Hach 8450 Instrument Manual page 5

Residual free chlorine monitor
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4.2 Probe Maintenance and Poor Probe Output ..................................................................................................... 51
4.2.1 Membrane Troubleshooting and Maintenance......................................................................................... 51
4.2.2 Quick Membrane Replacement Procedure.............................................................................................. 51
4.2.3 Probe Electrode Maintenance ................................................................................................................. 52
4.2.4 Testing Thermistor Output ....................................................................................................................... 53
4.2.5 Testing for Electrical Isolation .................................................................................................................. 54
4.3 Resolving Calibration Problems ........................................................................................................................ 54
4.3.1 Timer Expires During Zero Calibration .................................................................................................... 55
4.3.2 Timer Expires During Span Calibration ................................................................................................... 56
4.4 Reading Drifts After Span Calibration ............................................................................................................... 57
4.5 Calibration Error Messages............................................................................................................................... 57
4.6 Calibrating with a Simulated Input..................................................................................................................... 57
4.6.1 Equipment Required................................................................................................................................ 57
4.7 *CHECK* Messages (Alphabetical Listing) ....................................................................................................... 59
4.8 Resetting Factory Defaults ................................................................................................................................ 60
Replacement Parts and Accessories ...................................................................................................................... 61
Contact Information for U.S.A. and Outside Europe ............................................................................................... 63
Contact Information for Europe ............................................................................................................................... 64
Warranty ................................................................................................................................................................. 65
16116TOC.fm
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