Conductivity/Resistivity/Tds Difference; Parts Rinsing - Honeywell 9782 Series Operator's Manual

Conductivity/Resistivity Analyzer/Controller

Conductivity/Resistivity/TDS Difference

Conductivity/Resistivity/TDS difference using redundant cells on critical processes can provide a
valuable diagnostic capability. If the difference in measurements exceeds the alarm points, an
operator is summoned for corrective action. Monitoring may be switched to the alternate cell
during maintenance. For deviation in either direction, two different alarms (+ and -) are used. A
difference kind of diagnostic can be provided by a precision check resistor in place of one cell to
give continuous Analyzer/Controller checking at one value. See also Appendix D.
Process

Parts Rinsing

Parts rinsing is usually controlled by conductivity to obtain adequate rinsing without wasting
excess water, whether a single stage or a counter-current series of tanks. The two-cell ratio
approach can determine whether inadequate rinsing is due to low flowrate or due to poor supply
water quality.
Rinse
Water
Conductivity Ratio =
Appendix B - 2 9782 Series Conductivity/Resistivity Analyzer/Controller - Operator's Manual
9782 Analyzer
Cell 2
Cell 1
Cell 1
Cell 2
Cell 1
Typical Ratio Range is 0.1 to 1.1
Cell 2
Output Signal
Difference Alarm
a/n 23190
Parts Flow
Waste Water
a/n 23191
7/99