Emerson ROC827 instruction manual Preparing for Calibration, Issued Mar-06 Calibration

ROC827 Instruction Manual

Chapter 7 – Calibration

This section provides information about calibration procedures for the Analog Input (AI) modules, HART Input module, RTD Input module, and Multi-Variable Sensor (MVS) Input module. For the full calibration procedure, refer to the ROCLINK 800 Configuration Software User Manual (Form A6121).

In This Chapter

7.1	Calibration	7-1
7.2	Preparing for Calibration	7-1

7.1Calibration

Use ROCLINK 800 Configuration software to perform initial calibration or re-calibration of the inputs on the AI, HART, RTD, and MVS modules. Re-calibration would occur, for example, after a change in an orifice plate in the meter run handled by the ROC827. Calibration can be performed on sensor inputs from either orifice meter runs or turbine meter runs.

The AI and MVS calibration routines support five-point calibration, with the three mid-points calibrated in any order. The The low-end or zero reading is calibrated first, followed by the high-end or full-scale reading. The three mid-points can be calibrated next, if desired. The RTD calibration routine supports three-point calibrations.

The HART calibration routine supports two-point calibration. The low- end or zero reading is calibrated first, followed by the high-end or full- scale reading.

The diagnostic System Analog Inputs are not designed to be calibrated.

7.2Preparing for Calibration

Before calibrating the inputs from a sensor, HART device, or other device, you should prepare the ROC827 unit.

1.Verify the inputs are correctly wired. For information on wiring the inputs, refer to Chapter 4, Input/Output Modules.

2.If calibrating a pressure sensor input, be sure to remove the sensor from the flow as directed in the calibration procedure in the ROCLINK 800 Configuration Software User Manual (Form A6121).

3.Verify that any external monitoring devices (such as multimeters) are connected to the ROC827 unit, if they are required for the calibration.

Issued Mar-06 Calibration 7-1