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THERMOMETERS
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TM-5-6640-213-14 Laboratory Air Mobile Aviation Fuel NSN
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Chapter 4 DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE INSTRUCTIONS - TM-5-6640-213-140115
TM 5-6640-213-14
(3) Calculating results.  Record the ice point reading and
compare it with the previous ice point reading.  If the ice point is
higher or lower than 32 degrees F, all other temperature readings of
the thermometer must be correspondingly increased or decreased; i.e.,
if the observed ice point is above 32 degrees F, the correction
factor is added to the observed reading; if the observed ice point is
below 32 degrees F, the correction factor is subtracted from the
observed reading.  Example:  Observed ice point 33 degrees F, add 1
degree F to all observed readings; observed ice point is 31 degrees
F, subtract 1 degree F from all observed readings.
c.  Preparation of Thermometer.  The thermometer is prepared for
ice point determination by one of the following methods:
(1) The thermometer is maintained at room temperature (70
degrees F) (21.1 degrees C) for at least 72 hours prior to determine
ice point.
(2) The thermometer is heated to a specified temperature
and the ice point is determined immediately after heating, or within
a stated time period.  If the ice point is determined after heating,
a note indicating the temperature to which the thermometer was heated
and the observed ice point  must appear in the certification sheet.
The routine laboratory thermometers must be accurate to + or - 0.6
degrees F.
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