Exp 1 - Process Instrument

8/18/2019 Exp 1 - Process Instrument

1/8

SUMMARY

In this experiment, we use manometer, multimeter, a vacuum pump; a hand held

terminal, a hand pump, an absolute pressure transmitter , a pressure gauge and pressure

gauge transmitter as our device to measure the pressure. There are 2 experiments that had

been held, the first experiment is pressure measurement and the second is calibration

check.

For the first experiment we have to run seven times to get the reading. For the

first run the suggest pressure is 3 psig, and then 2! psig, 2 psig, "! psig, " psig, ! psig

and lastl# psig. The value of the actual gauge pressure several differences with the

suggested pressure because of the human error and using wrong techni$ue when handle

the devices

INTRODUCTION

This %odel &%' 2 plant is a scaled(down real industr# process plant built on

!ft x !ft steel platform, complete with its own dedicated control panel. The process

e$uipment and process instrumentation are real industrial process t#pe. The plant is

constructed in accordance to industrial process plant standards and practices, with fail(

safe features.

OBJECTIVES

The ob)ective of the experiment was to evaluate and stud# measurement of

pressure * +bsolute &ressure Transmitter &T"-,auge &ressure Transmitter &T2- and

&ressure auge &- / and To check the site calibration of the above pressure measuring

instruments * 0and &ump, 1acuum &ump, %anometer, %ultimeter, 0and 0eld Terminal

to configurecalibrate &T", &T2


2/8

RESULTS

TABLE 1

RUN I SET 1 SET 2 AVERAGE+ uggested &ressure, psig 3. 3. 3.

4 +ctual auge &ressure, psig 3."! 3."" 3."3

' auge &ressure, psig 3. 3. 3.

5 auge &ressure, psig 26.3 3." 26.7

8 +bsolute &ressure, psia 93.: 99.! 99."!

F4:

RUN I I SET 1 SET 2 AVERAGE

+ uggested &ressure, psig 2!. 2!. 2!.

4 +ctual auge &ressure, psig 2!.2: 2!.7 2!.96' auge &ressure, psig 2!. 2!. 2!.

5 auge &ressure, psig 2!.3 2!.: 2!.!!

8 +bsolute &ressure, psia 36.: 9.2 9.

F42 I4 = 5I +t &ressure

Indicator,

&"2

0 IF ( 8I +bsolute &ressure5eviation, psia

.": .2 ."6


3/8

RUN I I I SET 1 SET 2 AVERAGE

+ uggested &ressure, psig 2. 2. 2.

4 +ctual auge &ressure, psig 2.9 2.2> 2.33

' auge &ressure, psig 2. 2. 2.

5 auge &ressure, psig 2. 2." 2."

8 +bsolute &ressure, psia 39.9 39.9 39.9F4 3!.3

" I4 = 'I auge

&ressure

5eviation, psig

+t &ressure

auge .9

.9

.2>

.">

.33

.2:2 I4 = 5I +t &ressure

Indicator,

&"2

0 IF ( 8I +bsolute &ressure

5eviation, psia

.7 .!> .>3

RUN IV SET 1 SET 2 AVERAGE

+ uggested &ressure, psig "!. "!. "!.

4 +ctual auge &ressure, psig "9.!6 "!.33 "9.6>

' auge &ressure, psig "!. "!. "!.

5 auge &ressure, psig "!.9 "!.9 "!.!

8 +bsolute &ressure, psia 26." 26.: 26.!

F4


4/8

RUN V SET 1 SET 2 AVERAGE

+ uggested &ressure, psig ". ". ".

4 +ctual auge &ressure, psig ".2 !.7! 7.:6

' auge &ressure, psig ". ". ".

5 auge &ressure, psig ".2 6.6 ".!

8 +bsolute &ressure, psia 29.7 29.3 29.!F4

.26

.""

."!

.26

2 I4 = 5I +t &ressure

Indicator,&"2

0 IF ( 8I +bsolute &ressure5eviation, psia

.9 ."6 ."2


5/8

RUN VII SET 1 SET 2 AVERAGE

+ uggested &ressure, psig . . .

4 +ctual auge &ressure, psig .: .96 .26

' auge &ressure, psig . . .

5 auge &ressure, psig .2 .> .9

8 +bsolute &ressure, psia "9.> "!. "9.:F4


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TABLE 3: PT2 SITE CALIBRATION CHECK

RUN I PT2 Site Cali!ati"#

P!"$%&t C"$e: '2(EAE21)2)G1111

Se!ial N%*e!: +))3)),1(3

Ma-i*%* $e.iati"# : )/),+ 0e!" I#i/ E!! )/)3

Ta4 Na*e: PTI 0) 5 ')PSIA

Cali!ati"# Ra#4e: (/3+ 6 7,

A B C D E 8 G H

I#9%t

P!e%!e A99lie$;

9i4

at< "= Cali!ati"#

Ra#4e

O%t9%t

P!e%!e;

9i4

Mea%!e$

O%t9%t;

*A

T>e"!eti&al

O%t9%t; *A

< A&&%!a&?

( )

m+

5

D

mAC − x "

< De.iati"#

( )

( )"x

9(2

m+5

mA

C −

De./

Li*it

Re*a!@

&ass? If 5eviation @ A

5ev. Cimit

Fail ? If Dtherwise

("2.2:2.92 at 9.3@ ( ( 9. ( ( .3 6

.3"!. at 2!.@ "9.: :. :. . . B .7! Pa

"!.33. at !.@ 3." "2. "2. . . B .7! Pa

3.39!. at 22.!@ 9!.2 ">. ">. . . B .7! Pa

9!.3>. at ".@ !6.6 2. 2. . . B .7! Pa


7/8

DISCUSSION

From Table ", we can see clearl# the average different between psia and psig is

around "9.7 psia even though we do with the different suggested pressure. This is because

of the value of atmosphere is constant "9.7 psia. Then the value that we obtained is notver# accurate because of the error, such as manufacturing tolerance, signal conditioning

and displa# resolution. The important term that related the sensor and transmitter range of

instrument low and high value range-, span of instrument different high(low- and Eero

of the instrument low value-.

In this experiment we used a %anometer, a 0and &ump, %ultimeter and a 0and

0eld Terminal as the devices to check the calibration of the pressure measuring

instruments. It is to evaluate of pressure using +n +bsolute Transmitter &T"- and +n

&ressure auge &-. In our experiment, there is a different value between actual gauge

pressure and the gauge pressure reading from the measurement device. It could be cause

b# the unstable pressure while the reading is taken. The readings of the hand pump were

difficult to get because the pressure were not static therefore we have to be ver# alert to

get an accurate reading

CONCLUSION

4ased on experiment we have conclude that how to evaluate and stud#

measurement of pressure using the following +n +bsolute &ressure Transmitter, + auge

&ressure transmitter and + &ressure auge. This experiment re$uire us how to use

electronic and mechanical instrument to measure the pressure. e can conclude that the

reading at pressure gauge and pressure indicator have the deviation. &ressure indicator

gives accurate reading than others.

4esides that, this experiment need us to check the site calibration of the above

pressure measuring instrument using the following + 0and &ump, + 1acuum &ump,

%anometer, %ultimeter , and + 0and 0eld Terminal.


8/8

TUTORIAL

1/ State >et>e! t>e 9!e%!e i >i4>e!l"e!e%al at t>e "tt"* "= t>e ta#@ =ille$

it> a 4a t>a# at t>e t"9/

The pressure is e$ual at the bottom of the tank filled with a gas than at the top because a gas can be compressed or expanded to fit almost an# volume.

2/ I= t>e &"#te#t "= a ta#@ >"l$i#4 ()*3 "= 4a a!e t!a#=e!!e$ t" a ta#@ it> ti&e a

*%&> ."l%*e a#$ all "t>e! =a&t"! !e*ai# %#&>a#4e$; >at ill >a99e# t" 4a

9!e%!e

hen the value of the volume is decrease, the pressure is also decrease. hen the value

of the volume is increase, the pressure is increase while the other factors remain

unchanged. Therefore, doubling the volume of a gas cuts the pressure in half.

3/ I= t>e 4a i# a ta#@ >eate$ a#$ all "t>e! =a&t"! !e*ai# %#&>a#4e$; >at ill

>a99e# t" t>e 4a 9!e%!e

If the gas in a tank heated and all other factors remain unchanged the gas pressure will

become high and increase. This is because when the heat is transferred from fire to the

tank it makes the atoms or molecules move activel# and directl# proportional to the

temperature.

(/ >at a!e t>e 9!e%!e *ea%!i#4 i#t!%*e#t %e$ i# t>i 9la#t

The pressure measuring instruments used in this plant are; a %anometer +%8T8G

HDF+ '&'(2 IJ5-, a %ultimeter %D58C 5%(36"+-, a pressure

indicator and a pressure gauge.

+/ Di&% !ie=l? t>e 9"ile e!!"! a==e&ti#4 t>e a&&%!a&? i# 9!e%!e *ea%!e*e#t

a "e!.e$ i# t>e e-9e!i*e#t/

• e did not control pressureslow down the valve properl# and affect the pressure

reading.

• 'areless.

• The e$uipment is not working properl#.

Exp 1 - Process Instrument

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