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42 Diagnostics and Troubleshooting
6.2 Troubleshooting without Advanced Diagnostics
Table 7-2, below, lists common problems, causes and remedies typically encountered in process
m
easurement.
Problem Probable Cause Remedy
Meter reads off scale. (Display Defective preamplifier Replace preamplifier (for code 02
reads overrange).
sensors). For code 01, replace sensor.
T.C. element shorted Check T.C. element as instructed
in Section 6.1 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 6.1 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 6.1 and replace sensor
if defective.
Sluggish or slow meter indication Electrode coated Clean sensor as instructed in
for real changes in pH level. Sections 6.2 or Section 6.3.2.
Replace sensor if cracked.
Electrode defective Replace sensor.
Transmitter cannot be standardized. Electrode coated or cracked Clean Sensor as instructed in
Sections 6.2 or Section 6.3.2
Replace sensor if cracked.
Defective preamplifier Replace preamplifier.
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 6.2 or Section 6.3.2.
Replace sensor if cracked.
Air bubbles trapped in sensor end Shake the sensor in solution. See
between glass bulb and sensor body Section 2.0 for mounting guidelines.
TABLE 6-2. Troubleshooting without Advanced Diagnostics
Section 6: Diagnostics & Troubleshooting 396P + 396PVP Sensors Instruction Manual
August 2013 LIQ_MAN_396P_396PVP