TB 9-4920-454-24
NOTE
Throughout this procedure it will be necessary to frequently
check the ambient temperature to assure proper millivolt
values in table 3 are applied.
Table 3. Ambient Temperature Versus Millivolt Values
Degrees
Degrees
Millivolt dc
(Fahrenheit)
(Centigrade)
values
70
21.1
0.843
71
21.7
0.865
72
22.2
0.888
73
22.8
0.910
74
23.3
0.933
75
23.9
0.955
76
24.4
0.978
77
25.0
1.000
78
25.6
1.023
79
26.1
1.045
80
26.7
1.068
81
27.2
1.090
82
27.8
1.113
83
28.3
1.135
84
28.9
1.156
85
29.4
1.181
(4) Refer to table 3 and adjust calibrator for an mV dc output equal to millivolt
value corresponding to ambient temperature recorded in (3) above.
(5) If TEMP oC indicator does not indicate 0, perform b (1) through (4) below.
(6) Reverse leads at calibrator OUTPUT (BLUE to HI and RED to LO) (fig. 2).
(7) Adjust calibrator for an 8.13 mV dc output, less millivolt value equivalent to
ambient temperature obtained in table 3.
(8) If TEMP oC indicator does not indicate between 198 and 202, perform b (5)
through (7) below.
(9) Repeat (7) above for calibrator outputs, less ambient temperature equivalent in
millivolts, listed in table 4. If out-of-tolerance condition exists, perform b (5) through (7) below.
Table 4. Temperature Indicator Accuracy Check
Temperature instrument temperature
oC
Calibrator
Min
Max
mV dc output
398
402
16.40
598
602
24.91
798
802
33.30
998
1002
41.31
1198
1202
48.89
1395
1399
55.82
6
