Emerson manual Rosemount 3051N, Reference Manual, 00809-0100-4808,Rev CA June

Reference Manual

00809-0100-4808, Rev CA June 2008

Rosemount 3051N

HTc = URV + S (URV) Ps

Where:	HTc =	Corrected High Trim Value
	URV =	Upper Range Value
	S =	–(Span shift per specification)
	Ps =	Static Line Pressure
In this example:
	URV =	1500 inH2O
	LRV =	500 inH2O
	Ps =	1200 psi
	S =	-(-0.01/1000 psi) = 0.01/1000psi
To calculate the corrected low trim (LTc) value:
	LTc =	500 in H20 + (0.01/1000 psi)(500 in H20)(1200 psi)
	LTc =	506 in H2O
To calculate the corrected high trim (HTc) value:
	HTc =	1500 in H20 + (0.01/1000 psi)(1500 in H20)(1200 psi)
	HTc =	1518 in H2O

To complete a Rosemount 3051N full trim, enter the corrected values for low trim (LT) and high trim (HT). Refer to “Full Trim” on page 2-18.

Enter the corrected input values for low trim and high trim through the communicator keypad after you apply the nominal value of pressure as the transmitter input.

NOTE

After calibrating Rosemount 3051N Range 4 and Range 5 transmitters for high differential pressure applications, rerange the 4 and 20 mA points using the communicator to maintain the systematic static line pressure correction. You may re-zero the 4 mA point at line pressure after installation using the local zero button without affecting the completed calibration.

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