Q: Can the WAP10 be calibrated in the field?

Answer: No, the absolute pressure transmitter cannot be calibrated in the field.

Q: Could you explain and double check the implementation of the zero set in the released IAN AP ENs?

Answer: The IAN Zero Offset operation is simplistic.  There are no protection mechanisms with respect to current reference value.  If user wants to apply zero offset for AP, a perfect vacuum would be the target pressure.

The IAN devices, including AP, do not support trimming operations.  There is no way to perform a “zero calibration”.  What the “Zero” operation does is perform a “Zero Offset” operation.

So, Yes, to perform a zero offset on an IAN AP device, the transmitter would need to be at full vacuum.

Q: What are the internal limits to the offset (zero set feature) for the WAP10? And, is the end node smart enough to know that the zero the user is trying to set is out of a limit imposed by the firmware?

Answer: The IAN devices have no limit checking when applying Zero Offset.

Q: If the WAP10 is not zeroed at full vacuum, the WiFi interface will not show any errors at all and it will just save the new zero whatever that value is. Correct?

Answer: YES.

Q: For a WAP10 if the user zeroed the meter at anything other than full vacuum, will the “Zero default” be able to recover the transmitter characterization and return the transmitter back to normal? Or would the user have to ship the unit back to be serviced in the factory?

Answer: The user can issue the “Zero default” at any time, to return unit back to normal.  No need to ship back to factory.

Q: How do you use the Zero Default? What process conditions does it need?

Answer: The AP transmitter can be cleared of the applied Offset, at any time, by reverting to the Zero “Default” via the WiFi overview page.

The transmitter does NOT need to be at vacuum to “undo” (Default) the applied offset.  The Default can be applied at any pressure, to “undo” any currently applied offset.

Q: What would be the corrective action if the sensor has slightly drifted and the device indicates a value of 17 PSIA when exposed to an atmospheric pressure of 14.7 PSIA?
Answer: Due to the deviation of the reported pressure of 17 psia at 14.7 psia reference, we conclude that the instrument calibration is not functioning properly.

Because there is no way to remedy this in the field, the instrument should be returned to the factory for evaluation.

Questions: Help is available at FieldDevices-Support@se.com

Released for:Schneider Electric Indonesia