SMAR LD292, Руководство по эксплуатации, техническому обслуживанию и инструкциям

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LD292 - Operation and Maintenance Instruction Manual
4.4
Interchangeability
In order to obtain an accurate and better temperature compensated response. Each sensor is
submitted to a 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.
Upgrading LD291 to LD292
The sensor and casing of the LD291 is exactly the same as the LD292 . By changing the circuit
board of the LD291 it becomes a LD292 . The display on LD291 version 3.XX , is the same as on
LD292 and can therefore be used with the LD292 upgrade circuit board. With a LD292 version three
or earlier, that display can not be used.
Upgrading the LD291 to a LD292 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 LD291 main board out of the housing and disconnect the power supply and the sensor
connectors.
Put in the LD292 main board reversing the procedure for removing the LD291 circuit.
Returning Materials
Should it become necessary to return the transmitter and/or configurator to
SMAR , simply contact
our office, informing the defective instrument serial number, and return it to our factory.
If it becomes necessary to return the transmitter and/or configurator to Smar, simply contact our
office, informing the defective instrument's serial number, and return it to our factory. In order to
speed up analysis and solution of the problem, the defective item should be returned with the
Service Request Form (SRF
– Appendix B) properly filled with a description of the failure observed
and with as much details as possible. Other information concerning to the instrument operation,
such as service and process conditions, is also helpful.
Instruments returned or to be revised outside the guarantee term should be accompanied by a
purchase order or a quote request.