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These are required if service technicians need to check a thermocouple without a J calibrated temperature meter. Check the thermocouple if you find the temperature variation of the thermostat is more than ± 5.F from the set point. To check a thermocouple, follow this procedure: Note: The Type J thermocouple requires the use of a Type J temperature meter. If a type J meter is not available use a millivolt meter and refer to the tables of degrees/millvolt values following, to calculate the cold junction compensation. Remember that the accuracy of you measurements can be no more accurate than your instruments. Thermocouples generate very small voltages. Many voltmeters cannot read millivoltages accurately. Set all control thermostats to the same temperature (350.F). Allow the griddle plate to saturate and achieve a steady temperature. Place a surface temperature probe on the griddle surface about the thermocouple you want to check. The surface must be cleaned before this procedure. If there is any grease residue on the probe or griddle plate, it will introduce an error in your reading. Take the temperature reading of the plate above the controlling thermocouple. Disconnect the thermocouple from the temperature and, either connect it to a J type calibrated temperature meter to measure the temperature output directly or, do the following: measure and record the millivolts generated by the thermocouple. Measure the ambient temperature. Refer to the table and add the corresponding millvoltage for the ambient temperature to the value measured from the thermocouple. Find the corresponding temperature in the chart for millvoltge result. Example: if the ambient room temperature is 20. C add the millvolt value of 20.C (1.019mV) from the chart to the millvolt reading of the meter and find the temperature value in the chart. The temperature should match the reading on the surface of the plate. SERVICE BULLETIN #95-5 continued SERVICE BULLETIN #95-5 continued Type J - Thermocouples (0° to 440°F) EMF In Millivolts - Reference Junction 0°F °F 0 1 2 3 4 5 6 7 8 9 10 0 -0.885 -0.868 -0.831 -0.803 -0.776 -0.748 -0.721 -0.694 -0.666 -0.639 -0.611 10 -0.611 -0.583 -0.556 -0.528 -0.501 -0.473 -0.445 -0.418 -0.390 -0.362 -0.334 20 -0.334 -0.307 -0.279 -0.251 -0.223 -0.195 -0.168 -0.140 -0.112 -0.084 -0.058 30 -0.058 -0.028 0.000 0.028 0.056 0.084 0.112 0.140 0.168 0.196 0.224 40 0.224 0.253 0.281 0.309 0.337 0.365 0.394 0.422 0.450 0.478 0.507 50 0.507 0.535 0.563 0.592 0.620 0.648 0.677 0.705 0.734 0.762 0.791 60 0.791 0.891 0.848 0.876 0.905 0.933 0.962 0.990 1.019 1.048 1.076 70 1.076 1.105 1.134 1.262 1.191 1.220 1.248 1.277 1.396 1.335 1.363 80 1.363 1.392 1.421 1.450 1.479 1.507 1.536 1.565 1.594 1.623 1.652 90 1.652 1.681 1.710 1.739 1.768 1.797 1.826 1.855 1.884 1.913 1.942 100 1.942 1.971 2.000 2.029 2.058 2.088 2.117 2.146 2.175 2.204 2.233 110 2.233 2.263 2.292 2.321 2.350 2.380 2.409 2.438 2.467 2.497 2.526 120 2.526 2.555 2.585 2.614 2.644 2.673 2.702 2.732 2.761 2.791 2.820 130 2.820 2.849 2.879 2.908 2.938 2.967 2.997 3.026 3.056 3.085 3.115 140 3.115 3.145 3.174 3.204 3.233 3.263 3.293 3.323 3.352 3.381 3.411 150 3.411 3.441 3.470 3.500 3.530 3.560 3.589 3.619 3.649 3.678 3.708 160 3.708 3.738 3.768 3.798 3.827 3.857 3.887 3.917 3.947 3.976 4.006 170 4.006 4.036 4.066 4.096 4.126 4.156 4.186 4.216 4.245 4.275 4.305 180 4.305 4.335 4.365 4.395 4.425 4.455 4.485 4.515 4.545 4.575 4.605 190 4.605 4.635 4.665 4.695 4.725 4.755 4.786 4.816 4.846 4.876 4.906 200 4.906 4.936 4.966 4.996 5.026 5.057 5.087 5.117 5.147 5.177 5.207 210 5.207 5.238 5.268 5.298 5.328 5.358 5.389 5.419 5.449 5.479 5.509 220 5.509 5.540 5.570 5.600 5.630 5.661 5.691 5.721 5.752 5.782 5.812 230 5.812 5.843 5.873 5.903 5.934 5.964 5.994 6.025 6.055 6.085 6.116 240 6.116 6.146 6.176 6.207 6.237 6.268 6.298 6.328 6.359 6.389 6.420 250 6.420 6.450 6.481 6.511 6.541 6.572 6.602 6.633 6.663 6.694 6.724 260 6.724 6.755 6.785 6.816 6.846 6.877 6.907 6.938 6.968 6.999 7.029 270 7.029 7.060 7.090 7.121 7.151 7.182 7.212 7.243 7.274 7.304 7.335 280 7.335 7.365 7.396 7.426 7.457 7.488 7.518 7.549 7.579 7.610 7.641 290 7.641 7.671 7.702 7.732 7.763 7.794 7.824 7.855 7.885 7.914 7.947 300 7.947 7.977 8.008 8.039 8.069 8.100 8.131 8.161 8.192 8.223 8.253 310 8.253 8.284 8.315 8.345 8.376 8.407 8.437 8.468 8.499 8.530 8.560 320 8.560 8.591 8.622 8.652 8.683 8.714 8.745 8.775 8.806 8.837 8.867 330 8.867 8.898 8.929 8.960 8.990 9.021 9.052 9.083 9.113 9.144 9.175 340 9.175 9.206 9.236 9.267 9.298 9.329 9.359 9.390 9.421 9.452 9.483 350 9.483 9.513 9.544 9.575 9.606 9.636 9.667 9.698 9.729 9.760 9.790 360 9.790 9.821 9.852 9.883 9.914 9.994 9.975 10.006 10.037 10.068 10.098 370 10.098 10.129 10.160 10.191 10.222 10.252 10.283 10.314 10.345 10.376 10.407 380 10.407 10.437 10.468 10.499 10.530 10.561 10.592 10.622 10.653 10.684 10.715 390 10.715 10.746 10.777 10.807 10.838 10.869 10.900 10.931 10.962 10.992 11.023 400 11.023 11.054 11.085 11.116 11.147 11.177 11.208 1...

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