Honeywell 9782 Series - Manual (Page 74)

Conductivity/Resistivity Analyzer/Controller
9782 Series Conductivity/Resistivity Analyzer/Controller - Operator’s Manual 7/99 5-18
5.8 Configuring AutoClean
Purpose
The AutoClean feature periodically rinses the cells automatically (see Section 7). If this feature
was selected during I/O setup (described in 5.3), configure control of AutoClean as described
below.
AutoClean configuration consists of specifying the frequency and duration of the rinses.
ATTENTION
For AutoClean to operate, the 24-hour clock must be set as described in 5.7.
The piping and valves required by AutoClean are shown in Section 7.
There are two modes of operation, timer-initiated and operator-initiated through the front panel
as described below.
Timer-initiated operation
With the 24-hour clock turned ON and the AutoClean feature enabled (and the appropriate piping
in place), this mode performs unassisted cell cleaning. The AutoClean Time Remaining on-line
display provides an up-to-date time stamp of the next occurrence of an automatic cell cleaning.
Once the timer reaches zero, the cell cleaning will occur. Upon completion, the timer will be
reset and the Time Remaining display will again provide a countdown to the next cleaning. To
temporarily disable timer-initiated AutoClean, you must either turn off the 24-hour clock (which
preserves your timer setup), or set the timer to all zeros (see Step 3 in Table 5-8). Unless the
Time Remaining display is on screen, you will not see the AUTO CLEAN message during a
scheduled cleaning.
Operator-initiated operation
To operate in this mode, you must have the AutoClean Time Remaining display on screen.
Initiate the AutoClean sequence by pressing the START soft key. Once the START soft key is
pushed, the time display will go to zero and the message “AUTO CLEAN” will appear on the
alarm stripe.
The sequence will stop cleaning if the STOP soft key is pressed or if you leave this display.
Once stopped, the Analyzer/Controller will wait for the configured resume delay time (to allow
the cell measurement to stabilize) before coming back on-line. During the resume delay the
“AUTO CLEAN” message will flash.
If the PAUSE soft key is used while the AutoClean Time Remaining display is on screen, the
AutoClean sequence will stop temporarily. If the PAUSE soft key is not pushed again to resume
the sequence, then the sequence will automatically resume in 20 minutes.
Once the AutoClean sequence has been completed (including resume delay), the “AUTO
CLEAN” message disappears and the time remaining clock will be displayed again, showing the
time remaining until the next scheduled timer-initiated cleaning.