must have at least two sets of the equipment on hand. Never turn in both sets at the same time. Rotate
them to keep a calibrated set on hand. DA Form 2402 (Exchange Tag) is filled out and attached to each
item of equipment that must be sent to a calibration facility. The sending petroleum laboratory files the
bottom portion of the tag for accountability purposes.
C level calibration. C level calibration (standardization) is performed at the petroleum laboratory by
laboratory personnel using an A level calibrated set of equipment. Once an item of equipment has
passed C level calibration, a completed DA Label 80 (US Army Calibrated Instrument) is either attached
to the item of equipment or to the DD Form 314 and kept on file. Items of equipment which fail C level
calibration should have a DA Form 2417 (US Army Calibration System Rejected Instrument) attached so
that they will not be used. These items of equipment, along with items of equipment being returned from
the A level calibration facility, should be turned in for repair or disposal.
Verification of requirements. It is necessary to verify that calibration requirements for laboratory
equipment have been established in accordance with:
Applicable ASTM test methods.
PART C - CHECK CALIBRATION DUE DATES, REVIEW CALIBRATION
SUSPENSE ACCORDING TO SCHEDULE ON DD FORM 314, AND FILE AND
REVIEW C LEVEL PROCEDURES
Calibration due dates. DD Form 314 is used to record calibration due dates of petroleum laboratory
equipment. These due dates are based on the manufacturers recommended calibration requirements.
Check calibration due dates. It is necessary to check DD Form 314 for each piece of equipment that
requires periodic calibration. For the equipment that needs to be calibrated at another location, it is
necessary to be sure that the turn-in procedures have been followed correctly.
Review calibration suspense file for completeness and accuracy. Calibration suspense
files are used to track periodic calibration for various equipment. Be sure to review these suspense files
Review laboratory internal C-level calibration procedures. DA Label 80 should be checked
to ensure the calibration procedures are being completed in accordance with TB 750-25. It is necessary to
verify that laboratory technicians follow calibration guidelines in the applicable TM or manufacturer's
instructions for specified equipment.