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| Calibration Failure. |
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Low sensor output. |
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Replace sensor. Sensor output can be measured across the 2 male sensor pins. Should be at least 18 microamps with the sensor exposed to air. |
| Calibration Failure. |
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Defective probe handle assembly. |
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Replace assembly. Check for corrosion on the 2 female pins that the sensor mates with. Pins are gold plated, if they are black or green in color replace assembly. Check for proper placement probe handle o-ring to reduce future corrosion. |
| Calibration Failure. |
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Solenoid valve failure |
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During calibration the solenoid in the sampling section opens which exposes the sensor to air. Ensure that this is occurring. |
| Calibration Failure. |
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Open wiring |
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Check interconnect cable from junction box to the orange connector at TB3 of the analog board. Be sure connector is firmly seated and wires are not crimped on insulation. Check for continuity between junction box and analog board. |
| High/Low readings. |
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Defective probe handle assembly. |
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Replace assembly. Check for corrosion on the 2 female pins that the sensor mates with. Pins are gold plated, if they are black or green in color replace assembly. Check for proper placement of both sensor o-rings to reduce future corrosion. |
| High/Low readings. |
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Faulty sensor. |
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Replace sensor. If possible swap with a known good sensor from another unit to verify. |
| High/Low readings. |
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Faulty thermistor. |
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Check temp. reading on analyzer is within 3 degrees celcius of the actual sample temp. |
| High/Low readings. |
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Low sample flow. |
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Incoming sample flow should be set to 100-150ml/min minimum. If a steady, unbroken stream of sample can be seen in the main overflow tube then sample flow is adequate. |
| High/Low readings. |
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O-ring placement. |
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Be sure of proper placement of replacement sensor o-rings. Larger o-ring must be installed in the flowcell block to ensure an airtight seal around the sensor. Smaller o-ring is placed on probe handle assembly. |
| High/Low readings. |
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Fouled/dirty sensor membrane. |
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Waltron recommends installation of a 60 micron filter on the incoming sample. |
| Current outputs (4-20mA) not working. |
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Current frozen more than 30 minutes after calibration. |
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Press the reset button. |
| Current outputs (4-20mA) not working. |
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Range knob has been changed. |
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The 20mA output will correlate to the highest end of the selected range. |
| Display flashes “out”. |
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Sample concentration is higher than selected range. |
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Select higher range. |
| Display flashes “hot”. |
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Sample temperature exceeds 55 degrees C. |
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Reduce sample temperature. |
| Display flashes reading within selected range. |
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Sensor nearing failure. |
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The display will flash the measured reading after a sensor has passed calibration with a marginal current output. |
Spare
Parts