Meriam MFT 4010 Modular Calibrator_HART Communicator - Manual (Page 37)

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DOCUMENTING CALIBRATION RESULTS
The MFT 4000, MFT 4005, and MFT 4010 include documenting to enable the user to document Manual Calibration
Procedures, From PC (Stored) Calibration Procedures and Template Calibration Procedures. (See the
Applications section of this manual for typical calibration connection diagrams). Typically, Manual, From PC, and
Template procedures require an As Found calibration check, trimming operations to correct an out-of-calibration
condition, and an As Left calibration check. MFTs with the documentation capability provide this functionality. The
MFT can measure or simulate the input to the device under test as well as measure the output of the device under
test. It also supports the keyed entry of the device under test’s output values to document calibrations of local
Indicators, fieldbus devices, and loop tests as well.
Manual Calibration Procedures are performed by varying the input signal (e.g. pressure for a pressure transmitter),
allowing the input to stabilize, and saving the measurements made by the MFT to memory. Manual calibrations can
be defined on the fly by the technician as the variable to the unit under test is applied, or the MFT can be used in
advance of the calibration to create a manual calibration procedure in the field. If the device under test is a HART
device, the AO and Pres (PV) obtained via HART communication will also be saved. If the device is a local indicator
or fieldbus device, or if a current loop is being calibrated, the user keys in the device output value so that it can be
saved along with the MFT measured or simulated value. The number of calibration points saved per manual
calibration is up to the user (maximum of 255 per device).
From PC (Stored) Calibration Procedures prompt the user for each input signal according to the predefined
procedure stored in the MFT memory. Stored procedures are set up in the Meriam Device Management System
software and assigned to device tag numbers there. The procedures are then downloaded to the MFT. Conventional
and HART transmitters can both be supported by “From PC” procedures as can local indicators, fieldbus devices, and
loop calibrations. When calibrations become due, the DMS operator downloads the list of tag or loop numbers and
their associated procedures to the MFT. The technician then takes the MFT to the field, makes the needed
connections to the device of interest, looks up the “From PC” stored procedure for the device under test, and begins
the calibration. The MFT guides the user through the complete procedure and electronically documents the results.
Template Calibration Procedures are created on the MFT and are available for recall and reuse at any time. One
pressure template, one temperature template and one switch template are available for setup and saving to memory.
Templates are useful for repetitive calibrations on similarly configured field devices of the same type. Template setup
follows the Create Manual Calibration Procedures menus.
The dedicated MFT calibration memory can save up to 100 calibration result files with up to 21 As Found and 21 As
Left points with header information including Tag, S/N, LRV, URV, date and time.
Overview
The MFT 4000 Series of multi-function calibrators come with
standard documenting capability. Documenting enables the
MFT to work with manually created or DMS generated “From
PC” or “stored” calibration procedures for use with specific field
devices, save As found results, trim the device, save the As left
results, view saved calibration results and upload saved results
to Meriam’s Device Management System (DMS). MFTs with the
full HART option (MFT 4010) also have the ability to save
configurations to memory and upload those configurations to
DMS to provide a complete history on the field device. For more
information on DMS, please go to
www.meriam.com or contact Meriam at (216) 281-1100.