TB 9-4931-428-40
NOTE
The accuracies specified in table 1 are accuracies of
thermometers without scale corrections at time of procurement.
They do not require verification except for initial acceptance.
EQUIPMENT REQUIREMENTS
calibration procedure. This equipment is issued with Secondary Reference Calibration
Standards Set NSN 4931-00-621-7878. Alternate items may be used by the calibrating
activity. The items selected must be verified to perform satisfactorily prior to use and must
bear evidence of current calibration. The equipment must meet or exceed the minimum use
between the standard and TI. Where the four-to-one ratio cannot be met, the actual
accuracy of the equipment selected is shown in parenthesis.
paragraph 4 above, and are used in this calibration procedure. When necessary, these
items may be substituted by equivalent items, unless specifically prohibited.
Table 2. Minimum Specifications of Equipment Required
Manufacturer and model
Common name
Minimum use specifications
(part number)
Range: -30C to +260 C
Rosemount Aerospace, Model 162C
0.003 C
THERMOMETER
or 162CE
Accuracy:
SUPER
Range: -38C to +250C
Hart Scientific, Model 1590
THERMOMETER
Accuracy:
0.003C
Table 3. Accessories Required
Manufacturer and model
Common name
Description
(part number)
TEMPERATURE
Range: -40C to +150C
Hart Scientific, Model 7341
BATH No. 1
TEMPERATURE
Range: +20C to +250C
Hart Scientific, Model 6045
BATH No. 2
THERMOMETER
(7911944)
CALIBRATION KIT