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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