Problem: How do you determine thermocouple (T/C) system resistance? Solution: Test adapters permit the rapid and error-free measurement of test voltages to calculate this figure.
Problem: How do you determine thermocouple (T/C) system resistance?
Solution: Test adapters permit the rapid and error-free measurement of test voltages to calculate this figure. First, set the voltmeter's function range to measure the T/C system's output millivolts and insert the measuring adapter with the test leads into the input jacks. Disconnect one T/C leadwire at the device terminal block that provides cold junction compensation. Connect one measure adapter test lead to the disconnected T/C leadwire and the other to the remaining leadwire. Record the millivolt reading (Eo).
Insert the shunt adapter into the measure adapter and record the reading (Et). Remove the measure adapter test clips and reconnect the T/C's leadwire to the terminal block. Then calculate the T/C's resistance using the formula: Rx = [Rt(Eo - Et)]/Et. A large change or steady drift indicates an accuracy problem.
Contributor: Alan Sellers, Lancaster, OH; 614-860-6119
Annual Salary Survey
After almost a decade of uncertainty, the confidence of plant floor managers is soaring. Even with a number of challenges and while implementing new technologies, there is a renewed sense of optimism among plant managers about their business and their future.
The respondents to the 2014 Plant Engineering Salary Survey come from throughout the U.S. and serve a variety of industries, but they are uniform in their optimism about manufacturing. This year’s survey found 79% consider manufacturing a secure career. That’s up from 75% in 2013 and significantly higher than the 63% figure when Plant Engineering first started asking that question a decade ago.