Chemtrol PC3000 - Low Alarm; High Alarm; Time Limit; Run Time

MANUALPC-2010 CHAPTER IV - OPERATION Page 36
3.4 - Low Alarm
The ALARM LOW value is set to generate an alarm when the
pH reading falls below the set value. To change the value,
press the RIGHT ARROW key and enter the numerical value
with the digital keypad (see ORP submenus).
After the alarm value is set, the ALARM OPTIONS Submenu
1.4.1 is displayed, to set the feed interlock and alarm buzzer
options. Use the UP and DOWN keys to highlight the desired
line and press the RIGHT ARROW key for Yes or NO.
If the Sanitizer Lock option is set to YES, a low pH condition
disables the sanitizer feed (ORP and Sanitizer functions).
3.5 - High Alarm
The ALARM HIGH value is set to generate an alarm when the
pH reading rises above the set value. After the alarm value is
set, the ALARM OPTIONS screen is shown, asking whether a
high alarm condition should stop the feeder and activate the
alarm buzzer (see ORP submenus).
If the Sanitizer Lock option is set to YES, a high pH condition
disables the sanitizer feed (ORP and Sanitizer functions).
3.6 - Time Limit
T
he TIME LIMIT sets the maximum allowed time (in minutes)
for continuous acid or base feed (see ORP submenus). This
acts as a safety feature to prevent overfeeding in case of
malfunction of the chemical feeder or as an alarm if the feed
tank runs empty. The standard (default) value for pH is 15
minutes.
When in alarm, Time Limit is reset by highlighting the value
and pressing "OK". To defeat the safety timer, enter zero (0).
3.7 - Run Time
T
he RUN TIME line displays two separate values: the amount
of running time in minutes for each current activation event and
the total run time since last reset to zero.
To reset the cumulative run time, enter zero in the far right
column. To reset only the current run time, highlight Time Limit
value and press “OK” (see ORP submenus).
The Total Feed Time submenu 3.7.1 is used to show the feed
time from a tank since last reset to zero. Knowing the pump
feed rate, it can be used to monitor the emptying of the tank
and set a low-level alarm. This feature is particularly useful for
remote monitoring of the chemical tanks.
3.8 - Probe Clean
The Probe Clean Menu is used for automatic rinsing of the tips
of the ORP and pH sensors by injection of a cleaning solution
(usually a weak acid solution) through the recirculation line.
It has three modes of operation: Off, Manual and Automatic
(see Submenu 3.8).
In both the Manual and Automatic modes, it allows a recovery
time for the sensors to prevent chemical overfeeding while the
signal is still affected by the cleaning solution (see Submenu
3.8.1). The recommended minimum is 1 minute.
Submenu 3.4.1
Submenu 3.7.1
Submenu 3.8
Submenu 3.8.1
Submenu 3.8.2
In the Automatic mode, a 7-day weekly program is used to set
up the ON and OFF times for probe cleaning any day or every
day of the week (see Submenu 3.8.2).
IMPORTANT NOTE: Probe Clean is available only when
Conductivity control is OFF.
PROBE CLEAN
OFF
Manual
Auto
PROBE CLEAN
ON
OFF
MO 19:00 19:05
TU 00:00 00:00
WE 19:00 19:05
TH 00:00 00:00
FR 19:00 19:05
SA 00:00 00:00
SU 19:00 19:05
Total Feed Time
Max (min) 120
Actual (min) 17
ALAR
M OPTIONS
Feed lockout YES
Alarm buzzer YES
Sanitizer Lock NO
PROBE CLEAN
Electrode Recovery
Time (min: 1 min)
3
min