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Problems will arise if you try to connect an incorrect display to a 4000 Series Transmitter which is why we discourage swapping displays among transmitters.
To determine if you have a 4299 SI board or an Inversys SI board, open the 4000 Series Configuration Software, find the transmitter then check Status/Information.
Transmitters with a 4299 SI board will have a Sensor Software Version greater than 5.
If you have an Invensys display connected to a 4299 SI board, it will create invalid sensor readings (e.g. static pressure readings of 250,000 PSI. These invalid readings will also be reported to the flow computer or any other device polling the transmitter. Removing the display from the transmitter should allow the transmitter to read normal values again.
You can visually differentiate between the old and new style displays by looking at the back of the display (see attached pictures below). The PCB fills the display casing with the old style displays, and is more rectangular with the new style displays. The old style displays will work with any 4000 series product. The new style displays will flash a version string at power up like *LCDAT* .
During the transition, a small number of new boards were modified with one of the connector pins cut for transmitters with the 4299 SI Board.
Transmitters with the Invensys SI board can work with:
Transmitters with the 4299 SI board can work with: