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MODEL 399VP pH/ORP SENSOR SECTION 6.0
TROUBLESHOOTING
SECTION 6.0.
TROUBLESHOOTING
TROUBLESHOOTING. The table below lists common problems, causes and remedies typically encountered in
process measurement.
Problem Probable Cause Remedy
Meter reads off scale (display T.C. element shorted. Check T.C. element as instructed
reads overrange). in Section 5.2 and replace
sensor if defective.
Sensor not in process. Sample Make sure sensor is in process with
stream is low or air bubbles are sufficient sample stream (refer to
present. 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 5.2 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 5.2 and replace sensor
if defective.
Sluggish or slow meter indication Electrode coated. Clean sensor as instructed in
for real changes in pH level. Section 5.3. Replace sensor if
cracked.
Electrode defective. Replace sensor.
Transmitter cannot be standardized. Electrode coated or cracked. Clean sensor as instructed in
Section 5.3. Replace sensor if
cracked.
Transmitter short spans between Aged glass electrode or high Replace sensor.
two different buffer values. temperature exposure.
Electrode coated . Clean sensor as instructed in
Section 5.3. Replace sensor if
cracked.