Troubleshooting - Operation Contamination
KJLC 354 Ion Gauge
Part Number: KJLC354401xx
Issue
Possible Cause
Possible Solution
Clear ERROR message
1. Must be done before the
ion gauge can be turned
on after receiving an
ERROR message
1. SETUP UNIT --> CLR IG ERROR (if using the FRONT
PANEL CONTROL)
Display is off / blank
1. No power
2. The connector may not
be wired correctly
1. Check cable connections
2. Check cable connections
1. Page 12 of manual for the analog pin-out
2. Page 13 of manual for the RS485 pin-out
Readings are very different
from expected pressure
1. Sensor not installed in the
proper location
2. The process gas is
different from the gas
used to calibrate the
gauge (nitrogen)
3. Sensor has been dropped
4. Gauge sensor is
contaminated
5. Leak in the vacuum
system
1. Ensure sensor is located in the right place (page 10 of
manual)
2. Apply gas sensitivity correction factor if applicable or
select the appropriate gas from the 354 display menu
(page 29 of manual)
1. Front Panel Control - SETUP UNIT --> GAS TYPE
3. Ion gauge sensor is possibly contaminated.
1. Go into R&D Mode
1. MENU --> SETUP DISP --> MODE and select
RESEARCH. After going to top of menu, it
should display several things including FVI.
The first digits are filament voltage, the
second digits are current.
i.
If voltage > 1.7 V and current is > 2.5 A
at 100 uA setting, there is possible
contamination
ii.
If voltage > 2.3 V and current is > 2.7 A
at 4 mA setting, there is possible
contamination.
2. Degas sensor if values exceed limits from point 3
1. Degassing basic information, page 16 of
manual
2. Front Panel Control --> DEGAS ON
3. RS-485 - page 32 of manual
3. Re-check R&D Mode Values. If nothing changed,
sensor is contaminated.
4. Contact [email protected] with R&D values
1. Possibly need to replace the sensor
4. Re-check for a leak in the system; metal seals should be
used when operating below 1x10-7 Torr
