SMAR DT302, Руководство по эксплуатации и техническому обслуживанию владельца

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DT302 – Operation, Maintenance and Instructions Manual
4.4
Figure 4.2 - Four Possible Positions for Display
Anchor the main board and display with their screws (3) .
After tightening the protective cover
(1) , mounting procedure is complete. The transmitter is ready to
be energized and tested.
Interchangeability
In order to obtain an accurate and better temperature compensated response. Each sensor is
submitted to a factory characterization process and the specific data is stored in an EEPROM
located in the sensor body.
Every time the power is turned on, the main circuit reads the sensor serial number, should it differ
from the number stored in the memory. The circuit understands that there is a new sensor and the
following information is transferred from the sensor to the main circuit.

Temperature compensation coefficients.

Sensor's trim, including 5-point characterization curve.

Sensor characteristics: type, range, diaphragm material and fill fluid.
The other transmitter characteristics are stored in the main circuit memory and are not affected by
sensor change.
Data transfer from the sensor to the main circuit can also be forced by parameter
BACKUP_RESTORE previously explained. In case of changing of the main board, the information
of the sensor, as described above are up-to-date.
Upgrading DT301 to DT302
The sensor and casing of the DT301 is exactly the same as the
DT302 . By changing the circuit
board of the DT301 it becomes a DT302 .
Upgrading the DT301 to a
DT302 is therefore very much the same as the procedure for replacing
the main board described above.
To remove the circuit board
(5) , loosen the two screws (3) that anchor the board. Caution with the
circuit boards must be taken as mentioned above. Pull the DT301 main board out of the housing
and disconnect the power supply and the sensor connectors.
Put in the
DT302 main board reversing the procedure for removing the DT301 circuit.