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Procedural Considerations

Page 26 34-ST-25-20 MC Toolkit User Manual Release 0

7/03

Table 4 Input Calibration (DE Transmitters) - Correct Input (Zero), LRV, URV; Reset

Corrects

Input Calibration (De Transmitters) - Correct Input (Zero), LRV, URV; Reset Corrects

Requirements:

· Input source, with accuracy of at least

0.04%

· resistor, at least 250-ohms

· Voltmeter or Ammeter

· 24 Vdc Power Supply (nominal)

· Clean work area with suitable

environmental conditions.

· Pressure Transmitter must be level.

Overview of Procedures:

The Zero-Correct procedure establishes the

correct vertical positioning of the response

profile.

The LRV Correct and URV Correct

procedures establish the correct slope of the

response profile in the process operating

range by rotating the response profile

around the zero-reference point as a pivot.

The Zero-Correct procedure can be done at

any time during the Correct LRV and

Correct URV procedures in the same

calibration session.

The Correct LRV and Correct URV

procedure should never be performed

without first performing the Correct Input

(Zero) procedure in the same calibration

session.

Objective(s):

Using a precision PV input source as a reference, command

the transmitter to write calibration coefficients to Non-

Volatile Memory associated with transmitter input

hardware and software.

· Correct Input (Zero)

· Correct LRV

· Correct URV

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Compaq MC-1 Manual do Utilizador Página 34