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Troubleshooting 23
3
89VP Instruction Manual Section 5: Troubleshooting
PN 51-389VP January 2013
Section 5: Troubleshooting
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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 4.2 and
replace sensor if defective.
Make sure sensor is in process with
ot refer( maerts elpmas tneiciffus
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
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sensor if defective.
Span between buffers extremely
Check T.C. element as instructed
in Section 4.2 and replace
sensor if defective.
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Sluggish or slow meter indication
.level Hp ni segnahc laer rof
Electrode defective.
Transmitter cannot be standardized.
Defective preamplifier. Replace preamplifier.
T.C. element shorted
Electrode cracked. Clean sensor as instructed in
Sections 4.1 or 4.3.2. Replace
sensor if cracked.
Electrode coated or cracked. Clean Sensor as instructed in
Sections 4.1 or 4.3.2 and, if
cracked, replace sensor.
Replace sensor.
Transmitter short spans between
two different buffer values.
Old glass electrode or high
temperature exposure.
Replace sensor.
Coated glass. Clean Sensor as instructed in
Sections 4.1 or 4.3.2. Replace
sensor if cracked.
Sensor not in process or sample
stream is low.
TABLE 5-1. Troubleshooting