Honeywell 9782 Series manual Performing I/O Setup, Display resolution and unit of measure

Conductivity/Resistivity Analyzer/Controller

5.3 Performing I/O Setup

Purpose

Before you can configure your Analyzer/Controller to implement your alarm and control strategy you must perform I/O setup. In I/O setup you choose the features to be used, based on the hardware capability of the 9782 model being configured. Using your selections, the software will display the relay and analog output assignments appropriate for your application. The choices made during I/O setup determine which prompts and menu choices are available during configuration. For a discussion of the features available, and of the interactions affecting relay assignments, see Section 1.

I/O setup is also used to specify relay action. The relay action used for alarm and/or control action for all relays in the Analyzer/Controller can be specified as energized or de-energizedon alarm (or when discrete control point is ON).

In addition, I/O setup is used to specify display resolution and unit of measure (see below).

Display resolution and unit of measure

For standard range models (9782C-S0), the resolution of the display of conductivity or resistivity can be selected. (No other displays are affected.)

∙When set to LOW, the decimal point is fixed. It remains in the same place throughout the display range.

∙When set to HIGH, the decimal point will automatically be shifted one place to the left to provide greater resolution when the displayed value falls below 10% of the high display range, and conversely, be shifted back when the value increases above 10%.

This selection of low or high display range has no effect on the fixed or auto output range status.

For conductivity measurement the unit of measure can also be specified for standard range Analyzer/Controllers. No unit of measure is displayed for wide range models. The Analyzer/Controller automatically uses the conductivity unit of measure appropriate for the cell constant (see Wide Display Ranges table in Sub-Section 2.1.5.)

ATTENTION

If you use I/O setup to view parameters, making no changes, a cold reset will not occur. However, if you change any parameter other than the type of solution for which temperature compensation should be applied, you will cause the Analyzer/Controller to perform a cold reset (see page 5-1). This cold reset is necessary to ensure that the integrity of the unit remains intact when critical parameters have been changed.

ATTENTION

AutoClean and range status indication cannot be selected for use with two cells simultaneously. Your choices are:

∙For Cell 1 only, use AutoClean (Relay 1) and/or range status indication (Relay 2).

∙For both Cell 1 and Cell 2, use AutoClean (Relays 1 and 3), with no range status indication, nor any discrete control.

∙For both Cell 1 and Cell 2, use range status indication (Relays 2 and 4), with no AutoClean, nor any discrete control.

5-4 9782 Series Conductivity/Resistivity Analyzer/Controller - Operator’s Manual 7/99