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 |
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Meter reads off scale (display | T.C. element shorted. |
| Check T.C. element as instructed |
reads overrange). |
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| in Section 5.2 and replace |
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| sensor if defective. |
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| 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). |
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| Open glass electrode. |
| Replace sensor. |
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| Reference element open - no contact. |
| Replace sensor. |
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Display reads between 3 and 6 pH, | Electrode cracked. |
| Replace sensor. |
regardless of actual pH of solution |
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or sample. |
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Meter or display indication swings | T.C. element shorted. |
| Check T.C. element as instructed |
or jumps widely in AUTO T.C. Mode. |
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| in Section 5.2 and replace |
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| sensor if defective. |
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Span between buffers extremely | T.C. element open. |
| Check T.C. element as instructed |
short in AUTO T.C. Mode. |
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| in Section 5.2 and replace sensor |
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| if defective. |
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Sluggish or slow meter indication | Electrode coated. |
| Clean sensor as instructed in |
for real changes in pH level. |
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| Section 5.3. Replace sensor if |
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| cracked. |
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| Electrode defective. |
| Replace sensor. |
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Transmitter cannot be standardized. | Electrode coated or cracked. |
| Clean sensor as instructed in |
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| Section 5.3. Replace sensor if |
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| cracked. |
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Transmitter short spans between | Aged glass electrode or high |
| Replace sensor. |
two different buffer values. | temperature exposure. |
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| Electrode coated . |
| Clean sensor as instructed in |
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| Section 5.3. Replace sensor if |
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| cracked. |
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