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Calculation

The document reports on three experiments calibrating and evaluating a pressure transmitter (UUT). Experiment 1 compares the UUT's output to a digital manometer (MSU) using two methods, shown in graphs. Experiment 2 analyzes hysteresis by increasing and decreasing pressure. The results are shown in a table. Experiment 3 performs a five-point calibration of the UUT against the MSU and calculates output errors. Tables provide the calibration data and error calculations. The appendix further details the experimental procedures and results, and identifies potential errors and recommendations to improve accuracy.

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Tiger Rao
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144 views7 pages

Calculation

The document reports on three experiments calibrating and evaluating a pressure transmitter (UUT). Experiment 1 compares the UUT's output to a digital manometer (MSU) using two methods, shown in graphs. Experiment 2 analyzes hysteresis by increasing and decreasing pressure. The results are shown in a table. Experiment 3 performs a five-point calibration of the UUT against the MSU and calculates output errors. Tables provide the calibration data and error calculations. The appendix further details the experimental procedures and results, and identifies potential errors and recommendations to improve accuracy.

Uploaded by

Tiger Rao
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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Results

Experiment 1: Draft UUT Calibration of EJA430A Pressure Transmitter

Figure 1 shows the Graph of UUT vs MSU (METHOD 1)

UUT Vs MSU (Method 1)


250
200
150

UUT (mA)

100
50
0

50

100

150

MSU (kPa)

200

250

MSU Vs UUT (Method 2)


25
20
15

MSU (kPa)

10
5
0

50

100

150

200

250

UUT (mA)

Figure 2 shows the Graph of MSU vs UUT (METHOD 2)

Experiment 2: Determination of Hysteresis of the Pressure Measurement


Devices

MSU (kPa) Vs UUT (mA)


250
200
150

Increase

MSU

Decrease

100
50
0

10

12

14

16

18

20

22

UUT

Figure 3 shows the Graph of MSU vs UUT for both increasing and decreasing MSU
applied value.

Experiment 3: Five Point Calibration of Pressure Transmitters

UUT (mA) vs MSU (kPa)


25.00
20.00
15.00

UUT (mA)

10.00
5.00
0.00
0.00

50.00

100.00

150.00

200.00

250.00

MSU (kPa)
Desired UUT Output

Actual UUT Output

Figure 4 shows the Graph of UUT vs MSU for five-point calibration.

APPENDIX
Experiment 1: Draft UUT Calibration of EJA430A Pressure Transmitters
a) Calibration by Method I
UUT= EJA430A Pressure Transmitter Range 0-200kPa
MSU= Model 767355 Digital Manometer

No

Reading of kPa

Tolerance of kPa

1
2
3
4
5
6
7
8
9
10
11

0
20
40
60
80
100
120
140
160
180
200

0.15025
0.15025
0.15025
0.15025
0.15025
0.15025
0.15025
0.15025
0.15025
0.15025
0.15025

MSU reading (kPa)


1st
2nd
Average
0.03
0.03
0.03
20.03
20.03
20.03
40.03
40.03
40.03
60.03
60.03
60.03
80.03
80.03
80.03
100.03
100.03
100.03
120.03
120.03
120.03
140.03
140.03
140.03
160.03
160.03
160.03
180.03
180.03
180.03
200.03
200.03
200.03

Table 1 shows the Draft Calibration of EJA430A Pressure Transmitter by Method 1

b) Calibration by Method II
UUT= EJA430A Pressure Transmitter Range 0-200kPa
MSU= Model 767355 Digital Manometer
No.

MSU Value
(kPa)

1
2
3
4
5
6
7
8
9
10
11

0
20
40
60
80
100
120
140
160
180
200

Tolerance (mA)

UUT Output (mA)


1st
2nd
Average
0.00139
4.03
4.03
4.03
0.00057
5.63
5.63
5.63
0.00073
7.23
7.23
7.23
0.00089
8.83
8.83
8.83
0.00105
10.44
10.44
10.44
0.00121
12.04
12.04
12.04
0.00137
13.64
13.64
13.64
0.00153
15.24
15.24
15.24
0.00169
16.84
16.84
16.84
0.00185
18.45
18.45
18.45
0.002001
20.05
20.05
20.05

Table 2 shows the Draft Calibration of EJA430A Pressure Transmitter by Method 2

Experiment 2: Determination of Hysteresis of the Pressure Measurement


Devices
UUT = EJA430A Pressure Transmitter Range 0-200kPa
MSU = Model 767355 Digital Manometer
MSU Applied
Value kPa

UUT Output (mA)


Increase

Decrease

0
20
40
60
80
100
120
140
160
180
200

4.03
5.63
7.23
8.83
10.44
12.04
13.64
15.24
16.84
18.45
20.05

4.03
5.63
7.24
8.84
10.44
12.04
13.64
15.24
16.84
18.44
20.05

Table 3 shows Hysteresis in EJA430A Pressure Transmitter

Experiment 3: Five Point Calibration of Pressure Transmitters


No.

MSU Applied

0.00
2.50
5.00
7.50
10.00

0.00
50.00
100.00
150.00
200.00

Desired UUT
Output
4.00
8.00
12.00
16.00
20.00

Actual UUT
Output
4.03
8.03
12.04
16.04
20.05

Table 4 shows Graph of UUT vs MSU for five-point calibration.

Calculation

Output Error ( )=

Example:

Actual UUT Output ( mA )Desired UUT Output ( mA )


x 100
Desired UUT OUtput ( mA )

Output Error
(%)
0.75
0.37
0.33
0.25
0.25

mA
|4.03 mA4.004.00
|x 100
mA

Output Error ( )=

0.75%

ERRORS & RECOMMENDATION


Error
Human Error occurs during the process
adjusting the value of pressure for each
device. There are a few chances that
value is taken before steady state is
achieved.

Recommendation
Always make sure that the device has
reach its steady state before taking
values.

MSU and UUT reading have slight


different from the fixed value during
implementation of experiment due to
the surrounding effect.

Results can be improved by taking


reading 3 times for best average
reading.

Defection or instrumentation error may


occur when involving electronics
device.

Maintenance and check-up should be


done on regular basis to prevent any
defection that might occur.

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