Temperature Calibration
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Temperature Calibration APPLICATIONS AND SOLUTIONS

INTRODUCTION Temperature devices in process manufacturing environments provide measurements to the process plants’ control systems. The performance of these temperature instruments is often critical to optimized operation of the process manufacturing plant or proper functioning of the plant’s safety systems. Process temperature instruments are often installed in harsh operating environments, causing their performance and the performance of their sensors to shift or change over time. Keeping these devices measuring temperature within expected limits requires periodic verification,...

Automating Transmitter and Sensor Calibrations Temperature transmitter calibrations are often performed without taking into account temperature sensor performance. For many processes this has been an acceptable practice, although the sensor typically contributes more errors than the transmitter. This practice can be problematic for critical process measurements or those that need a higher degree of confidence or accuracy. Testing the transmitter and its respective process sensor together provides a more complete test. If performed with the proper test equipment, error contributions from the...

Hart Dry-well cable kit, P/N 2111088 DOCUMENTING PROCESS CALIBRATOR Interface cable Null modem Fluke Calibration Dry-well (DB9) Fluke Calibration 3.5 mm interface cable Fluke Calibration Dry-well (3.5 mm) To perform the test: To use a dry-well calibrator with a Fluke 754 to automatically test a transmitter with sensor: STEP Remove the process measure- ment sensor and install into the dry-well temperature calibrator. STEP Record the As-Found test STEP Connect the mA measure- ment jacks of the 754 to the transmitter and connect the dry-well communication cable between the 754 and the...

Automating Temperature Calibration at the Bench Automating temperature calibration has many advantages. For example, technicians need automation because they are under tremendous pressure to do more with limited resources, and automation can help reduce the number of repetitive time-consuming tasks required to complete a calibration. Managers need automation to improve the productivity of their workforce, to reduce the skills required to complete calibration tasks, and to ensure compliance with documented procedures every time. Automated calibration can be performed in the plant or shop...

Temperature Source Control Output TECH TIPS Unit Under Test Reference Probe • Only one temperature source can be connected at a time. Example Temperature Control Source To perform the test: STEP Connect the calibrator to the temperature source with the appropriate data cable. • The 1586A allows you to set the required stability band to accept a temperature measurement. • The 1586A comes with Fluke DAQ 6.0 software, which allows you to handle and visualize your data. • Easily export data to a USB stick in .csv format for analysis on a computer in a spreadsheet program. STEP Insert the...

HART Smart Temperature Transmitter Calibration Smart temperature transmitters, with their flexibility and enhanced accuracies, have become the number one temperature calibration workload for instrumentation professionals. Calibrating a HART smart temperature transmitter requires an accurate temperature simulator or temperature source, mA measurement, and a HART communication tool for calibration. You can use separate tools or a calibrator that integrates all three to perform this task. Before going to the field: Gather the needed calibration and communication test tools. If testing a RTD...

Simulating Thermocouples and RTDs for calibration and testing TEST DC PWR TECH TIPS TC transmitter calibration connection TC transmitter calibration connection RTD transmitter calibration connection S-3 RTD transmitter calibration connection To perform the test: ©2015 Fluke Corporation. Specifications subject to change without notice. 07/2015 6005865a-en To use a calibrator with integrated HART communication to perform a calibration on a HART smart temperature transmitter: ©2015 Fluke Corporation. Specifications subject to change without notice. 07/2015 6005865a-en STEP Disconnect the...

Calibrating and Testing RTD Sensors Typically RTDs are checked while calibrating the connected device, such as a panel meter or temperature transmitter. However, if a problem is suspected with a temperature sensor, sensor calibrations can be performed separately from the calibration of process electronics. Field checks of temperature sensors can be easily performed with a dry-block or Micro-Bath. For best results, a full calibration of a temperature sensor is performed at the bench. Suggested test tools 9144 Field Metrology Well and 5615 Secondary Reference Temperature Standard See pg 34 10...

To perform the test: STEP Isolate the sensor from the process. STEP Fully immerse the sensor into a precision temperature source, such as a dry-well or bath capable of covering the required temperature range. TECH TIPS • Dry-wells have inserts that are interchangeable and have a variety of hole patterns to accommodate various probe sizes. • To achieve published performance levels, the insert’s hole size should be no more than a few hundredths of an inch larger than the probe being calibrated. • Avoid placing fluids in a dry-well. If fluids are required, use a Micro-Bath instead. • If...

Calibrating and Testing Thermocouple Sensors Thermocouples are common in industry because they are inexpensive and cover a wide temperature range. They should be tested during commissioning and again when removed from a process to verify that tolerances were met. Additionally, thermocouples may be tested at regular calibration intervals and when suspected of failing to meet their performance specifications. Often thermocouples need to be calibrated prior to use for mapping a temperature controlled enclosure, or they have to be calibrated for use as a temperature standard. Due to the unique...