SMAR LD290, Operation And Maintance Manual

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LD290
– Operation and Maintenance Instruction Manual
3.8
Pressure Trim [TRIM]
This field of the tree is used to adjust the digital reading according to the applied pressure. The pressure
TRIM differs from RANGING WITH REFERENCE, since the TRIM is used to correct the measure and
RANGING WITH REFERENCE reach only the applied pressure with the output signal of 4 to 20 mA.
P ROTE CTE D B Y PA SS WO RD. THE PA S SW ORD C ODE IS S IM ILAR
THAT DE SCRIB E D FO R THE OP E RATION (M ODE ), IN T HE PA GE 4.11.
SAVE E S C
z
z
s
s
U PPER
s s
z z
U PPER
ZERO
s
z
LO W ER
s
z
s
z
LO W ER
TR IM * E S C
s
z
Figure 3.5 shows the options available to run the pressure TRIM.
Figure 3.5
– Pressure Trim Tree
Trim Branch (TRIM)
Z: Moves to ESC function.
S: These functions are protected by a "password." When prompted PSWD
activates ( S ) 2 times to proceed. After entering the password, the TRIM branch
starting with the Zero Trim function is accessed.
Zero Pressure Trim (ZERO)
NOTE
Check on section 1, the note on the influence of the mounting position on the indicator.
For better accuracy, the trim adjustment should be made in the in the lower and upper values of the
operation range values.
Z: Moves to the LOWER pressure TRIM function.
S: Trims the transmitters' internal reference to read 0 at the applied pressure.
Lower Pressure Trim (Lower)
Z: Moves to option DECREASES THE LOWER PRESSURE VALUE.
S: Adjusts the transmitter's internal reference, increasing the displayed value
that will be interpreted as the Lower Pressure value corresponding to the applied
pressure.