1. Calibration PT Honeywell Chapter 7 InstrumentationELC-213Today Presentation by Clifford T. Johnson, PE, Control Systems Engineer Honeywell Primer Auxiliaries

2. What is Calibration? InstrumentationELC-213Calibration WHAT IS CALIBRATION? There are as many definitions of calibration as there are methods. According to ISA’s The Automation, Systems, and Instrumentation Dictionary,the word calibration is defined as “a test during which known values of measurand are applied to the transducer and corresponding output readings are recorded under specified conditions.” The definition includes the capability to adjust the instrument to zero and to set the desired span.

3. What are the Characteristics InstrumentationELC-213 WHAT ARE THE CHARACTERISTICS OF A CALIBRATION? Calibration Tolerance: Every calibration should be performed to a specified tolerance. The terms tolerance and accuracy are often used incorrectly. In ISA’s The Automation, Systems, and Instrumentation Dictionary, the definitions for each are as follows: Accuracy: The ratio of the error to the full scale output or the ratio of the error to the output, expressed in percent span or percent reading, respectively. Tolerance: Permissible deviation from a specified value; may be expressed in measurement units, percent of span, or percent of reading. Calibration

4. Why is it required InstrumentationELC-213 WHY IS CALIBRATION REQUIRED? Calibration is required for a new instrument because we want to make sure the instrument is providing accurate indication or output signal when it is installed. Instrument error can occur due to a variety of factors: drift, environment, electrical supply, addition of components to the output loop, process changes, etc. Calibration is performed by applying a known signal to the instrument under test. An error is the algebraic difference between the indication and the actual value of the measured variable. Calibration

5. Who performs calibration InstrumentationELC-213 WHO PERFORMS CALIBRATIONS? – THE CONTROL SYSTEM TECHNICIAN A (CST) is a skilled craftsperson who knows pneumatic, mechanical, and electrical instrumentation. He or she understands process control loops and process control systems, including those that are computer-based.. CST is a certification by the ISA (International Society for Automation). I am a certified instructor for the ISA and can proctor the test here at CPCC. Contact me for further information. NOTE: there is a charge for the Certification Test Calibration

6. The Tech InstrumentationELC-213 CHARACTERISTICS OF A CONTROL SYSTEM TECHNICIAN Honesty and Integrity Attention to Detail Excellent Documentation Practices Understanding of Processes Honesty and Integrity Attention to Detail Excellent Documentation Practices Understanding of Processes Calibration

7. Loop Calibration InstrumentationELC-213 LOOP CALIBRATION VS. INDIVIDUAL INSTRUMENT CALIBRATION An individual instrument calibration is performed only on one instrument. The input and output are disconnected. A known source is applied to the input, and the output is measured at various data points throughout the calibration range. The instrument is adjusted, if necessary, and calibration is checked and/or corrected DISADVANTAGES OF INDIVIDUAL CALIBRATION ADVANTAGES OF INDIVIDUAL CALIBRATION 1. Entire loop is not verified within tolerance 2. Mistakes on re-connect 3. Less efficient use of time to do one calibration for each loop instrument as opposed to one calibration for the loop 1. Correct instrument will be adjusted 2. More compatible with multifunction calibrators Calibration

8. Calibration Form for PT FormELC-213Calibration Use your Tag 40

9. Honeywell Chapter 7- Auxiliaries InstrumentationELC-213Honeywell

10. Record Rate of Flow InstrumentationELC-213Honeywell

11. Total Flow InstrumentationELC-213Honeywell

12. Linearization of flow rate InstrumentationELC-213 Why a Square Root Extractor is required? Because flow measured by dp is not linear. The formula describing this relationship is as follows: Q = K P Q = The quantity of flow K = A calibration constant that depends on the size of the restriction when compared to the inner pipe diameter, the maximum flow rate, and other non-changing parameters P = The differential pressure between the high pressure upstream side and the low pressure downstream side of the restriction. Honeywell

13. Square Root Extractor InstrumentationELC-213Honeywell

14. Mass Flow Loop InstrumentationELC-213Honeywell

15. Adder Subtractor InstrumentationELC-213Honeywell

16. Adder Subtractor Loop InstrumentationELC-213Honeywell

17. Calibration of final control devices: Valves, motors, Drives, Dampers, InstrumentationELC-213Honeywell Control valve

18. AssignmentELC-213 Homework ASSIGNMENT Web Link Send me a link to Calibration instructions for a Pressure Transmitter, The Download the calibration form for next weeks lab Email Ex: Johnson-PT Cal- Email Ex: Johnson-PT Cal- AD All Emails Subjects and File names must have Turn in Calibration sheet with 2 Students Names near bottom You will lose 1-3 points for incorrect subject Subjects Subject : Subject :Your last Name-Subject-Assignment Date (AD)

19. Cal of LTdpELC-213 The End End This is what you are to calibrate, a Rosemount 1151 dp transmitter previously used to measure the level in the receiver tank on the Flow Lab