Troubleshooting Error Codes

When an error occurs with your Alicat product, you will be shown an error code. Here is a reference that describes some common error codes and troubleshooting measures you can take to resolve the issue.

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Error Codes

ADC-    This error is indicative on an analog to digital conversion error. Typically this will occur when there is an internal hardware issue. This is caused by the main board not being able to talk to the processor chip.

  • Unit must be sent into Alicat for repairs.

MOV-  This is an error indicating that the mass flow has gone over range of the device (currently 128% of full scale). This also will show up if the set point is too far over the custom range of the device. Custom ranges increase accuracy by decreasing the full scale.

  • Reduce flow and recheck operating conditions.
  • Before using, verify readings on the device at atmospheric conditions
  • Compare these readings to a known state.
  • If unit has a custom down-scale range, and a higher range is desired, unit must be sent in for reconfiguration and re-calibration.
  • If sensor damage is suspected, check registers 8 and 10, and compare them to the values originally shipped on the device.

OPL-    The instantaneous (with no averaging) pressure has exceeded the designated over pressure limit. This causes the valve on the device to close.

  • The set point on the device must be adjusted digitally or physically on the front screen.
  • A power cycle will also clear the OPL error.

POV-   Similar to MOV and VOV, this error indicates that the pressure has gone over the specified range of the device (currently 128% of full scale).

  • Reduce pressure and recheck operating conditions.
  • Before using, verify readings on the device at atmospheric conditions
  • Compare these readings to a known state.
  • If sensor damage is suspected, check registers 8 and 10, and compare them to the values originally shipped on the device. You may also check the PSIA reading of your device at ambient conditions. If your value is non-reasonable number, you may have a damaged sensor.

TOV-    This error means the temperature is outside of the bounds specified within our devices. When the temperature is outside specified bounds, flow readings are no longer reliable. On older non-rechargeable battery units, this would happen roughly 10-60 minutes before the unit would lose all charge.

  • Check power supply output. If a power supply dips in voltage, the temperature readings are typically the first to show signs.
    • On older non-rechargeable battery units, this would happen roughly 10-60 minutes before the unit would lose all charge.
  • Replace battery (older battery units)
  • Verify there is no sensor damage
  • Compare readings in a known atmospheric condition.

VOV-   Similar to MOV and POV, this error indicates a volumetric flow reading that is outside the range of the device.

  • Reduce flow and recheck operating conditions.
  • Before using, verify readings on the device at atmospheric conditions
  • Compare these readings to a known state.

If sensor damage is suspected, check registers 8 and 10, and compare them to the values originally shipped on the device. You may also check the PSIA reading of your device at ambient conditions. If your value is non-reasonable number, you may have a damaged sensor.

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