TECHNICAL INFORMATION 227
- THEORY OF OPERATION 229
- Measurement Cell 230
- Reference Cell 230
- CO MEAS 232
- 11.3. PNEUMATIC OPERATION 234
- 11.4. FLOW RATE CONTROL 235
- 11.4.2. PARTICULATE FILTER 236
- 11.4.3. PNEUMATIC SENSORS 236
- 11.5. ELECTRONIC OPERATION 237
- PC 104 Bus 238
- 11.5.3.2. IR Source 240
- 11.5.3.3. GFC Wheel 240
- Reference 241
- Measurement 241
- 11.5.3.4. IR Photo-Detector 242
- 11.5.4.1. Overview 242
- Detector 244
- 11.5.5. RELAY BOARD 245
- STATUS LED’s 246
- DC VOLTAGE TEST 246
- RELAY PCA 246
- PN 04135 246
- 11.5.6. MOTHERBOARD 247
- 11.5.6.4. Analog Outputs 248
- 11.5.10.2. Keyboard 252
- 11.5.10.3. Display 253
- 11.5.12. ADAPTIVE FILTER 256
- 11.5.11. SOFTWARE OPERATION 256
- 12.1. MAINTENANCE SCHEDULE 259
- AFTER WARM 262
- 12.3. MAINTENANCE PROCEDURES 264
- TROUBLESHOOTING & REPAIR 267
- (As Displayed) 271
- FUNCTION 273
- Motherboard 274
- P/N 04069 274
- D1 – M/R Sensor Status 275
- D2 – Segment Sensor Status 275
- JP4 Connector to Opto-Pickup 275
- 13.2. GAS FLOW PROBLEMS 278
- 13.2.2.1. Flow is Zero 282
- 13.2.2.2. Low Flow 282
- 13.2.2.3. High Flow 282
- 13.3. CALIBRATION PROBLEMS 283
- ELECTRICAL SHOCK HAZARD 285
- 13.4.2. EXCESSIVE NOISE 287
- 13.5. SUBSYSTEM CHECKOUT 288
- 13.5.3. I 289
- 13.5.5. RELAY BOARD 290
- 13.5.6. SENSOR ASSEMBLY 291
- 13.5.6.4. GFC Wheel Drive 292
- 13.5.6.5. IR Source 292
- (see Section 7.4.2) 294
- 13.5.7.4. Status Outputs 296
- 13.5.8. CPU 297
- 13.5.10. THE OPTIONAL CO 298
- SENSOR 298
- 13.6. REPAIR PROCEDURES 299
- SAFETY SHIELD 300
- SYNCHRONOUS MOTOR 300
- SOURCE ASSEMBLY 300
- THERMISTOR 300
- Opto-Pickup 301
- GFC WHEEL HOUSING 301
- GAIN (CO MEAS) 302
- Adjustment Made Here 303
- 13.7. TECHNICAL ASSISTANCE 304
- 14.4.1. GENERAL RULES 307
- MAINTENANCE 309
- Reporting Range, 52, 90 313
- Relay Board 317
- CANNOT DYN SPAN 319
- CANNOT DYN ZERO 319
- SYSTEM RESET 319
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