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6890N
Agilent Technologies 6890N User Manual
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92
Troubleshooting
8
Troubleshooting Tasks
T
o Perform the GC Self-
T
est
1
Tu
rn
the
GC
o
ff
.
2
W
ait 1 m
in, then turn the GC back on
. If the main GC
status
screen
appears
, the GC
has passed t
he se
lf-test.
91
93
Table of Contents
Default Chapter
3
Table of Contents
3
1 Concepts and General Tasks
7
Agilent Technologies
7
Concepts
8
How to Troubleshoot Using this Manual
8
The [Status] Key
8
Configurable Items to Always Keep Current
9
Column Configuration
9
Automatic Liquid Sampler Configuration
9
Gas Configuration
9
Information to Obtain before Calling Agilent for Service
10
2 Hardware Symptoms
11
Plunger Errors
12
Vial Mishandled by als
13
Syringe Needle Bends During Injection into Inlet
14
FID Does Not Ignite
15
FID Ignitor Does Not Glow During Ignition Sequence
16
Corrosion in FID Collector and Ignitor Glow Plug
17
FPD Does Not Ignite
18
NPD Adjust Offset Process Fails
19
3 Chromatographic Symptoms
21
Retention Times Not Repeatable
22
Peak Areas Not Repeatable
23
Contamination or Carryover
24
Isolate the Source
24
Check Possible Causes-All Inlet and Detector Combinations
24
Larger Peaks than Expected
25
Peaks Not Displayed/No Peaks
26
Baseline Rise During Oven Temperature Program
27
Poor Peak Resolution
28
Peak Tailing
29
Npd
29
Peak Boiling Point or Molecular Weight Discrimination Poor
30
For any Inlet Operating in Split Mode with any Detector
30
For any Inlet Operating in Splitless Mode with any Detector
30
Sample Decomposition in Inlet/Missing Peaks
31
Peak Fronting
32
Noisy Detector, Including Wander, Drift, and Baseline Spikes
33
Noisy Baseline
33
Baseline Wander and Drift
34
Baseline Spiking
34
Figure 1. Cyclic Spiking
35
Check for the Correct Jet. Low Peak Area or Height
36
FID Flame Goes out During a Run and Attempts to Reignite
38
FID Baseline Output above 20 Pa
39
FPD Flame Goes out During a Run and Attempts to Reignite
40
FPD Output too High or too Low
41
FPD Low Peak Areas
42
FPD Large Peak Width at Half-Height
43
FPD Baseline Output High, > 20 Pa
44
NPD Solvent Quenching
45
NPD Response Low
46
NPD Baseline Output > 8 Million
47
NPD Adjust Offset Process Not Functioning Properly
48
NPD Low Selectivity
49
Negative Peaks Seen with TCD
50
TCD Baseline Has Dampened Sinusoidal Noise Trailing Peaks (Ringing Baseline)
51
TCD Peaks Have Negative Dip on Tail
52
4 GC Not Ready Symptoms
53
GC Never Becomes Ready
54
Flow Never Becomes Ready
55
Oven Temperature Never Cools Down/Cools very Slowly
56
Oven Never Heats up
57
Temperature Never Becomes Ready
58
Cannot Set a Flow or Pressure
59
A Gas Does Not Reach Setpoint Pressure or Flow
60
A Gas Exceeds Pressure Setpoint or Flow
61
The Inlet Pressure or Flow Fluctuates
62
Cannot Maintain a Pressure as Low as the Setpoint on a Split Inlet
63
The Measured Column Flow Does Not Equal the Displayed Flow
64
FID Does Not Ignite
65
FID Ignitor Does Not Glow During Injection Sequence
66
NPD Adjust Offset Process Fails
67
FPD Does Not Ignite
68
5 Shutdown Symptoms
69
Column Shutdown
70
Hydrogen Shutdown
71
Thermal Shutdowns
72
6 Nonfunctional GC Symptoms
73
GC Does Not Turn on
74
PC Cannot Communicate with GC
75
7 Checking for Leaks
78
Leak Check Tips
78
To Check for External Leaks
79
To Check for GC Leaks
81
Leaks in Capillary Flow (Microfluidic) Fittings
82
8 Troubleshooting Tasks
83
To Measure a Column Flow
84
Measuring FID, TCD, Uecd, and FPD Column Flow
84
Measuring NPD Column Flow
85
To Measure a Split Vent or Septum Purge Flow
87
To Measure a Detector Flow
89
Measuring FID, TCD, Uecd, and FPD Flows
89
Measuring NPD Flows
90
To Perform the GC Self-Test
92
To Adjust the FID Lit Offset
93
To Verify that the FID Flame Is Lit
94
To Verify FID Ignitor Function During Ignition Sequence
95
To Measure FID Leakage Current
96
To Measure FID Baseline Output
97
To Measure NPD Leakage Current
98
To Verify that the NPD Bead Is Ignited
99
To Verify that the FPD Flame Is Lit
100
To Adjust the FPD Lit Offset
101
5
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Agilent Technologies 6890N Specifications
General
Brand
Agilent Technologies
Model
6890N
Category
Laboratory Equipment
Language
English
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