RTD CALIBRATION

TM-5-3895-374-24-2 M081 Asphalt Mixing Plant Manual
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TM 5-3895-374-24-2 955-257 6.12 THERMOCOUPLE CALIBRATION All thermocouple input controllers are calibrated in the same manner. A 50.000 mV source, and a J T/C in an Ice Bath are required. All thermocouple input controllers are calibrated with a type J thermocouple. This display indicates that a stable, precision noise free 50.000+.005 mV INPUT DC calibration source be connected to the rear case terminals F (-) and H 50.OO0MV (+). Allow a two minute interval for the input circuit to stabilize with the 50.000 mV applied and then push the PARAM DISPLAY key. Without removing the AC power, change the input to a J type thermocouple J T/C in an Ice Bath. Allow a 2 minute interval for the input circuit to ICE BATH stabilize and then push the PARAM DISPLAY key. Proceed to Section 6.15. 6.13 RTD CALIBRATION RTD input controllers should be calibrated using a precision decade resistance. Be sure to use short, low resistance leads and good tight connections. Three wire connections to the input are required to minimize lead resistance errors. All wires must be the same gauge and length. This display is the first step for RTD calibration. Connect the RTD resistance box and set for 100.00±.05 Q. Allow a 2 minute interval for the input circuit to stabilize and then push the PARAM DISPLAY key. Set the RTD resistance box for 300.00±.05 2. Allow a 2 minute interval for the input circuit to stabilize and then push the PARAM DISPLAY key. For controllers with 0.1° RTD resolution, different inputs may be specified. Proceed to Section 6.15. 6.14 PROCESS CALIBRATION An appropriate voltage or current source is required for process input calibration. This display is the first step for process input calibration. Connect the calibrator and set its output to the LO calibration value. With a 4-LO CAL 20 mA input, the LO CAL would be 4 mA. Allow a 2 minute interval for the input circuit to stabilize and then push the PARAM DISPLAY key. Adjust the calibrator to output the HI calibration value. With a 4-20 Ma input, the HI CAL would be 20 mA. Allow a 2 minute interval for the HI CAL input circuit to stabilize and then push the PARAM DISPLAY key. ECLIPSE INSTRUMENTATION DIVISION (page 3 - 1122) INPUT 50.000MV J T/C IN ICE BATH INPUT LO CAL INPUT HI CAL

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