ROLA-CHEM Digital Controller PN 554135 5/04/2017 Page: 9 of 20
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 flash and the pH feeder will be disabled. The system will automatically reset
when the alert condition has been cleared by itself or by an operator.
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 set the pH
reading to the desired pH level.
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.
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 until set point is reached and the
current feed cycle is complete or until Consecutive Feed Alert Limit is reached or 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 setpoint by 10mV to reduce on/off cycles.
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 ORP readout will scroll through the available HI alert ORP
levels (650 mV to 900mV, preset at 900 mV). Release the button when the desired level is
reached.
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 ORP readout will scroll through the available ORP
levels (100 mV to 640 mV in 5 mV increments and “OFF”). Release the button when the
desired level is reached. The pH CALIB button is not functional in the ORP mode.
Note: If the ORP reading is out of the pre-set alert range for more than ten (10) minutes the ORP
red alert lamp will illuminate and the ORP feeder will be disabled. The system will
automatically reset when the alert condition has been cleared by itself or by an operator.
