MODEL 381pH/ORP | SECTION 3.0 |
| MAINTENANCE |
TABLE 3-1. Troubleshooting
| Trouble | Probable Cause Remedy |
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Meter reads off scale. | Reference electrolyte depleted. | Replace reference electrolyte as |
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| instructed in Section 3.2.2. |
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| Defective preamplifier. | Check preamplifier as instructed in |
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| Section 3.4 and replace |
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| preamplifier if defective. |
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| T.C. element shorted. | Check T.C. element as instructed in |
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| Section 3.5, and replace body if |
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| defective. |
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| Electrode not in solution or sample | Make sure sensor is in solution or that |
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| stream is not full. | sample stream is full (refer to Section |
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| 2.0 for installation details). |
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| Open glass electrode. | Replace glass electrode. |
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| Plugged liquid junction. | Replace liquid junction. |
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| Recharge reference cell. |
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| Reference element open- | Replace reference element. |
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| no contact. |
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Meter reads between 3 and 6 pH | Electrode cracked. | Replace electrode. |
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regardless of actual pH of |
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solution or sample. |
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Meter indication swings widely | T.C. element shorted. | Check T.C. element as instructed in |
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in AUTO T.C. Mode. |
| Section 3.5 and replace body if |
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| defective. |
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Span between buffers extremely | T.C. element open. | Check T.C. element as instructed in |
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short in AUTO T.C. mode. |
| Section 3.5 and replace body if |
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| defective. |
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Sluggish or slow meter indication | Electrode coated. | Clean electrode as instructed in |
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for real changes in pH level. |
| Section 3.2.1. |
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| Electrode defective. | Replace electrode. |
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Transmitter cannot be | Electrode coated or cracked. | Clean electrode as instructed in |
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standardized. |
| Section 3.2.1 and, if cracked, |
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| replace electrode. |
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| Reference chamber is contaminated | Replace gel solution as |
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| instructed in Section 3.2.2. |
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| Defective preamplifier. | Check preamplifier as instructed in |
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| Section 3.4 and replace if |
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| defective. |
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| If trouble still persists, | Replace |
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| electrode is defective. |
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Meter short spans. | Old glass electrode (greater than 1 | Replace electrode. |
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| year use). |
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| Coated glass. | Clean with soft cloth and clean water. |
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17
