Honeywell 9782 Series - Manual (Page 68)

Conductivity/Resistivity Analyzer/Controller
9782 Series Conductivity/Resistivity Analyzer/Controller - Operator’s Manual 7/99 5-12
5.5 Configuring On/Off, Duration Adjusting Type (DAT), or
Pulse Frequency Type (PFT) Control
Purpose
During I/O setup you had an opportunity to specify whether to use one or more relays to achieve
control of a process variable with a discrete control strategy: On/Off, DAT or PFT.
On/Off control can be implemented based on any measured or computed value.
DAT and PFT control can be based on Cell 1 input, Cell 2 input, the computed ratio
Cell
Cell
1
2 , or the
computed difference Cell Cell 1 2
−
.
If you specified one or more of these discrete control types during I/O setup, you will be able to
configure the related parameter values.
For a discussion of tuning proportional control (applicable to PFT and DAT control) see
Appendix A.
Procedure
The procedure for configuring On/Off control is shown in Table 5-3.
The procedure for configuring PFT control is shown in Table 5-4.
The procedure for configuring DAT control is shown in Table 5-5.