Service Policy - Walchem WDP420 Instruction Manual

Out Range Alarm
This error message appears if the pH/ORP reading is outside of the range selected for one of the Control 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 pH/ORP reading is inside of the range selected for one of the Control 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.
Temp Sensor Err
This error message appears if the signal from the automatic temperature compensation element disappears during operation. It is
usually caused by a failure of the platinum RTD, or by a problem with the cabling or connections of the cable.
The Pt1000 RTD should read 1000 ohms at 0°C and 3.85 ohms/degree C above zero. At 25°C it should read 1096.25 ohms ±1%.
A higher reading or open circuit (infinite resistance) may indicate a bad connection. A lower reading may indicate a shorted cable.
Measure the resistance at each connection between the sensor and the controller to determine if the sensor, cabling or connections
are faulty.
Check Set Points
This is a normal display if you have changed the choice of sensor from pH to ORP or vice versa. The default set points for each
choice is different, and will not match what you need for your application. Always select the sensor type before setting the control
output set points.
8.0

SERVICE POLICY

The WPH Series pH/ORP Controller has a 2-year warranty on electronic components and a 1-year
warranty on mechanical parts (keypad, terminal strip and relays).
We stock circuit boards for immediate exchange after we have isolated the cause of the problem.
Factory authorized repairs that are received by next-day-air will be returned within 24 hours. Normal
priority for returns is two weeks.
Out of warranty repairs or circuit board exchanges are done on a flat fee basis after the warranty is
expired.
5 BOYNTON ROAD HOPPING BROOK PARK HOLLISTON, MA 01746 USA
WALCHEM CORPORATION
TEL: 508-429-1110 FAX: 508-429-7433 WWW.WALCHEM.COM
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