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7820A
Agilent Technologies 7820A Service Manual
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A
g
i
l
e
n
t
7
8
2
0
GC
S
er
vi
c
e
107
Place the housi
ng onto the coupling and
fasten the top screw
just
tight enough to
keep the parts
together.
Hold the y-shaped
clamp and start the
remaining screws into the
clamp. Do not ti
ghten until
step 7 of
Reassembling the detec
tor
(
108
).
106
108
Table of Contents
Notices
2
Table of Contents
3
1 Before Servicing the Instrument
13
Safety
14
Hand Tools
14
Specialized Tools
15
Electronic Tools
17
Pneumatic Tools
18
For Checking Inlet Pressure
19
2 Inlets
23
Inlet Overview
24
Split/Splitless Inlet
24
Replacing the Split/Splitless Inlet
24
Replacing the Split/Splitless Inlet Top Weldment Assembly
26
Replacing the Split/Splitless Inlet Split Vent Line
27
Replacing the Split/Splitless Inlet Split Vent Filter Canister and Valve Assembly
28
Reinstalling the Split/Splitless Inlet
29
Purged Packed Inlet
31
Replacing the Purged Packed Inlet
31
Replacing the Purged Packed Inlet Heater
35
3 Detectors
39
About the Detector Signal Boards
40
Detector Overview
40
Accessing Detector Signal Boards
41
Replacing Detector Signal Boards
41
Flame Ionization Detector (FID)
44
Selecting an FID Jet
44
Replacing the FID Interconnect Assembly or Spring
46
Replacing the Heater
48
Replacing the FID Signal Board
53
Replacing the Electrometer
54
Replacing the Glow Plug (Ignitor)
55
Replacing the Entire FID
57
Ultrasonic Cleaning the FID
62
Nitrogen Phosphorus Detector (NPD)
65
Selecting an NPD Jet
65
Removing the NPD Electrometer
66
Replacing the Entire NPD
67
Replacing an NPD Signal Board
70
Replacing the NPD Heater
72
Replacing the NPD Electrometer
74
Cleaning the NPD Jet and Collector
76
Cleaning the NPD
78
Thermal Conductivity Detector (TCD)
81
Replacing the TCD Detector Cell
81
Replacing the TCD Switching Valve
83
Micro-Cell Electron Capture Detector (Uecd)
85
Replacing the Uecd Heater/Sensor Assembly
85
Replacing the Uecd Makeup Gas Adapter
86
Frequency Test
87
Leak Test
89
Performing a Radioactivity Leak Test (Wipe Test)
89
Flame Photometric Detector (FPD)
91
Preparing for Maintenance
91
Disassembling the FPD
91
Rebuilding the FPD Optics Assembly
101
Reassembling the FPD
108
Replacing the FPD
117
Bake out and Run Checkout Test
119
Replacing the Heater/Sensor Assemblies
119
Replacing the FPD Signal Board
123
4 EPC Modules
125
EPC Overview
126
Repairing EPC Modules
126
Accessing EPC Modules
127
Replacing the EPC Modules
128
Replacing EPC Module Proportional Valves
129
5 Performance Verification
131
About Chromatographic Checkout
131
To Prepare for Chromatographic Checkout
132
To Check FID Performance
132
Typical Values
136
To Check NPD Performance
136
Typical Values
140
To Check TCD Performance
140
To Check Uecd Performance
145
Typical Values
149
To Check FPD Performance (Sample 5188-5953)
150
6 Configuration
157
Configuration Overview
158
Inlet Example
159
Detector Example
159
PCM Example
160
Heater Assignments
161
GC Modules and the Communications Buss
163
To Configure an MSD Transfer Line
165
To Configure a Valve Box
166
Replacing a GC Module
166
Removing a GC Module
167
Changing the GC Configuration
167
Configuration Locks
168
Installing New Devices
169
Configuring Time
170
7 External Cabling
171
Connectors on the Back of the GC
172
Remote Start/Stop
172
APG Remote Control
172
Cable Pinouts, Remote Start/Stop, General Use
176
Cable Pinouts, GC to 3395B/3396C Integrator
177
Automatic Sampler for GC
177
Analog Signal Outputs
178
Analog Cable: GC to 3395A/B or 3396B/C Integrators and 35900 C/D/E Analog to Digital Interface Instrument
178
Analog Cable: General Use
179
8 Internal Cabling
181
Internal Cabling Overview
182
Ignitor Cable, FID
182
NPD Power Cable
183
Motor Harness & AC Control Assembly
184
AC Power Inlet Assemblies
184
Inlet/Detector Heater Harness
187
Aux Heater/Valve Box Harness
188
Communications Harness
188
7820 GC/MS Second Inlet Upgrade Harness
191
Keyboard Display Cable
192
Display Cable Assembly
192
9 Mainframe
193
Mainframe Overview
194
Covers and Fans
194
Removing and Replacing the Covers
194
Replacing the Oven Bezel
196
Replacing the Inlet Cooling Fan
196
Replacing the EPC Cooling Fan
197
Replacing the Oven Door
199
Oven Temperature Control
200
Oven Temperature Troubleshooting
200
Measuring Inlet and Detector Heater and PRT Resistance
201
Testing Resistance of the Oven Heater Coil203
204
Replacing the Oven Shroud, Oven Fan, and Oven Fan Motor
205
Replacing the Oven Shroud, Oven Fan, and Oven Fan
205
Motor
205
Replacing the Oven Flapper Assembly
208
Replacing Components Inside the Electronics Panel
209
Accessing the Analog and Power Board
209
Replacing the als Board
209
Replacing the Fuse on the als Controller Board
212
Removing the Valve Bracket
214
Replacing the Logic Board
216
Replacing the Analog and Power Board
220
Replacing Components Inside the Lower Rear Metal Cover
223
Replacing the AC Board
223
Replacing the Oven Triac
224
Replacing the Power Transformer
226
10 Valves
229
Valves
230
Introduction
230
Valco W-Series Minivalves
231
Gas Sample Valves
233
Valve Box
234
Installing the Valve Box
234
Removing the Valve Box Assembly
238
Actuators
240
Installing the Actuators
240
Valve Actuator Drivers
242
Replacing a Solenoid Valve (New Style)
242
Valve Actuator Alignment
246
Typical Valve Configurations
247
Custom Plumbing (Diagram Required), Option
247
Gas Sampling Option, Option 701 or 751
248
Column Isolation, Option 702 or 752
248
Two Stream Selection (Requires Gas Sampling), Option 703 or 753
249
Custom Plumbing (Diagram Required), Option
249
Gas Sampling with Backflush of Precolumn to Vent, Option 801
250
Gas Sampling with Backflush to Detector, Option
250
Gas Sampling with Sequence Reverse and Backflush of Column 1, Option 805
251
Troubleshooting
252
Chromatographic Symptoms
252
Loss of Sensitivity or Excessive Drift
253
Loss of Peaks in Specific Areas of the Chromatogram
253
Extraneous Peaks
253
Peak Broadening and Tailing
254
Baseline Shifts
254
Baseline Upsets
254
Variation in Peak Area and Retention Time
255
Pressure Check
255
11 Electrical
257
Power Options
258
Converting the Power Option
259
Remote Start/Stop Connection
261
Remote Control
262
Temperature Sensor Resistance
263
Ceramic and Glass Fuses
263
AC Power Board Schematic
264
Oven Shroud
265
12 Firmware
267
Firmware Overview
268
Confirm Firmware Update
268
To Update GC Firmware
269
To Update Frit Constants
271
13 Service Mode Diagnostics
275
Service Mode Overview
276
Detector Diagnostics
276
Signal Board Diagnostics
277
Multiplexed ADC
279
Pneumatics
280
Power Diagnostics
281
14 Printed Circuit Boards
283
AC Power Board
285
Analog and Power Board
287
Logic and Communications Board
288
Keyboard Interconnect Board
288
FID Signal Board
290
TCD Signal Board
291
Uecd Signal Board
292
NPD Signal Board
292
FID Electrometer Board
293
Uecd Electrometer Board
294
NPD Electrometer Board
294
FPD Signal Board
296
15 Illustrated Parts Breakdown
297
Overview of the IPB
297
Inlets
298
Split/Splitless Inlet (SSL)
299
Split/Splitless Inlet
300
SSL Split Vent Trap (7820)
301
Split Splitless Inlet Body
302
Split Splitless Inlet Warmer
304
Consumables and Parts for the Split/Splitless Inlet
305
Purged Packed Inlet (PP)
307
Purged Packed Inlet Upper Body
308
Purged Packed Inlet
310
Consumables and Parts for the Purged Packed Inlet
312
Detectors
316
Flame Ionization Detector (FID)
317
FID Body
319
FID Collector Assembly
321
FID Base Assembly
322
Consumables for the FID
324
Thermal Conductivity Detector (TCD)
325
Thermal Conductivity Detector (TCD)
327
Consumables for the TCD
330
Microcell Electron Capture Detector (Uecd)
331
Microcell Electron Capture Detector (Uecd)
333
Consumables for the Uecd
338
Nitrogen Phosphorus Detector (NPD)
340
Nitrogen Phosphorus Detector (NPD)
342
Consumables for the NPD
345
Flame Photometric Detector (FPD)
348
FPD Inert Transfer Line Parts
350
FPD Ignitor and Heat Shield Assembly
352
PMT and Bracket Assemblies
353
FPD Lens Assembly
354
FPD Covers
355
Consumables for the FPD
356
EPC Modules
358
Nickel Catalyst Accessory
366
Covers
369
Mainframe
371
Automatic Liquid Sampler Parts
372
Oven
374
Oven Assembly
374
Oven Flapper Assembly
376
Valves
378
Valve Box Assembly
378
Valve Driver Assembly
380
Valve Actuator Assembly (1 of 2)
382
Valve Actuator Assembly (2 of 2)
383
Valco W-Series Minivalve
384
Electrical
387
Electronics Carrier
387
Display and Keyboard
389
AC Power Components
390
AC Circuit Board Components
393
AC Power Kits
394
Main Transformer
395
Power Cords
396
Chassis Fans
397
Other manuals for Agilent Technologies 7820A
Manual
294 pages
Advanced User's Guide
130 pages
Operating Guide
66 pages
Safety Manual
18 pages
Installation Guide
44 pages
Quick Start Guide
30 pages
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Agilent Technologies 7820A Specifications
General
Brand
Agilent Technologies
Model
7820A
Category
Laboratory Equipment
Language
English
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