Series 655T/656T Transmitter User's Manual mV/TC Input
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- 7 -
Table 4: Thermocouple milliVoltage Versus Temperature
(From the National Institute of Standards and Technology (NIST) Thermocouple Tables)
TEMP
Thermoelectric Voltage In milliVolts (With Reference Junction at 0
C)
C
J
K
T
E
R
S
B
- 250
---
-6.404
-6.181
-9.719
---
---
---
- 200
-7.890
-5.891
-5.603
-8.824
---
---
---
- 150
-6.499
-4.912
-4.648
-7.279
---
---
---
- 100
-4.632
-3.553
-3.378
-5.237
---
---
---
- 50
-2.431
-1.889
-1.819
-2.787
---
---
---
0
0.000
0.000
0.000
0.000
0.000
0.000
0.000
+ 50
2.585
2.022
2.035
3.047
0.296
0.299
---
+ 100
5.268
4.095
4.277
6.317
0.647
0.645
---
+ 150
8.008
6.137
6.702
9.787
1.041
1.029
---
+ 200
10.777
8.137
9.286
13.419
1.468
1.440
---
+ 250
13.553
10.151
12.011
17.178
1.923
1.873
---
+ 300
16.325
12.207
14.860
21.033
2.400
2.323
---
+ 350
19.089
14.292
17.816
24.961
2.896
2.786
---
+ 400
21.846
16.395
20.869
28.943
3.407
3.260
---
+ 450
24.607
18.513
---
32.960
3.933
3.743
1.002
+ 500
27.388
20.640
---
36.999
4.471
4.234
1.241
+ 550
30.210
22.772
---
41.045
5.021
4.732
1.505
+ 600
33.096
24.902
---
45.085
5.582
5.237
1.791
+ 650
36.066
27.022
---
49.109
6.155
5.751
2.100
+ 700
39.130
29.128
---
53.110
6.741
6.274
2.430
+ 800
---
33.277
---
61.022
7.949
7.345
3.154
+ 900
---
37.325
---
68.783
9.203
8.448
3.957
+1000
---
41.269
---
76.358
10.503
9.585
4.833
+1200
---
48.828
---
---
13.224
11.947
6.783
+1400
---
---
---
---
16.035
14.368
8.952
+1600
---
---
---
---
18.842
16.771
11.257
+1700
---
---
---
---
20.215
17.942
12.462
+1750
---
---
---
---
20.878
18.504
13.008
+1800
---
---
---
---
---
---
13.585
5.0 SERVICE AND REPAIR
CAUTION:
Risk of Electric Shock - More than one
disconnect switch may be required to de-energize the
equipment before servicing.
SERVICE AND REPAIR ASSISTANCE
This module contains solid-state components and requires no
maintenance, except for periodic cleaning and transmitter
configuration parameter (zero and full-scale) verification. Since
Surface Mounted Technology (SMT) boards are generally difficult
to repair, it is highly recommended that a non-functioning module
be returned to Acromag for repair. The board can be damaged
unless special SMT repair and service tools are used. Further,
Acromag has automated test equipment that thoroughly checks
and calibrates the performance of each module. Please refer to
Acromag’s Service Policy Bulletin or contact Acromag for
complete details on how to obtain service parts and repair.
PRELIMINARY SERVICE PROCEDURE
Before beginning repair, be sure that all installation and
configuration procedures have been followed and that the unit is
wired properly. Verify that power is applied and that your power
supply voltage is sufficient to supply full-scale current into the
load (0.020*R), plus 12V at the module terminals, plus any line
drop. If you continue to have a problem with the unit after making
these checks, then an effective and convenient fault diagnosis
method is to exchange the questionable module with a known
good unit.
Acromag’s Application Engineers can provide further
technical assistance if required. When needed, complete repair
services are available from Acromag.