SMAR LD291, Operation And Maintenance Instruction Manual

Page: 35 / 84

Configuration
3.9
EXAMPLE:
1 2 3 4 5 6 7 8 9 10 11 12 13
L D 2 9 1 M 2 1I 1 1 0 1 H1
LD291 Intelligent Pressure Transmitter (D) ; Range: 1.25 to 50 kPa (2) ; Diaphragm of 316L SS,
Silicone Oil Fill Fluid (1) , and Connection to the process with 316L SS (1I) ; with Digital Indicator (1) ;
Electrical Connection 1/2 - 14 NPT (0) ; with Local Adjustment (1) ; with Carbon Steel Bracket and
accessories (1) ; housing in SS (HI) .

SERIAL NUMBER - Three serial numbers are stored:
Circuit Number - This number is unique to every main circuit board and cannot be changed.
Sensor Number - The serial number of the sensor connected to the LD291 and cannot be
changed. This number is read from the sensor every time a new sensor is inserted in the main
board.
Transmitter Number - the number that is written at the identification plate each transmitter.
NOTE
The transmitter number must be changed whenever there is the main plate change to avoid
communication problems.

OP_COUNT - Every time a change is made, there is an increment in the respective change
counter for each monitored variable, according to the following list. The counter is cyclic, from 0 to
255. The monitored items are:
LRV/URV: when any type of calibration is done;
Function: when any change in the transference function is done, e.g., linear, square root,
const, table;

Trim_4mA: when the current trim is done at 4 mA;

Trim_20mA: when the current trim is done at 20 mA;

Trim_Zero/Lower: when pressure trim is done at Zero or Lower Pressure;

Trim Upper Pressure: when the trim is done at Upper Pressure;
Characterization: when any change is made in any point of the pressure characterization table
in trim mode;
Multidrop: when any change is made in the communication mode, for example, multidrop or
single transmitter;
Pswd/C-Level: when any change is made in the password or the level configuration.

BACKUP
When the main board is replaced, after assembling and powering it, the data saved in the sensor
memory are automatically copied to the main board memory.

RESTORE
This option allows copying or restoring the data saved in the sensor memory to the main board
memory.