Table of Contents
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Introduction
Conditions
Table 9–1. Diagnosing alarm conditions
Device
Electron Energy
Emission
Filament Current
Filament Current Limit
Filament Integrity
Half Plate 1 Output
Voltage
Half Plate 2 Output
Voltage
In Current Limit
Ion Energy
Repeller Voltage
Source Current
Source Temperature
Trap Current
Thermo Fisher Scientific
Chapter 9
Fault Diagnosis
This chapter provides information on basic fault diagnosis that
should only be undertaken by an experienced technician trained in
the maintenance of high voltage electronic equipment. The
information provided is not exhaustive, and normal diagnostic
procedures should be followed where specific details are not given.
Alarm
The status of the instrument is indicated in GasWorks software by
the status window display. Any out of limit condition for any
parameter is indicated by an alarm condition (normally indicated in
red). Typical values, limits, and causes of alarm conditions are
indicated in the table below.
Typical
Reading
70.10 volts
1
2.60 amps
3.06 amps
(OK)
448.0 volts
431.0 volts
(OK)
998.0 volts
6.96 volts
85.0
µamps
140.1°C
29.9
µamps
Set Point
Set Point
Low
High
30.00 volts
95.00 volts
0.5
1.5
1.50 amps
3.50 amps
300.0 volts
950.0 volts
300.0 volts
950.0 volts
(OK)
750.0 volts
1050.0
volts
-10.00
10.00 volts
volts
1000.0
µamps
138.0°C
142.0°C
10.0
100.0
µamps
µamps
Prima PRO & Sentinel PRO Mass Spectrometers User Guide
Typical Cause
ASU failure
Power parameters in
alarm
Still pumping down or
filament failure
ASU failure
ASU failure
Ion source fault
ASU failure
ASU failure
Faulty filament
Still warming up or
source heater failure
Filament failure
9-1
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