Agilent Technologies 7890 Series Instrucciones de funcionamiento

Agilent Technologies

Agilent 7890 Series

Gas Chromatograph

Troubleshooting

Notices

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international copyright laws.

Manual Part Number

G3430-90053

Edition

Third edition, October 2015

Second edition, December 2013

First edition, January 2013

Printed in USA

Agilent Technologies, Inc.

2850 Centerville Road 

Wilmington, DE 19808-1610 USA

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is provided “as is,” and is subject to

being changed, without notice, in future

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permitted by applicable law, Agilent

disclaims all warranties, either express

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Safety Notices

CAUTION

A CAUTION notice denotes a hazard. It

calls attention to an operating

procedure, practice, or the like that, if

not correctly performed or adhered to,

could result in damage to the product

or loss of important data. Do not

proceed beyond a CAUTION notice

until the indicated conditions are fully

understood and met.

WARNING

A WARNING notice denotes a hazard.

It calls attention to an operating

procedure, practice, or the like that, if

not correctly performed or adhered

to, could result in personal injury or

death. Do not proceed beyond a

WARNING notice until the indicated

conditions are fully understood and

met.

Agilent 7890 Series Troubleshooting 3

Contents

1 Concepts and General Tasks

Concepts 10

How to troubleshoot using this manual 10

The [Status] key 10

Error conditions 11

Systems Configured for Enhanced Communications 12

Configurable Items to Always Keep Current 13

Inlet and detector configuration 13

Column configuration 13

Automatic Liquid Sampler configuration 14

Gas configuration 14

To View the Run Log, Maintenance Log, and Event Log 15

Run Log 15

Maintenance Log 15

Event Log 15

Information to Obtain Before Calling Agilent for Service 16

2 ALS and Detector Symptoms

Plunger Errors 18

Procedure 18

Vial Mishandled by ALS (7693A) 19

Alignment Light on 7693A/7650A Injector Tower is On 21

Vial Mishandled by ALS (7683) 22

Alignment Light on 7683B Injector Tower is On 24

Syringe Needle Bends During Injection into Inlet 25

FID Fails Leakage Current Test 26

Possible causes 26

Procedure 26

NPD Fails Leakage Current Test 27

FID Fails Baseline Test 28

To Resolve Low Sensitivity with an FID 29

FID Does Not Ignite 30

FID Ignitor Does Not Glow During Ignition Sequence 31

4Agilent 7890 Series Troubleshooting

Corrosion in FID Collector and Ignitor Glow Plug 33

FPD Does Not Ignite 34

NPD Adjust Offset Process Fails 36

NPD Bead Will Not Ignite 37

FPD+Temperature Will Not Become Ready 38

Blinking Not Ready Light: Detector Hardware Fault/TCD Filament

Voltage 39

Shutdown (Defective) Device 40

3 Chromatographic Symptoms

Retention Times Not Repeatable 42

Peak Areas Not Repeatable 43

Contamination or Carryover 44

Isolate the source 44

Check possible causes—all inlet and detector combinations 44

Larger Peaks Than Expected 47

Peaks Not Displayed/No Peaks 48

Baseline Rise During Oven Temperature Program 50

Poor Peak Resolution 51

Peak Tailing 52

NPD Peak Tailing 53

Peak Boiling Point or Molecular Weight Discrimination Poor 54

For any inlet operating in split mode with any detector 54

For any inlet operating in splitless mode with any detector 54

Sample Decomposition in Inlet/Missing Peaks 55

Peak Fronting 56

Noisy Detector, Including Wander, Drift, and Baseline Spikes 57

Noisy baseline 57

Baseline wander and drift 59

Baseline spiking 60

Microcell Electron Capture Detector (uECD) Noise and Sensitivity 63

Display signal evaluation 63

Sensitivity 65

Contamination (high baseline) 66

Agilent 7890 Series Troubleshooting 5

Low Peak Area or Height (Low Sensitivity) 67

To Resolve Low Sensitivity with an FID 68

FID Flame Goes Out During a Run and Attempts to Reignite 70

FID Baseline Output Above 20 pA 72

FID Baseline Output at Maximum (~8 Million) 73

FPD Flame Goes Out During a Run and Attempts to Reignite 74

FPD Quenching/Repeatability 75

FPD Output Too High or Too Low 76

FPD Low Peak Areas 77

FPD Large Peak Width at Half-Height 78

FPD Baseline Output High, > 20 pA 79

NPD Solvent Quenching 80

NPD Response Low 81

NPD Baseline Output > 8 million 83

NPD Adjust Offset Process Not Functioning Properly 84

NPD Low Selectivity 85

Negative Peaks Seen with TCD 86

TCD Baseline Has Dampened Sinusoidal Noise Trailing Peaks (Ringing

Baseline) 87

TCD Peaks Have Negative Dip on Tail 88

4 GC Not Ready Symptoms

GC Never Becomes Ready 90

Flow Never Becomes Ready 91

Oven Temperature Never Cools Down/Cools Very Slowly 92

Oven Never Heats Up 93

Temperature Never Becomes Ready 94

Cannot Set a Flow or Pressure 95

A Gas Does Not Reach Setpoint Pressure or Flow 96

A Gas Exceeds Pressure Setpoint or Flow 97

The Inlet Pressure or Flow Fluctuates 98

Cannot Maintain a Pressure as Low as the Setpoint on a Split Inlet 99

6Agilent 7890 Series Troubleshooting

The Measured Column Flow Does Not Equal the Displayed Flow 100

FID Does Not Ignite 101

FID Ignitor Does Not Glow During Injection Sequence 102

FID or NPD Measured Hydrogen and Makeup Gas Flows Much Less Than

Setpoint 104

NPD Adjust Offset Process Fails 105

FPD Does Not Ignite 106

Valve Not Ready 108

External valves 108

Gas sampling valves 108

Multiposition valve 108

Blinking Not Ready Light: Detector Hardware Fault/TCD Filament

Voltage 109

5 Shutdown Symptoms

Column Shutdowns 112

Hydrogen Shutdowns 114

Hydrogen used in inlets and auxiliary gas streams 114

Hydrogen sensor 115

Detector Air Shutdowns 116

7890B MS Shutdown 117

Clearing an MS Shutdown 118

After resolving an MS Shutdown 118

Thermal Shutdowns 119

6 GC Power On and Communication Symptoms

GC Does Not Turn On 122

PC Cannot Communicate with GC 123

GC Cannot Communicate with a Configured MS or HS 124

GC Does Not Recover After Firmware Update 125

GC Turns On, Then Stops During Startup (During Self-Test) 126

Agilent 7890 Series Troubleshooting 7

7 Checking for Leaks

Leak Check Tips 128

To Check for External Leaks 129

To Check for GC Leaks 131

Leaks in Capillary Flow Fittings 132

To Perform an Inlet Leak Check 133

To set warning limits for a leak check 135

To disable a warning limit for the inlet leak check 135

To Check for Leaks in a Split/Splitless Inlet 136

Cannot Reach Pressure Setpoint 136

Low Sensitivity or Poor Repeatability 137

To Perform a SS Pressure Decay Leak Test 138

To perform a SS inlet pressure decay test at the GC keyboard 138

To Correct Leaks in the Split Splitless Inlet 143

To Check for Leaks in a Multimode Inlet 144

Cannot Reach Pressure Setpoint 144

Low Sensitivity or Poor Repeatability 145

To Perform a MMI Pressure Decay Test 146

To Perform a Multimode Inlet Pressure Decay Test 146

To Correct Leaks in the Multimode Inlet 150

To Perform a PP Pressure Decay Leak Test 151

To Perform a PP Inlet Pressure Decay Test 151

To Correct Leaks in the Packed Column Inlet 155

To Perform a COC Pressure Decay Leak Test 156

To Perform a COC Pressure Decay Test 156

To Correct Leaks in the Cool On-Column Inlet 160

To Perform a PTV Pressure Decay Test 161

To Correct Leaks in the PTV Inlet 165

To Perform a VI Pressure Decay Test 166

To Prepare the VI for a Closed System Leak Check 170

To Correct Leaks in the Volatiles Interface 171

8Agilent 7890 Series Troubleshooting

8 Troubleshooting Tasks

To Measure a Column Flow 174

Measuring FID, TCD, uECD, and FPD column flow 174

Measuring NPD column flow 176

To Measure a Split Vent or Septum Purge Flow 178

To Measure a Detector Flow 180

Measuring FID, TCD, uECD, and FPD flows 180

Measuring NPD flows 183

To Perform the GC Self-Test 185

To Check or Monitor Split Vent Line Backpressure 186

To set a warning limit for the inlet trap check 186

To disable a warning limit for the inlet trap check 188

To Run the Inlet Trap Check 189

To Perform a SS Split Vent Restriction Test 191

To Check a Split Vent Line for Contamination 192

To Adjust the FID Lit Offset 194

To Verify That the FID Flame Is Lit 195

To Verify FID Ignitor Function During Ignition Sequence 196

To Measure FID Leakage Current 197

To Measure FID Baseline Output 198

To Isolate the Cause of FID Noise 199

To Measure NPD Leakage Current 200

To Check for a Plugged FID Jet 201

To Check for a Plugged NPD Jet 202

To Verify That the NPD Bead Is Ignited 203

To Verify That the FPD Flame Is Lit 204

To Adjust the FPD Lit Offset 205

When to Change Gas Purifiers 206

To Ignore a Device’s Readiness State 207

To Use the Stopwatch 208

Agilent 7890 Series Gas Chromatograph

Troubleshooting

Agilent Technologies

Concepts and General Tasks

Concepts 10

Systems Configured for Enhanced Communications 12

Configurable Items to Always Keep Current 13

To View the Run Log, Maintenance Log, and Event Log 15

Information to Obtain Before Calling Agilent for Service 16

10 Agilent 7890 Series Troubleshooting

1Concepts and General Tasks

Concepts

This manual provides lists of symptoms and corresponding

tasks to perform should you experience errors associated with

GC hardware or chromatographic output, GC Not Ready

messages, and other common issues.

Each section describes a problem and provides a bulleted list of

possible causes for you to troubleshoot. These lists are not

intended for use in the development of new methods. Proceed

with troubleshooting under the assumption that method(s) are

working properly.

This manual also includes common troubleshooting tasks as

well as information needed prior to calling Agilent for service.

While this manual describes troubleshooting for 7890 Series

GCs in general, when describing GC keyboard usage and

firmware features, this manual assumes a 7890B GC using

firmware B.02.01. Features that are specific to one GC model

only (7890A or 7890B) are noted.

How to troubleshoot using this manual

Use the following steps as a general approach to

troubleshooting:

1Observe the symptoms of the problem.

2Look up the symptoms in this manual using the Table of

Contents or the Search tool. Review the list of possible causes

of the symptom.

3Check each possible cause or perform a test that narrows the

list of possible causes until the symptom is resolved.

The [Status] key

Be sure to also use the [Status] and [Info] keys on the GC keypad

while using this troubleshooting information. These keys will

display additional useful information related to the status of the

GC and its components.

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