ROLA-CHEM
®
Digital Controller PN 554135 07/11/19 Page: 10 of 24
Hi Alert
: Pressing the HI ALERT button allows the operator to set or turn off the HI alert level
feature. As the button is pressed the pH readout will scroll through the available HI alert pH
levels (7.5 to 8.4 and off). Release the button when the desired level is reached. The Hi
Alert cannot be turned off in the BASE feed selection.
Low Alert
: Pressing the LOW ALERT button allows the operator to set or turn off the Low
alert level feature. As the button is pressed the pH readout will scroll through the available
Low alert pH levels (6.8 to 7.4 and off). Release the button when the desired level is
reached. The Low Alert cannot be turned off in the ACID feed selection.
Note: If the pH reading is out of the pre-set alert range for more than ten (10) minutes the pH
red alert lamp will illuminate and the pH feeder will be disabled. The system will
automatically reset when the water chemistry has been corrected.
pH Calibrate
: This button allows the operator to calibrate the pH sensor to a buffer or to a
sample tested with a test kit. Pressing the pH CALIB button allows the operator to adjust
the pH reading to match the buffer or test kit value.
Note: The sample to be tested should always be taken from the flow cell or container in which
the pH sensor is located. The pH calibration allows the adjustment of +/- 1 pH in .1 pH
increments.
Consecutive Feed Alert Limit
: The Digital Display numbers will flash and the pump/feeder
will not activate if the Set Level is not reached within the preset Consecutive Feed Alert
Limit. See appendix for setting Consecutive Feed Alert Limit.
3.3.4 ORP SET mode:
This
enables the first five programming buttons to set desired ORP
parameters.
Feed Once
: By pressing the FEED ONCE button, the ORP feeder will feed and delay for one
complete feed cycle. See FEED TIME Button for feed/delay times. If the feed time is set
for “Continuous feed” the manual feed will not operate.
Set Level
: Pressing the SET LEVEL button once will display the current set level. To change
the set level, press and hold the SET LEVEL button (which displays in 5 mV increments)
until the desired level is reached.
Feed Time
: The feed times are displayed in seconds. There is a five (5) minute delay time
associated with each feed time. Pressing the FEED TIME button allows the user to scroll
through the available feed times. Release the button when the desired ORP feed time is
reached. To set the controller in Continuous feed mode, release the button when the
display reads “con”. Continuous feed runs feeder continuously; (1) until set point is reached
or (2) until Consecutive Feed Alert Limit is reached or (3) until Hi/Low Alert limit is reached.
See appendix for Consecutive Feed Alert Limit details. Feed time can also be set to “off”.
Note: The controller will overshoot the ORP Set Level by 10mV to reduce on/off cycles.
