Teledyne 2120 - Trace Nitrogen in Argon Analyzer - Manual (Page 50)

Maintenance Model 2120
Defective PMT. Check and replace if faulty.
Defective amplifier board. Check and replace if faulty.
Defective high-voltage
PMT socket. Check and replace if faulty.
Defective low-voltage
DC power supply. Check and replace power
supply if faulty.
Sample line leakage,
improper sampling, etc. Check sample lines for
leak If a leak is found, re-
purge sample lines.
Recorder off scale (top or
bottom) - continued
Defective ZERO or
SPAN potentiometer. Check and replace if faulty.
Analyzer not warmed up. If analyzer recently started
up, wait for warm-up.
Sample line leakage. Check sample lines for
leak. if a leak is found, re-
purge sample lines.
Analyzer or sampling
system not fully purged. Purge analyzer and
sampling system 12 or
more hours or overnight.
Flow not stable. Check for flow obstructions
or faulty low-flow switch.
Weak signal. Check amplifier board and
replace if defective.
Defective recorder. Check recorder per
supplier manual.
Recorder drift
Increase in pressure in
analytical cell. Check for obstructions in
sample flow meter, low
flow switch, or analyzer
tubing (such as water in
vent line).
Re-purge the system if an
obstruction is found.
Recorder oscillates and
readings are erratic. Improper plate voltage
on PMT. Check and replace if faulty.
Check calibration data
supplied with analyzer.
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Teledyne Analytical Instruments