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High Alarm
This error message appears if the pH/ORP reading exceeds the set point for one of the Control outputs that has been configured as a
high alarm output. There are a number of possible causes for this condition:
Possible Cause
Corrective Action
The process went further out of control than normal.
May have to increase chemical flow rate.
The chemical supply has run out.
Replenish the chemical supply.
The pump or valve or supply line is faulty.
Repair or replace the control device.
Wrong chemical is being controlled. Replace
with
correct chemical.
The electrode is not responding to changes.
Replace electrode, cable or preamplifier. Evaluate mixing or
recirculation.
The pump is siphoning, valve leaking.
Repair or replace the control device or re-route tubing.
Control output has been left in "HAND" mode.
Switch back to "AUTO".
It may be a normal part of the process.
None required.
Probe Error
This error message appears if the pH/ORP input signal is outside of the normal range. This usually indicates that the electrode has
been disconnected or is faulty. It could appear under normal conditions if the pH is outside of the operating range of -2 to 16pH, or
if the ORP is outside of the normal range of ±1500 mV.
Possible Cause
Corrective Action
Controller is faulty; fails self test (see section 5.2)
Re-check pH self test with preamp disconnected. If it still
fails, send controller back for repair. If it passes, preamp is
faulty.
Preamplifier has no power to it.
If battery powered preamp, replace battery. If preamp is
powered by our controller, check +5V, -5V terminals vs COM
terminal. Should read +5VDC ±5% and -4.6 VDC ±-5%.
Preamplifier is faulty.
Indicated if ±5VDC power out of spec w/preamp attached, but
in spec without preamp attached. Repair or replace preamp.
Electrode is faulty.
Replace electrode.
Interlock
This error message indicates that control has been stopped because the closed contact signal from a flow switch or level switch is
now open and one or more control outputs have been programmed to interlock.
Possible Cause
Corrective Action
Flow has stopped, level too low.
May be a normal condition, otherwise restore flow or level.
Flow, level switch disconnected.
Reconnect.
Flow, level switch faulty.
Verify that switch closes using an ohmmeter. If not, repair or
replace.
Controller faulty.
Verify that error message disappears if controller flow switch
input is shorted. If not, repair controller.
Calibration Time
This message appears to prompt you to perform the routine maintenance of cleaning and calibrating the electrode. It does not
appear based upon any analysis of the condition of the electrode. The frequency of calibration is set by the user in the "Days
Between Cal" menu found in the "Sensor" menu. If you do not want to be prompted to perform a calibration, set this menu to "0".
Low Alarm
As above for "High Alarm", except that the pH/ORP reading is below the set point of one of the Control outputs that has been set
up as a low alarm output. Refer to the possible causes and corrective actions listed above for the "High Alarm" error message.
