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7890A
Agilent Technologies 7890A Troubleshooting
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Chromatographic Symptoms
3
Agilent 7890 Series Troubleshooting
87
TCD Baseline Has Dampened Sinusoidal Noise T
railing Peaks (Ringing
Baseline)
W
rong
data r
ate i
s sel
ected
in the
data s
ystem
. F
or
TC
D, the
dat
a rate should be
5 Hz.
86
88
Table of Contents
Default Chapter
3
Table of Contents
3
1 Concepts and General Tasks
10
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
17
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
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
41
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
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
89
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
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
112
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
122
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
7 Checking for Leaks
127
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
8 Troubleshooting Tasks
174
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
Other manuals for Agilent Technologies 7890A
Operating Guide
84 pages
Instruction Guide
18 pages
Safety Manual
20 pages
Quick Reference
34 pages
4
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Agilent Technologies 7890A Specifications
General
Brand
Agilent Technologies
Model
7890A
Category
Laboratory Equipment
Language
English
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