CONFIDENTIAL CLB21103

BACHELOR IN CHEMICAL ENGINEERING TECHNOLOGY

TEST 1

SEPTEMBER SEMESTER 2014 16 OCTOBER 2014

COURSE CODE : CLB 21103

COURSE : PROCESS INSTRUMENTATION

DURATION : 1 HOUR

NAME :

ID NUMBER :

SPECIALIZATION :

INSTRUCTIONS TO CANDIDATES:

1. Answer ALL questions.

THIS QUESTION SHEET CONSISTS OF 3 PRINTED PAGES INCLUDING THIS PAGE. ATTENTION: DO NOT OPEN THIS BOOKLET UNTIL PERMISSIO N IS GIVEN TO DO SO.

UNIVERSITI KUALA LUMPUR

MALAYSIAN INSTITUTE OF CHEMICAL & BIOENGINEERING TECHNOLOGY

CONFIDENTIAL CLB21103

1

QUESTION 1

a) What is the pressure 35.0 m below the surface of a lake? Atmospheric pressure (the

pressure at the surface is 10.4 m H2O, and the density of water is 1000.0 kg/m3 (Assume

that g is 9.807m/s2).

(2 marks)

b) Define each term below:

i. Sensitivity

ii. Instrument

iii. Repeatability

iv. Accuracy

(4 marks)

c) Given the lowest value of measurement in pressure sensor transmitter is 35 psig

meanwhile the highest value is 60 psig. By referring to the statement, define and

determine the value of

i. Range of instrument

ii. Span of instrument

iii. Zero of instrument

(6 marks)

d) Label the following P & ID:

(5 marks)

(i)

(ii) (iii)

(iv)

(v)

CONFIDENTIAL CLB21103

2

QUESTION 2 Both transducers and transmitters convert energy from one form to another and give an output

signal. The signal is directed to any device that interprets it and uses it to display record or alter

the pressure in a system.

(a) Give 3 examples of transducer signal.

(3 marks)

(b) Data in Table 1 are obtained from calibration table of a pressure transmitter. By

using the theoretical output as the reference, determine the accuracy (E) and

deviation (F), followed by determining either the calibration are passed or failed (H).

A B C D E F G H

Input Pressure

Applied (psig at

% of Calibration

Range)

Output

Pressure

(psig)

Measured

Output

(mA)

Theoritical

Output

(mA)

% Accuracy

( 100 % Deviation

( 20 4 100 Dev.

Limit

Remarks

(Pass /

Fail)

7.50 at 25.0% 7.50 8.01 8.00 (i) (ii)

0.075 (iii)

15.00 at 50.00% 15.00 12.01 12.00 (iv) (v)

0.075 (vi)

22.50 at 22.5% 22.50 16.02 16.00 (vii) (viii)

0.075 (ix)

(9 marks) (c) Explain THREE (3) methods of pressure measurement maintenance.

(6 marks)

End of question paper