Agilent Technologies 5975C TAD VL MSD Troubleshooting And Maintenance Manual page 274

Index
mass (axis) offset, 210
parameters, 208
radiator, 213
RF voltage, 208
Mass gain, 210
Mass offset, 210
Mass spectra
high abundances at m/z 18, 28, 32, and
44 or at m/z 14 and 16,
high background, 38
inconsistent peak widths,
incorrect mass assignments,
isotopes missing or ratios are
incorrect, 38
precursors, 39
Mass-to-charge ratio, 208
Methane/isobutane gas purifier
replacing, 167
Micro-ion vacuum gauge
ignition of hydrogen by, 195
reinstalling, 117
removing, 116
Mist filter, for foreline exhaust,
Moving the MSD, 94
MS error numbers, 47
MSD
dangerous voltages in, 85
dangerously hot parts in the,
does not turn on, 31
electronics, 215 to 229
hazards from chemical residue,
interfacing to external devices,
maintaining, 83 to ??
moving or storing, 94
troubleshooting, 29 to 54
N
NH3, preventing damage to the foreline
pump due to, 166
No peaks in CI MSD, 69
O
Oil drip tray, for foreline pump,
Oil trap, 176
Oil tray, for foreline pump, 176
On/off switch. See Power switch
Ordering parts, 232
274
O-rings and O-ring assemblies,
P
Parts, 231
analyzer,
consumables,
electronic,
39 if you cannot find a part you need,
ordering,
39 rebuilt assemblies,
39 vacuum system,
Parts, replacement,
Peak widths, inconsistent,
Peaks
at m/z 18, 28, 32, and 44 or at m/z 14
and 16,
flat tops,
fronting,
inconsistent widths,
missing, 33,
precursors,
176 split tops,
tailing,
PFDTD
not visible, but reagent ions are
present,
86 PFDTD
(perfluoro-5,8-dimethyl-3,6,9-trioxidod
ecane),
86 PFTBA (perfluorotributylamine),
228 Physical description of MSD,
Polarity (dc), of the mass filter,
Power cord
ac, 225
foreline pump,
receptacle,
Power supplies
high voltage (HED),
low voltage (ac-dc),
Power switch,
Pressure
analyzer chamber pressure too high,
analyzer chamber pressure too low,
176 CI ion source,
does not change when reagent gas flow
is changed,
foreline pressure too high,
foreline pressure too low,
182
250
260
233
232
232
232
240
231
39
39
34
34
39
49
39
35
34
73
192
192
13
210
225
225
224
224
217
202
67
42
43
5975 Series MSD Troubleshooting and Maintenance Manual
Ion source, for CI,
symptoms indicating malfunctions,
too high in analyzer chamber with
reagent gas flow,
too high in analyzer chamber without
reagent gas flow,
Procedure, 166
Pump
exhaust, venting,
Pump oil drip tray, 176
Pump, foreline
failure to turn on,
turned off during pumpdown,
Pumpdown
failure, 222
safety shutdown,
Pumpdown safety shutdown,
Pumping problem, 222
Pumps turned off, 174,
Q
Quadrupole. See Mass filter
R
Radiators, 213
Reagent gas
cleaning supply tubing,
Reagent gas ions
not visible, 71
Relative abundance,
Remote start connector, 225,
Repeatability, poor, 37
Repeller, CI, 202
S
Safety
covers, 85
during maintenance,
Seals
42 vacuum, 182
See also O-rings and O-ring assemblies
43
Sensitivity
poor, 37
poor at high masses,
Septum bleed, as a source of
contamination,
16
42
66
65
86
32
32
174
222
222
168
40
228
85 to 87
41
54