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Bad Zero Cal Fail
The Zero Calibration will fail if the mV reading from the sensor is outside of the range –100 to 100
mV. If the actual concentration is actually zero, refer to the sensor’s instruction manual for
troubleshooting.
Output Timeout
This error message appears if one of the control outputs has been on longer than the maximum
amount of time programmed in the "Time Limit" menu found in the "Control 1" or "Control 2"
menus. It is reset by answering "Yes" to the "Reset Timer" prompt that will appear. There are a
number of possible reasons that the output could go on for longer than normal:
Possible Causes
Corrective Action
1. The process went further out of control than normal.
Increase time limit or reset timer.
2. The chemical supply has run out.
Replenish the chemical supply.
3. The pump or valve or supply line is faulty.
Repair or replace the control device.
4. Wrong chemical is being controlled. Replace
with
correct chemical.
5. The sensor is not responding to changes.
Repair or replace sensor or cable.
Refer to sensor instructions.
Evaluate mixing or recirculation.
High Alarm
This error message appears if the reading exceeds the set point for one of the AUX outputs that has
been configured as a high alarm output. There are a number of possible causes for this condition:
Possible Causes
Corrective Action
1. The process went further out of control than normal.
May have to increase chemical flow rate.
2. The chemical supply has run out.
Replenish the chemical supply.
3. The pump or valve or supply line is faulty.
Repair or replace the control device.
4. Wrong chemical is being controlled. Replace
with
correct chemical.
5. The electrode is not responding to changes.
Repair or replace sensor or cable.
Refer to sensor instructions.
Evaluate mixing or recirculation.
6. The pump is siphoning, valve leaking.
Repair or replace the control device or re-route tubing.
7. Control output has been left in "HAND" mode.
Switch back to "AUTO".
8. It may be a normal part of the process.
None required.
Low Alarm
As above for "High Alarm", except that the reading is below the set point of one of the AUX 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.
Out Range Alarm
This error message appears if the reading is outside of the range selected for one of the AUX outputs
that has been programmed as an "Out of Range Alarm". Refer to the possible causes and corrective
actions listed above for the "High Alarm" error message.
In Range Output
This error message appears if the reading is inside of the range selected for one of the AUX outputs
that has been programmed as an "In Range Alarm". Refer to the possible causes and corrective
actions listed above for the "High Alarm" error message.
