44eBook PSP | Process Control & Instrumentation Connections Table 3.6 ISA Symbols for Connections Symbol Connection Piping Connection to Instruments Electrical Signals Pneumatic Signals Data Links Capillary Tubing Hydraulic Signals Electromagnetic or Sonic Signals
eBook PSP | Process Control & Instrumentation 45 Identification Letters Table 3.7 ISA Symbols for Identification Letters Symbol Instrument Flow Indicating Controller Square Root Calculation Pressure Indicating Controller Square Root Calculation Temperature Indicating Controller Square Root Calculation Level Indicating Controller Square Root Calculation Flow Transmitter Pressure Transmitter Temperature Transmitter Level Transmitter
46 eBook PSP | Process Control & Instrumentation SELF ASSESSMENT Question 1. The function of a _____________ is to convert a reading from a sensor into a standard signal to be transmitted to a controller. A. Indicator B. Transmitter C. Gauges D. Transmitter Question 2. The most common analogue signal range that is used in process control is _____________. A. 8-16 mA B. 4-20 mA C. 6-12 mA D. 5-10 mA Question 3 The most common pneumatic signal range that is used in process control is _____________. A. 4-12 psig B. 5-10 psig C. 2-8 psig D. 3-15 psig
eBook PSP | Process Control & Instrumentation 47 Question 4 What device is used to read the temperature of a process fluid? A. Actuator B. Final Control Element C. Indicator D. Controller Question 5 What part of the process control system that physically changes the manipulated variable? A. Transducer B. Gauge C. Final Control Element D. Controller Question 6 Which device records the outputs of measurement devices? A. Sensors B. Controllers C. Recorders D. Actuator Question 7 Which device actuates the final control element when it receives a signal from the controller? A. Actuator B. Transducer C. Controller D. Indicator
48 eBook PSP | Process Control & Instrumentation Question 8 What device receives feedback from sensors, compares the data with the setpoint and sends a signal to the final control element to perform corrective action? A. Feedback Element B. Actuator C. Transmitter D. Controller Question 9 Identify the following ISA symbols. a) b) c) d) e) PIC 123 123 TT 123 PIC
eBook PSP | Process Control & Instrumentation 49 ANSWER: 1. B 2. B 3. D 4. C 5. C 6. C 7. A 8. D Question 9 a) PLC b) Pneumatic Valve c) Manual Valve d) Temperature Transmitter e) Pressure Indicating Controller
50 eBook PSP | Process Control & Instrumentation Reference Franklyn, W. K., Thomas A.W. and Philip K. (2019). Instrumentation and Process Control .7th Edition. American Technical Publishers. Bolton, W. (2019). Mechatronics: Electronic Control Systems in Mechanical and Electrical Engineering, 8th Edition. Pearson (India). Dunn, W. (2018). Fundamentals of Industrial Instrumentation and Process Control. 2nd Edition. McGraw Hill.
POLITEKNIK SEBERANG PERAI JALAN PERMATANG PAUH 13500 PERMATANG PAUH PULAU PINANG http://www.psp.edu.my