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Introduction
7/99 9782 Series Conductivity/Resistivity Analyzer/Controller - Operator’s Manual
1-3
1.2 Features
Automatic cell washing
The standard AutoClean feature can periodically rinse cells automatically. The schedule and
duration of the operation are configurable. An internal relay actuates external solenoid valves to
control the flow of rinse water to the cells.
Computed values
The Analyzer/Controller can calculate and display your choice of the following values:
• ratio of the two cell inputs
• difference between two cell inputs
• percent passage
• percent rejection
• parts per million carbon dioxide (9782C-S0 only)
The equations used are in the specifications in Section 2.
Automatic range scaling
The Analyzer/Controller supports automatic range scaling of the output. If this feature is
enabled, then when the measured value falls below 10% of the output scaling limit, the output is
scaled by a factor of 10. An internal relay can be dedicated to this function. The relay closes
contacts
NC-COM when the output is scaled to the low range, and closes contacts NO-COM when the
range shift occurs. The relay can be used to control an indicator or to switch the output to a
second channel of a multipoint recorder when the range change occurs.
This output range scaling has no effect on the display. Display scaling is specified independent
of output scaling.
Password protection
A password (up to four digits) can be configured. If the security feature is enabled, the password
will be required to access configuration, calibration, and maintenance software functions.
Extensive diagnostics
The 9782 Analyzer/Controller performs extensive self-diagnostics as a background task during
normal operation. If a problem is detected, a message is displayed on the alarm stripe to alert the
operator. In addition, the operator can initiate keypad and display tests using Maintenance Menu
functions.