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7. 631-X TROUBLESHOOTING
Symptom Possible Cause Solution
Power Problems
Unit does not turn ON. Unit
turns on when power cord is
plugged in. LCD displays 000
when instrument is operating on
AC power.
Discharged battery or
Dead battery.
Recharge battery for a minimum of
14 hours. Refer to page 17.
Replace battery. Refer to page 21.
Unit does not turn on when
connected to AC power cord.
Open fuse.
Insufficient power.
Internal component failure.
Replace fuse. Refer to page 22.
Use a voltmeter to verify there is
power to the AC outlet.
Call AZI Customer Service for
information at 800-528-7411 or
602-470-1414.
Regeneration & Zero Problems
LCD displays .8.8.8. Sensor saturated. Do not attempt to adjust zero pot.
The sensor must be regenerated.
Refer to page 12 for information.
LCD displays .L.L.L when
taking first sample.
Changes in temperature. Readjust zero pot. See page 13 for
information.
LCD displays H at finish of
sensor regeneration when zero is
pressed.
Internal contamination may
redeposit hydrogen sulfide from
flow system onto gold film
sensor.
Remove and replace fritware filter,
intake filter disk, scrubber filters
and Tygon tubing. Refer to “Flow
System” on Page 19.
Check tubing for kinks or crimps.
Repeat regeneration cycle. Refer to
page 12.
Zero adjust pot cannot be
adjusted to 0.
Pot not turned sufficiently.
Sensor may be ruptured or pot
may be broken.
1. Turn zero adjust up to 20 times
to reach the end. Pot will
“click” softly.
2. If no “0”, turn pot slowly in
opposite direction until display
reads “0”.
3. If still unchanged, call AZI
Customer Service at (800) 528-
7411 or 602-470-1414.
Page 24 of 50 AZI Customer Service 800-528-7411 or 602-470-1414