30
MODEL 396/396VP/397/398/398VP
SECTION 5.0
TROUBLESHOOTING
Trouble
Probable Cause
Remedy
Meter reads off scale. (Display
T.C. element shorted.
Check T.C. element as instructed
reads overrange.)
in Section 4.2 and
replace sensor if defective.
Sensor not in process or sample
Make sure sensor is in process with
stream is low.
sufficient sample stream (refer to
Section 2.0 for installation details).
Open glass electrode.
Replace sensor.
Reference element open - no contact.
Replace sensor.
Display reads between 3 and 6 pH
Electrode cracked.
Replace sensor.
regardless of actual pH of solution
or sample.
Meter or display indication swings
T.C. element shorted.
Check T.C. element as instructed
or jumps widely in AUTO T.C. Mode.
in Section 4.2 and replace
sensor if defective.
Span between buffers extremely
T.C. element open.
Check T.C. element as instructed
short in AUTO T.C. Mode.
in Section 4.2 and replace sensor
if defective.
Sluggish or slow meter indication
Electrode coated.
Clean sensor as instructed in
for real changes in pH level.
Sections 4.1 Replace sensor
if cracked.
Electrode at end of life.
Replace sensor.
Transmitter cannot be standardized.
Electrode coated or cracked.
Clean sensor as instructed in
Sections 4.1. Replace sensor
if cracked.
Transmitter short spans between
Electrode at end of life, due to
Replace sensor.
two different buffer values.
old glass or high temperature
exposure.
Coated glass.
Clean sensor as instructed in
Section 4.1. Replace sensor
if cracked.
TABLE 5-1. Troubleshooting
SECTION 5.0
TROUBLESHOOTING
Summary of Contents for 396
Page 36: ......
