Troubleshooting Without Advanced Diagnostics - Emerson Rosemount Analytical 396P Instruction Manual

Section 6: Diagnostics & Troubleshooting
August 2013
6.2

Troubleshooting without Advanced Diagnostics

Table 7-2, below, lists common problems, causes and remedies typically encountered in process
measurement.
TABLE 6-2. Troubleshooting without Advanced Diagnostics
Problem
Meter reads off scale. (Display
reads overrange).
Display reads between 3 and 6 pH
regardless of actual pH of solution
or sample.
Meter or display indication swings
or jumps widely in AUTO T.C. Mode.
Span between buffers extremely
short in AUTO T.C. Mode.
Sluggish or slow meter indication
for real changes in pH level.
Transmitter cannot be standardized. Electrode coated or cracked
Transmitter short spans between
two different buffer values.
42
396P + 396PVP Sensors Instruction Manual
Probable Cause
Defective preamplifier
T.C. element shorted
Sensor not in process. Sample
stream is low or air bubbles are
present.
Open glass electrode
Reference element open - no contact
Electrode cracked
T.C. element shorted
T.C. element open
Electrode coated
Electrode defective
Defective preamplifier
Aged glass electrode or high
temperature exposure
Electrode coated
Air bubbles trapped in sensor end
between glass bulb and sensor body
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Remedy
Replace preamplifier (for code 02
sensors). For code 01, replace sensor.
Check T.C. element as instructed
in Section 6.1 and
replace sensor if defective.
Make sure sensor is in process with
sufficient sample stream (refer to
Section 2.0 for installation details).
Replace sensor.
Replace sensor.
Replace sensor.
Check T.C. element as instructed
in Section 6.1 and replace
sensor if defective.
Check T.C. element as instructed
in Section 6.1 and replace sensor
if defective.
Clean sensor as instructed in
Sections 6.2 or Section 6.3.2.
Replace sensor if cracked.
Replace sensor.
Clean Sensor as instructed in
Sections 6.2 or Section 6.3.2
Replace sensor if cracked.
Replace preamplifier.
Replace sensor.
Clean Sensor as instructed in
Section 6.2 or Section 6.3.2.
Replace sensor if cracked.
Shake the sensor in solution. See
Section 2.0 for mounting guidelines.
Diagnostics and Troubleshooting