Agilent Technologies 7820A Manuale utente

A g i l e n t 7 8 2 0 A G a s

C h r o m a t o g r a p h

Service Manual

Agilent 7820 GC Service

Notices

No part of this manual may be reproduced in any form or by any

means (including electronic storage and retrieval or

translation into a foreign language) without prior agreement

and written consent from Agilent Technologies, Inc. as

governed by United States and international copyright laws.

Manual Part Number

G4350-90018

Edition

Third edition, August 2012

Printed in China

Agilent Technologies (Shanghai) Co., Ltd.

412 Ying Lun Road

Waigaoqiao Free Trade Zone

Shanghai 200131 P.R.China

Warranty

The material contained in this document is provided “as is, ”

and is subject to being changed, without notice, in future

editions. Further, to the maximum extent permitted by

applicable law, Agilent disclaims all warranties, either

express or implied, with regard to this manual and any

information contained herein, including but not limited to the

implied warranties of merchantability and fitness for a

particular purpose. Agilent shall not be liable for errors or

for incidental or consequential damages in connection with the

furnishing, use, or performance of this document or of any

information contained herein. Should Agilent and the user have

a separate written agreement with warranty terms covering the

material in this document that conflict with these terms, the

warranty terms in the separate agreement shall control.

Safety Notices

A warning calls attention to a condition or

possible situation that could cause injury to

the user.

Agilent 7820 GC Service

A caution calls attention to a condition or

possible situation that could damage or destroy the

product or the user's work.

Contents

Notices 2

1Before Servicing the Instrument 13

Safety ....................................... 14

Hand tools ................................... 14

Specialized tools ............................ 15

Electronic tools ............................. 17

Pneumatic tools .............................. 18

For Checking Inlet Pressure.................. 19

2Inlets 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

3Detectors 39

Detector overview ............................ 40

Agilent 7820 GC Service

About the detector signal boards............. 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

Agilent 7820 GC Service

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

4EPC modules 125

EPC overview ................................ 126

Repairing EPC modules....................... 126

Accessing EPC modules....................... 127

Replacing the EPC modules................... 128

Replacing EPC module proportional valves.... 129

5Performance 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

6Configuration 157

Configuration overview ...................... 158

Inlet example ............................ 159

Detector example ......................... 159

PCM example .............................. 160

Heater assignments ....................... 161

Agilent 7820 GC Service

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

7External 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

8Internal Cabling 181

Internal cabling overview................... 182

Ignitor cable, FID .......................... 182

NPD power cable ............................. 183

AC power inlet assemblies ................... 184

Agilent 7820 GC Service

Motor Harness & AC Control Assembly......... 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

9Mainframe 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 coil . 204

Replacing the oven shroud, oven fan, and oven fan

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

Agilent 7820 GC Service

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 700

.......................................... 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 800

.......................................... 249

Gas Sampling with Backflush of Precolumn to Vent,

Option 801 ............................... 250

Gas Sampling with Backflush to Detector, Option

802....................................... 250

Gas Sampling with Sequence Reverse and Backflush

of Column 1, Option 805 .................. 251

Troubleshooting ............................. 252

Agilent 7820 GC Service

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

Agilent 7820 GC Service

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 Breakdown297

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

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