TB 9-4931-428-40
8. Zero Point Temperature Check
a. Performance Check
(1) Insert TI (model 62C) into temperature standard.
NOTE
If necessary, an ice bath may be substituted for temperature
standard.
(2) After at least 3 minutes, record TI temperature indication.
NOTE
To minimize, emergent stem error, observe indication through
cell just above ice mantle.
(3) Repeat (1) and (2) above two times at 5 minute intervals.
(4) Average the three indications recorded in (2) above. Record zero point
indication. If average indication is not within 0.05 degree Celsius, perform b below.
(5) Repeat technique of (1) through (4) above for remaining TI's listed in table 4.
Average indication will be within limits specified.
Table 4. Zero Point Check
Test instrument
Scale correction
Rejection tolerance
Tolerance ( C)
( C)
Model
Army Part No.
62C
7912276-1
0.05
0.3
63C
7912276-2
0.05
0.3
64C
7912276-3
0.05
0.3
65C
7912296-4
0.05
0.3
66C
7912276-5
0.05
0.3
67C
7912276-6
0.1
0.4
68C
7912276-7
0.1
0.5
69C
7912276-8
0.1
0.6
1
1
1
ASTM 80-182
0.028 ( 0.05 F)
0.22 ( 0.4 F)
ASTM 50F
7913469
1See
note after table 5.
b. Adjustments
(1) If TI indication exceeds scale correction tolerance listed in table 4, but does not
exceed rejection tolerance, prepare a correction chart, specifying scale correction.
(2) If TI indication exceeds rejection tolerance limitation listed in table 4, TI
will be rejected.
