Product Alert #61
4 Electrode Water Conductivity Probe (6536P/2)
Accuracy at Low Readings
26 November 2001
Problem
The Four Electrode Conductivity Cell (4EC cell) fitted in the Model 6536P/2 Water Conductivity Probe (and earlier 6536P probes) 4 Electrode Water Conductivity Probe will not hold +/- 2% accuracy at low readings below 500 uS/cm, and especially below 100uS/cm. The Model 6536C (or B) 4 Electrode Water Conductivity Instrument /MicroLogger on the other hand will retain 1% accuracy throughout its specified range.
Correction
The 6536P/2 4 Electrode Water Conductivity Probe should be considered to have the following accuracy:
| Conductivity Range |
Probe Accuracy |
Probe and Inst. Accuracy |
| Above 500uS/cm |
2% |
3% (max) |
| Between 500 – 100uS/cm |
3% |
4% (max) |
| Below 100uS/cm |
4% |
5% (max) |
Should your application require greater accuracy below 500uS/cm (at the expense of higher readings), contact your local distributor for special probes manufactured specifically for low conductivity.
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